Liquid-sintered SiC based materials with additive low oxide oxides

Abstract

By the method of free liquid-phase sintering, dense materials based on silicon carbide (P ≤ 0.5%) were obtained. In the preparation of charge powders, the method of co-precipitation of oxides on silicon carbide powder was used. As a sintering additive, a eutectic mixture of the components MgO, Y2O3, and Al2O3 was used, corresponding to the composition on the garnet-spinel line. The resulting materials have a high level of mechanical properties: E = 410 GPa; σ = 680 MPa; K 1C = 6.0 MPa∗m1/2; HV = 21.5 GPa, approaching the level of properties of hot-pressed silicon carbide materials.