セラミックス/金属接合材の破面解析とき裂進展の評価
1997 年 46 巻 8 号 p. 952-956
詳細
1997 年 46 巻 8 号 p. 952-956
Four point bending tests on Si3N4/SUS304 joints after thermal cycling were conducted and their fracture surfaces were examined by a fractographic method. Based on these results, the fracture path and the criterion for unstable fracture are discussed by a interface fracture mechanics approach. A crack initiates in the ceramic side very close to the ceramic/brazing filler interface; the unstable fracture occurs when K1 of the subinterface crack reaches KIC for the ceramic material. Consequently, strength degradation during thermal cycling is caused by micro-cracking.
