| 摘要 |
PURPOSE:To line an inner wall of tubular structural body at a high adhesive strength, by providing a thermal spraying head in a tube, closing the tube ends, reducing pressure therein, then subjecting to plasma thermal spraying the tube body while revolving it, and moving the spraying head. CONSTITUTION:In a set composed of the thermal spraying head 2, a power supply source 6, a powder material supplying apparatus 5, a cooling water supplying apparatus 31, a controller 4, the head 2 part is provided in a tubular structural body 1. Both ends of the body 1 are closed with blind covers 7, and the pressure therein is reduced to <=150Torr. Plasma gas is supplied to the head 2, the tube 1 is revolved on a roller 26 to advance plasma thermal spraying in circumferential direction. If a sprayed film 32 is formed to a prescribed thickness on an inner wall 34, the head 2 is moved by a moving pitch of 10-100nm range. |
