阅读说明：本技术 一种免烧的高强度金属陶瓷复合材料及其制备方法和应用 (Baking-free high-strength metal ceramic composite material and preparation method and application thereof ) 是由 刘江波 王玉龙 魏国平 方斌祥 罗明 王落霞 邬晓滢 于 2021-07-29 设计创作，主要内容包括：本发明公开了一种免烧的高强度金属陶瓷复合材料及其制备方法和在制备钢包包口压板、铁水包扒渣板或钢包加热盖中的应用。所述制备方法包括步骤：将不锈钢纤维均匀撒入模具中预铺好,然后向模具中灌入调制好的浆料,边灌浆边振动使浆料密实填充到模具中,自然干燥脱模后经175～185℃烘烤即得所述高强度金属陶瓷复合材料。本发明制备的金属陶瓷复合材料强度高、抗氧化性能及热震稳定性优良。(The invention discloses a non-fired high-strength metal ceramic composite material, a preparation method thereof and application thereof in preparing a ladle opening pressing plate, a ladle slag-off plate or a ladle heating cover. The preparation method comprises the following steps: uniformly scattering stainless steel fibers into a mold for pre-paving, then pouring the prepared slurry into the mold, vibrating while grouting to enable the slurry to be densely filled into the mold, naturally drying, demolding, and baking at 175-185 ℃ to obtain the high-strength metal ceramic composite material. The metal ceramic composite material prepared by the invention has high strength, and excellent oxidation resistance and thermal shock stability.)

1. A preparation method of a baking-free high-strength metal ceramic composite material is characterized by comprising the following steps: uniformly scattering stainless steel fibers into a mold for pre-paving, pouring prepared slurry into the mold, compactly filling the slurry into the mold while grouting and vibrating, naturally drying, demolding, and baking at 175-185 ℃ to obtain the high-strength metal ceramic composite material;

the slurry comprises water and powder; the stainless steel fiber powder comprises, by mass, 15% -26% of the stainless steel fiber and 100% of the powder, wherein the powder comprises the following raw materials in percentage by mass: 7 to 16 percent of corundum particles, 4 to 8 percent of kyanite fine powder and 7 to 12 percent of alpha-Al₂O₃Micro powder, 10 to 20 percent of active alumina micro powder, 17 to 28 percent of silicon carbide fine powder, 0.7 to 4 percent of silicon micro powder, 3 to 10 percent of calcium aluminate cement, 0.02 to 0.08 percent of coagulant, 0.03 to 0.08 percent of antioxidant, 0.03 to 0.08 percent of citric acid and 0.3 to 0.8 percent of water reducing agent; the adding amount of water in the slurry is 7-13% of the mass sum of the stainless steel fiber and the powder;

the length of the stainless steel fiber is 22-28 mm, and the width of the stainless steel fiber is 3-5 mm.

2. The method according to claim 1, wherein the vibration is performed for 3 to 5 min.

3. The method of claim 1, wherein the stainless steel fibers are spread flat in the mold using a vibration assisted method.

4. The method of claim 1, wherein the stainless steel fiber is at least one of a stainless steel bow fiber 446 and a stainless steel fiber 310.

5. A method according to claim 1, wherein Al is contained in the corundum particles₂O₃The content is more than 98.5 wt%, and the granularity of the corundum particles is not more than 1 mm;

al in the fine kyanite powder₂O₃The content is more than 55 wt%, and the granularity of the kyanite fine powder is not more than 0.165 mm;

the alpha-Al₂O₃Al in micro powder₂O₃The content is more than 99 wt%, and the alpha-Al₂O₃The particle size of the micro powder is 3.7-4.3 mu m;

al in the active alumina micro powder₂O₃The content is more than 99 wt%, and the particle size of the activated alumina micro powder is 1.3-1.8 mu m;

the SiC content in the silicon carbide fine powder is more than 90 wt%, and the granularity of the silicon carbide fine powder is less than 0.088 mm;

SiO in the silicon micro powder₂The content is more than 92 wt%, and the granularity of the silicon micropowder is less than 2 mu m;

al in the calcium aluminate cement₂O₃Greater than 69 wt% SiO₂The content is less than 30 wt%.

6. The method of claim 1, wherein the coagulant is at least one selected from KAD-40 and WSM-1-1, and is prepared from kanois aluminate (china).

7. The preparation method according to claim 1, wherein the antioxidant is metal aluminum powder, wherein the Al content is more than 98 wt%, and the particle size of the metal aluminum powder is 0.1-0.25 mm.

8. The preparation method of the water reducing agent according to claim 1, wherein the water reducing agent is selected from at least one of FS65 and FS20, and the manufacturer is Wuhan Shanda chemical Co.

9. The high-strength metal ceramic composite material prepared by the preparation method according to any one of claims 1 to 8.

10. Use of the high strength cermet composite material according to claim 9 in the preparation of ladle lip press plates, ladle slag skimming plates or ladle heating lids.

Technical Field

The invention relates to the field of metal ceramic composite materials, in particular to a non-fired high-strength metal ceramic composite material and a preparation method and application thereof.

Background

The steel ladle is one of the key devices which can not be replaced in the modern steel-making operation as a main container for holding molten steel. At present, the domestic refractory material for the ladle mouth mainly adopts plastic materials or castable materials, and the refractory material for the ladle mouth mainly has the function of compressing a lower ladle slag line refractory brick to prevent the ladle slag line refractory brick from loosening and falling off. Due to the intermittent working mode of the steel ladle, frequent fluctuation of the thermal state of the steel ladle and periodic thermal stress, particularly the temperature change range of a ladle opening is larger, and the refractory material of the ladle opening cracks and peels off; in addition, during the removal of the steel slag nodules at the ladle opening, the intense mechanical movement and impact cause mechanical damage to the refractory material at the ladle opening.

At present, the metal ceramic composite material developed by some companies at home and abroad can play a role in toughening and reinforcing by introducing metal fibers with high elastic modulus and high tensile strength into a ceramic material, change the internal stress distribution of the ceramic material, prevent crack propagation and improve the mechanical impact resistance and the rapid cooling and heating resistance of the ceramic material at high temperature. Meanwhile, the steel fibers are uniformly dispersed in the ceramic material to form a network frame to play a role in drawing and bridging, and crack interfaces generated by the castable can be connected after cracks appear in the ceramic material, so that the ceramic material can still bear load after the cracks appear.

The cermet composite is particularly suitable for conventional refractory materials where the metal parts of the equipment are severely attacked and oxidised, difficult to withstand strong mechanical and thermal shocks, and refractory components which require high maintenance costs.

The patent specification with the publication number of CN 110615688A discloses a low-cost and long-life blast furnace taphole mud sleeve and a preparation method thereof, and the components of the sleeve are as follows by weight percent: regenerated Al with granularity of 10-5 mm₂O₃25-40% of-SiC-C material; 32-50% of regenerated high-alumina material with the particle size of 5-0 mm, 3-7% of silicon carbide powder with the particle size of less than or equal to 0.074mm, 10-20% of mullite micro powder with the particle size of less than or equal to 10 mu m, 3-5% of high-alumina cement and 2-6% of heat-resistant stainless steel fiber. And adding water accounting for 5-8% of the total amount of the dry powder when preparing the mud sleeve, performing vibration casting molding in a mold, and performing normal-temperature curing, demolding and baking at 500-700 ℃ for 12-24 hours to obtain a mud sleeve prefabricated part finished product.

The patent specification with publication number CN 110511046A discloses a refractory castable for a slag stopping component of a continuous casting tundish, which is prepared by mixing the following raw materials in parts by weight: waste magnesia carbon brick reclaimed material: 30-60 parts of magnesia: 12-30 parts of magnesia powder: 12-25 parts of silicon carbide fine powder: 4-8 parts of metal silicon powder: 0.1-5 parts of silicon powder: 3-6 parts of alumina micropowder: 2-6 parts of magnesium bonding agent: 1-3 parts of stainless steel fiber: 0.5-3 parts of a water reducing agent: 0.1-3 parts. The patent technology also discloses a preparation method of the continuous casting tundish slag stopping component, which comprises the following steps: s1, preparing a forming die of the slag stopping component of the continuous casting tundish, adding the magnesium olive sand and the stainless steel fiber into the stirrer, and mixing and stirring for 3-6 min; s2, continuously adding magnesite powder, silicon carbide fine powder, metal silicon powder, silicon micro powder, alumina micro powder, magnesium bonding agent and water reducing agent into the stirrer, and stirring for 3-5 min; s3, adding the waste magnesia carbon brick reclaimed material into a stirrer, and mixing and stirring for 15-25min to form a mixture; s4, adding water accounting for 3.5-4.5 wt% of the mixture into the mixture in the stirrer, and stirring for 10-15min to obtain the refractory castable of the tundish slag-blocking component; s5, pouring the refractory castable into a prepared forming mold of the continuous casting tundish slag stopping component, and vibrating the refractory castable in the mold until the surface of the refractory castable is slurried, wherein the vibration time is more than 10 min; and S6, standing the vibrated refractory castable together with the mould in a dark place for at least 24 hours, demoulding, standing the demoulded and formed refractory castable in a dark place for 48-60 hours, then baking in a kiln, and obtaining the continuous casting tundish slag blocking part after baking.

Disclosure of Invention

The ceramic material has excellent high-temperature strength and melting loss resistance, but has large brittleness, insufficient thermal shock resistance and toughness, the metal material has excellent toughness and ductility but does not resist high temperature, the metal material and the metal material are combined, the metal fiber is introduced into the ceramic material to prepare the metal ceramic composite material, the metal fiber can play a toughening and reinforcing effect on the ceramic material, the metal fiber is uniformly dispersed in the ceramic material to form a network frame shape, the crack expansion of the ceramic material can be prevented, and the mechanical impact resistance and the rapid cooling and rapid heating resistance of the ceramic material at high temperature are improved.

Aiming at the defects in the field, the invention provides a preparation method of a non-fired high-strength metal ceramic composite material, and the obtained metal ceramic composite material has excellent performances of high strength, structural uniformity (the uniformity of steel fiber and particle material dispersion can be judged by observing a sample section), oxidation resistance and the like.

A preparation method of a baking-free high-strength metal ceramic composite material comprises the following steps: uniformly scattering stainless steel fibers into a mold for pre-paving, pouring prepared slurry into the mold, compactly filling the slurry into the mold while grouting and vibrating, naturally drying, demolding, and baking at 175-185 ℃ to obtain the high-strength metal ceramic composite material;

the slurry comprises water and powder; the stainless steel fiber powder comprises, by mass, 15% -26% of the stainless steel fiber and 100% of the powder, wherein the powder comprises the following raw materials in percentage by mass: 7 to 16 percent of corundum particles, 4 to 8 percent of kyanite fine powder and 7 to 12 percent of alpha-Al₂O₃Micro powder, 10% -20% livingFine alumina powder, fine silicon carbide powder 17-28%, fine silicon powder 0.7-4%, calcium aluminate cement 3-10%, coagulant 0.02-0.08%, antioxidant 0.03-0.08%, citric acid 0.03-0.08% and water reducing agent 0.3-0.8%; the adding amount of water in the slurry is 7-13% of the mass sum of the stainless steel fiber and the powder;

the length of the stainless steel fiber is 22-28 mm, and the width of the stainless steel fiber is 3-5 mm.

The preparation method provided by the invention is optimized in cooperative control from two aspects of material and preparation process, and the metal ceramic composite material with excellent strength and oxidation resistance can be obtained without sintering. Specifically, the method comprises the following steps: in the aspect of materials, the invention adds stainless steel fibers with specific length and width to match with Al with specific composition₂O₃-SiO₂Making slurry, and carefully controlling the dosage proportion of each component; in the aspect of preparation process, the stainless steel fiber and the sizing agent are firstly separated, and Al with specific composition is prepared₂O₃-SiO₂The sizing agent is put into a mould pre-paved with stainless steel fibers under the vibration condition, and after the sizing agent is densely filled in the mould, the mould is naturally dried, demoulded and baked without further sintering.

In order to better achieve the purpose of the invention, solve the technical problems and obtain better technical effects, the invention can optimize the following technical scheme:

the vibration time is preferably 3-5 min.

Preferably, the stainless steel fibers are spread out and flattened in the mold in a vibration-assisted manner. In order to avoid the stainless steel fibers from flying out in the vibration process, the mold can be covered by a wood plate.

The stainless steel fibers are preferably at least one of stainless steel arcuate fibers 446 and stainless steel fibers 310, and more preferably stainless steel arcuate fibers 446. The high-strength metal ceramic composite material obtained by using the stainless steel arch fibers 446 has the normal-temperature rupture strength of not less than 40MPa, the normal-temperature compressive strength of not less than 115MPa, the rupture strength of not less than 10MPa at 1200 ℃ for 0.5h, and the oxidation resistance can be further improved.

Preferably, Al in the corundum particles₂O₃The content is more than 98.5 wt%, and the granularity of the corundum particles is not more than 1 mm.

Preferably, Al in the kyanite fine powder₂O₃The content is more than 55 wt%, and the granularity of the kyanite fine powder is not more than 0.165 mm.

Preferably, the alpha-Al₂O₃Al in micro powder₂O₃The content is more than 99 wt%, and the alpha-Al₂O₃The particle size of the micro powder is 3.7-4.3 μm.

Preferably, Al in the activated alumina micro powder₂O₃The content is more than 99 wt%, and the particle size of the activated alumina micro powder is 1.3-1.8 mu m.

Preferably, the SiC content in the silicon carbide fine powder is more than 90 wt%, and the particle size of the silicon carbide fine powder is less than 0.088 mm.

Preferably, SiO in the fine silicon powder₂The content is more than 92 wt%, and the granularity of the silicon micropowder is less than 2 mu m.

Preferably, Al in the calcium aluminate cement₂O₃Greater than 69 wt% SiO₂The content is less than 30 wt%.

The coagulant is preferably at least one of KAD-40 and WSM-1-1, and is prepared from Kanus aluminate (China) Co.

The antioxidant is preferably metal aluminum powder. Further preferably, the Al content in the metal aluminum powder is more than 98 wt%, and the particle size of the metal aluminum powder is 0.1-0.25 mm.

The water reducing agent is preferably selected from at least one of FS65 and FS20, and the manufacturer is Wuhan Shangda chemical industry Co.

The invention also provides the high-strength metal ceramic composite material prepared by the preparation method.

The invention also provides application of the high-strength metal ceramic composite material in preparation of a ladle mouth pressing plate, a ladle slag-off plate or a ladle heating cover.

Compared with the prior art, the invention has the main advantages that:

1) the invention firstly distributes stainless steel fibers with specific length and width in a mould in a disordered way to form a network structure, and then Al with specific composition₂O₃-SiO₂The sizing agent is poured into the metal fiber, the adding proportion of the sizing agent and the metal fiber is controlled, the vibration forming is assisted, the sizing agent is densely filled in the network structure of the stainless steel fiber, the material preparation process is simple, and the high-strength antioxidant metal ceramic composite material can be obtained without sintering.

2) The introduction of the stainless steel fiber with specific dosage proportion and specific length and width obviously improves the fracture toughness of the material. The metal ceramic composite material of the invention has the characteristics of high toughness and plasticity of metal, high melting point, corrosion resistance, abrasion resistance and the like of ceramic, so that the metal ceramic composite material has the advantages of good isotropy, structural uniformity, oxidation resistance and high-temperature creep resistance, and simultaneously has the advantages of improved strength, toughness, heat conductivity and the like.

Drawings

FIG. 1 is a photograph of an oxidation-resistant cross-section of the cermet composite material of example 1 after heat-treatment at different temperatures for 3 hours, wherein (a)1000 ℃, (b)1100 ℃, (c)1200 ℃;

FIG. 2 is a photograph of an oxidation-resistant cross-section of the cermet composite material of example 2 after heat-treatment at different temperatures for 3 hours, wherein (a)1000 ℃, (b)1100 ℃, (c)1200 ℃;

FIG. 3 is a photograph of an oxidation-resistant cross-section of the cermet composite material of example 3 after heat-treatment at different temperatures for 3 hours, wherein (a)1000 ℃, (b)1100 ℃, (c)1200 ℃;

FIG. 4 is a photograph of oxidation-resistant cross-section of the cermet composite material of example 4 after heat-treatment at different temperatures for 3 hours, wherein (a)1000 ℃, (b)1100 ℃, (c)1200 ℃.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The following examples are conducted under conditions not specified, usually according to conventional conditions, or according to conditions recommended by the manufacturer.

The technical parameters, characteristics and the like of the raw materials involved in the following examples are described as follows:

the length of the stainless steel fiber is 22-28 mm, and the width of the stainless steel fiber is 3-5 mm;

al in corundum particles₂O₃The content is more than 98.5 wt%, and the granularity of corundum particles is not more than 1 mm;

al in fine kyanite powder₂O₃The content is more than 55 wt%, and the granularity of the kyanite fine powder is not more than 0.165 mm;

α-Al₂O₃al in micro powder₂O₃More than 99 wt% of alpha-Al₂O₃The particle size of the micro powder is 3.7-4.3 mu m;

al in active alumina micropowder₂O₃The content is more than 99 wt%, and the granularity of the activated alumina micro powder is 1.3-1.8 mu m;

the SiC content in the silicon carbide fine powder is more than 90 wt%, and the granularity of the silicon carbide fine powder is less than 0.088 mm;

SiO in silica micropowder₂The content is more than 92 wt%, and the granularity of the silicon micropowder is less than 2 mu m;

al in calcium aluminate cement₂O₃Greater than 69 wt% SiO₂The content is less than 30 wt%;

the coagulant KAD-40 is Kanuo si aluminate (China) Co., Ltd;

coagulant WSM-1-1, manufactured by Kanuoist aluminate (China) Co., Ltd;

the antioxidant is metal aluminum powder, wherein the Al content is more than 98 wt%, and the particle size of the metal aluminum powder is 0.1-0.25 mm;

the water reducing agent FS65 is produced by Wuhan Shangda chemical company Limited;

the water reducing agent FS20 is produced by Wuhan Shangda chemical company Limited.

If not specifically stated, the percentage of the amount of each component is mass percent, and the sum of the mass of the stainless steel fiber and the mass of the powder is 100%.

The normal-temperature flexural strength test standard/method of the metal ceramic composite material prepared in each example and comparative example refers to GB/T3001, the normal-temperature compressive strength test standard/method refers to GB/T5072, the 1200 ℃ x 0.5h flexural strength test standard/method refers to GB/T3001, and the oxidation resistance test standard/method refers to GB/T13244.

Example 1

The method comprises the following steps: 25 wt% of stainless steel fibers 310 are uniformly sprinkled into the mold and pre-laid. Because the addition of the stainless steel fiber is large, the vibration assistance is needed on a vibration table to ensure that the steel fiber is fully paved and leveled in the die, and in order to avoid flying out of the steel fiber in the vibration process, the die can be covered by a wood plate.

Step two: and (4) preparing slurry. 11 wt% of corundum particles, 6 wt% of kyanite fine powder and 11 wt% of alpha-Al₂O₃The slurry is prepared by uniformly stirring and mixing micro powder, 12 wt% of activated alumina micro powder, 25 wt% of silicon carbide fine powder, 2 wt% of silicon micro powder, 7.5 wt% of calcium aluminate cement, 0.03 wt% of coagulant KAD-40 and WSM-1-1, 0.03 wt% of antioxidant metal Al powder, 0.04 wt% of citric acid, 0.4 wt% of water reducing agent FS65 and 13 wt% of added water.

Step three: grouting and forming. And (3) pouring the prepared slurry in the second step into the mould paved with the steel fibers in the first step, grouting while vibrating to enable the slurry to be densely filled into the mould, naturally drying, demoulding and baking at 180 ℃ to obtain the high-strength metal ceramic composite material.

The metal ceramic composite material prepared in the embodiment is detected as follows: the normal-temperature rupture strength is 45.2MPa, the normal-temperature compressive strength is 78.3MPa, the rupture strength at 1200 ℃ is 6.5MPa after 0.5h, the slag resistance experiment erosion index of a 1100 ℃ static crucible method is 12.3-15.6%, and the oxidation resistance is poor (see attached figure 1).

Example 2

The method comprises the following steps: 25 wt% of stainless steel bow fibers 446 are uniformly sprinkled into the mold to be pre-laid. Because the addition of the stainless steel fiber is large, the vibration assistance is needed on a vibration table to ensure that the steel fiber is fully paved and leveled in the die, and in order to avoid flying out of the steel fiber in the vibration process, the die can be covered by a wood plate.

Step two: and (4) preparing slurry. 10 wt% of corundum particles, 6 wt% of kyanite fine powder and 10 wt% of alpha-Al₂O₃The slurry is prepared by uniformly stirring and mixing micro powder, 14 wt% of activated alumina micro powder, 25 wt% of silicon carbide fine powder, 2 wt% of silicon micro powder, 7.5 wt% of calcium aluminate cement, 0.02 wt% of coagulant KAD-40 and WSM-1-1, 0.04 wt% of antioxidant metal Al powder, 0.04 wt% of citric acid, 0.4 wt% of water reducing agent FS65 and 11 wt% of added water.

Step three: grouting and forming. And (3) pouring the prepared slurry in the second step into the mould paved with the steel fibers in the first step, grouting while vibrating to enable the slurry to be densely filled into the mould, naturally drying, demoulding and baking at 180 ℃ to obtain the high-strength antioxidant metal ceramic composite material.

The metal ceramic composite material prepared in the embodiment is detected as follows: the normal temperature rupture strength is 85.8MPa, the normal temperature compressive strength is 134.2MPa, the rupture strength at 1200 ℃ is 12.4MPa for 0.5h, the erosion index of a 1100 ℃ static crucible method slag resistance experiment is 8.8-10.5%, and the oxidation resistance is excellent (see attached figure 2).

Example 3

The method comprises the following steps: stainless steel bow fibers 446 in an amount of 26 wt% are uniformly sprinkled into the mold and pre-laid. Because the addition of the stainless steel fiber is large, the vibration assistance is needed on a vibration table to ensure that the steel fiber is fully paved and leveled in the die, and in order to avoid flying out of the steel fiber in the vibration process, the die can be covered by a wood plate.

Step two: and (4) preparing slurry. 10 wt% of corundum particles, 5 wt% of kyanite fine powder and 10 wt% of alpha-Al₂O₃The slurry is prepared by uniformly stirring and mixing micro powder, 15 wt% of activated alumina micro powder, 25 wt% of silicon carbide fine powder, 2 wt% of silicon micro powder, 6.5 wt% of calcium aluminate cement, 0.02 wt% of coagulant KAD-40 and WSM-1-1, 0.04 wt% of antioxidant metal Al powder, 0.04 wt% of citric acid, 0.4 wt% of water reducing agent FS20 and 12.2 wt% of added water.

Step three: grouting and forming. And (3) pouring the prepared slurry in the second step into the mould paved with the steel fibers in the first step, grouting while vibrating to enable the slurry to be densely filled into the mould, naturally drying, demoulding and baking at 180 ℃ to obtain the high-strength antioxidant metal ceramic composite material.

The metal ceramic composite material prepared in the embodiment is detected as follows: the normal temperature rupture strength is 57.0MPa, the normal temperature compressive strength is 119.6MPa, the rupture strength at 1200 ℃ is 12.3MPa for 0.5h, the slag resistance experiment erosion index of a 1100 ℃ static crucible method is 9.6-11.3%, and the oxidation resistance is excellent (see attached figure 3).

Example 4

The method comprises the following steps: 24 wt% stainless steel bow fibers 446 are uniformly sprinkled into the mold to be pre-laid. Because the addition of the stainless steel fiber is large, the vibration assistance is needed on a vibration table to ensure that the steel fiber is fully paved and leveled in the die, and in order to avoid flying out of the steel fiber in the vibration process, the die can be covered by a wood plate.

Step two: and (4) preparing slurry. 11 wt% of corundum particles, 5 wt% of kyanite fine powder and 11 wt% of alpha-Al₂O₃The slurry is prepared by uniformly stirring and mixing micro powder, 15 wt% of activated alumina micro powder, 25 wt% of silicon carbide fine powder, 2 wt% of silicon micro powder, 6.6 wt% of calcium aluminate cement, 0.02 wt% of coagulant KAD-40 and WSM-1-1, 0.04 wt% of antioxidant metal Al powder, 0.04 wt% of citric acid, 0.3 wt% of water reducing agent FS65 and 12.2 wt% of added water.

Step three: grouting and forming. And (3) pouring the prepared slurry in the second step into the mould paved with the steel fibers in the first step, grouting while vibrating to enable the slurry to be densely filled into the mould, naturally drying, demoulding and baking at 180 ℃ to obtain the high-strength antioxidant metal ceramic composite material.

The metal ceramic composite material prepared in the embodiment is detected as follows: the normal-temperature rupture strength is 41.0MPa, the normal-temperature compressive strength is 143.1MPa, the rupture strength at 1200 ℃ is 10.2MPa for 0.5h, the slag resistance experiment erosion index of a 1100 ℃ static crucible method is 9.2-12.1%, and the oxidation resistance is excellent (see attached figure 4).

Therefore, the metal ceramic composite material prepared by the invention has high strength, excellent oxidation resistance and thermal shock stability, and can be widely applied to the parts of a ladle opening pressing plate, a ladle slag removing plate, a ladle heating cover and the like.

Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the above description of the present invention, and equivalents also fall within the scope of the invention as defined by the appended claims.