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1 2015

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Fracture and yield behaviour of wear and erosion resistant boron phosphide coatings for aerospace and automotive applications

Ogwu A. A., Hellwig T., Haddow D.

Archives of Materials Science and Engineering

2015

Vol. 75, nr 1

30--34

Purpose: The investigation of mechanical properties of boron phosphide thin film coatings prepared by PECVD. Design/methodology/approach: The hardness of the films was determined by nanoindentation. The fracture toughness was measured by Vickers indentation and the yield strength of the films on ZnS and <100> silicon substrate was measured by a simplified form of the spherical cavity model. Findings: The measured mechanical properties indicate that boron phosphide coatings have potential engineering applications beyond protecting infrared substrates from sand erosion in aerospace environments. Research limitations/implications: Their mechanical properties are comparable to those of DLC and Si-DLC films, in addition to their superior corrosion and sand abrasion resistance. Practical implications: Originality/value: Experimental data on the mechanical properties of boron phosphide coatings that indicate their surface protection promise in engineering applications.