| 摘要 |
PURPOSE:To form easily a wear-resistant coating at a high product yield by sticking metallic powder consisting principally of Ni and Cr or further Co in addition thereto and contg. B, Si, Fe and C on the surface of a metallic body and heating the same to melt. CONSTITUTION:A metallic powder layer 5 consisting principally of Ni and Cr or Cr, Co and Ni, contg. B, Si, Fe and C as essential components and added with Mo, W, WC, etc. according to need is formed by a tacky adhesive agent or a thermal spraying method, etc. on the inside surface of a cylindrical metallic body 4 of a spacer, etc. for the control rod of a boiling water reactor and the metallic body is placed on a freely vertically movable and rotatable supporting base 1 in a vessel 8 for atmosphere. The above-mentioned metallic body 4 is kept rotated or moved upward and is heated to melt the metallic powder layer with the arc heat by an electrode 3 for arc as a heat source in a vacuum or inert atmosphere of Ar, etc. A wear-resistant coating is formed at a high product yield on the body 4 with the short treating stage by the above-mentioned treatment. |
