Lining of hydraulic cylinder made of cast iron with copper alloy

A process to line a hydraulic cylinder made of cast iron with copper alloy is developed. In this process, the hollow cylinder was first filled with FeO powder and was heated at a high temperature, which resulted in the removal of the carbon atoms at the cast iron surface that was in contact with the FeO powder. After the FeO powder was brushed away, molten copper alloy was poured into the hollow cylinder held at a high temperature. After cooling, the embedded copper alloy was drilled along its center axis so that the prescribed thickness of the copper alloy may remain. In this study, the temperature and duration of the heat treatment for the decarburization were investigated. The rate of decarburization and the break test of the junction between the copper alloy and the cast iron are discussed.