Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342174
Title: Surface treatment in a cathodic arc plasma : key step for interface engineering
Author: Schonjahn, Cornelia
ISNI:       0000 0001 3556 6854
Awarding Body: Sheffield Hallam University
Current Institution: Sheffield Hallam University
Date of Award: 2001
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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.
Supervisor: Munz, W. D. ; Lewis, D. B. ; Rodenberg, J. M. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.342174  DOI: Not available
Keywords: SUBSTRATES; SURFACE CLEANING; SURFACES; SURFACE COATING; MICROSTRUCTURE; X-RAY DIFFRACTION; ATOMIC FORCE MICROSCOPY; OPTICAL MICROSCOPY; TRANSMISSION ELECTRON MICROSCOPY; STRUCTURAL CHEMICAL ANALYSIS; PLASMA ARC SPRAYING
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