212 アルミナ/YTZ複合材料の機械的性質に及ぼす組成比の影響

抄録

Microstructural development and mechanical properties of Al_2O_3/YTZ (3mol%Y_2O_3-ZrO_2) composites have been correlated to the kinetic parameters for the initial sintering. For YTZ-rich compositions (YTZ>90vol%), mono-dispersion structure of dispersant particles increased the apparent activation energy. Contrary, for Al_2O_3-rich compositions (YTZ<5vol%), the grain growth of matrix decreased the apparentactivation energy. The linear increment of the apparent activation energy at the range of 20 to 80vol%YTZ is related to the increased probability of neck formation among the second phase particles. The neck formation and growth of dispersant particles progress markedly when the content of the second component becomes 10-20vol%. Vickers hardness also correlated to the development of network structure of the second phase materials.