A kind of preparation method of densified silicon carbide matrix composite material

Abstract

The invention discloses a preparation method for a densified silicon carbide based composite material, and belongs to the technical field of material preparation. The preparation method comprises: by taking carbon nano particles and silica powder as raw materials and due to a mechanical force chemical effect, preparing silicon carbide / carbon composite powder; ball-milling, mixing and pulping the silicon carbide / carbon composite powder, ethanol solution, tetramethylammonium hydroxide, and carboxymethylcellulose, and spraying and drying the mixture, thereby obtaining spherical particles; uniformly mixing the spherical particles with aluminum oxide and zirconium dioxide, putting the mixture in a mould, pressing the mould to form blanks, uniformly spraying glaze slurry prepared by uniformly mixing calcium carbonate powder, cordierite powder and water on the surfaces of the blanks, and drying and burning the treated blanks, thereby obtaining the densified silicon carbide based composite material. Therefore, a defect that the traditional silicon carbide based composite material is easy to generate low-temperature cracks is solved; the glaze slurry permeates into holes, so that the void fraction is reduced; and then the composite material is greatly densified, and an excellent use value is achieved.

Description

technical field [0001] The invention discloses a method for preparing a densified silicon carbide-based composite material, which belongs to the technical field of material preparation. Background technique [0002] With the development of new engines and the development of new concept space vehicles, higher requirements are put forward for high temperature structural materials. Fiber-reinforced ceramic matrix composites have excellent properties such as high strength, high toughness, high temperature resistance, good corrosion resistance and low density at high temperatures, and have broad application prospects in the fields of strategic weapons and space technology. In recent years, more and more By the attention of material workers. In the fields of national defense and aerospace, silicon carbide matrix composites show broad application prospects in new aerospace vehicles and other aspects. In civil fields such as transportation and new energy, nuclear fusion plasma pow...

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the present invention: In view of the defect that the matching degree between the carbon fiber and the silicon carbide matrix is ​​not high in the current traditional silicon carbide-based composite materials, resulting in cracks often appearing at low temperature, the present invention uses carbon nanoparticles and silicon micropowder as raw materials, and uses Silicon carbide / carbon composite powder is prepared by mechanochemical effect, and mixed with ethanol solution, tetramethylammonium hydroxide, and carboxymethyl cellulose for ball milling and pulping, and after spray drying, spherical particles are made with alumina, Mix zirconia and place it in a mold, press it into a green body, and evenly spray the glaze slurry prepared by crushing calcium carbonate, cordierite, etc., and mixing it with water on the surface of the green body, dry and calcined to obtain a densified silicon carbide matrix The composite material solves the defect that the traditional silicon carbide composite material is prone to low-temperature cracks, and the glaze slurry penetrates into the pores, reducing the porosity and making the composite material more dense, with excellent use value