Abstract
The influence of titanium diboride additives on microstructure and wear-resistance of NiCrBSi thermally sprayed coatings deposited on a steel substrate has been studied. NiCrBSi-based composite powders with 10, 20, 40 wt.% TiB 2 particles content were produced. The structure of NiCrSiB-TiB 2 coatings consists of TiB 2 and CrB grains distributed in Ni-based matrix. The wear-resistance of NiCrSiB-TiB 2 plasma sprayed coatings in dry sliding conditions against the same coating using pin-on-disk tester. It was determined that the amount of titanium diboride particles in NiCrBSi-based coatings influences essentially on the wear resistance and wear mechanism. The NiCrBSi-based plasma sprayed coatings containing 20 wt. % of TiB 2 possess the highest wear resistance due to the realization of mechano-oxidational wear mechanism. DOI: http://dx.doi.org/10.5755/j01.ms.22.1.7307
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