構造用セラミックスの高温強度特性 : 破壊じん性と平滑材の強度の相関
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Flexural strength tests and fracture toughness tests on two kinds of ceramics (silicon nitride and silicon carbide) were carried out by four-point bending at room temperature and elevated temperatures. The fracture tough ness was measured by using the chevron-not ched specimen Sand by using the contrrolled surface saw specimens which have a sem circular surface crack induced by a knoopdenter. Further more, the fracture tougnness of smooth specimen was evaluated by using which is the square root of the area of the defect projected to the direction of the principals tress. Thesere sult were discussedirl comparison With the fracture toughness values obtained by the chevron-notched specimens and the controlled surface flaw specimer. The results obtaind as follows : (1) The fracture toughness values depended on the method of measurement. The values of silicon nitride d e an silicon carbide obtained from the chevron-notched specimens were higher than those obtained from the controlled surface flaw specimens at elevated temperatures (2) The fracture toughness values of silicon nitride obtained from the controlled surface flaw specimens decreased rapidly when the temperature exceeded 1000℃. It was clear that its rapid de-crease was caused by slow crack growth (3) The fracture toughness values of silicon carbide obtained from the controlled surface flaw specimens were influenced by the healing of crack at about 1200℃ (4) The temperature dependency of the fracture toughness value of silicon nitride obtained from the smooth specimens coincided with that of the fracture toughness obtained from the controlled surface flaw specimens.
- 社団法人日本材料学会の論文
- 1991-04-15
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