Wear Resistance of Plasma Coatings Based on Self-Fluxing PG-10K-01 Alloy Strengthened by Transition Metal Borides
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Resistance of Plasma Coatings Based on Self-Fluxing PG-10K-01 Alloy Strengthened by Transition Metal Borides N. A. Rudenskaya* Institute of Improvement of Professional Skills and Staff Retraining, Belarus National Technical University, Minsk, 220107 Belarus *e-mail: [email protected] Received February 5, 2020; revised July 6, 2020; accepted July 7, 2020
Abstract—The presented results significantly expand the information on the modification of sputtered materials (PG-10K-01 + CrB2 or TiB2) in a plasma stream, which makes it possible to vary the operational parameters of the process for shaping the necessary structure of the protective layer with enhanced performance properties. Thus, if the parts are subject to impact loads, the preferred option is fused coatings in the form of gradient-layer composites. If the parts operate under ordinary abrasive friction, the fusion operation can be excluded from the production process provided that particles are ground during sputtering; in addition, an evenly strengthened coating structure is formed. New compositions of microcomposites for plasma sputtering of coatings are developed for being crushed in the plasma stream, which is followed by the spheroidization of dispersed components; this allows excluding the use of submicron powders during plasma sputtering for they are somewhat difficult to supply along powder-feeding lines and improving the wear resistance of the composites by 7.35–27.33%. Keywords: wear resistance, plasma coatings, powder, titanium and chromium diborides, stellite, heat-proof impurities, structure, spheroidites, pulsed division, properties DOI: 10.3103/S1068366620050153
INTRODUCTION Plasma coatings based on self-fluxing alloys are sophisticated composite systems with enhanced performance properties, such as wear resistance, impact resistance, and corrosion resistance [1], and have become widely used in strengthening and recovering component parts in various industries; however, these coatings are still understudied. When sputtered, the coatings of this class of materials are usually processed by fusion. The strengthened dispersed structure that is formed in the fusion phase ensures the above enumerated properties; the quality is significantly improved due to reduced porosity and the coatings acquire adhesion strength at the built-up material level. In addition, to use these coatings for strengthening component parts of machines operating in extreme conditions, they are alloyed with high-melting compounds represented by borides, carbides, titanium, chromium, zirconium, aluminum, and titanium carbonitride. Fused coatings are structurally characterized as multilayer, evenly strengthened, and gradient-layered [2]. The exposition of the results of studying the pulsed division of plasma spheroidites (PDPSs) [3, 4], observed during plasma spheroidization of particles of certain powders of ceramic materials and various
alloys, self-fluxing alloys included (PN73KH16S3R3, PG-10K-01), was logically followed by the question about the influence of that process on
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