Виконано порівняльні дослідження триботехнічних характеристик полімерного композитного матеріалу «Moglice» і розробленого матеріалу ДК-6. Випробування виконувалися на парах тертя «чавун-моглайс» і «чавун-ДК-6». Дослідження необхідні для практичного застосування матеріалів ДК-6 або «Moglice» при відновленні зношених поверхонь тертя. Отримано позитивні результати порівняльних випробувань полімерного композитного матеріалу ДК-6 в порівнянні з «Moglice» Ключові слова: напрямні ковзання верстатів, триботехнічні характеристики, полімерні композитні матеріали, коефіцієнт тертя Выполнены сравнительные исследования триботехнических характеристик полимерного композитного материала «Moglice» и разработанного материала ДК-6. Испытания выполнялись на парах трения «чугун-моглайс» и «чугун-ДК-6». Исследования необходимы для практического применения материалов ДК-6 или «Moglice» при восстановлении изношенных поверхностей трения. Получены положительные результаты сравнительных испытаний полимерного композитного материала ДК-6 по сравнению с «Moglice» Ключевые слова: направляющие скольжения станков, триботехнические характеристики, полимерные композитные материалы, коэффициент трения
This paper reports the results of studying epoxy compositions with gypsum taken in the form of dispersed powders in the original and water-hardened form. The exact pattern has been shown in the way the introduction of a gypsum additive in the amount of 50 % by weight affects the strength, chemical stability, and morphology of the composites. Under conventional heat treatment (60-110 °C) of the hardened composites, the maximum stress at compression σ m and the elasticity module at compression Е с , as well as wear resistance, decrease after the introduction of gypsums (of both types). At the same time, after a hard (destructive) heating at 250-260 °C, the elasticity module Ес of the hardened composites increases. The maximum stress at compression σ m is also increased. The same applies to the wear resistance, which grows especially noticeably after 250 °C. The micro-hardness after filling is prone to increase but the fragility of epoxy-gypsum composites does not make it possible to measure it when a punch (a steel hemisphere) penetrates it deeper than 20 μm. However, after the heat treatment at 250-260 °C, the unfilled polymer, on the contrary, is embrittled while the filled ones are plasticized, thus showing a high micro-hardness at significant (30-50 μm) immersion. The composites with gypsum, in contrast to the unfilled ones, do not disintegrate in acetone and retain integrity at any aging duration (up to 75 days and beyond). In this case, the original gypsum produces a composite with less swelling in acetone than the hardened gypsum. Based on the data from atomic-strength microscopy (ASM) microscopy, the morphologies of the non-filled composite, the composites with the hardened gypsum and original gypsum are different. The original gypsum forms a composite with a more pronounced (possibly crystalline) filler structure; the morphology for the hardened composite reflects the distribution of inert particles; for the unfilled composite (H-composite), only pores are visible against the background of a relatively smooth relief
Guides (linear plain bearings) of reciprocating motion are widely used in many areas of human activity. However, at present there are no reasonable methods for their calculation, in particular metal-polymer guides. The author's method of contact strength calculation of cylindrical metal-polymer sliding guides is presented in the article. The effect of load, bushing diameter and radial clearance on the maximum contact pressures and their distribution in the guide was studied on the example of epoxy-based polymer composite material Moglice of the German company DIAMANT Metallplastic GmbH, which is used to restore tribotechnical sliding systems elements. Quantitative and qualitative regularities of dependence of contact pressures on the accepted factors of influence are established: at loading increase four times the maximum contact pressures and contact angles will increase twice irrespective of change of sizes of a radial clearance and diameter of a base; increasing the base diameter leads to a directly proportional decrease in maximum contact pressures; doubling the radial clearance leads to a √2 -fold increase in pressure, regardless of changes in the magnitude of the load and the diameter of the base. Regularities of change of contact parameters from the specified factors are given graphically.
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