| 摘要 |
PURPOSE:To prevent the decomposition of WC damaging the wear resistance of sprayed deposit and to permit continuous driving for long time. CONSTITUTION:In a method for plasma-spraying tungsten carbide in which a plasma flame 73 obtd. by heating gases 56, 86, 62 and 88 by an arc 67 is fed with granular tungsten carbide 70, which is melted, and the molten drops 71 are ejected on a base metal 75 to form a sprayed deposit 74 on the surface of the base metal, the arc 67 is formed between a main torch 51 and a subtorch 52 and the turning flow of a plasma gas is formed around the arc 67 as well as the enthalpy of the plasma flame 73 is regulated to a low one of 0.5 to 1.8X104 Ki/Kg. |
