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1. 发明授权

US5858469A Method and apparatus for applying coatings using a nozzle assembly having passageways of differing diameter 失效
标题翻译：使用具有不同直径通道的喷嘴组件涂覆涂层的方法和装置
公开(公告)号：US5858469A
公开(公告)日：1999-01-12
申请号：US564915
申请日：1995-11-30
申请人： Purusottam Sahoo , Stephen G. Sitko
发明人： Purusottam Sahoo , Stephen G. Sitko
IPC分类号： B05B7/22 , C23C4/12 , C23C4/10 , B05B1/24 , B05C5/04
CPC分类号： B05B7/226 , C23C4/134
摘要： Known thermal spray apparatus are modified to achieve thermal spray coatings of increased hardness. Thermal spray apparatus operate to develop a plasma stream for introduction to a nozzle, for eventual application to the surface of a substrate. Upon entering the nozzle, the plasma stream is passed through a plasma cooling zone defined by a plasma cooling passageway, to a plasma accelerating zone defined by a narrowed passageway that expands into a plasma/particle confining zone for the discharge of material from the apparatus. The narrowed passageway of the apparatus is cooled, and the powder material to be applied by the apparatus is introduced into the plasma stream along the cooled, narrowed passageway. To apply thermal spray coatings of increased hardness to a substrate, the ratio of the length of the plasma/particle confining zone relative to the diameter of the plasma/particle confining zone (the "L/D" ratio) is increased from the more conventional value of about 5:1, preferably to a ratio in a range of from 7:1 to 16.5:1, for use with coating materials including WC--Co, Cr.sub.3 C.sub.2 --NiCr and Cr.sub.3 C.sub.2. Ratios of from 10:1 to 13:1 have been found to achieve a particularly desirable result. Also the method and the coatings obtained.
摘要翻译：修改已知的热喷涂设备以实现增加硬度的热喷涂。热喷涂装置用于开发用于引入喷嘴的等离子体流，以最终施加到基板的表面。在进入喷嘴时，等离子体流通过由等离子体冷却通道限定的等离子体冷却区域到由扩大成等离子体/颗粒限制区域的狭窄通道限定的等离子体加速区域，以从装置中排出材料。将设备的狭窄通道冷却，并将由设备施加的粉末材料沿冷却的狭窄通道引入等离子体流中。为了将具有增加的硬度的热喷涂涂层施加到基材上，等离子体/颗粒约束区域的长度相对于等离子体/颗粒约束区域的直径（“L / D”比）的比率从更常规的值为约5：1，优选为7：1至16.5：1的比例，用于包括WC-Co，Cr3C2-NiCr和Cr3C2的涂层材料。已经发现10：1至13：1的比例达到了特别理想的结果。还可以获得方法和涂层。

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