Szymiczek Małgorzata, Buła Dawid
Department of Theoretical and Applied Mechanics, Silesian University of Technology, 44-100 Gliwice, Poland.
Ośrodek Pomiarów i Automatyki S.A., 41-800 Zabrze, Poland.
Materials (Basel). 2022 Mar 15;15(6):2171. doi: 10.3390/ma15062171.
Composite materials are still finding new applications that require the modification of various properties and are characterized by the summary impact on selected operational features. Due to the operating conditions of electrical equipment enclosures in potentially explosive atmospheres, the surface resistivity ensuring anti-electrostatic properties, i.e., below 10 Ω and resistance to the flame while maintaining appropriate operational enclosure properties is very important. It is also crucial to dissipate heat while reducing weight. Currently metal or cast-iron enclosures are used for various types of electrical devices. As part of the work, a material that can be used for a composite matrix for the enclosure was developed. The study aimed to assess the influence of selected fillers and chemical modifications on the thermal conductivity coefficient, resistivity, and strength properties of matrix materials for the production of electrical device enclosures used in the mining industry. Selected resins were modified with graphite, copper, and carbon black. Tests were carried out on the coefficient of thermal conductivity, surface resistivity, flammability, and flexural strength. At the final stage of the work, a multi-criteria analysis was carried out, which allowed the selection of a composite that meets the assumed characteristics to the highest degree. It is a vinyl ester composite modified with 15 wt.% MG394 and 5 wt.% MG1596 graphite (W2). The thermal conductivity of composite W2 is 5.64 W/mK, the surface resistivity is 5.2 × 10 Ω, the flexural strength is 50.61 MPa, and the flammability class is V0.
复合材料仍在不断寻找需要改变各种性能的新应用，其特点是对选定的操作特性具有综合影响。由于电气设备外壳在潜在爆炸性环境中的运行条件，确保抗静电性能（即表面电阻率低于10Ω）以及在保持适当的外壳操作性能的同时具备阻燃性非常重要。在减轻重量的同时散热也至关重要。目前，各种类型的电气设备使用金属或铸铁外壳。作为这项工作的一部分，开发了一种可用于外壳复合基体的材料。该研究旨在评估选定的填料和化学改性对用于采矿业电气设备外壳生产的基体材料的热导率系数、电阻率和强度性能的影响。选定的树脂用石墨、铜和炭黑进行改性。对热导率系数、表面电阻率、可燃性和弯曲强度进行了测试。在工作的最后阶段，进行了多标准分析，从而能够选择出最符合假定特性的复合材料。它是一种用15 wt.%的MG394和5 wt.%的MG1596石墨改性的乙烯基酯复合材料（W2）。复合材料W2的热导率为5.64 W/mK，表面电阻率为5.2×10Ω，弯曲强度为50.61 MPa，可燃性等级为V0。
