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

A ceramic composite material, silicon boron carbon nitride zirconium technology, applied in the field of silicon boron carbon nitride based ceramic composite material and its preparation, can solve the problems of damage, easy to produce defects, limited application scope and the like, achieve simple process and short preparation period , the effect of good comprehensive performance

CN105948748AActive Publication Date: 2016-09-21HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-09-21

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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.
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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...

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Embodiment Construction

[0016] The present invention will be described in further detail below: the present embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation is provided, but the protection scope of the present invention is not limited to the following examples.

[0017] A silicon-boron-carbon-nitrogen-zirconium ceramic composite material involved in this embodiment is made of zirconium n-propoxide, acetylacetone, absolute ethanol, boron nitride powder, silicon powder and graphite powder, the zirconium n-propoxide, The molar ratio between acetylacetone and absolute ethanol is 1:2:10, and the molar ratio of boron nitride powder, silicon powder and graphite powder is 2:1:3.

[0018] A preparation method of silicon boron carbon nitrogen zirconium ceramic composite material,

[0019] Step 1. Mix zirconium n-propoxide, acetylacetone and absolute ethanol to prepare a sol solution and stir it magnetically; the molar ratio of zirconium n-...