阅读说明：本技术 一种燃具火盖表面搪瓷工艺 (Enamel technology for surface of burner cap ) 是由 刘新 魏长富 于 2020-10-28 设计创作，主要内容包括：本发明提供一种燃具火盖表面搪瓷工艺,包括如下步骤：S1.按如下原料配制釉料；氧化镍、矾土、氧化钴、氧化钠、硼砂、亚硝酸钠、粘土、石英粉、钴黑、镍和水；S2.将上述原料混合球磨后得釉浆；S3.火盖坯件表面打砂；S4.火盖坯件表面中和水洗；S5.火盖表面喷S2获得的釉浆,然后烘干,烧结,冷却。本发明通过釉料配方及工艺的结合,获得具有优异的仿真度的大理石瓷砖。本发明从釉浆原料进行选择优化,并且配合改良的搪瓷工艺,解决了燃烧灶具表面易腐蚀生锈问题,燃烧灶具火盖表面膜厚均匀致密,更为美观,燃烧过程中不会对环境产生污染,同时解决了燃烧过程中涂层脱落等问题。(The invention provides an enamel process for the surface of a burner fire cover, which comprises the following steps: s1, preparing glaze according to the following raw materials; nickel oxide, alumina, cobalt oxide, sodium oxide, borax, sodium nitrite, clay, quartz powder, cobalt black, nickel and water; s2, mixing the raw materials and performing ball milling to obtain glaze slurry; s3, sanding is performed on the surface of the fire cover blank; s4, neutralizing and washing the surface of the fire cover blank; and S5, spraying the glaze slurry obtained in the step S2 on the surface of the fire cover, and then drying, sintering and cooling. The invention obtains the marble ceramic tile with excellent simulation degree by combining the glaze formula and the process. The invention selects and optimizes the glaze slip raw materials, and solves the problem that the surface of the combustion cooker is easy to corrode and rust by matching with the improved enamel process, the surface of the fire cover of the combustion cooker has uniform and compact film thickness and is more beautiful, the environment is not polluted in the combustion process, and the problems of coating falling off and the like in the combustion process are solved.)

1. The enamel process for the surface of the fire cover of the burner is characterized by comprising the following steps:

s1, preparing a glaze material from the following raw materials in parts by weight:

s2, mixing the raw materials and performing ball milling to obtain glaze slurry;

s3, removing oil from the fire cover blank at high temperature;

s4, performing shot blasting and sand blasting on the surface of the fire cover blank;

s5, neutralizing and washing the surface of the fire cover blank;

s6, spraying the glaze slurry obtained in the step S2 on the surface of the fire cover, and then drying, sintering and cooling.

2. The enameling process for the surface of a burner cap according to claim 1, wherein the high-temperature degreasing operation of the fire cap blank of S3: and opening a deoiling switch of the high-temperature furnace, raising the temperature of the high-temperature furnace to 500-800 ℃, deoiling for 7-10min, controlling the rotating speed parameter of a motor of the high-temperature furnace to be 400-700r/min, and placing the fire cover blank on a transmission line of the high-temperature furnace for high-temperature deoiling.

3. The enameling process for the surface of the fire cover of a burner according to claim 1, wherein the shot blasting and sand blasting of S4 are performed by using brown corundum emery of 0.6-0.8 mm; the diameter of the fire cover is less than 75mm, 1400-1600 pcs are placed each time, and 5min of shot blasting and sand blasting is carried out; the diameter of the fire cover is 75 mm-130 mm, 900-1100 pcs are placed each time, and shot blasting and sand blasting are carried out for 6 min; the diameter of the fire cover is larger than 130mm, 600 to 800pcs are placed each time, and shot blasting and sand blasting are carried out for 6 min.

4. The enameling process for the surface of the burner fire cover of claim 1, wherein the neutralization water washing of S5 adopts a solvent formula as follows: 100g of normal temperature tap water, 0.5-0.8g of sodium carbonate, 0.6-1.0g of sodium nitrite and 0.5-0.7g of borax.

5. The process of enameling the surface of a burner cap according to claim 1, wherein in S6, the glaze slurry is diluted to a diluted concentration of 1.65-1.70:1.0 water, and sprayed by a spray gun device with an air pressure of 0.6-0.8Pa adjusted to improve the powder application rate of enamel powder; and adjusting the spraying track of the spray gun equipment to achieve an overlapped spraying effect for improving the spraying effect, wherein the front side of the fire cover blank is sprayed for 5-8 times, and the back side of the fire cover blank is sprayed for 3-4 times.

6. The enameling process for the surface of a burner cap according to claim 1, wherein the ball milling operation in S2: after mixing the solid raw materials, adding ball stones with the weight 1.1-1.2 times of the total weight of the solid raw materials, adding water with the weight 0.4-0.5 time of the total weight of the solid raw materials, performing ball milling at the rotating speed of 1000-1300 r/min for 240-300 min, and enabling the glaze slurry to pass through a 60-80-mesh stainless steel screen after ball milling, wherein the fineness of the glaze slurry is 100%; the ball stone is 40mm ball stone and 60mm ball stone according to the weight ratio of 1: 1 is configured.

7. The process of enameling the surface of the burner fire cover according to claim 1, wherein in S6, the drying temperature for drying the fire cover is 100-120 ℃, and the sintering temperature for sintering the fire cover is 780-820 ℃.

8. The enameling process for the surface of the fire cover of the burner as recited in claim 1, wherein in S1, the glaze is prepared from the following raw materials in parts by weight:

9. the process for enameling the surface of the burner cap according to claim 1, wherein the burner cap is made of iron or iron alloy.

10. Use of the process for enamelling the surface of burner caps according to any of claims 1 to 9 in the manufacture of burner caps.

Technical Field

The invention belongs to the field of surface enamel of metal products, and particularly relates to an enamel process for the surface of a burner cap of a burner.

Background

Enamel, also known as enamel, is a composite material in which an inorganic vitreous material is fused to a base metal and is firmly bonded to the metal. The enamel is inorganic glass enamel coated on the surface of a metal base blank. The enamel coating on the metal surface can prevent the metal from rusting, so that the metal can not form an oxide layer on the surface when being heated and can resist the corrosion of various liquids. The enamel has high hardness, high temperature resistance, wear resistance, insulating effect and other excellent performance on the metal blank, so that the enamel product has wider application. The enamel coating can react with the metal matrix to form chemical combination of the interface in the sintering preparation process, the interface peeling resistance of the coating under the thermal cycle condition is superior to that of the traditional ceramic coating, and the enamel coating has excellent oxygen diffusion resistance and high-temperature oxidation resistance superior to that of the traditional metal coating, so the enamel coating is widely applied to combustion appliance devices.

According to the existing method for enameling the surface of a burner, a blank body is required to be enameled by using glaze slurry according to production requirements, glaze powder or the glaze slurry is uniformly coated on a metal blank, and surface glaze is coated after the blank is fired. The enameling method includes dipping, casting, spraying, powder spraying and the like. The powder spraying method is to spray dry surface glaze powder on a glowing ground coat to make enameling and roasting combined into one operation, and is also a common method for large cast iron parts. In addition, electrostatic coating, electrophoretic enameling, and the like are also available. After the enameling is finished, drying the moisture in the glazing slurry of the blank, and then firing. In the prior art, the quality of the coating is difficult to control in the whole operation process of processing the enamel surface coating, the defects of low adhesion, easy falling off, uneven film thickness, poor combustion resistance, easy corrosion and the like of the coating can exist, and the specific requirements of processing are not met.

Disclosure of Invention

The invention aims to provide an enamel process for the surface of a fire cover of a combustion appliance, which is characterized in that the enamel process is selected and optimized from glaze slip raw materials and is matched with an improved enamel process, so that the problem that the surface of the combustion appliance is easy to corrode and rust is solved, the surface of the fire cover of the combustion appliance is uniform and compact in film thickness and more attractive, no pollution is caused to the environment in the combustion process, and the problems of coating falling off and the like in the combustion process are solved.

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

an enamel process for the surface of a fire cover of a burner comprises the following steps:

s1, preparing a glaze material from the following raw materials in parts by weight:

s2, mixing the raw materials and performing ball milling to obtain glaze slurry;

s3, removing oil from the fire cover blank at high temperature;

s4, performing shot blasting and sand blasting on the surface of the fire cover blank;

s5, neutralizing and washing the surface of the fire cover blank;

s6, spraying the glaze slurry obtained in the step S2 on the surface of the fire cover, and then drying, sintering and cooling.

According to the invention, firstly, the raw material of the glaze is mainly selected from nickel base, and high-temperature resistant raw materials such as alumina, clay, quartz powder and the like are added, and the alumina, the clay and the quartz powder are matched with each other after the dosage is adjusted according to the textures and the firing conditions of the alumina, the clay and the quartz powder, so that the surface of the glaze slip after firing is more uniform and compact. The content of cobalt oxide and cobalt black is optimized, the Co and Ni contained in the glaze material reduce the difference between the expansion coefficient of the metal substrate and the expansion coefficient of the enamel layer, and simultaneously, the surface of the enamel layer is properly coarsened, so that the adhesion of the enamel layer and the metal substrate is improved. So that the adhesion of the metal substrate to the enamel layer is high. The invention enables to improve the resistance to sulphuric acid and to acid dew point corrosion compared to the previous enamelled products. Secondly, the surface of the substrate is treated, oil is removed at high temperature, sanding and surface cleaning are carried out, so that the surface roughness of the metal substrate is suitable, the bonding strength with the glaze is high, and finally, the glaze spraying mode is adopted, so that the uniform coverage of the glaze slurry can be well controlled and adjusted. The enamel process is simple and the quality is controllable.

In the present invention, preferably, the fire lid blank high temperature degreasing operation of S3: and opening a deoiling switch of the high-temperature furnace, raising the temperature of the high-temperature furnace to 500-800 ℃, deoiling for 7-10min, controlling the rotating speed parameter of a motor of the high-temperature furnace to be 400-700r/min, and placing the fire cover blank on a transmission line of the high-temperature furnace for high-temperature deoiling.

In the invention, preferably, the shot blasting and sand blasting of S4 adopts brown corundum emery with the thickness of 0.6-0.8 mm; the diameter of the fire cover is less than 75mm, 1400-1600 pcs are placed each time, and 5min of shot blasting and sand blasting is carried out; the diameter of the fire cover is 75 mm-130 mm, 900-1100 pcs are placed each time, and shot blasting and sand blasting are carried out for 6 min; the diameter of the fire cover is larger than 130mm, 600 to 800pcs are placed each time, and shot blasting and sand blasting are carried out for 6 min. The brown corundum carborundum with the thickness of 0.6-0.8mm is selected, the surface sand blasting effect of the iron base material is better controlled, and the surface roughness after sand blasting is suitable for being adhered to glaze.

In the present invention, preferably, the solvent formula adopted in the neutralization water washing in S5 is: 100g of normal temperature tap water, 0.5-0.8g of sodium carbonate, 0.6-1.0g of sodium nitrite and 0.5-0.7g of borax. Cleaning the surface to remove impurities and dirt.

In the invention, in S6, specifically, the glaze slurry is diluted to the dilution concentration of 1.65-1.70:1.0 water, spray gun equipment is adopted for spraying, and the air pressure of the spray gun equipment is adjusted to 0.6-0.8Pa for improving the powder coating rate of the enamel powder; and adjusting the spraying track of the spray gun equipment to achieve an overlapped spraying effect for improving the spraying effect, wherein the front side of the fire cover blank is sprayed for 5-8 times, and the back side of the fire cover blank is sprayed for 3-4 times. The lance equipment may be lance equipment conventionally used in the art, and the present invention is not limited thereto.

In the present invention, preferably, the ball milling operation in S2: after mixing the solid raw materials, adding ball stones with the weight 1.1-1.2 times of the total weight of the solid raw materials, adding water with the weight 0.4-0.5 time of the total weight of the solid raw materials, performing ball milling at the rotating speed of 1000-1300 r/min for 240-300 min, and enabling the glaze slurry to pass through a 60-80-mesh stainless steel screen after ball milling, wherein the fineness of the glaze slurry is 100%; the ball stones with the diameter of 40mm and the ball stones with the diameter of 60mm are arranged according to the weight ratio of 1: 1 is configured. The fineness of the glaze slip has a great influence on the performance of the final glaze layer. The glaze material is crushed to be too fine, so that the glaze slip has too large viscosity and too much water content, and the glaze surface is easy to crack in the firing process, and the glaze layer is lifted to be separated from the matrix. However, if the glaze is not sufficiently crushed, the adhesion of the glaze slip is too low, and the components in the glaze are liable to settle. And the adhesion of the glaze layer to the substrate is weak.

In the invention, preferably, the drying temperature for drying the fire cover at S6 is 100-120 ℃, and the sintering temperature for sintering the fire cover is 780-820 ℃. The drying temperature of the fire cover reduces the moisture of the glaze on the surface, and then the sintering temperature is set according to each component in the glaze, so that the sintered glaze layer is uniform and fine and has no holes.

In the present invention, preferably, the glaze is prepared in S1 by the following raw materials in parts by weight:

the content ratio of the raw materials is summarized by long-term research and test findings of the inventor, and a glaze layer finally fired by the glaze material has high bonding strength, uniform and fine surface, difficult corrosion, high temperature resistance and optimal effect.

Specifically, the material of the burner cap is iron or iron alloy.

The invention has the beneficial effects that:

according to the invention, firstly, the raw material of the glaze is mainly selected from nickel base, and high-temperature resistant raw materials such as alumina, clay, quartz powder and the like are added, and the alumina, the clay and the quartz powder are matched with each other after the dosage is adjusted according to the textures and the firing conditions of the alumina, the clay and the quartz powder, so that the surface of the glaze slip after firing is more uniform and compact. The content of cobalt oxide and cobalt black is optimized, the Co and Ni contained in the glaze material reduce the difference between the expansion coefficient of the metal substrate and the expansion coefficient of the enamel layer, and simultaneously, the surface of the enamel layer is properly coarsened, so that the adhesion of the enamel layer and the metal substrate is improved. So that the adhesion of the metal substrate to the enamel layer is high. The invention enables to improve the resistance to sulphuric acid and to acid dew point corrosion compared to the previous enamelled products. Secondly, the surface of the substrate is treated, sanding and surface cleaning are carried out, so that the surface roughness of the metal substrate is suitable, the bonding strength with the glaze is high, and finally, the glaze spraying mode is adopted, so that the uniform coverage of the glaze slurry can be well controlled and adjusted. The enamel has simple process and controllable quality, and meets the requirements of European Union ROHS instruction and REACH regulation.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments, but the scope of the present invention is not limited to the embodiments.

The starting materials used in the following examples are all commercially available unless otherwise specified.

Example 1:

enamel is prepared on the surface of the burner cap, and the burner cap is made of iron; the method comprises the following steps:

s1, preparing a glaze material from the following raw materials:

s2, mixing the raw materials and performing ball milling to obtain glaze slurry;

100kg of the solid raw material mixture is filled, 120kg of ball stones (40mm ball stones and 60mm ball stones are arranged according to a ratio of 1: 1) are prepared, and 50kg of water is added; and locking the cover of the ball mill, starting the ball mill to perform ball milling for 300min at the rotating speed of 1000r/min, and sieving the glaze slip with a stainless steel mesh sieve with the fineness of 100 percent and the mesh size of 60-80 after ball milling.

And S3, removing oil from the fire cover blank at high temperature, opening an oil removing switch of the high-temperature furnace, heating the high-temperature furnace to 550 ℃, removing oil for 10min, controlling the rotating speed parameter of a motor of the high-temperature furnace at 450r/min, and placing the fire cover blank on a transmission line of the high-temperature furnace for high-temperature oil removal.

S4, performing shot blasting and sand blasting on the surface of the fire cover blank, wherein brown corundum carborundum with the thickness of 0.6-0.8mm is adopted for the shot blasting and sand blasting; the diameter of the fire cover is less than 75mm, 1600pcs are placed each time, and shot blasting and sand blasting are carried out for 5 min; the diameter of the fire cover is 75 mm-130 mm, 1100pcs are put into the fire cover each time, and the shot blasting and sand blasting are carried out for 6 min; the diameter of the fire cover is larger than 130mm, 800pcs are placed each time, and shot blasting and sand blasting are carried out for 6 min.

S5, neutralizing and washing the surface of the fire cover blank; the solvent formula adopted by the neutralization water washing is as follows: 100Kg of normal temperature tap water, 0.5Kg of soda ash, 0.6Kg of sodium nitrite and 0.5Kg of borax.

And S6, spraying glaze on the surface of the fire cover, drying, sintering and cooling. Diluting the glaze slip, wherein the dilution concentration is that the glaze slip is 1.65: 1.0, spraying by using a spray gun device, and adjusting the air pressure of the spray gun device to be 0.6-0.8Pa for improving the powder feeding rate of the enamel powder; and adjusting the spraying track of the spray gun equipment to achieve an overlapped spraying effect for improving the spraying effect, wherein the front side of the fire cover blank is sprayed for 5-8 times, and the back side of the fire cover blank is sprayed for 3-4 times. The drying temperature for drying the fire cover is 100 ℃, the time is 30min, and the sintering temperature for sintering the fire cover is 780 ℃, and the time is 10 min.

Thickness of glaze layer in this example: the front surface is 60-150 um; the back surface is 60-100 um.

Example 2:

enamel is prepared on the surface of the burner cap, and the burner cap is made of iron; the method comprises the following steps:

s1, preparing a glaze material from the following raw materials:

s2, mixing the raw materials and performing ball milling to obtain glaze slurry;

100kg of the solid raw material mixture is filled, 115kg of ball stones (40mm ball stones and 60mm ball stones are arranged according to a ratio of 1: 1) are prepared, and 50kg of water is added; and locking the cover of the ball mill, starting the ball mill to perform ball milling for 290min at the rotating speed of 1050r/min, and sieving the glaze slip with a stainless steel mesh screen material with the fineness of 100 percent and the mesh size of 60-80 after ball milling.

And S3, removing oil from the fire cover blank at high temperature, opening an oil removing switch of the high-temperature furnace, heating the high-temperature furnace to 600 ℃, removing oil for 9min, controlling the rotating speed parameter of a motor of the high-temperature furnace at 500r/min, and placing the fire cover blank on a transmission line of the high-temperature furnace for high-temperature oil removal.

S4, performing shot blasting and sand blasting on the surface of the fire cover blank; the shot blasting and sand blasting adopt brown corundum carborundum of 0.6-0.8 mm; the diameter of the fire cover is less than 75mm, 1600pcs are placed each time, and shot blasting and sand blasting are carried out for 5 min; the diameter of the fire cover is 75 mm-130 mm, 1100pcs are put into the fire cover each time, and the shot blasting and sand blasting are carried out for 6 min; the diameter of the fire cover is larger than 130mm, 800pcs are placed each time, and shot blasting and sand blasting are carried out for 6 min.

S5, neutralizing and washing the surface of the fire cover blank; the solvent formula adopted by the neutralization water washing is as follows: 100Kg of normal temperature tap water, 0.8Kg of soda ash, 1.0Kg of sodium nitrite and 0.7Kg of borax.

And S6, spraying glaze on the surface of the fire cover, drying, sintering and cooling. Diluting the glaze slip with water at a ratio of 1.66:1.0, spraying by using a spray gun device, and adjusting the air pressure of the spray gun device to be 0.6-0.8Pa for improving the powder coating rate of the enamel powder; and adjusting the spraying track of the spray gun equipment to achieve an overlapped spraying effect for improving the spraying effect, wherein the front side of the fire cover blank is sprayed for 5-8 times, and the back side of the fire cover blank is sprayed for 3-4 times. The drying temperature for drying the fire cover is 105 ℃, the time is 28min, the sintering temperature for sintering the fire cover is 790 ℃, and the time is 9.5 min.

Thickness of glaze layer in this example: the front surface is 60-150 um; the back surface is 60-100 um.

Example 3:

enamel is prepared on the surface of the burner cap, and the burner cap is made of iron alloy; the method comprises the following steps:

s1, preparing a glaze material from the following raw materials:

s2, mixing the raw materials and performing ball milling to obtain glaze slurry;

100kg of the solid raw material mixture is filled, 110kg of ball stones (40mm ball stones and 60mm ball stones are arranged according to a ratio of 1: 1) are prepared, and 50kg of water is added; and locking the cover of the ball mill, starting the ball mill to perform ball milling for 280min at the rotating speed of 1100r/min, and sieving the glaze slip with a stainless steel mesh sieve with the fineness of 100 percent and the mesh of 60-80 after ball milling.

And S3, removing oil from the fire cover blank at high temperature, opening an oil removing switch of the high-temperature furnace, heating the high-temperature furnace to 650 ℃, removing oil for 8min, controlling the rotating speed parameter of a motor of the high-temperature furnace to be 550r/min, and placing the fire cover blank on a transmission line of the high-temperature furnace for high-temperature oil removal.

S4, performing shot blasting and sand blasting on the surface of the fire cover blank; the shot blasting and sand blasting adopt brown corundum carborundum of 0.6-0.8 mm; the diameter of the fire cover is less than 75mm, 1600pcs are placed each time, and shot blasting and sand blasting are carried out for 5 min; the diameter of the fire cover is 75 mm-130 mm, 1100pcs are put into the fire cover each time, and the shot blasting and sand blasting are carried out for 6 min; the diameter of the fire cover is larger than 130mm, 800pcs are placed each time, and shot blasting and sand blasting are carried out for 6 min.

S5, neutralizing and washing the surface of the fire cover blank; the solvent formula adopted by the neutralization water washing is as follows: 100Kg of normal temperature tap water, 0.7Kg of soda ash, 0.8Kg of sodium nitrite and 0.6Kg of borax.

And S6, spraying glaze on the surface of the fire cover, drying, sintering and cooling. Diluting the glaze slip with water of 1.67:1.0, spraying by using a spray gun device, and adjusting the air pressure of the spray gun device to be 0.6-0.8Pa for improving the powder coating rate of the enamel powder; and adjusting the spraying track of the spray gun equipment to achieve an overlapped spraying effect for improving the spraying effect, wherein the front side of the fire cover blank is sprayed for 5-8 times, and the back side of the fire cover blank is sprayed for 3-4 times. The drying temperature for drying the fire cover is 110 ℃ for 27min, and the sintering temperature for sintering the fire cover is 800 ℃ for 8.5 min.

Thickness of glaze layer in this example: the front surface is 60-150 um; the back surface is 60-100 um.

Example 4:

enamel is prepared on the surface of the burner cap, and the burner cap is made of iron alloy; the method comprises the following steps:

s1, preparing a glaze material from the following raw materials:

s2, mixing the raw materials and performing ball milling to obtain glaze slurry;

100kg of the solid raw material mixture is filled, 110kg of ball stones (40mm ball stones and 60mm ball stones are arranged according to a ratio of 1: 1) are prepared, and 45kg of water is added; and locking the cover of the ball mill, starting the ball mill to perform ball milling for 270min at the rotating speed of 1150r/min, and sieving the glaze slurry with a 60-80-mesh stainless steel net after ball milling, wherein the fineness of the glaze slurry is 100%.

And S3, removing oil from the fire cover blank at high temperature, opening an oil removing switch of the high-temperature furnace, heating the high-temperature furnace to 700 ℃, removing oil for 7min, controlling the rotating speed parameter of a motor of the high-temperature furnace to be 600r/min, and placing the fire cover blank on a transmission line of the high-temperature furnace for high-temperature oil removal.

S4, performing shot blasting and sand blasting on the surface of the fire cover blank; the shot blasting and sand blasting adopt brown corundum carborundum of 0.6-0.8 mm; the diameter of the fire cover is less than 75mm, 1500pcs are put into the fire cover each time, and shot blasting and sand blasting are carried out for 5 min; the diameter of the fire cover is 75 mm-130 mm, 1000pcs are placed each time, and shot blasting and sand blasting are carried out for 6 min; the diameter of the fire cover is larger than 130mm, 700pcs is placed each time, and shot blasting and sand blasting are carried out for 6 min.

S5, neutralizing and washing the surface of the fire cover blank; the solvent formula adopted by the neutralization water washing is as follows: 100Kg of normal temperature tap water, 0.6Kg of soda ash, 0.9Kg of sodium nitrite and 0.7Kg of borax.

And S6, spraying glaze on the surface of the fire cover, drying, sintering and cooling. Diluting the glaze slip with water at a ratio of 1.68:1.0, spraying by using a spray gun device, and adjusting the air pressure of the spray gun device to be 0.6-0.8Pa for improving the powder coating rate of the enamel powder; and adjusting the spraying track of the spray gun equipment to achieve an overlapped spraying effect for improving the spraying effect, wherein the front side of the fire cover blank is sprayed for 5-8 times, and the back side of the fire cover blank is sprayed for 3-4 times. The drying temperature for drying the fire cover is 115 ℃ for 26min, and the sintering temperature for sintering the fire cover is 810 ℃ for 8.5 min.

Thickness of glaze layer in this example: the front surface is 60-150 um; the back surface is 60-100 um.

Example 5:

enamel is prepared on the surface of the burner cap, and the burner cap is made of iron alloy; the method comprises the following steps:

s1, preparing a glaze material from the following raw materials:

s2, mixing the raw materials and performing ball milling to obtain glaze slurry;

100kg of the solid raw material mixture is filled, 110kg of ball stones (40mm ball stones and 60mm ball stones are arranged according to a ratio of 1: 1) are prepared, and 40kg of water is added; and locking the cover of the ball mill, starting the ball mill to perform ball milling for 250min at the rotating speed of 1200r/min, and sieving the glaze slip with a stainless steel mesh sieve with the fineness of 100 percent and the mesh size of 60-80 after ball milling.

And S3, high-temperature deoiling of the fire cover blank, opening a deoiling switch of the high-temperature furnace, heating the temperature of the high-temperature furnace to 800 ℃, deoiling for 7min, controlling the rotating speed parameter of a motor of the high-temperature furnace to be 700r/min, and placing the fire cover blank on a transmission line of the high-temperature furnace for high-temperature deoiling.

S4, performing shot blasting and sand blasting on the surface of the fire cover blank; the shot blasting and sand blasting adopt brown corundum carborundum of 0.6-0.8 mm; the diameter of the fire cover is less than 75mm, 1400pcs is put in each time, and the shot blasting and sand blasting are carried out for 5 min; the diameter of the fire cover is 75 mm-130 mm, 900pcs is placed each time, and shot blasting and sand blasting are carried out for 6 min; the diameter of the fire cover is larger than 130mm, 600pcs are placed each time, and shot blasting and sand blasting are carried out for 6 min.

S5, neutralizing and washing the surface of the fire cover blank; the solvent formula adopted by the neutralization water washing is as follows: 100Kg of normal temperature tap water, 0.8Kg of soda ash, 0.6Kg of sodium nitrite and 0.5Kg of borax.

And S6, spraying glaze on the surface of the fire cover, drying, sintering and cooling. Diluting the glaze slip with water at a ratio of 1.7:1.0, spraying by using a spray gun device, and adjusting the air pressure of the spray gun device to be 0.6-0.8Pa for improving the powder coating rate of the enamel powder; and adjusting the spraying track of the spray gun equipment to achieve an overlapped spraying effect for improving the spraying effect, wherein the front side of the fire cover blank is sprayed for 5-8 times, and the back side of the fire cover blank is sprayed for 3-4 times. The drying temperature for drying the fire cover is 120 ℃, the time is 24min, the sintering temperature for sintering the fire cover is 820 ℃, and the time is 7 min.

Thickness of glaze layer in this example: the front surface is 60-150 um; the back surface is 60-100 um.

Comparative example 1:

compared with the example 3, the glaze material has different contents of each component, and the other operations are the same as the example 3.

The raw materials of this comparative example were as follows:

comparative example 2:

compared with the example 3, the method of dipping glaze and enameling is adopted in the S5 without adopting a glaze spraying mode: uniformly spraying the glaze slurry of S2 on the surface of the fire cover, drying, sintering and cooling; the drying temperature is 110 ℃ and the time is 27min, the sintering temperature is 800 ℃ and the time is 8.5 min. The thickness of the glaze layer was the same as in example 3.

Performance testing

1. Salt spray test

The test conditions are as follows: setting the spraying pressure to be 100kPa, setting the temperature in a box of a salt spray experiment to be 35 +/-2 ℃, setting the concentration of a salt solution to be (5 +/-1)%, standing for 72 hours, placing a fire cover sample into the fire cover sample for testing, taking out the fire cover sample after the test is finished, cleaning the salt layer on the surface with water (only using tap water for washing, not using cloth for wiping), standing for 2 hours and then carrying out visual inspection; the rust point after salt spray is required to be as follows:

a) welding spots: the area of the rust spot is not more than 2mm of the welding scar;

b) the process hanging point is as follows: the area of the rust point is not more than 1mm than that of the hanging point;

c) the other parts are not allowed to rust;

description of the rust spots: the red part belongs to the rusty spot, the white or grey part is the rusty water flow mark, and the red part does not belong to the rusty spot.

And (3) testing results: the surfaces of the burner fire lid enamel samples prepared in examples 1 to 5 were free from significant rust spots, and the rust spots were significant in comparative examples 1 and 2. It is demonstrated that the enamel layers of the burner caps prepared in examples 1 to 5 are excellent in corrosion resistance.

2. Impact resistance test

The test is based on the technical standard of the QMWC-JDK03.016-2016 hearth burner component

And (3) testing results: the steel ball with the diameter of 30mm freely falls from the height of 300mm and impacts the enamel sample of the fire cover of the burner prepared in the embodiment 1-5, and the enamel surface of the sample is not peeled off; whereas the enamel surfaces of comparative examples 1 and 2 had small flaking. It is demonstrated that the enamel layers of the fire covers for burners prepared in examples 1 to 5 are excellent in impact resistance.

3. Combustion test

The test is based on the technical standard of the QMWC-JDK03.016-2016 hearth burner component

The test method comprises the following steps: the enamel fire cover is placed on a product, a proper pot is set, and the maximum heat load is carried out under rated gas pressure (natural gas 2000KPa, liquefied gas 2800 KPa). After 15 minutes of combustion, the fire lid was immersed in normal temperature water and so on for four cycles. And (3) testing results: the enamel samples for burner caps prepared in examples 1 to 5 were not deformed and the enamel was not peeled off in four cycles, while the enamel surfaces of comparative examples 1 and 2 had small peeling. It is demonstrated that the enamel layers of the fire covers of the burners prepared in examples 1 to 5 are excellent in the flame resistance.

Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.