Improving the distribution uniformity of surface hardness of the cured CFRP molniezaschita coating during processing in a microwave field elektromagnitnom

Abstract

In the structural elements of advanced air transport and wind turbines are widely used fiber-reinforced polymer composite materials: carbon and fiberglass. In order to increase the resistance of materials to static electricity and lightning discharges, lightning-proof coatings are included in the structure of the polymer composite materials. In the process of operation, there may be collisions of the plumage and planes of aircraft, as well as large-sized blades of wind turbines with solid objects. Therefore, along with the strength and resistance to high-amplitude low-cycle loads, one of the important characteristics of polymer composite materials that determine their performance properties is hardness. Strength and endurance of polymer composite materials products can be increased by short-term exposure to microwave electromagnetic field. The presence of a built-in metal structure introduces additional uncertainty in the perception of anisotropic polymer composite materials operating loads, as well as in the process of interaction with the electromagnetic field of ultrahigh frequency. The studies of the hardness distribution on the surface of carbon plastics with built-in lightning-proof coatings under different schemes of exposure to microwave electromagnetic field: from the lightning-proof coatings, from the side opposite to the lightning-proof coatings, sequential processing on both sides compared with the starting material. It is found that processing in a microwave electromagnetic field with an energy flux density (17-18) ×104 mW/cm2 for 2 minutes leads to a significant increase in the uniformity of the initial hardness of the surface of the samples.