Study of the Active Screen Plasma Nitriding
来源期刊：材料热处理学报2004年第5期
论文作者：H.Dong C.X.Li Zhao Cheng T.Bell
关键词：active screen plasma nitriding (ASPN); DC plasma nitriding (DCPN); particles;
摘 要：Active screen plasma nitriding (ASPN) is a novel nitriding process, which overcomes many of the practical problems associated with the conventional DC plasma nitriding (DCPN). Experimental results showed that the metallurgical characteristics and hardening effect of 722M24 steel nitrided by ASPN at both floating potential and anodic (zero) potential were similar to those nitrided by DCPN. XRD and high-resolution SEM analysis indicated that iron nitride particles with sizes in sub-micron scale were deposited on the specimen surface in AS plasma nitriding. These indicate that the neutral iron nitride particles, which are sputtered from the active screen and transferred through plasma to specimen surface, are considered to be the dominant nitrogen carder in ASPN. The OES results show that NH could not be a critical species in plasma nitriding.
H.Dong1，C.X.Li1，Zhao Cheng2，T.Bell1
(1.Department of Metallurgy and Materials, University of Birmingham, Birmingham, UK;
2.Plasma Engineering Laboratory, Qingdao University of Science and Technology, Qingdao, China)
摘要:Active screen plasma nitriding (ASPN) is a novel nitriding process, which overcomes many of the practical problems associated with the conventional DC plasma nitriding (DCPN). Experimental results showed that the metallurgical characteristics and hardening effect of 722M24 steel nitrided by ASPN at both floating potential and anodic (zero) potential were similar to those nitrided by DCPN. XRD and high-resolution SEM analysis indicated that iron nitride particles with sizes in sub-micron scale were deposited on the specimen surface in AS plasma nitriding. These indicate that the neutral iron nitride particles, which are sputtered from the active screen and transferred through plasma to specimen surface, are considered to be the dominant nitrogen carder in ASPN. The OES results show that NH could not be a critical species in plasma nitriding.
关键词:active screen plasma nitriding (ASPN); DC plasma nitriding (DCPN); particles;
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