High velocity sand impact damage on CVD diamond
High velocity sand impact damage on CVD diamond
This paper describes a recent study of the damage mechanisms generated by high velocity-sand impact on diamond coatings deposited on tungsten substrates by chemical vapour deposition (CVD). The coatings were erosion tested using 90–355-?m diameter sand at a velocity of 268 m s?1 and the eroded coatings examined by scanning electron and acoustic microscopy. The images indicate that the circumferential cracks and pinholes are the main erosion features and are only located on debonded areas of the coating. This suggests that they could be formed by stress waves reflected from the coating–substrate interface, which interact with surface waves to generate circumferential cracks, the precursor to pinholes. The high spatial resolution of scanning acoustic microscopy enables the resolution of individual pinholes, thus, providing important evidence for identifying the mechanism responsible for the formation of circumferential cracks, the precursor to the pinholes. However, the acoustic images must be interpreted with care; in particular, it is important to compare microstructural features observed by acoustic microscopy with other techniques.
coating, defect, diamond films, tribology
459-462
Wheeler, D.W.
d276c145-56e0-48d0-ae37-a84dda92a947
Wood, R.J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73
2001
Wheeler, D.W.
d276c145-56e0-48d0-ae37-a84dda92a947
Wood, R.J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73
Wheeler, D.W. and Wood, R.J.K.
(2001)
High velocity sand impact damage on CVD diamond.
Diamond and Related Materials, 10 (3-7), .
(doi:10.1016/S0925-9635(00)00520-3).
Abstract
This paper describes a recent study of the damage mechanisms generated by high velocity-sand impact on diamond coatings deposited on tungsten substrates by chemical vapour deposition (CVD). The coatings were erosion tested using 90–355-?m diameter sand at a velocity of 268 m s?1 and the eroded coatings examined by scanning electron and acoustic microscopy. The images indicate that the circumferential cracks and pinholes are the main erosion features and are only located on debonded areas of the coating. This suggests that they could be formed by stress waves reflected from the coating–substrate interface, which interact with surface waves to generate circumferential cracks, the precursor to pinholes. The high spatial resolution of scanning acoustic microscopy enables the resolution of individual pinholes, thus, providing important evidence for identifying the mechanism responsible for the formation of circumferential cracks, the precursor to the pinholes. However, the acoustic images must be interpreted with care; in particular, it is important to compare microstructural features observed by acoustic microscopy with other techniques.
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Published date: 2001
Keywords:
coating, defect, diamond films, tribology
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Local EPrints ID: 21770
URI: http://eprints.soton.ac.uk/id/eprint/21770
ISSN: 0925-9635
PURE UUID: adb2dc67-86b5-4960-a4c3-e3feee5cbd29
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Date deposited: 15 Mar 2006
Last modified: 16 Mar 2024 02:46
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Author:
D.W. Wheeler
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