銀ろうとインサート金属を用いた常圧焼結SiCとステンレス鋼の接合

概要

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Brazing of pressureless-sintered SiC to stainless steel using Ag-28wt% Cu alloy was studied. In SiC plate joined to stainless steel rod (6mm in diameter) using an Ag-Cu alloy powder containing 1.5wt% Ti, the bond strength increased with decreasing brazing temperature and holding time. When the increased size of stainless steel plate (10×10×4mm), joining was unsuccessful by the method mentioned above and even with Ti insert-metal. However, simultaneous use of Ti and Mo as insert-metal gave a good bonding in the order SiC/Ti/Mo/stainless steel, because of relaxation of residual stress due to thermal expansion mismatch. The shear strength was 30-50 MPa. A thin layer, probably Ti_3SiC_2, was observed at the interface between SiC and brazing filler immediately after melting. But with increasing both temperature and time, Ti_5Si_3 (C) and TiC_x were formed if Ti was continuously provided from the brazing filler. Since the interface of Ti_3SiC_2 and either Ti_5Si_3 (C) or TiC_x seemed to be brittle, the formation of Ti_5Si_3 (C) and TiC_x decreased the bond strength. At lower temperature and short time, a high bond strength is expected when Ti was inserted in contact with SiC.
1987-03-01