| 摘要 |
PURPOSE:To increase the area of a film formed by means of a single plasma thermal spraying by providing plural injection holes on the injection side of a nozzle part injecting a powdery raw material melted by plasma heat together with plasma jet. CONSTITUTION:In a plasma torch 1 having an anode 20 and a cathode 22, pulse voltage is impressed on this electrode pair to produce plasma. A working gas is sprayed onto this plasma to form a plasma jet 4. A powdery raw material 5 is supplied to this plasma jet 4 through a powder feeding hole 14A, melted by plasma heat, and injected together with the plasma jet 4 through a nozzle part 24, by which a sprayed coating 3 is formed on a solid basis material 2. In the above plasma thermal spraying device, plural injection holes 24A and 24B are provided on the plasma jet 4 injection side of the above nozzle part 24. Further, respective injection holes 24A and 24B mentioned above are provided with powder feeding holes, by which patterns of films composed of mutually different materials can be formed by means of a single plasma thermal spraying. |
