Exploitable results Increase of reliability and durability of space mechanisms intended for repeated usage under extreme conditions The problem of the long-term operation of modern space objects (communication space satellites, orbital space stations, shuttle type spacecraft, space probe, etc.) requires a number of complicated tasks concerning reliability and durability of a great variety of mechanisms working under extreme conditions of outer space. Decrease of wear and increase of friction joints life-time were the main applied aims of the Project. The following main results have been reached as a result of the Project execution : tribotechnical requirements for various space mechanical components (clamps, slip rings, telescopic joints, etc.) have been defined based on analysis of wear process and exploitation conditions; actual temperature values in contact area were defined by means of modern pyrometric technique. Obtained information were used for calibration of wear process model based on description of cracking process; thermal processes at the contact area were evaluated by using a thermophysical model of the heating of a two-layer system by a spatially uniform heat flow from friction area. It allowed to get the temperature distribution in surface layer (taking into account the thermal resistance between coating and substrate) and, based on this data, to describe the cracking process both on the friction surface and inside of wear resistant coating using thermophluctuation theory of destruction; relevant physical and mathematical models of materials wear under vacuum conditions in wide temperature range were created; tribotechnical pairs with minimum heat generation at the contact area and minimum distance of sliding or rolling friction (optimum initial outlines and optimum rolling tracks shapes) were designed: cylindrical gear with an involute profile and Novikov gears with the DLZ-1 .0-0. 15 profile; experimental investigations of the influence of the environment and main loading parameters on wear and lifetime of optimised gears and supports were carried out: cylindrical gears (120 pairs) and Novikov gears with the DLZ- 1 .0-0. 15 profile (60 pairs). new types of wear resistance coatings and methods of their synthesis were developed for mechanical units with complex geometrical shape of working surface: innovative method of synthesis of thermodiffusion MoS2 based coating with post laser soft heat treatment (MD1); innovative method of point-to-point laser alloying (creation of the alloyed points network) of steel substrate with In, Ga, Sn (MD2); applied programs for the statistical design of experiments and for the prediction of the wear life of the optimised gears (Novikov gears) were developed; quantitative estimation of the plausibility of wear models and the developed methods of wear resistance improvement for actual mechanisms under actual flight conditions were tested for wear life estimation of low-speed step (Novikov gear) of solar array drive (SAD). Searching for OpenAIRE data... There was an error trying to search data from OpenAIRE No results available
