It is shown that mechanical characteristics of the coatings depend on their technological conditions of their deposition. We propose a procedure of optimization of the technological process and control over this process according to the criteria of strength and specific consumption of materials by analyzing an example of plasma spraying of erosion-resistant coatings. The erosion resistance exhibits the most stable correlation with the cohesive strength of the coatings. The regression equations are used to determine the maximum levels of cohesive strength of the coatings and erosion resistance for the optimal combinations of technological parameters of.Introduction. The development of all technological processes (TP) is inevitably connected with the solution of the problems of optimization. In the field of development of hardening protective coatings (HPC), the problems of optimization play a key role. This is explained by the fact that numerous methods of deposition of the coatings in combination with a broad range of materials used to form the coatings and a great number of affecting factors offer numerous alternatives to the industrial engineers. In this case, the efficiency of decision-making depends on the existence of strength criteria used to control the technological processes.State-of-the-Art of the Problem. In view of the high sensitivity of the mechanical characteristics of coatings and matrices to the conditions of their deposition, special requirements are imposed on the optimization and realization of technological processes according to the strength criteria. There exist contradictory data concerning the influence of technological conditions on the operating characteristics of the HPC [1]. This is why attempts were made to systematize technological parameters both in the form of charts of the sources of influence on the properties of the coatings [2] and in the form of hierarchical schemes of parameters [3]. There are numerous works devoted to the determination of the optimal parameters and relationships between the technological conditions and properties of the coatings [4-8], including the works dealing with the stability of gas-thermal coatings under the conditions of gas-abrasive wear [9].In connection with the application of computers in systems of automated design of the technological processes and systems of automated control over these processes, we observe the appearance of a certain mismatch between the possibilities of computers and their application. Thus, the development of new mathematical models and software turns into an urgent problem. Modeling is based on the methods of the theory of the experiment planning and is performed by using computers. However, the developed mathematical models of the systems of automated design of technological processes and control over these processes do not cover a large number of the phenomena
In this work, a multicriteria optimization of the technology for applying discrete coatings by electrospark alloying in the restoration of bronze parts is carried out. As criteria for optimizing the process of electrospark alloying, tribotechnical characteristics were chosen – the wear intensity and friction coefficient of the coating. As adjustable parameters, those design, technological and operational factors that have the greatest influence on the value of optimization criteria are used: coating material; lubricant; operating current; amplitude of electrode oscillations; sliding speed; specific load. As a result of experimental studies, experimental dependences of wear intensity and friction coefficient for various coating materials, sliding speeds and lubrication conditions were obtained. The use of multicriteria optimization of the electrospark alloying technology made it possible to obtain various alternative coating options and technological parameters of their application for various operating conditions. Of the studied coatings, the most effective is a two-layer coating with the first layer SP-2 and an outer layer of the base material bronze BrAZhMts 10-3-1.5, which is explained by the formation of wear-resistant areas based on Mn and Ni. Multiparametric optimization of the electrospark alloying technology made it possible to reveal a combination of structural and technological factors that ensure the formation of discrete coatings with high operational properties in the restoration of bronze parts.
In this work, the technology of 30HGSA steel ion nitriding was optimized in terms of tribotechnical characteristics – wear intensity and friction coefficient. When choosing controlled factors, the influence of all existing groups of factors that can affect the process of ion nitriding is taken into account: structural, technological and operational. Friction and wear tests were carried out under conditions that are as close as possible to the actual operating conditions of aircraft parts made of 30HGSA steel. As a result of experiments on friction and wear, tribotechnical characteristics of coatings were obtained depending on structural, technological and operational factors, respectively, to the matrix. The conducted studies showed the presence of three clearly defined zones in the dependences of wear intensity and friction coefficient on specific load at different sliding speeds and technological parameters of ion nitriding: run-in zones, uniform and catastrophic wear. The nature of samples dependences hardened by ion nitriding and heat-treated samples is similar and coincides with modern views on the laws of friction and wear processes. Analysis of tribotechnical characteristics showed the effectiveness of ion nitriding technology in comparison with traditional heat treatment. The optimal processing modes for the studied steel and triboconjugation have been established
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