SiCf-ZrC-ZrB2 ceramic composite powder and preparation method thereof

Abstract

The invention discloses SiCf-ZrC-ZrB2 ceramic composite powder and a preparation method thereof. The preparation method comprises the steps: preparing a zirconium oxychloride ethanol solution, a boricacid ethanol solution, an ethyl orthosilicate ethanol solution and a glucose aqueous solution and mixing the solutions to be uniform, to obtain a boron-silicon-zirconium precursor solution; and drying the target precursor solution, and carrying out heat treatment under the protection of an argon atmosphere to obtain SiCf-ZrC-ZrB2 composite ceramic powder in which SiC fibers with controllable sizes and uniform and fine ZrC-ZrB2 ceramic particles are uniformly dispersed. The prepared ceramic powder fiber and ceramic particles are uniformly dispersed, and the length of the fiber can be controllably adjusted between 10 [mu]m and 100 [mu]m; the ceramic particles are small in particle size and uniform in size, and the average particle size is about 30-50 nm. The process is simple and reliable,and raw materials are safe, nontoxic and low in cost; the preparation period is short, the forming temperature of the ceramic phase is low, the ceramic particles are uniform and fine, the nanowires and the ceramic particles are uniformly distributed, the sizes of the nanowires are controllable, and the problems of preparation and mixing uniformity of raw material powder for preparing SiC fiber reinforced ZrC-ZrB2 ceramic-based composite materials with different sizes are effectively solved.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, in particular to a SiC f -ZrC-ZrB 2 Ceramic composite powder and its preparation method. Background technique [0002] Ultra-high temperature ceramics mainly include transition metal ceramics with high melting point, such as boride and carbide ceramics (ZrB 2 , ZrC, HfB 2 and HfC, etc.). ZrB 2 Ultra-high temperature ceramics such as -ZrC have broad application prospects in the aerospace field because of their unique and excellent properties. In order to improve the inherent brittleness of ceramic materials, it is an inevitable trend in the development of ultra-high temperature ceramics to design and prepare second-phase reinforced ceramic matrix composites such as particles, whiskers, and fibers. Among them, SiC fiber (SiC f , f is the initial letter of fiber (fiber), such as whiskers, nanowires have been widely used in recent years as effective reinforcement and toughening mater...

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Problems solved by technology

[0005] In order to overcome the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of SiCf-ZrC-ZrB 2 Ceramic composite powder and preparation method thereof, aiming at solving ZrC-ZrB 2 While the introduction of SiC fibers in the multi-phase ceramic powder and the uniformity of dispersion, it solves the problems of the refinement and uniformity of dispersion of ceramic phase particles, the size control of SiC fibers, and the complexity and high cost of the existing preparation methods. It has the characteristics of simple and easy-to-obtain raw materials, safety and non-toxicity, simple and easy-to-control process, low pyrolysis temperature, and the size of SiC whiskers is controllable. ZrC-ZrB 2 The ceramic particles are uniform and fine, evenly dispersed

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