MULTIDIMENSIONAL OPTIMIZATION OF HARD ALLOYTHERMOHYDROCHEMICAL TREATMENT IN ZINCAND MOLYBDENUM OXIDES HYDROSOL
Keywords:
thermohydrochemical treatment; hard alloy; solid lubricating coating; tools.Abstract
The results of a study of the tribotechnical properties of solid lubricant coatings obtained on the hard alloy VK6 (94 % WC + 6 % Co) as a result of thermohydrochemical treatment are presented. The studied process involves:
hydrochemical treatment of the alloy in a water-dispersive ZnO + MoO3 medium; heat treatment. A multidimensional technological optimization of the medium composition and the thermohydrochemical treatment temperature-time parameters was carried out according to the friction coefficient of the obtained solid lubricating coatings. Using mathematical models, diagrams “process parameters — property” are constructed. Processing according to the optimal
mode allows, in the absence of lubrication, to reduce the coefficient of the hard-alloy surface friction by 3.5 times compared with the untreated one. The developed technology permits increasing the durability of carbide tools by the
factor of 1.3…4,0 in comparison with non-hardened ones.
Fig. 4. Table 4. Ref.: 23 titles
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