Precursor-conversion-method preparation process of self-dispersion superfine ZrC-SiC ceramic composite powder

Abstract

The invention discloses a precursor-conversion-method preparation process of self-dispersion superfine ZrC-SiC ceramic composite powder. Zirconium oxychloride octahydrate and tetraethoxysilane are used as a zirconium source and a silicon source; glucose is adopted as a carbon source and a carbonization product dispersing agent in a pyrolysis process, hydrogen peroxide is adopted as a hydrolysis accelerant and absolute ethyl alcohol and deionized water are adopted as composite solvents, and the process comprises respectively preparing a zirconium precursor solution, a tetraethoxysilane solutionand a glucose solution and uniformly mixing the solutions to obtain a silicon-zirconium precursor solution; and drying the silicon-zirconium precursor solution, and carrying out heat treatment at 1450-1600 DEG C for 1-2 hours under argon atmosphere protection to obtain the ZrC-SiC ceramic powder with favorable dispersity, a narrow particle size distribution range and an average particle size of less than 100 nm. The raw materials are safe and non-toxic, the cost is low, the process is simple, the reaction process is easy to control, the synthesis temperature is low, and the prepared ceramic powder is fine and uniform in particle size, good in dispersity and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and relates to a preparation method of an ultra-high temperature ceramic raw material powder, in particular to a preparation process of a self-dispersing ultrafine ZrC-SiC ceramic composite powder by a precursor conversion method. Background technique [0002] As one of the most potential ultra-high temperature ceramic materials, ZrC is widely used in aerospace, electronics, nuclear industry and other fields. In order to reduce the sintering temperature of ZrC ceramics and improve the fracture toughness and anti-oxidation ablation performance, one of the commonly used methods is to introduce a certain proportion of SiC ceramic phase through the mixing method, in which SiC can play the role of sintering aid on the one hand, and on the other On the one hand, it can refine the grain and form a glassy oxide film in a high-temperature environment, thereby effectively improving the mecha...

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Problems solved by technology

The cost of raw materials used in this method is low, and the operation is simple, but high temperature is required, the reaction time is long, and the prepared powder is seriously agglomerated.

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