Si_3N_4ウイスカー/Al_2O_3複合材料の力学的性質に及ぼす界面化学反応の影響

概要

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Si_3N_4 whisker/Al_2O_3 composites with various amounts of interfacial β-SiAlON (β'-phase, Si_<6-Z>Al_ZO_ZN_<8-Z>) were prepared while controlling the hot-pressing temperature and duration. X-ray diffraction analysis revealed that interfacial chemical reaction produced X-phase and β-SiAlON with a Z-value of approximately 4. A model of the interfacial chemical reaction was proposed to explain the experimental results. The mechanical properties of the composites hot-pressed above 1600℃ were markedly different from those of the composites hot-pressed below 1600℃, because X-phase at the whisker/matrix interface was liquefied during the hotpressing above 1600℃ and vitrified X-phase seemed to increase interfacial bonding strength.
社団法人日本セラミックス協会の論文
1996-11-01