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Long-acting protective coating for furnace wall of gas nitriding furnace and preparation method thereof

A gas nitriding and protective coating technology, applied in the field of material science, can solve the problems of decreased adhesion between coating and metal layer, easy oxidation of metal, poor bonding ability, etc., to improve high temperature resistance performance and chemical stability, guarantee The effect of long-term continuous use and improved temperature difference resistance

Active Publication Date: 2021-06-01
武汉铭高新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Metals are easily oxidized at high temperatures. In order to overcome this problem, coatings are usually used to protect the surface of metal materials. The conventional coating structure has poor bonding ability with the metal itself, and after many times of thermal expansion and contraction, The adhesion between the coating and the metal layer decreases, and even cracks or peeling may occur. To overcome this problem, a high-temperature resistant layer can also be compounded on the surface of the metal
[0003] However, in the field of metal processing, the nitriding furnace will not only repeatedly experience high temperatures, but also be filled with gas containing nitrogen elements, so the inner wall of the furnace will also be repeatedly covered with nitrogen elements during the nitriding process, resulting in excessive nitriding. The high temperature resistant metal layer is used, and the over-nitrided furnace is easy to crack and be scrapped. Therefore, it is an urgent technical problem to provide a long-term protective coating for the nitriding furnace wall with anti-nitridation and high temperature resistance.

Method used

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  • Long-acting protective coating for furnace wall of gas nitriding furnace and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 15kg sodium silicate, 36kg silicon dioxide, 35kg boric anhydride, 10kg calcium oxide, 2kg copper oxide, 1kg potassium fluoroborate and 1kg potassium carbonate respectively, add 100kg water after mixing, mix and stir to obtain a mixed slurry, mix the mixed slurry The material is sprayed on the inner wall surface of the nitriding furnace with an average thickness of 0.3 mm, and a protective coating is obtained after drying.

Embodiment 2

[0025] Weigh 35kg of sodium silicate, 31kg of silicon dioxide, 20kg of boric anhydride, 5kg of calcium oxide, 5kg of copper oxide, 2kg of potassium fluoroborate, 2kg of potassium carbonate and 150kg of silicon carbide, mix and add 250kg of water, mix and stir to obtain a mixed slurry , spray the mixed slurry on the inner wall surface of the nitriding furnace, the average thickness of the spray is 0.4mm, and obtain a protective coating after drying.

Embodiment 3

[0027] Weigh 28kg sodium silicate, 30kg silicon dioxide, 30kg boric anhydride, 6kg calcium oxide, 4kg copper oxide, 2kg potassium fluoroborate, 100kg aluminum oxide, 50kg silicon carbide and 50kg tin powder, mix and add 300kg water, mix and stir The mixed slurry is obtained, and the mixed slurry is sprayed on the inner wall surface of the nitriding furnace with an average thickness of 0.5 mm, and the protective coating is obtained after drying.

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Abstract

The invention provides a long-acting protective coating for a furnace wall of a gas nitriding furnace and a preparation method thereof. The protective coating comprises an adhesive, silicon dioxide, boric anhydride, calcium oxide, copper oxide and sylvite, and preferably further comprises an anti-seepage agent. The melting point of a glass coating is adjusted, so that the coating is of a glass molten state structure at high temperature and has good viscosity and sealing effects, the coating is converted into solid glass after being cooled to the normal temperature, and the coating can keep a complete structure under temperature difference impact. The coating also contains functional elements such as boron, silicon, copper and potassium, the physical and chemical properties of a coating layer can be improved, and the coating has a good application prospect.

Description

technical field [0001] The invention relates to the field of material science and technology, in particular to a long-term protection coating for a gas nitriding furnace wall and a preparation method thereof. Background technique [0002] Metals are easily oxidized at high temperatures. In order to overcome this problem, coatings are usually used to protect the surface of metal materials. The conventional coating structure has poor bonding ability with the metal itself, and after many times of thermal expansion and contraction, The adhesion between the coating and the metal layer decreases, and even cracks or peeling may occur. To overcome this problem, a high-temperature resistant layer can also be compounded on the surface of the metal. [0003] However, in the field of metal processing, the nitriding furnace will not only repeatedly experience high temperatures, but also be filled with gas containing nitrogen elements, so the inner wall of the furnace will also be repeate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/02C09D7/61
CPCC09D1/02C09D7/61C09D5/18Y02P20/10
Inventor 乔琛张炼
Owner 武汉铭高新材料有限公司
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