Surface treatment in a cathodic arc plasma : Key step for interface engineering.

SCHONJAHN, Cornelia. (2001). Surface treatment in a cathodic arc plasma : Key step for interface engineering. Doctoral, Sheffield Hallam University (United Kingdom).. [Thesis]

Documents
20336:483170
[thumbnail of Version of Record]
Preview
PDF (Version of Record)
10700982.pdf - Accepted Version
Available under License All rights reserved.

Download (14MB) | Preview
Abstract
The effect of substrate surface treatment (substrate sputter cleaning) in a cathodic arc plasma prior to unbalanced magnetron deposition of transition metal nitride coatings on the performance of the coated components has been investigated. In particular the influence of parameters such as ion species, ion energy and exposure time on the changes in substrate surface topography, microstructure and micro-chemistry were studied employing transmission electron microscopy, energy dispersive X-ray analysis, electron energy loss spectroscopy, X-ray diffraction, atomic force microscopy and optical microscopy. The consequences for both the microstructure of subsequently grown transition metal nitride coatings and their adhesion were elucidated. The relevance for practical applications was demonstrated using the example of dry high-speed milling tests, which showed that an appropriate choice of substrate surface pre-treatment parameters can double the life time of the coated tools. This was found to be due to an improved adhesion as a result of a combina-tion of reduced oxygen incorporation at the interface between coating and substrate and local epitaxial growth of the coating. The latter is promoted by certain sub-strate surface pre-treatment procedures, which provide clean surfaces with preserved crystallographic order.
More Information
Statistics

Downloads

Downloads per month over past year

View more statistics

Share
Add to AnyAdd to TwitterAdd to FacebookAdd to LinkedinAdd to PinterestAdd to Email

Actions (login required)

View Item View Item