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Method for preparing high-temperature oxidation-resistant coating with high infrared radiation rate by sol-gel method

A high-temperature anti-oxidation, infrared radiation technology, applied in the coating, metal material coating process and other directions, can solve the problems of complex process and high cost of raw materials

Inactive Publication Date: 2012-11-07
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Our laboratory previously announced a high-temperature infrared radiation rate anti-oxidation coating material using silicon oxide and zirconia as raw materials (Chinese patent CN101891398A), but the cost of raw materials used is high and the process is relatively complicated

Method used

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Embodiment Construction

[0011] Now the specific embodiment of the present invention is described as follows:

[0012] With zirconium oxychloride and ethyl orthosilicate as zirconium source and silicon source, lithium chloride as mineralizer, absolute ethanol as co-solvent, hydrochloric acid as catalyst, 0.025 mole of ethyl orthosilicate and absolute ethanol water Mix the solution evenly, slowly add it dropwise into the alcoholic aqueous solution with a pH of 1.5, stir for 3 hours, then slowly add the alcoholic aqueous solution containing 0.025 moles of zirconium oxychloride and 0.005 moles of lithium chloride to form a mixed solution, the total amount of water The amount used is 10 ml; the total amount of absolute ethanol used is 50 ml; stirred at room temperature for 3 hours to form a sol. The above sol was left to stand for 4 days; it was coated on the surface of the silicon carbide substrate by dipping method, dried at 60°C, and calcined at 600°C for 4 hours, finally forming a layer of dense h...

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Abstract

The invention relates to a method for preparing a high-temperature oxidation-resistant coating with high infrared radiation rate by a sol-gel method. The method comprises the following steps of: preparing sol by using tetraethoxysilane and zirconium oxychloride as raw materials and lithium chloride or lithium fluoride as a mineralizer, directly coating the sol on the surface of a silicon carbide or carbon-based composite matrix, drying, and sintering to obtain a layer of compact zirconium silicate high-temperature oxidation-resistant coating with high infrared radiation rate. The technology belongs to the technical field of inorganic nonmetallic materials. The coating prepared by the method has high infrared radiation rate, can be taken as a high-temperature oxidation-resistant coating, and can achieve a forced cooling effect at the same time; and the process is simple and can practically applied conveniently.

Description

technical field [0001] The invention relates to a method for preparing a high-infrared radiation rate high-temperature anti-oxidation coating by a sol-gel method. The coating has a forced heat dissipation function and can be used as a high-temperature anti-oxidation coating. The raw material is cheap, the process is simple, and the operation is convenient. The technology It belongs to the technical field of inorganic non-metallic materials. Background technique [0002] With the development of infrared technology, the research on infrared radiation materials developed rapidly at home and abroad in the late 1980s. Exploring more efficient and targeted infrared radiation materials and mining their application fields have become one of the hot research topics. one. Among them, the high-temperature anti-oxidation coating technology with high infrared radiation rate is worthy of research and can be applied to aerospace and military: (1) It can meet the long-term stable and effic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C26/00
Inventor 甄强马杰张中伟王亚丽李榕
Owner SHANGHAI UNIV
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