Effect of interlayers in ceramic-metal joints with thermal expansion mismatches

The internal stress resulting from the thermal expansion mismatch between alumina and steel with and without an interlayer was evaluated. On the basis of the calculation, alumina and steel were bonded using the interlayer method and hot isostatic pressing at 1273 to 1573 K under 100 MPa for 30 min. When a laminated interlayer (niobiumlmolybdenum) was used, a joint with high bonding strength was obtained.