Abstract
ZrO2–SiC/MoSi2 composite ceramics were prepared by powder metallurgy. The room temperature and high temperature fracture toughness of 10 vol%ZrO2+MoSi2, 10 vol%ZrO2+10 vol%SiC + MoSi2, 20 vol%ZrO2+10 vol%SiC + MoSi2, 10 vol%ZrO2+20 vol%SiC + MoSi2 composite ceramics were studied. The room temperature fracture toughness was calculated by Vickers indentation crack. High temperature fracture toughness is measured by wavefront interference principle of moire interferometry and non-contact measurement of in-plane displacement. The synergistic effects mechanism of nano-ZrO2 and SiC particles on the fracture toughness of MoSi2 nanocomposite ceramics was discussed.
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