The work purpose consists in the investigation of carbometal coatings wear-resistance and micro-hardness depending on chemical structure of their components. The investigation object is carbide-metal coatings. The result analysis of comparative wear-resistance tests witnesses that with micro-hardness increase in metal carbides of compositions: Cr3C2, WC, TiC, TiCN, at a constant content of cladding metal (30…35mass %), a value of wear decreases according to the linear law. Wear intensity of coatings of clad carbide mixtures with different materials is defined to a certain extent with wear intensity of material added to the matrix. In the course of the work there were developed coating compositions reinforced with quasi-crystals, there is defined an optimum composition and modes of coating application with the gas-detonation method and their wear-resistance and micro-hardness were investigated.
The work purpose consists in the development of the procedure for density and strength definition through the method of hydro-static weighing in relation to titanium carbonitride-based coatings. The development object – quasi-crystals based titanium carbonitride clad with nickel. Novelty and urgency of this work are based on the creation of polymeric antifriction materials intended for operation in the mode of hydro-dynamic friction. Frictionless and slider bearings with anti-friction coatings are the most efficient structures allowing the considerable increase of capacity and reliability of friction unit operation in machinery. There are presented microstructure photos of coatings obtained with the method of gas-dynamic sputtering. As a result of the technology developed it is defined that at the base a coating has the VN20 coarse-grain which has maximum parameters of static strength (bending, tearing and adhesion strength) at the expense of its structure and coarse grain. As we move forward from the layer adjoining the base to the operation one of the coating we observe the decrease of structure grain (from 100 to 15 mkm) and a gradual change of the composition, micro-hardness increase. As a result a carrying layer of KNTP35 coating has maximum parameters of long strength at the expense of a fine-grain structure and composition. It is characterized with increased resistance to thermal blow, tacking, spalling and higher impact elasticity and wear-resistance. In the paper there is offered a method of hydro-static weighing for the determination of density and porosity regarding coatings. According to the optimum technological mode are made samples and their porosity and density are investigated.
The work purpose is to investigate strength properties of composite coatings with quasi-crystals obtained through the method of gas dynamic sputtering. The object of development: quasi-crystals based on titanium carbonitride clad with nickel. In the course of the work there is offered a method for investigations of coating strength based on a pin and adhesive method with composites based on titanium carbonitride. The novelty of this investigation consists in obtaining new materials and investigations of their physical-mechanical properties. Composite coating on the basis of titanium carbonitride has shown high separation properties. The destruction took place in an intermediate layer between VN20 and KNTP35. During 10 mm bending there is a fine even mesh. At the impact load made there were not observed chips and separations that allow using coating data in heavy-loaded parts.
ОЦЕНКА ПРОДОЛЖИТЕЛЬНОСТИ ПРИРАБОТКИ ПАР ТРЕНИЯ С ТВЕРДОСМАЗОЧНЫМИ ПОКРЫТИЯМИ В РАЗЛИЧНЫХ УСЛОВИЯХ ЭКСПЛУАТАЦИИВ результате проведения планируемых экспериментов получены модели 2-го порядка для оценки продолжительности приработки пар трения с твердосмазочными покрытиями (ТСП) ВНИИ НП 212 для условий нормальной атмосферы и вакуума. Рассчитаны корреляционные зависимости продолжительности приработки от общей наработки рас-сматриваемых пар трения. Выявлено определяющее влияние скоростного фактора на продолжительность приработки в рассмотренных условиях.Ключевые слова: пара трения, приработка, твердосмазочные покрытия, нормальная атмосфера, вакуум. P.N. Khopin ESTIMATE OF FRICTION PAIR RUNNING-IN DURATION WITH SOLID LUBRICANT COATING UNDER DIFFERENT OPERATING CONDITIONSAs a result of planned experimental investigations there are calculated polynomial models of the 2-d order for the estimate of the duration of friction pair running-in with solid lubricant coatings (SLC) VNII NP 212 for the conditions of vacuum and normal environment. The correlation dependence between a running-in duration and a general operating time of the friction mating under consideration is defined. The most substantial factor of a slip velocity influencing most upon running-in duration both under conditions of common environment, and in vacuum is revealed. It is defined that running-in duration exceeds in vacuum 7-11 times similar tribotechnical index for conditions of common environment.
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