公开(公告)号：US3892882A

公开(公告)日：1975-07-01

申请号：US36417173

申请日：1973-05-25

申请人： UNION CARBIDE CORP

发明人： GUEST CHRISTOPHER JOHN SCOTT ,  FORD KEITH GRAHAM

IPC分类号： B05B5/06 ,  B05B7/22

CPC分类号： B05B7/226 ,  B05B5/06

摘要： The invention relates to the production of plasma-sprayed coatings at low surface speeds and long stand off distances e.g. more than 7.5 cm. A zone of sub-atmospheric pressure is maintained through which the hot gas effluent and entrained coating powder produced by a plasma torch is caused to pass on its way to the substrate being coated. The sub-atmospheric zone preferably extends over the whole path of hot gas effluent and entrained coating powder. Apparatus is provided which comprises a plasma torch and a chamber preferably a tube together with means for maintaining a zone of sub-atmospheric pressure in the chamber. In the case of the tube this may be a spiral passage mounted in said tube which injects a sheath of gas moving along the inner surface of the tube in a spiral path.

摘要翻译： 本发明涉及在低表面速度和长距离距离下生产等离子喷涂涂层。 超过7.5厘米。 保持低于大气压的区域，使通过等离子体焰炬所产生的热气体流出物和夹带的涂层粉末通过其进入被涂覆的基材。 次大气区域优选在热气流出物和夹带的涂层粉末的整个路径上延伸。 提供了一种装置，其包括等离子体焰炬和腔室，优选地是管，以及用于保持腔室中的低于大气压的区域的装置。 在管的情况下，这可以是安装在所述管中的螺旋通道，其注入沿着管的内表面沿螺旋路径移动的气体鞘。