METHOD OF PRODUCING CERAMIC ARMOUR MATERIAL BASED ON SILICON CARBIDE AND BORON CARBIDE AND CERAMIC ARMOUR MATERIAL BASED ON SILICON CARBIDE AND BORON CARBIDE

摘要

FIELD: chemistry.;SUBSTANCE: invention relates to production of hard-alloy material, as well as to making protective equipment and can be used to produce armour ceramics. To produce composite material, a mixture is formed from grains of α-crystals of silicon carbide 50-100 mcm - 40-60 pts.wt, grains of boron carbide crystals ≤35 mcm - 40-60 pts.wt and a mixture of bakelite lacquer with isopropyl alcohol - 5-10 pts.wt; a workpiece is pressed and then heat treated to obtain pyrolytic carbon lying between grains of carbides; the workpiece is calcined in a vacuum at temperature 1450-1900°C. The workpiece undergoes silicification with 120-130 pts.wt metallic silicon per 100 pts.wt of the workpiece. During silicification, β-crystals of silicon carbide are deposited on the α-crystals of silicon carbide to 80-150 mcm grains with formation of bridges from β-crystals between silicon carbide grains, and on grains of boron carbide crystals - a shell of silicon, boron silicides and a solid solution of silicon carbide in boron carbide to form bridges from the latter. The obtained ceramic armour material is a double-crystal composite material from reaction bonded grains of α-crystals of silicon carbide, reaction bonded grains of boron carbide crystals and inter-grain silicon phase.;EFFECT: reduced weight of armour material without reducing armour properties, high reliability of the product.;2 cl, 1 tbl, 2 dwg