ANALYSIS OF FRACTURE AND DURABILITY OF COMPOSITE COATINGS BASED ON THE ENERGY MODEL
Journal Title: Проблеми тертя та зношування - Year 2018, Vol 81, Issue
Abstract
The paper presents the research results of friction fracture processes with an example of com-posite electrolytic coatings. With the methods of analysis of theoretical and experimental re-sults of the study using the energy model of the wear particles formation in near-surface zones of friction pairs is made by evaluating the process of the layers surface destruction. The pres-ence of the dependence of the wear particles size on the material mechanical properties has been established. The results analysis of coatings durability is executed. It is established that the condition of the coating destruction in the process of friction is determined by its mechani-cal properties and is achieved faster for wear particles with larger sizes. The size of the wear particles is smaller in the case of a material with higher hardness (with a large value of Young's modulus of elasticity), but larger - in a material with greater strength (large values of specific energy of cohesion).The minimum resistance wear corresponds to the optimal content and the size of the filler, when the grain size of the filler corresponds to the size of the wear particles. If the size of the filler grains becomes larger than the average particle size of the wear character-istic of this saturation level, the particles of wear will be the filler grain (TiB2). The nature of wear becomes more abrasive and wear is growing. It is theoretically grounded and experimen-tally proved that for an equal specific cohesivity of SiC (12.68 eV) and TiB2 (13.51 eV), it is advisable to choose a filler with higher hardness SiC (392 GPa), TiB2 (530 GPa), respectively the ratio of Young's modulus of elasticity and specific energy of cohesion forSiC = 31.25, for TiB2 = 39.23.
Authors and Affiliations
M. V. KINDRACHUK, V. V. KHARCHENKO, Yu. O. TSUBRII, I. V. KOSTECTSKII, M. A. GLOVIN
Keywords
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