阅读说明：本技术 一种用于搪瓷生产的等离子热喷涂粉末的制备工艺 (Preparation process of plasma thermal spraying powder for enamel production ) 是由 陈安明 赵坚 欧阳希禹 于 2021-09-07 设计创作，主要内容包括：本发明涉及新材料的制备,特别是一种用于搪瓷生产的等离子热喷涂粉末的制备工艺。针对现有搪瓷生产工艺在制品烧成时需要将整个制品全部放入炉窑进行整体加热烧成,对炉窑要求高、能耗大、并且超大工件不能进行搪烧等问题,本发明一种用于搪瓷生产的等离子热喷涂粉末的制备工艺,通过对搪瓷釉料颗粒进行粉末化包裹处理,可以满足等离子热喷涂工艺的要求,将等离子热喷涂工艺用于搪瓷制品的生产。(The invention relates to the preparation of new materials, in particular to a preparation process of plasma thermal spraying powder for enamel production. The invention relates to a preparation process of plasma thermal spraying powder for enamel production, which aims to solve the problems that the whole product is required to be completely put into a furnace kiln for integral heating and firing when the product is fired by the existing enamel production process, the furnace kiln is high in requirement and high in energy consumption, an oversized workpiece cannot be subjected to enamel firing and the like.)

1. A preparation process of plasma thermal spraying powder for enamel production is characterized by comprising the following steps:

step one, preparing a spraying enamel glaze:

the composite material comprises the following components in percentage by mass:

SiO₂：48-53，Al₂O₃：3-5，B₂O₃：14-17，K₂O：4-6，Na₂O：9-12，Li₂O：2-3，TiO₂：3-4，ZrO：1-2，CoO：0.3-0.6，NiO：1-1.5，MnO₂：2-3；

uniformly mixing the raw materials according to the components, melting the raw materials in a 1300-1350 ℃ glaze melting furnace to obtain an enamel melt with uniform composition, taking out the enamel melt, and rapidly cooling to obtain an enamel glaze;

secondly, preparing plasma glaze powder:

ball-milling 100 parts of glaze with 35 parts of water and 5 parts of ethanol in a ball mill until the fineness D50 is 21-23 micrometers, screening by using an 80-mesh sieve, and drying at low temperature for later use;

step three, wrapping treatment:

100 parts of glaze powder is added with 0.5 part of organic silicone oil, and the glaze powder is wrapped by an airflow grinding mill, and the fluidization detected by a sales fluidization detector is more than or equal to 70.

2. A process for the preparation of a plasma thermal spray powder for enamel production as claimed in claim 1, characterized in that: in the first step, the components by mass percent are as follows: SiO 2₂：49%，Al₂O₃：4%，B₂O₃：16%，K₂O：5.9%，Na₂O：11.6%，Li₂O：3.5%，TiO₂：3%，ZrO：1%，CoO：0.5%，NiO：1.5%，MnO₂：3%。

Technical Field

The invention relates to the preparation of new materials, in particular to a preparation process of plasma thermal spraying powder for enamel production.

Background

The whole product is generally heated in a firing furnace during firing in enamel production, the problem of small products is not great, the product influence on large-scale equipment such as a production reaction kettle is great, multiple firing is realized, the requirement on firing furnace equipment is high, the energy consumption is high, local heating spraying can be adopted by adopting plasma thermal spraying, the thickness of a coating can be controlled, one-time enameling can be finished, the production process is simplified, the production cost is reduced, the corrosion resistance, the wear resistance and other physical and chemical properties of an enamel layer are improved, and the enamel coating has great practical and economic values.

At present, powder materials for plasma spraying at home and abroad mainly comprise alloy materials and some ceramic materials, the powder materials and the spraying process are mature, but the coating powder materials are quite expensive and cannot be widely popularized and applied.

Disclosure of Invention

The invention aims to provide a preparation process of plasma thermal spraying powder for enamel production.

The purpose of the invention is realized by the following ways: a preparation process of plasma thermal spraying powder for enamel production comprises the following steps:

step one, preparing a spraying enamel glaze:

the composite material comprises the following components in percentage by mass:

SiO₂：48-53，Al₂O₃：3-5，B₂O₃：14-17，K₂O：4-6，Na₂O：9-12，Li₂O：2-3，TiO₂：3-4，ZrO：1-2，CoO：0.3-0.6，NiO：1-1.5，MnO₂：2-3；

uniformly mixing the raw materials according to the components, melting the raw materials in a 1300-1350 ℃ glaze melting furnace to obtain an enamel melt with uniform composition, taking out the enamel melt, and rapidly cooling to obtain an enamel glaze;

secondly, preparing plasma glaze powder:

ball-milling 100 parts of glaze with 35 parts of water and 5 parts of ethanol in a ball mill until the fineness D50 is 21-23 micrometers, screening by using an 80-mesh sieve, and drying at low temperature for later use;

step three, wrapping treatment:

100 parts of glaze powder is added with 0.5 part of organic silicone oil, and the glaze powder is wrapped by an airflow grinding mill, and the fluidization detected by a sales fluidization detector is more than or equal to 70.

As a further optimization of the scheme, in the step one, the components by mass percentage are as follows: SiO 2₂：49%，Al₂O₃：4%，B₂O₃：16%，K₂O：5.9%，Na₂O：11.6%，Li₂O：3.5%，TiO₂：3%，ZrO：1%，CoO：0.5%，NiO：1.5%，MnO₂: 3 percent. The invention relates to a preparation process of plasma thermal spraying powder for enamel production, which aims to solve the problems that the whole product is required to be completely put into a furnace kiln for integral heating and firing when the product is fired by the existing enamel production process, the furnace kiln is high in requirement and high in energy consumption, an oversized workpiece cannot be subjected to enamel firing and the like.

Compared with the prior art, the invention has the following advantages:

1. the glaze adopts SiO₂-R₂O-B₂O₃The glaze network system is characterized in that cobalt, nickel, manganese and titanium, zirconium and aluminum are added into the glaze system, and the high-temperature molten glaze not only has the capacity of being combined with a steel plate, but also has excellent corrosion resistance, temperature resistance and other properties;

2. the powder prepared by adopting the wet ball milling and special coating treatment process can well meet the requirement of a plasma thermal spraying process, has lower production cost, can reduce the cost of a plasma spraying material, and can expand the application field of the plasma thermal spraying process;

3. the plasma spraying process is adopted for enamel coating in enamel production, so that the production process is simplified, the production cost is reduced, and the difficult problems of enamel coating and repairing the surface of large-scale enamel pieces such as a reaction kettle and the like are solved.

Detailed Description

The invention relates to a preparation process of plasma thermal spraying powder for enamel production, which comprises the following steps:

the first step is the preparation of spraying enamel glaze, which is combined with steel plate and has excellent physical and chemical performance, and SiO is used₂-R₂O-B₂O₃The glaze network system is characterized in that a component which can combine the glaze and the steel plate is added in the glaze system, and a titanium zirconium aluminum component is added to improve the physicochemical properties of corrosion resistance, temperature resistance and the like of the glaze;

the composite material comprises the following components in percentage by mass:

SiO₂：49%，Al₂O₃：4%，B₂O₃：16%，K₂O：5.9%，Na₂O：11.6%，Li₂O：3%，TiO₂：3%，ZrO：1%，CoO：0.5%，NiO：1.5%，MnO₂：3%；

uniformly mixing the raw materials according to the components, melting the mixture in a glaze melting furnace at the temperature of 1320 ℃ for 60 minutes, taking out the mixture, pouring the mixture into water, and rapidly cooling the mixture to obtain homogeneous glaze frit;

secondly, preparing plasma glaze powder:

ball-milling 100 parts of glaze with 35 parts of water and 5 parts of ethanol in a ball mill until the fineness D50 is 21-23 micrometers, screening by using an 80-mesh sieve, and drying at low temperature for later use; according to the principle of plasma spraying, the powder for plasma spraying can be subjected to plasma spraying only if the powder has better fluidization performance, the powder is ground into a smooth and more spherical shape by adopting wet ball milling compared with dry powder, glaze is ground into a proper fineness by adding a proper amount of water and a small amount of ethanol in a ball mill, and the glaze is dried at a low temperature. When the plasma spraying powder is prepared, the whole powder is not easy to form a spherical product by a common preparation method, and the surface is coated by a liquid phase or vapor deposition method in order to increase the fluidity. The glaze powder is wrapped by the organic silicon oil, so that the fluidization property of the glaze powder can be improved.

Step three, wrapping treatment:

100 parts of glaze powder is added with 0.5 part of organic silicone oil, and the glaze powder is wrapped by an airflow grinding mill, and the fluidization detected by a sales fluidization detector is more than or equal to 70.

Use of enamel powder: powder is loaded into a powder feeder of the plasma thermal spraying equipment, and switches of a main power supply, a direct current power supply, a water cooler, argon, hydrogen and the like are sequentially turned on. And after preheating is finished, the powder feeder is started, and the flow of powder feeding gas is adjusted. The samples are sequentially arranged and fixed on a workbench, and a spray gun makes reciprocating linear motion at a specified spraying distance until the thickness of the coating meets the requirement.