The Effect of Detonation Spraying Mode on the Structure and Tribological Properties of WC–Co Coatings

Abstract

The article presents the results of research into the structure and tribological testing of WC-Co detonation coatings with a barrel filling volume of 64 % and 74 %. X-ray diffraction analysis of the WC-Co coating re vealed that undesirable Co and W2C peaks disappear after detonation spraying. Morphological analysis showed that with 64 % and 74 % detonation barrel filling, the coatings had a dense structure with a thickness of 136 μm and 161 μm, respectively. EDS mapping showed a uniform distribution of elements. Tribological tests of the coating revealed that the friction coefficient of the samples ranged from 0.48 to 0.53 for 74 % and 0.55–0.57 for 64 %. Based on the results obtained, the optimal technological regime for obtaining wear resistant WC-Co coatings by detonation spraying was established.