| 摘要 |
PURPOSE:To obtain a thermally sprayed film having good quality by sufficiently executing melting of thermally sprayed powder particles with high adhesion efficiency. CONSTITUTION:While the atmosphere pressure is kept under 20 to 500Torr, a plasma jet 25 to be injected from a plasma thermal spraying torch 22 toward a base material 23 is formed and, thereafter, the thermally sprayed powder particles 24 are supplied into the plasma jet 25 via a powder supplying pole 22a' penetrating the axial center of a cathode 22a of the plasma thermal spraying torch 22, by which the plasma jet 25 is formed with adequate spread and, therefore, uniform heating and accelerating of the thermally sprayed powder particles 24 are made possible. Since the thermally sprayed powder particles 24 are supplied along the injection direction of the plasma jet 25, the efficient heating and accelerating are made possible. Thus thermally sprayed films having excellent wear resistance, corrosion resistance and oxidation resistance are obtd. and the deposition efficiency of the thermally spraying material is improved. Shortening of the working stages and the reduction of material cost are made possible. |
