The article considers the issues of production of powder antifriction materials based on iron by methods of pressing and rolling powder mixtures. The analysis of influence of composition of materials, technological conditions of their production and other factors on the structure, mechanical and tribotechnical properties of powder sliding bearings was carried out. During the operation of the machine, its elements, subjected to various influences, change in state, size and properties. The effectiveness of developments in the field of tribotechnical materials is determined by the properties of these materials, as well as the speed and breadth of their industrial use. The effect of porosity of samples on their tribotechnical properties and hardness after sintering and additional heat treatment is studied. The results of tribotechnical tests of iron-copper-graphite sintered sulfided compositions, not alloyed and doped with phosphorus, as well as materials including additional lubricant components: graphite, molybdenum disulfide or calcium fluoride, are presented. On the basis of tests, it was found that in conditions of liquid friction, alloying with phosphorus has a decisive effect on increasing wear resistance, and without supplying lubricant to sintered samples with impregnated oil, wear is more than an order of magnitude higher compared to the conditions of liquid friction.
In engineering, the phenomenon of heat transfer through cylindrical walls and various shells formed by the rotation of flat figures around a fixed axis is often used. Such structural elements are widely used in condensers of steam turbine installations, in the details of the flow part of gas turbines, rocket and aircraft engines. The article describes the solution of the problem of rational choice of thermal insulation material and its geometric characteristics when using thermal insulation to reduce heat losses from cylindrical surfaces. The results of the calculation of the thermal insulation of the pipe are presented graphically. The performed analysis allows us to formulate a generalized conclusion: a rational choice of insulation is possible only if an increase in its thickness is accompanied by an increase in the thermal resistance of the entire model.
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