焼結過程の反応で生成したFe_5Si_3粒子分散Si_3N_4の微細組織

概要

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Details of the microstructure were investigated in Fe_5Si_3-particles-dispersed Si_3N_4 ceramics, synthesized by reaction during sintering. The following results were obtained: 1) the size of most part of Fe_5Si_3 particles was around 2 μm, and those particles had plate-like and roundish form, 2) a linear crack was observed along the boundary between Fe_5Si_3 particles and matrix. The width of the crack was approximately 10-25 nm, and this value was close to a calculated value considering the difference in thermal expansion coefficient of the two phases, 3) at the boundary of Fe_5Si_3 particles and matrix, there existed a glassy phase of about 2 nm in width, Si, Al, Y, O elements being detected in this phase, 4) around the Fe_5Si_3 particles, a Si_2N_2O phase with irregular shape formed; in this phase ultrafine particles with 50-100 nm were incorporated.
社団法人日本セラミックス協会の論文
2003-01-01