X-Ray Stress Measurement of Ni-AI system Coating Layer Prepared by Self-Propagating High-Temperature Synthesis Reaction

摘要

Ni-AI intermetallic compound is difficult to produce due to its high melting point, but can be produced usually the combustion synthesis reaction method called the SHS method. We made Ni-Al coating material on metal substrate using this technique, which generated residual stress generated near coating-substrate interface, due to the difference in component mechanical properties. In this study, the X-ray (sinψ)~2 technique was applied to study the, influences of coating thickness and substrate material property on the residual stress in the Ni-AI coating layer. As expected the level of residual stress caused by difficultly due to the differential mechanical properties between coating and substrate affects the joining quality. These residual stresses are generated during preparation by difference in the coefficient of thermal expansion between coating layer and substrate.