Interface Between Chemically Vapor Deposited Titanium Carbide and Cemented Carbide Substrate

The interface between a TiC coating deposited by CVD and a substrate of Co‐bonded multicarbide was studied by SEM, RHEED, and AES. The presence of an additional phase several micrometers thick at the interface is indicated by etching and SEM examination. Earlier supposition that it is an R) phase, W...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1979-01, Vol.62 (3-4), p.193-198
Main Authors: SHARMA, N. K., WILLIAMS, WENDELL S.
Format: Article
Language:English
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Summary:The interface between a TiC coating deposited by CVD and a substrate of Co‐bonded multicarbide was studied by SEM, RHEED, and AES. The presence of an additional phase several micrometers thick at the interface is indicated by etching and SEM examination. Earlier supposition that it is an R) phase, W6Co6C, is confirmed by reflection high‐energy electron diffraction. This phase surrounds all the near‐surface WC grains but the cubic‐carbide grains are not contacted. It is suggested that, because of their capacity for nonstoichiometry, the cubic‐carbide grains act as carbon sources and prevent the local decarburization of the binder phase which leads to η formation.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1979.tb19052.x