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公开(公告)号：US4740112A
公开(公告)日：1988-04-26
申请号：US412003
申请日：1982-08-27
CPC分类号： B05B7/1404 , B01F3/06
摘要： A powder feed control system employs an arrangement of conduits and valves for selectively directing a gas flow either through a powder feeder or through a bypass so as to quickly and precisely control the introduction of powder into and the removal of powder from the gas flow in a plasma spraying system. The arrangement of conduits and valves includes a two-way solenoid operated valve for directing the gas flow either into a powder feeder through a main conduit or into a bypass conduit which rejoins the main conduit on the other side of the powder feeder at a powder shutoff valve and a bypass and check valve. The bypass and check valve insures that the gas flow in the bypass conduit flows to the output rather than upstream to the powder shutoff valve. The powder shutoff valve includes a resilient member mounted within the bore of a housing and collapsible upon itself to close off an internal bore therein in response to the introduction of pressurized gas into a space between the housing bore and the resilient member. Air introduced into a cannister in the powder feeder with the loading of powder into the cannister is removed by an arrangement which includes a valve for selectively coupling the inside of the cannister to a vacuum source.
摘要翻译： 粉末进料控制系统使用导管和阀的布置，用于选择性地将气流引导通过粉末进料器或通过旁路，以便快速且精确地控制粉末的引入和从气流中去除粉末 等离子喷涂系统。 导管和阀的布置包括双向电磁阀，用于将气流引导通过主导管或粉末供给器进入旁路导管，该旁路导管以粉末截止状态在粉末供给器的另一侧重新连接主导管 阀门和旁路和止回阀。 旁通阀和止回阀确保旁路管道中的气体流量流向输出而不是粉末截止阀的上游。 粉末截止阀包括安装在壳体的孔内并可折叠在其上的弹性构件，以响应于将加压气体引入壳体孔和弹性构件之间的空间而关闭其中的内部孔。 通过包括用于选择性地将罐的内部耦合到真空源的阀的装置，将引入粉末进料器中的料筒的空气通过将粉末装载到罐中而被去除。
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公开(公告)号：US4328257A
公开(公告)日：1982-05-04
申请号：US97723
申请日：1979-11-26
CPC分类号： B05B13/0442 , B05B7/226 , C23C4/137
摘要： Uniform protective coatings are deposited on components with a high strength bond by utilizing a supersonic plasma stream and a transferred arc system of selectively reversible polarity. By maintaining plasma stream velocity at a sufficiently high Mach number, and using stream temperatures and static pressures which establish a shock pattern characteristic that diffuses the arc, the workpiece is made cathodic relative to the plasma gun at predetermined intervals. This creates a sputtering effect in which electrons and atoms are ejected from the workpiece despite the impacting plasma flow and the ambient pressure level. This sputtering action is undertaken to clean the workpiece once it is sufficiently heated and to cause intermingling of molecules of the substrate material with molecules of a deposition powder injected into the plasma flow. This preparatory deposition, together with the clean workpiece surface, enables a subsequent buildup of securely bonded and high uniform material.
摘要翻译： 通过利用超音速等离子体流和选择性可逆极性的转移电弧系统，将均匀的保护涂层沉积在具有高强度结合的部件上。 通过将等离子流速度保持在足够高的马赫数，并且使用建立起扩散电弧的冲击模式特征的流温度和静压力，使工件相对于等离子体枪以预定的间隔被制成阴极。 这产生溅射效应，其中电子和原子从工件喷射，尽管有冲击等离子体流和环境压力水平。 进行这种溅射作用以在工件被充分加热后清洁工件，并且使衬底材料的分子与注入到等离子体流中的沉积粉末的分子混合。 这种预备沉积与清洁的工件表面一起使得可以随后积聚稳固粘合和高均匀的材料。
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