摩擦圧接によるアルミナ異種接合特性に及ぼす微視組織と残留応力への影響

抄録

Although friction welding has already been used widely for industrial parts, reports of ceramics joining hardly can be seen because ceramics are fragile easily and are difficult to process. Therefore, it is possible to reduce costs by joining with relatively inexpensive common metals by friction welding since ceramics are expensive. Namely, It is realistic to use only a part to need ceramics partially.

In this study, Al2O3 round bar and Aluminum casting alloy (AC8A) round bar were joined by friction welding for the first time. AC8A is typical piston material, and the material were treated by the heat treatment T6. Parameter of Joining condition is only friction time(2,4,10 and 15s). The microstructure at the interface region of joined materials was observed by SEM. The residual stresses due to the friction at the weld interface were measured by Raman spectroscopy method. From these results, 1) In the case of 15s, chemical elements O and Si cross over to the other material respectively by atom diffusion. 2) The longer the friction time, the smaller the standard deviation of the Raman’s shift at the weld interface. It seems that there is a possibility that the friction welding time is correlated to the residual stresses.