The adhesion of hot-filament CVD
diamond films on AISI type 316 austenitic stainless steel
Buijnsters JG,
Shankar P, van Enckevort WJP, Schermer JJ, ter Meulen JJ
DIAMOND AND
RELATED MATERIALS 13 (4-8): 848-857 APR-AUG 2004
Abstract:
Steel ball indentation and scratch adhesion testing of hot filament
chemical vapour deposited diamond films onto AISI type 316 austenitic
stainless steel substrates using two different interlayer systems,
namely chromium nitride and borided steel, have been investigated. In
order to compare the adhesion of these films with that of a well-known
and strongly adherent system, detailed adhesion tests were performed on
diamond films grown on molybdenum substrates as well. Scanning electron
microscopy analysis of various indented regions on the diamond-coated
steel and molybdenum samples in combination with the measurement of the
acoustic emission signals during loading, indicate that the adhesion of
the coatings on the stainless steel substrates with the CrN interlayer
is comparable and only slightly less than that of the strongly adhering
diamond films on the molybdenum samples. The critical load value
derived from the acoustic emission signals at which partial delammation
of the diamond films is first observed, is significantly lower for the
diamond-coated steel with the boride interlayer than that obtained with
the CrN interlayer for the present deposition conditions used. The
steel ball indentation tests also show that the hardness and thickness
of the interlayer have a strong effect on the penetration depths of the
indents. Scratch tests performed on the diamond coated stainless steel
specimens with the boride interlayer show no significant coating
failure for loads up to 80 N.