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Catalytic graphite mechanism during CVD diamond film on iron and cobalt alloys in CH4-H-2 atmospheres
Li, X. J.; He, L. L.; Li, Y. S.; Yang, Q.
2019-02-25
Source PublicationSURFACE & COATINGS TECHNOLOGY
ISSN0257-8972
Volume360Pages:20-28
AbstractIron and cobalt alloys were exposed to a CH4-H-2 mixture at about 670 degrees C during the chemical vapor deposition (CVD) of diamond film. Severe carburization is observed on pure Fe and Co-10Al alloy, resulting voluminous graphite preferentially formed before diamond deposition. To clarify the catalytic graphite mechanism, microstructures and compositions around the substrates-graphite interfacial region have been comprehensively analyzed by transmission electron microscopy (TEM). Severe internal carburization on pure Fe leads to a metastable Fe3C carbide layer formed and then decomposed, finally resulting in the precipitation of graphite. Meanwhile, graphitization also occurs on low-Al alloy (Co-10Al), the graphite is precipitated from AICo(3)C carbide as substrate carburization occurs. As a comparison, such a graphite interlayer is inhibited when the substrate carburization is effectively hindered on high-Al alloys (Fe-25Al, Co-30Al), attributed to the protection of an alumina-rich layer on the alloy surface.
KeywordGraphite Carburization CVD diamond film TEM Iron and cobalt alloys
Indexed BySCI
Language英语
WOS IDWOS:000458226700003
PublisherELSEVIER SCIENCE SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81361
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Li, X. J.,He, L. L.,Li, Y. S.,et al. Catalytic graphite mechanism during CVD diamond film on iron and cobalt alloys in CH4-H-2 atmospheres[J]. SURFACE & COATINGS TECHNOLOGY,2019,360:20-28.
APA Li, X. J.,He, L. L.,Li, Y. S.,&Yang, Q..(2019).Catalytic graphite mechanism during CVD diamond film on iron and cobalt alloys in CH4-H-2 atmospheres.SURFACE & COATINGS TECHNOLOGY,360,20-28.
MLA Li, X. J.,et al."Catalytic graphite mechanism during CVD diamond film on iron and cobalt alloys in CH4-H-2 atmospheres".SURFACE & COATINGS TECHNOLOGY 360(2019):20-28.
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