| 摘要 |
PURPOSE:To obtain an Al alloy member having excellent wear resistance by forming the composite phase consisting of an Ni-Al intermetallic compd. phase and hard carbide phase on the surface of an Al alloy base material in a desired part and specifying the concns. of the Ni and hard carbide layer in the composite phase. CONSTITUTION:The mixture composed of 1 or >=2 kinds of the hard carbides selected from TiC, WC, VC, ZrC, NbC and TaC and Ni is thermally sprayed onto the surface of the Al alloy base material in the position where the wear resistance is required to coat said surface. High-density energy such as TIG arc is then irradiated to said surface to heat quickly the surface for a short period and to melt and alloy part of the Ni+hard carbide coating layer and the Al alloy base material on the underside thereof by which the composite phase consisting of the Ni-Al intermetallic compd. phase and the hard carbide phase is crystallized in the Al alloy matrix. The conditions for irradiating the high-density energy are adequately set so that the average concn. of Ni in the composite phase attains 10-20wt% and the average concn. of the hard carbide phase attains 0.5-30wt%. |
