ホットプレス法によるAl₂O₃/SiCウイスカー/TiCナノ複合材料

抄録

The influence of addition of fine TiC particles on the mechanical properties of Al₂O₃ matrix composites with 20wt% SiC whisker fabricated by hot-pressing was studied. With increasing TiC content up to 4wt%, the flexural strength and the fracture toughness at room temperature increased. The maximum values of 1200MPa and 7.5MPa⋅m^1/2, respectively, were obtained at a TiC content of 4wt%. Transmission electron microscopic observations indicated that the TiC particles were dispersed not only at the grain boundaries but also within Al₂O₃ grains, and SiC whiskers were located at the grain boundaries. SEM observations showed that the abnormal grain growth of Al₂O₃ was inhibited by TiC particles.