Lining of light metals with hard powders using shot peening

A lining of light metals with hard powders using shot peening was carried out. The hard powders are bonded to the surface of the workpieces due to the collision with many shots. To fix the hard powders on the surface of the workpiece, the powder is placed on the uneven surface, and the surface is covered with a pure aluminium foil during the shot peening. To make the fixing of powders easy, the lining of workpiece with the powders sandwiched in between two aluminium foils was also tried. In this experiment, a centrifugal shot peening machine with an electrical heater is employed. The workpieces are aluminium and magnesium alloys, and the hard powders are commercially pure chromium, ceramics and cemented carbide. The effects of collision speed and the processing temperature on the bondability were examined. The wear resistance was evaluated by wear test. The hard powders are successfully bonded over the surface of workpieces by raising the processing temperature.