Cold model for process of a Ni-aluminide/steel clad pipe by a reactive centrifugal casting method

A novel method (reactive centrifugal casting method) to fabricate a Ni-aluminide/steel clad pipe has been proposed. Ni powder was placed on a spinning steel pipe, and Al liquid was poured into the steel pipe. The Al liquid and Ni powder exothermically reacted and produced a composite layer consisting of Ni-aluminides on the inner surface of the steel pipe. The heat generated by the exothermic reaction melted the inner surface of the steel pipe and bonded the composite layer to the steel. However, during the process, the Ni powder moves along the flow of the Al liquid. In this study, in order to obtain a better understanding of the Ni powder motion in the spinning steel pipe, a cold model centrifugal casting is employed. We focus on the effects of the angle between the spinning and horizontal axes on the type of centrifugal casters, because it is difficult to obtain the same data by the proper experiments.