Silicon-boron-carbon-nitrogen-zirconium ceramic composite material and preparation method thereof

Abstract

The invention discloses a silicon-boron-carbon-nitrogen-zirconium ceramic composite material and a preparation method thereof. A sol-gel liquid adopts zirconium n-propoxide, acetylacetone and anhydrous ethanol as raw materials. Zirconium n-propoxide is the precursor of zirconium oxide, and can be subjected to a gel reaction with acetylacetone, while ethanol is a solvent. Silicon powder, graphite and hexagonal boron nitride are the raw materials for silicon-boron-carbon-nitrogen ceramic composite powder. The preparation method comprises the following steps: zirconium n-propoxide and acetylacetone are subjected to magnetic stirring for 48h in an anhydrous ethanol solution, such that a gel solution is formed; the silicon-boron-carbon-nitrogen ceramic composite powder is mixed with the solution according to a certain ratio; magnetic stirring is carried out for 48h, and the obtained material is dried; cracking is carried out for 3h under a temperature of 550 DEG C in a tubular furnace, such that a silicon-boron-carbon-nitrogen-zirconium oxide ceramic composite material is obtained. The powder is subjected to pressurized sintering under a temperature of 2000 DEG C in discharge plasma, such that in-situ reaction sintering is carried out. The silicon-boron-carbon-nitrogen-zirconium ceramic composite material synthesized with the method provided by the invention has the advantages of high interfacial bonding strength and good comprehensive performance. The material is especially suitable to be used for manufacturing aerospace heat-proof core components.

Description

technical field [0001] The invention relates to a silicon-boron-carbon-nitrogen-zirconium ceramic composite material and a preparation method thereof, and belongs to the technical field of silicon-boron-carbon-nitrogen-based ceramic composite materials and preparation methods thereof. Background technique [0002] The covalent bond structure of the silicon-boron-carbon-nitrogen ceramic composite material itself endows it with high thermal stability, high temperature oxidation resistance, high temperature creep resistance, etc., and it has the advantages of low density and low elastic modulus. It is a new type of Multi-functional high-temperature heat-resistant materials for spacecraft nose cones, wing leading edges, rudder surfaces, covers and nozzles, etc. However, the high covalent bonding of ceramic itself makes it an inherently brittle material, which is prone to defects during use and leads to catastrophic failure, which limits its application to a certain extent. [0...

AI Technical Summary

Problems solved by technology

However, the high covalent bonding of ceramic itself makes it an inherently brittle material, which is prone to defects during use and leads to catastrophic failure, which limits its application to a certain extent.

Images