RESEARCH OF THE IMPACT OF SYNTHESIZED BY HIGH-VOLTAGE ELECTRICAL DISCHARGE POWDER CHARGE ON HEAT-TRANSFER PROPERTIES OF EPOXY COMPOSITES USED FOR SHIP REPAIR
https://doi.org/10.33815/2313-4763.2019.2.21.142-153
Abstract
The prospects of polymer composites utilization for major overhaul or current repairs have been proven. This enables considerable improvement of stress-related, heat-transfer, anticorrosive and other operational properties of complexes and mechanisms under static and dynamic loads stress. The utilization of polymer composite materials (СM) based on epoxy binders, dispersed and fibrous fillers is of great importance. Such materials possess good handling properties, when applied to parts with intricate shape of surface, and high operational properties, including heat-transfer properties, under the specified operating contingencies. It proves to be impossible to develop new materials with improved heat-transfer properties without carrying out research of their operational characteristics. Unfortunately, insufficient attention has been paid to study the impact of interfacial phenomena in formation of composites on their properties, especially with microdispersed fillers introduction. Physical and chemical processes happening during formation of materials at the interface, cover the entire complex of reactions of interaction of oligomer macromolecules with the specific sites on the surface of the filler. This gives places to the formation of materials with high operational characteristics, which are controlled by technological modes of composites formation.
The prospects of polymer-based materials utilization have been proved in the current study. Taking into account the fact, that developed composites are quite effective when used for protection of equipment, which is operated at elevated temperatures, the research has been conducted in order to determine the impact of nature and content of synthesized by high-voltage electrical discharge powder charge on heat-transfer properties of epoxy composites. Epoxy dian oligomer has been selected to be the main component for the binder during composites formation. Polyethylenepolyamine hardener was used for crosslinking of epoxy compositions, which allows materials to be hardened at room temperatures. The selection of synthesized by high-voltage electrical discharge powder charge for improving the heat-transfer properties of developed materials has been proved. Thermal linear expansion coefficient and heat resistance of epoxy composites have been investigated.
The critical filler concentration has been established, the introduction of which reduces the thermal linear expansion coefficient of the developed composites when compared to the parent epoxy matrix. Thermal range analysis is of scientific and practical interest, which covers the glass transition area of polymer composites. It has been shown that at the given temperature range, the thermal linear expansion coefficient of the materials is also considerably lower when compared to the parent matrix.
In terms of conducted tests of heat-transfer properties of materials filled with the synthesized by high-voltage electrical discharge powder charge, the permissible temperature limits for developed composites utilization have been established.
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