セラミックス-金属接合体の形状の強度に及ぼす影響

概要

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The bonding of ceramics-metal is a useful practical method to take advantage of ceramics properties. However, there are some serious problems, one of which is the thermal stress concentration occurring near the edge of the interface bonding two materials with different thermal expansion coefficients. In this paper, changing the strength of the bonded structure by modifying the shape of metal, which was easy to manufacture, was evaluated by tensile testing. The change of strength of the bonded structure on application of a heat cycle was also evaluated. In addition, the thermoelastic-plastic analysis of residual thermal stresses near the edge of the interface was conducted using the finite-element method (FEM). The contents in this paper were summarized as follows. The bonding strength of Si_3N_4 and Ni can be increased by modifying the edge angle of the metal, and the strength of the joint with an edge angle of 45° was about three times that of 90°. In addition, the result of FEM analysis supported the experimental result of bonding strength. The bonding strength for joints undergoing the heat cycle dropped remarkably with alteration of the thermal stress between expansion and contraction.
一般社団法人日本機械学会の論文
1993-04-25