Production of Ceramic Materials Based on SiC with Low-Melting Oxide Additives

Resumo

Dense materials based on silicon carbide were obtained by liquid-phase sintering. The oxides MgO, Y₂O₃ , and Al₂O₃ , corresponding to the composition of yttrium-aluminum garnet and the triple eutectic point on the line of binary sections garnet-spinel, were used as the sintering additive. The oxides were deposited on the surface of powder by the SiC method of coprecipitation from a solution of salts. The maximum density (ρ_rel = 99.5%) was attained on SiC materials which include 20% (by weight) sintering additives consisting of a three-component oxide mixture at temperature 1800°C.