Microstructure and Wear Behaviour of FeNiCrBSiC-CrB2 Coating

What is it about?

In this study, the influence of plasma and detonation spraying techniques on the microstructure and wear behaviour of FeNiCrBSiC-20wt%CrB2 coating was investigated. The obtained coatings were found to comprise of Fe, Ni-based solid solution matrix reinforced with mixed boride phases (Fe,Cr)2B, (Ni,Fe,Cr)B, (Cr,Fe,Ni, Mo)B. The main microstructural differences of the plasma and detonation sprayed coatings are the morphology, the size and the distribution of hard boride particles. The tribological behaviour of coatings was examined under dry sliding conditions against Al2O3 ball at 20, 200 and 400 °C. The wear loss of detonation sprayed coatings was slightly lower at high temperatures while plasma sprayed coating had same wear at all temperatures.

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Why is it important?

The developed FeNiCrBSiC-20%CrB2 plasma and detonation coatings are attractive candidates for high temperature applications. At high temperatures (in comparison to tests at room temperature), the wear loss of the FeNiCrBSiC-20wt.%CrB2 plasma and detonation coatings was similar or slightly lower, respectively, while unreinforced commercial FeNiCrBSiC coating had 2-3 times higher wear rate.