The centrifugal combustion synthesis (CCS) process with a thermite-type combustion synthesis reaction can produce a joint of a cast Ni₃Al member and a dissimilar material. We verify effectiveness of filtration of the combustion-synthesized Ni-Al alloy on the distribution of by-product alumina inclusions in the cast member. In the specimen produced without filtration, coarse alumina inclusions were distributed. In contrast, no such a fatal defect was observed in the filtrated specimen.