Skip to main content

Research Repository

Advanced Search

Some considerations in using the small punch testing for thermally sprayed CoNiCrAlY coatings

Chen, H.; Rushworth, A.; Sun, W.; He, J.; Guo, H.

Authors

H. Chen

A. Rushworth

W. Sun

J. He

H. Guo



Abstract

Small punch testing exhibits great potential in mechanical characterisation of thin coatings. This testing method can be used to determine the mechanical performance of thermally sprayed coatings, especially to qualitatively characterise the effects of coating defects on the mechanical behaviour. In this work, some considerations in using the small punch testing for coatings are presented through a microstructure evolution analysis of a vacuum plasma sprayed CoNiCrAlY coating under small punch test. The CoNiCrAlY coating was characterised with a large number of un-melted particles as the coating defects. It is shown that the clamping in the small punch test rig can result in micro-cracking around the un-melted particles in the coating prior to testing. It is also found that the un-melted particles in the coating act as predominant cracking sites and fast failure occurred around the un-melted particles. Careful considerations need to be taken into account when using the small punch test for coatings to avoid any changes in the coating microstructure and plasticity during the clamping stage.

Journal Article Type Article
Publication Date Jan 15, 2019
Journal Surface and Coatings Technology
Print ISSN 0257-8972
Electronic ISSN 1879-3347
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 357
Pages 684-690
APA6 Citation Chen, H., Rushworth, A., Sun, W., He, J., & Guo, H. (2019). Some considerations in using the small punch testing for thermally sprayed CoNiCrAlY coatings. Surface and Coatings Technology, 357, 684-690. doi:10.1016/j.surfcoat.2018.10.080
DOI https://doi.org/10.1016/j.surfcoat.2018.10.080
Keywords Small punch test; Mechanical behaviour; CoNiCrAlY coatings; Un-melted particles; Cracking
Publisher URL https://www.sciencedirect.com/science/article/pii/S0257897218311873?via%3Dihub
Additional Information This article is maintained by: Elsevier; Article Title: Some considerations in using the small punch testing for thermally sprayed CoNiCrAlY coatings; Journal Title: Surface and Coatings Technology; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.surfcoat.2018.10.080; Content Type: article; Copyright: © 2018 Elsevier B.V. All rights reserved.

Files

Some considerations in using the small punch testing for thermally sprayed CoNiCrAlY coatings (1.9 Mb)
PDF





You might also like



Downloadable Citations

;