| Study of the Active Screen Plasma Nitriding |
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| 作者姓名： | ZhaoCheng C.X.Li H.Dong T.Bell |
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| 作者单位： | [1]PlasmaEngineeringLaboratory,QingdaoUniversityofScienceandTechnology,Qingdao,China [2]DepartmentofMetaUurgyandMaterials,UniversityofBirmingham,Birmingham,UK |
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| 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.
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| 关 键 词： | 等离子渗氮 ASPN DCPN SEM |
Study of the Active Screen Plasma Nitriding |
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| ZhaoCheng C.X.Li H.Dong T.Bell.Study of the Active Screen Plasma Nitriding[J].Transactions of Materials and Heat Treatment,2004,25(5):330-333. |
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| Authors: | Zhao Cheng CXLi HDong TBell |
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| Affiliation: | 1. Plasma Engineering Laboratory, Qingdao University of Science and Technology, Qingdao, China
2. Department of Metallurgy and Materials, University of Birmingham, Birmingham, UK |
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| Abstract: | 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 carrier in ASPN. The OES results show that NH could not be a critical species in plasma nitriding. |
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| Keywords: | active screen plasma nitriding (ASPN) DC plasma nitriding (DCPN) particles |
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