Aldrich-Smith, G; Jennett, N M; Housden, J* (2004) A round robin to measure the adhesion of thin coatings. NPL Report. DEPC-MPE 001

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Abstract

An interlaboratory exercise on 5µm thick chromium nitride (CrN) coated AISI 304 austenitic stainless steel coupons was undertaken to evaluate and compare test methods for adhesion of thin coatings. Test coupons were deposited with and without thin (25nm & 50nm) gold-palladium interlayers. These interlayers were designed to vary the effective adhesion of the CrN in a controlled way without significantly altering the CrN coating fracture properties. The interlaboratory exercise was conducted by an international group of laboratories examining Rockwell indentation, scratch testing, uniaxial tensile and four-point bend. None of the tests were able to discriminate between coupons with or without the interlayer. The new EU Community Bureau of Reference scratch test reference material (BCR-692), distributed to participants to assist in the calibration of scratch test instruments used in this study, was shown to be able to diagnose instrument problems.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	DEPC-MPE 001
Keywords:	scratch test, rockwell indentation
Subjects:	Advanced Materials Advanced Materials > Adhesives
Last Modified:	02 Feb 2018 13:16
URI:	http://eprintspublications.npl.co.uk/id/eprint/3055

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