Reaction synthesis of silicon carbide-boron nitride composites

Abstract

The present invention relates to a silicon carbide-boron nitride composite material, which synthesised according to an in-situ chemical reaction between silicon nitride, boron carbide and carbon, and which contains fine boron nitride particles dispersed in a silicon carbide matrix, wherein aforementioned composite material is obtained by molding a powder mixture containing each of the components required in the in-situ reaction and sintering the mixture.

What is claimed is:  
     
         1 . A silicon carbide-boron nitride composite material with fine boron nitride particles uniformly dispersed in a silicon carbide matrix, which synthesised according to an in-situ chemical reaction between silicon nitride, boron carbide and carbon, 
 said silicon carbide-boron nitride composite material is produced by molding a powder mixture containing the said components which are required in the in-situ chemical reaction, and sintering the molded mixture to obtain the sintered composite.    
     
     
         2 . A silicon carbide-boron nitride composite material, which synthesised according to an in-situ chemical reaction between at least silicon nitride, boron carbide and carbon, 
 said silicon carbide-boron nitride composite material is produced by molding a powder comprising a silicon carbide, boron nitride or silicon nitride powder being added to a powder mixture containing the said components which are required in the in-situ chemical reaction between silicon nitride, boron carbide and carbon, and sintering the molded mixture to obtain the sintered composite comprising silicon carbide-boron nitride or silicon carbide-silicon nitride-boron nitride in which the phase composition is adjusted as required.    
     
     
         3 . A silicon carbide-boron nitride composite material, which synthesised according to an in-situ chemical reaction between at least silicon nitride, boron carbide and carbon, 
 said silicon carbide-boron nitride composite material is produced by molding a powder comprising a silicon carbide or boron nitride powder being added to a powder mixture containing the said components which are required in an in-situ chemical reaction between silicon nitride, boron carbide and carbon, and sintering the molded mixture to obtain the sintered composite in which the phase composition is adjusted as required.    
     
     
         4 . A method for manufacturing the composite material defined in any one of claims  1  through  3 , which comprises mixing the components which are required in an in-situ chemical reaction between silicon nitride, boron carbide and carbon, adding further as required, at least one component selected from among silicon carbide, boron nitride or silicon nitride thereinto, molding the mixture, and sintering the molded mixture to manufacture a silicon carbide-boron nitride composite material or a silicon carbide-silicon nitride-boron nitride composite material.