| 摘要 |
PURPOSE:To form a surface film having superior wear resistance and sliding characteristics by forming a sprayed layer of a WC-(Ni-P) alloy on the surface of a member to be treated, heating the member in a nonoxidizing atmosphere to melt only the Ni-P phase, and solidifying the molten phase. CONSTITUTION:A WC-(Ni-P) alloy for forming a sprayed layer on the surface of a member to be treated is preferably prepd. by coating about 95-70% WC powder of about 20-60mum grain size with about 5-30% Ni-P contg. about 8-13% P by electroless plating. A sprayed layer of the WC-(Ni-P) alloy is formed on the surface of a member to be treated. The member is heated to about 950- 1,050 deg.C in a non-oxidizing atmosphere to melt only the Ni-P phase, and the molten phase is solidified. Ni-P is decomposed at about 400 deg.C, and Ni3P is precipitated, so the hardness of the entire film is increased. |
