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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.
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Details
1 Institute of Silicate Chemistry I.V. Grebenshchikov Russian Academy of Sciences, St. Petersburg, Russia
2 Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow, Russia
3 Physico-Technical Institute A.F. Ioffe Russian Academy of Sciences, St.-Petersburg, Russia
4 St.-Petersburg State Institute of Technology (Technical University), St.-Petersburg, Russia