Abstract
Curing resin matrix composite quickly constitutes one of the key technologies for industrial lightweight production, especially in automobile manufacturing and aircraft maintenance. In this study, a novel gap coaxial line microwave combined ultraviolet radiator is proposed for epoxy resin curing. With the same power of 100 W, epoxy resin is cured both by the proposed radiator working at a microwave frequency of 2.45 GHz and single ultraviolet. Respectively, the ultraviolet radiation and microwave combined ultraviolet radiation are measured. The microwave radiation and plasma absorption of this radiator is close to 3:4 by simulation and experiment. In addition, experimental results indicate that the processing time using this radiator is 3.6 times shorter than using single ultraviolet. The toughness and adhesiveness of the epoxy resin after curing are compared by scanning electron microscope and X-ray diffusion, and the fracture surface of the cured epoxy resin demonstrates that microwave combined ultraviolet curing is more effective.
Highlights
Epoxy resin is one of the most important collective materials for the preparation of highperformance composites, which can endow the composites with good mechanical and physical properties
To verify our simulation model, we calculate the energy density of the UV spectrum at 254 nm and the leaked MW using the following formula: wUV = ρUV ds wMW = ρMW ds where wUV and wMW represent the power density of UV and MW, respectively; ρUV and ρMW refer to the UV and MW power flow per unit area, respectively, which can be measured by the spectrograph and MW detector; and S is the surface at the same position around the radiator
This article proposed a MW combined UV radiator with a non-uniform gap structure working at the frequency of 2.45 GHz and power of 100 W to cure epoxy resin
Summary
Epoxy resin is one of the most important collective materials for the preparation of highperformance composites, which can endow the composites with good mechanical and physical properties. Chen M H11 and Liu X Q12 studied curing time at different heating temperatures and the effects of curing at different MW powers. We designed a UV-based and MW-assisted radiator for curing epoxy resin. This radiator utilizes a non-uniform slotted coaxial line structure to cure epoxy resin. Experimental results of epoxy resin curing indicate that this radiator can augment the curing speed of epoxy resin and achieve desirable curing properties, including toughness and adhesiveness. Thereby, this radiator is quite promising for utilization in curing coatings
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