Method for preparing reaction-sintered grouting-formed silicon carbide ceramics

Abstract

The invention discloses a method for preparing reaction-sintered grouting-formed silicon carbide ceramics. Two kinds of silicon carbide micro-powders which are produced by a jet mill and which are saturated by particle shaping have a particle diameter of 50 [mu]m and 5 [mu]m, and the relative blending ratio ranges from 1:1 to 10:1, pigment carbon black or metallurgical carbon black with a particlesize of 20 nm to 100 nm is taken as a carbon source, the ratio of addition is 1% to 15%, novel high-efficiency binders are adopted and are multiple or all of a group consisting of acrylamide, polyvinylpyrrolidone, polycarboxylic acid, polyvinyl formal, amino ethanol, tetramethylammonium hydroxide, maleic anhydride and polyacrylic acid, and deionized water in a volume ratio of 10% to 40% is adopted. By controlling the suitable silicon carbide raw material particle size and particle size grading, the suitable proportion of carbon and the suitable binders, the carbide ceramics which are low in free silicon residue uniformly distributed, are basically free of free carbon and have high product density and product strength can be prepared, and the reaction-sintered grouting-formed silicon carbide ceramics can be applied to the fields such as lightweight armor, aerospace materials, and reactor vessels.

Description

technical field [0001] The invention belongs to the technical field of silicon carbide ceramics preparation, and in particular relates to a preparation method of reaction sintering grouting molding silicon carbide ceramics. Background technique [0002] Reaction sintered silicon carbide ceramics is an advanced high temperature and corrosion resistant structural ceramics. Compared with other ceramics, it has the characteristics of short sintering time, compact structure and high bearing capacity, and can withstand high temperature environments. The slip casting method can produce complex shapes and can achieve the characteristics of near-static sintering, so it is a technology with great application prospects. It is usually used in lightweight armor, aerospace materials, and reactor vessels. [0003] The general production method is to mix α-Sic and carbon powder, pour them into a green body under the action of a binder, and then carry out silicon infiltration and sintering w...

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Problems solved by technology

[0004] Through inquiry, no application similar to the present invention was found, only two of which have similar purposes, among which the Chinese invention patent application with publication number CN107500795A uses a carbon fiber reinforced method, and the Chinese invention patent application with publication number CN107353009A , which adopts the method of graphene multiphase toughening, both methods are feasible, but the production cost is greatly increased, and the production difficulty is also much greater