SiC/Si_3N_4複合材の機械的特性に及ぼす出発原料の影響

概要

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Mechanical properties of SiC-particle/Si_3N_4 composites produced from two types of starting powders were investigated. Composites fabricated from the Si_3N_4 powder prepared by nitridation of Si showed a 40% increase in bending strength resulting from greater fracture toughness. In contrast, composites made from Si_3N_4 powder obtained by thermal decomposition of Si (NH)_2 exhibited increase in only bending, strength. The latter composites contained SiC particles, which inhibited grain growth of β-Si_3N_4. These differences are attributed to the effect of carbon and oxygen in the starting powders on the sinterability of β-Si_3N_4. The SiC additive and impurities in the starting powders are responsible for the difference in the sintering behavior ofβ-Si_3N_4, and thereby resulting in different mechanical properties.
社団法人日本セラミックス協会の論文
1992-04-01