Characterization of vacuum plasma spray VPS - W coating deposited on stainless steel substrates

In this paper, studied was the melting of W powder particles in plasma, their behavior at oxidation as well mechanism hardening on surface substrate. Tungsten coating layers were deposited with vacuum plasma spray technology (VPS) test specimens steel Č.4171 (X15Cr13 EN10027). VPS has advantages over APS due to decreased melted particles, by producing a controlled proportion micro pores and greater uniformity layers. Evaluation mechanical characteristics done examining microhardness using HV0.3 method tensile bond strength testing. The microstructures analyzed means optical microscopy (OM) scanning electron (SEM). results obtained showed that tungsten consisted interconnected overlapping, which shows typical lamellar microstructure. Present microstructure are very small inter-lamellar boundaries. Tests have shown inert gas shielding low pressure good properties microstructure, fully enables its use exploitation.