FRACTURE BEHAVIOUR OF Si_3N_4-ZrO_2CERAMIC COMPOSITE
QI Peiyi; XIA Fei; ZHOU Yanchun(Institute of Metal Research; Academia Sinica; Shenyang) (Manuscript received 5 May; 1986; revised manuscript 20 November. 1986)
Cite this article:
QI Peiyi; XIA Fei; ZHOU Yanchun(Institute of Metal Research; Academia Sinica; Shenyang) (Manuscript received 5 May; 1986; revised manuscript 20 November. 1986). FRACTURE BEHAVIOUR OF Si_3N_4-ZrO_2CERAMIC COMPOSITE. Acta Metall Sin, 1987, 23(3): 301-320.
Abstract The fracture behaviour of tetragonal ZrO_2 toughened Si_3N_4 ceramic composite has been investigated using acoustic emission technique, X-ray diffraction, SEM and TEM. The results show that the fracture toughness increased markedly by addition of t-ZrO_2. The t-ZrO_2 particles show a considerable resistance to transformation. It is considered that the toughening mechanism of t-ZrO_2 addition might be crack deflection, crack branching and microcrack toughning.
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