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Optimum tests conditions for attaining uniform rolling abrasion in ball cratering tests on hard coatings

Optimum tests conditions for attaining uniform rolling abrasion in ball cratering tests on hard coatings
Optimum tests conditions for attaining uniform rolling abrasion in ball cratering tests on hard coatings
This paper covers research into the abrasion response of two hard coatings, CVD diamond and CVD boron carbide (B13C2 phase), studied under a range of micro-abrasion test conditions to evaluate those which result in uniform and symmetric (i.e. non-ridged or ribboned) wear scars generated by uniform three-body rolling abrasion. Rotating steel balls on CVD boron carbide and tungsten carbide balls on CVD diamond were loaded in the presence of 4.5–6.0 ?m SiC abrasive slurry with varying solid concentrations of 0.35–0.7 g/ml (vol. fraction: 0.112–0.24). The applied normal loads were between 0.25 and 2.0 N with sliding speeds between 30 and 150 rpm (0.04–0.2 m/s). The optimum conditions to obtain uniform three-body rolling abrasion for both coatings was established to be at 0.3 N normal load, 75 rpm (0.1 m/s) ball rotation speed and at a SiC slurry concentration of 0.5 g/ml. Under the optimum test condition, abrasion in both CVD coatings occurs predominantly through brittle micro-chipping of the CVD grains resulting in near perfect hemispherical wear scars. Significant grooving and scratch marks are observed at higher loads and ball rotation speeds which suggests a transition to sliding abrasion under these conditions caused by the abrasive and/or wear debris becoming embedded in the ball. This results in an uneven wear pattern across the scar. Sites of complete coating removal from the substrate are also observed coinciding with higher abrasion rates. Profilometry revealed a 5–10% error in the evaluating the wear scar volume from optical measurements. The results show that the steady state specific wear rate of CVD diamond coatings (2–3 × 10?14 m3 N?1 m?1) is more than an order of magnitude lower than that of CVD boron carbide (6–7 × 10?13 m3 N?1 m?1).
micro-abrasion, cvd coatings, grooving abrasion, rolling abrasion, boron carbide, diamond
0043-1648
322-332
Bose, K.
0c7c0fc4-9386-4cef-a70d-e3c810db005c
Wood, R.J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73
Bose, K.
0c7c0fc4-9386-4cef-a70d-e3c810db005c
Wood, R.J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73

Bose, K. and Wood, R.J.K. (2005) Optimum tests conditions for attaining uniform rolling abrasion in ball cratering tests on hard coatings. Wear, 258 (1-4), 322-332. (doi:10.1016/j.wear.2004.09.018).

Record type: Article

Abstract

This paper covers research into the abrasion response of two hard coatings, CVD diamond and CVD boron carbide (B13C2 phase), studied under a range of micro-abrasion test conditions to evaluate those which result in uniform and symmetric (i.e. non-ridged or ribboned) wear scars generated by uniform three-body rolling abrasion. Rotating steel balls on CVD boron carbide and tungsten carbide balls on CVD diamond were loaded in the presence of 4.5–6.0 ?m SiC abrasive slurry with varying solid concentrations of 0.35–0.7 g/ml (vol. fraction: 0.112–0.24). The applied normal loads were between 0.25 and 2.0 N with sliding speeds between 30 and 150 rpm (0.04–0.2 m/s). The optimum conditions to obtain uniform three-body rolling abrasion for both coatings was established to be at 0.3 N normal load, 75 rpm (0.1 m/s) ball rotation speed and at a SiC slurry concentration of 0.5 g/ml. Under the optimum test condition, abrasion in both CVD coatings occurs predominantly through brittle micro-chipping of the CVD grains resulting in near perfect hemispherical wear scars. Significant grooving and scratch marks are observed at higher loads and ball rotation speeds which suggests a transition to sliding abrasion under these conditions caused by the abrasive and/or wear debris becoming embedded in the ball. This results in an uneven wear pattern across the scar. Sites of complete coating removal from the substrate are also observed coinciding with higher abrasion rates. Profilometry revealed a 5–10% error in the evaluating the wear scar volume from optical measurements. The results show that the steady state specific wear rate of CVD diamond coatings (2–3 × 10?14 m3 N?1 m?1) is more than an order of magnitude lower than that of CVD boron carbide (6–7 × 10?13 m3 N?1 m?1).

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More information

Published date: 2005
Additional Information: Second International Conference on Erosive and Abrasive Wear
Keywords: micro-abrasion, cvd coatings, grooving abrasion, rolling abrasion, boron carbide, diamond

Identifiers

Local EPrints ID: 22983
URI: http://eprints.soton.ac.uk/id/eprint/22983
ISSN: 0043-1648
PURE UUID: 67d8d533-6bc4-43d9-853d-29f024c2a5c4
ORCID for R.J.K. Wood: ORCID iD orcid.org/0000-0003-0681-9239

Catalogue record

Date deposited: 14 Mar 2006
Last modified: 03 Dec 2019 02:02

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Contributors

Author: K. Bose
Author: R.J.K. Wood ORCID iD

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