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The effect of the addition of Y2O3-Al2O3 additive on the phase formation and densification process of in situ SiC-BN composite has been investigated. The in situ reaction started at 1450°C despite the addition of Y2O3-Al2O3 additive. However, when Y2O3-Al2O3 was added the reaction was much faster and completed after hot pressing at 1700°C. In addition, dense material with well-crystallized SiC and BN grains could be obtained. It was found that denitrification occurred during the reaction process for both specimens with and without Y2O3-Al2O3 additive. However, denitrification occurred continuously at temperatures higher than 1700°C for the specimen without Y2O3-Al2O3 additive and eventually resulted in decrease of nitrogen content. The above results were explained based on the following mechanism, that is, the Y2O3-Al2O3 additive formed a Y-Al-Si-O liquid phase with SiO2 present in Si3N4 raw powder, enhancing diffusion of the elements of the reactants.

Eftect of Y2O3-Al2O3 Additive on the Phase Formation and Densification Process of In Situ SiC-BN Composite.