CU-NI SERIES ALLOY POWDER AND MANUFACTURE THEREOF

摘要

PURPOSE:To give excellent wear resistance and corrosion resistance to Cu-Ni-Al alloy powder by oxidizing the Cu-Ni-Al alloy powder at high temp. and successively, reducing it at low temp. CONSTITUTION:The Cu-Ni-Al alloy raw material powder composed of wt.% of 1.5-10% Al, 1-45% Ni and the balance Cu with inevitable impurities is heated and held at 700-1100 deg.C in an oxidizing atmosphere and oxidized desirably in powder fluidizing condition. By this treatment, oxide powder having structure, in which cyclic complex oxide phase aggregated with fine (Cu, Ni, Al) O as ring-state exists between the powder center part and the powder peripheral part in all cross section passing the powder center part in matrix composed of (Cu, Ni) O as essential body, is formed. The above oxide powder is heated and held at 200-450 deg.C in a reducing atmosphere to execute the reducing treatment and the matrix in the oxide powder is substantially made to Cu-Ni or Cu-Ni-Al alloy and also the cyclic complex oxide phase is made to ring hardened phase containing fine Al2O3 as essential body.