セラミックス/金属接合構造体の強度信頼性評価 : 接合冷却過程での熱応力および残留応力挙動における基礎的検討

概要

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A simple analysis method was developed by making well use of finite element method(FEM)program for general purposes.The temperature dependence of mechanical properties for every material consisting of ceramic/metal jointing was considered in this method.Using this method, the residual stresses producing during the jointing process were analyzed for Si_3N_4/SUS304 joints with the insert layer of Cu made by an active metal brazing (Ti-Ag-Cu)method so as to clarify the residual stress behavior due to the creep of Cu.The equivalent normal stress calculated from the multi-axial stress was used to evaluate the strength of fracture which resulted from initial flaws existing in the ceramic side.From the analytical results, it is found that the temperature at which the residual stress begins to generate is about 550℃, and it is clarified that the creep of Cu layer during cooling process may relax the residual stress in ceramics side and can not be neglected for the estimation of ceramic fracture due to residual stress.
社団法人日本材料学会の論文
2000-04-15