Preparation method of SiC fiber-reinforced SiC ceramic-based parts and product

Abstract

The invention belongs to the field of preparation of SiC ceramic-based parts, and discloses a preparation method of SiC fiber-reinforced SiC ceramic-based parts and a product. The preparation method comprises the following steps: (a) mixing a thermoplastic phenolic resin, silica powder and silicon carbide fibers to form a mixed solution; (b) treating the mixed solution to obtain composite powder;performing incremental material manufacturing on the composite powder to form a primary body, and performing pyrolysis carbonization on the primary body to obtain preform; (c) infiltrating the preformin a thermosetting phenolic resin solution, curing, and performing pyrolysis carbonization again to form a novel preform; (d) repeating the step (c) again and again to obtain the final preform, reacting and sintering the final preform, reacting carbon in the preform with silicon to produce silicon carbide, thereby obtaining the SiC ceramic-based parts containing silicon carbide fibers. Accordingto the preparation method disclosed by the invention, the SiC fiber-reinforced SiC ceramic-based parts of complicated structures are obtained by near-net forming, the density is high, and the bindingforce is strong.

Description

technical field [0001] The invention belongs to the field of preparation of SiC ceramic base parts, and more specifically relates to a preparation method and product of SiC fiber reinforced SiC ceramic base parts. Background technique [0002] SiC is a material with excellent performance, stable chemical properties, high thermal conductivity, small thermal expansion coefficient, good wear resistance, and light transmission. It is widely used in abrasives, wear-resistant agents, abrasive tools, high-temperature refractory materials, fine ceramics, etc. SiC fiber is a high-performance ceramic material, which can be divided into whiskers and continuous fibers in terms of morphology. It has the advantages of high temperature oxidation resistance, high hardness, high strength, high thermal stability, corrosion resistance and low density, so it is used in aerospace , Military weapons and equipment and other high-tech fields have attracted much attention. The common application is...

AI Technical Summary

Problems solved by technology

It is difficult to make ceramic parts with large and complex structures by traditional methods, and some parts cannot even be manufactured

3D printing, as a method of layer-by-layer additive manufacturing, is very suitable for forming parts with complex structures. However, ceramics have high melting temperature and high brittleness. Direct laser melting will result in large stress and cracks in the obtained parts.

[0004] CN201710238622.1 discloses a preparation method of C / C-SiC composite parts and its products. The method adopts the method of solvent evaporation to obtain carbon fiber resin, adopts 3D printing technology to obtain the initial blank, and performs siliconizing treatment after carbonization treatment. Subsequently, SiC ceramic parts were obtained by chemical vapor deposition method. However, in this method, the gap between carbon fiber and resin is large, the bonding strength is not enough, and the carbon fiber as the substrate will react with silicon, and the density and strength of the part are not high enough.

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