Precursor solution of carbide ceramic, carbide ceramic and preparation thereof

Abstract

The invention discloses precursor solution for carbide ceramics. The precursor solution uses an alkoxy compound of more than one refractory metal as solute, and uses divinylbenzene, vinyl group acetylenyl benzene or diacetylene-benzene as solvent, and the molar ratio of the solute to the solvent is 1 to between 0.2 and 2. The invention also discloses carbide ceramics and a preparation method thereof. The method comprises the following preparation steps: the precursor solution of the invention is evenly mixed and heated to between 150 and 300 DEG C, and then is insulated for 0.5 to 4 hours; the precursor after low temperature crosslinking treatment is heated to between 1, 200 and 1, 800 DEG C in an inert atmosphere or under a vacuum condition, and then is insulated for 0.5 to 2 hours for high temperature pyrolysis; and the carbide ceramics is obtained after temperature reduction. The precursor solution has the advantages of low viscosity, good stability, simple preparation process, and so on. The method for preparing the carbide ceramics has the advantages of high impregnation efficiency, simple crosslinking process, high ceramics yield, and so on.

Description

technical field [0001] The invention relates to a precursor solution of ceramics and a process for preparing ceramics from the precursor solution, in particular to a precursor solution of ultra-high temperature carbide ceramics and a preparation process for ultra-high temperature carbide ceramics. Background technique [0002] The improvement of the flight speed of aerospace vehicles puts forward higher and higher requirements for materials. When the aircraft re-enters, the nose cone, wing leading edge and other parts of the aircraft will be subjected to a severe thermal environment of large heat flow (tens of megawatts to hundreds of megawatts), instantaneous high temperature and ultra-high temperature (2000-3000 °C). Due to the large amount of ablation and asynchronous ablation of traditional ablation heat-resistant materials, the external dimensions of the aircraft change greatly, which seriously affects the flight attitude and flight trajectory. In addition, the throat ...

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Problems solved by technology

[0006] Xianghua proposed the use of TaCl in his master's thesis "Preparation of C / C-TaC Composite Materials by Chemical Liquid Phase Infiltration and Its Ablation Properties" (Master's Thesis of Northwestern Polytechnical University, 2006) 5 +HF+furan resin (ethanol as solvent) is used as TaC ceramic precursor to prepare C / C-TaC composite materials, but this precursor also has the disadvantages of low solute concentration, poor stability, and low ceramic yield.

[0007] Therefore, the ultra-high temperature carbide ceramic precursors used in the existing precursor impregnation-cracking process have disadvantages such as low precursor concentration in the solution, low yield of cracking conversion ceramics, and difficult crosslinking, which further leads to the development of high-temperature carbide ceramics. The process in the preparation process is too long and the cost is too high

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