| 摘要 |
PURPOSE: To improve the utilization efficiency and energy efficiency of a thermal spraying material by forming the cathode of a plasma torch having an anode enclosing the cathode to an annular form and to decrease deviation of spray pattern and to improve use life of electrodes. CONSTITUTION: This plasma torch 100 consists of a cathode block 2 coaxially arranged at the center of a cylindrical housing 1 made of a heat resistance material and a cylindrical anode block 3 held on the inner peripheral wall of this housing 1. A discharge space 4 is formed between the cathode block 2 and the anode block 3. The cathode block 2 has the ring cathode 25 having the ring discharge part. A pipe 5 for supplying the thermal spraying material is coaxially fixed to the center of the ring cathode 25. The anode block 3 consists of the cylindrical anode 34 disposed to enclose the discharge space 4 apart this space between the ring cathode 25 and its discharge part and ring magnets 35, 36 continuously arranged to enclose the discharge space 4 so as to form the magnetic fluxes intersecting with each other within the plane inclusive of the central axis in the discharge space 4. |
