セラミックス/金属接合材の曲げ強度に及ぼす切断加工と寸法の影響

概要

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Bending tests were performed for Si_3N_4-S45C(a carbon steel) joints with a copper sheet as the interlayer and with Ti-Ag-Cu as the brazing filler. To examine the size effects, some various-sized as-jointed specimens were cut into smaller specimens. Test results were interpreted in terms of residual stress due to jointing measured by the X-ray method. Redistributed residual stress after cutting is essentially similar to those of as-jointed specimens with the same dimensions. A stable crack tends to initiate at the interface between Si_3N_4 and brazing filler metal. After some growth, it advanced into Si_3N_4, which resulted in unstable fracture. With broader specimen width, the initiation site shifts to the interface at the specimen edge and this results in the higher bending strength. In this typical type of failure, the bending strength can be successfully evaluated from the stable crack length, the fracture toughness of monolithic Si_3N_4, and the residual stresses.
一般社団法人日本機械学会の論文
1994-01-25