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新型超音速火焰喷涂系统(HVAF)主要用于生产硬质合金和金属合金涂层。该过程类似于传统的超音速氧焰喷涂(HVOF)工艺,但采用空气代替氧气为助燃剂。因此,超音速火焰喷涂工艺的火焰温度更低(~2300K),从而最大限度地减低了喷涂材料的氧化和热失效。该工艺粒子飞行速度可达1000米/秒。本文对HVAF WC-CoCr涂层进行了研究,采用截面法对涂层显微组织形貌等特性进行了观测和讨论,对涂层的表面质量和相成分进行了分析。此外,还测量了涂层的硬度,通过电化学腐蚀试验表征了涂层的腐蚀行为。最后,将该涂层的检测结果与电镀硬铬涂层进行了比较和分析。
The new supersonic flame spraying system (HVAF) is mainly used for the production of hard metal and metal alloy coating. This process is similar to the conventional HVOF process but uses air instead of oxygen as the oxidizer. As a result, the flame temperature of the supersonic flame spray process is lower (~ 2300K), minimizing oxidation and thermal failure of the spray coating material. The craft particles flying speed up to 1000 m / s. In this paper, the HVAF WC-CoCr coating was studied. The cross-section method was used to observe and discuss the microstructure and other characteristics of the coating. The surface quality and phase composition of the coating were analyzed. In addition, the hardness of the coating was also measured and the corrosion behavior of the coating was characterized by electrochemical corrosion test. Finally, the test results of the coating were compared with the hard chrome coating.