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Tuesday, 17 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Protective coatings: Analysing particle erosion data for aerospace applications

Thursday, 23 October 2014

Canadian researchers have developed a methodology for the accurate interpretation of solid particle erosion data.

An overview of the material loss mechanisms during solid particle erosion (SPE) will be presented. Source: AkzoNobel

An overview of the material loss mechanisms during solid particle erosion (SPE) will be presented. Source: AkzoNobel

The design of the appropriate material system for a given tribological application must be guided by an accurate understanding of the degradation mechanisms and the surface response to loading and deformation. In this article, a detailed overview of the material loss mechanisms during solid particle erosion (SPE) which occurs when hard particles are entrained by an air flow and impact exposed surfaces will be presented.

Need for highly resolved characterisation tools

In the first part of the paper, several methodological considerations essential for the assessment of multi-parameter correlations necessary for the accurate interpretation of SPE data will be discussed. Then, the ductile and brittle SPE mechanisms, the transitions between these different material removal processes and the effect of particle properties on overall erosion behavior will be examined. Finally, in the last section of the paper, the various coating material systems proposed in the literature for protection against SPE are reviewed with a focus on the two main categories of TiN-based and carbon-based coatings. Concluding this review is a discussion on the effects of coating system microstructure and architecture on the SPE mechanisms of vapor deposited coatings. It will be shown that to significantly impact the future technological development of SPE protective coatings, novel highly resolved characterisation methodologies need to be developed and employed.

The study is published in: Surface and Coatings Technology, Volume 257, 25 October 2014, Pages 165–181.

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