The Effect of Interfacial Chemical Reaction on the Mechanical Properties of Si<sub>3</sub>N<sub>4</sub> Whisker/Al<sub>2</sub>O<sub>3</sub> Composite

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  • AKATSU Takashi
    Materials and Structures Laboratory, Tokyo Institute of Technology
  • YASUDA Eiichi
    Materials and Structures Laboratory, Tokyo Institute of Technology

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  • Si<sub>3</sub>N<sub>4</sub>ウイスカー/Al<sub>2</sub>O<sub>3</sub>複合材料の力学的性質に及ぼす界面化学反応の影響
  • Effect of Interfacial Chemical Reaction on the Mechanical Properties of Si3N4 Whisker Al2O3 Composite

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Abstract

Si3N4 whisker/Al2O3 composites with various amounts of interfacial β-SiAlON (β′-phase, Si6-ZAlZOZN8-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°C were markedly different from those of the composites hot-pressed below 1600°C, because X-phase at the whisker/matrix interface was liquefied during the hot-pressing above 1600°C and vitrified X-phase seemed to increase interfacial bonding strength.

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