Bonding Ceramics to Metal by Discharged Plasma Heating

Crack propagates in ceramic when extensive residual stress generates in ceramic at joint of ceramicLow temperature and soft metal(Ag,Cu) inserted bonding are effective for reduction ofresidual stress. Discharged plasma heating is applied for low temperature bonding and Ag,Cu are usedfor soft metal inserted bonding. Boding test Al - D22 - D2 O - D23 - D2 Si - D23 - D2 N - D24 - D2 toγ-stainless steel by this proposed bonding was done. Main results obtained are as follows:(1) Crackpropagates usually in ceramic at conventional bonding(Ag-Cu-Ti direct brazing).This crack wasprevented perfectly by proposed bonding. 2 . Residual stress in ceramic was analyzed by Thermo-elasto-plastic analysis by FEM. It was conventional that residual stress in ceramic at conventionalbonding was equivalent to基本ceramic and reduced to 23-50% by proposed bonding.它是(3) Joint that prevention of crack is due to this residual stress in ceramic.(3) Joint4点bending test.Excellent strength was 4点bending test.Excellent strength wasobtained。

Crack propagates in ceramic when extensive residual stress generates in ceramic at joint of ceramic to metal. Low temperature and soft metal(Ag,Cu) inserted bonding are effective for reduction of residual stress. Discharged plasma heating is applied for low temperature bonding and Ag,Cu are used for soft metal inserted bonding. Boding test AlィイD22ィエD2 O ィイD23ィエD2 SiィイD23ィエD2 N ィイD24ィエD2 to γ-stainless steel by this proposed bonding was done. Main results obtained are as follows :(1) Crack propagates usually in ceramic at conventional bonding(Ag-Cu-Ti direct brazing).This crack was prevented perfectly by proposed bonding.(2) Residual stress in ceramic was analyzed by Thermo- elasto-plastic analysis by FEM. It was confirmed that residual stress in ceramic at conventional bonding was equivalent to strength of base ceramic and reduced to 23-50% by proposed bonding. It is assumed that prevention of crack is due to this reduction of residual stress in ceramic.(3) Joint strength of proposed bonding was investigated by 4-point bending test.Excellent strength was obtained.