Computer controlled detonation spraying of WC/Co coatings containing MoS2 solid lubricant
A. Shtertser, C. Muders, S. Veselov, S. Zlobin,V. Ulianitsky,X. Jiang,V. Bataev
Surface & Coatings Technology
Abstract
Composite WC/Co + MoS2 coatings were deposited onto steel substrates by Computer Controlled Detonation.Spraying using three spraying modes: very cold, cold and normal. Maximal content of MoS2 in a sprayed powder was 10 wt.%. Characterization of coatings was made with chemical and phase analyses, microhard-ness measurement, morphology and microstructure investigation . X-ray diffraction study shows that residual MoS2 exists only in coatings obtained at very cold and cold spraying modes. At normal spraying mode com-plete decomposition of the solid lubricant occurs during spraying. From the engineering point of view, the coating applied at the cold mode using a powder containing 10 wt.% MoS2 is the most promis ing. Such a coat-ing has microhardness of 650 HV0.2 and a porosity of 10 %.
keywords:Detonation spraying; Spraying mode; Hard alloy WC/Co; Solid lubricant MoS2; Chemical composition; Chemical composition
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