Микроволновые устройства термообработки стержневых диэлектрических материалов
Theoretical and experimental research results in the field of highly effective rod material's with low thermal conductivity microwave heat treatment technologies are presented. Rods made of polymeric composite materials are used as reinforcement in construction industry. Proposed microwave throughout the volume uniform heating method of the dielectric rod removes the internal thermal stresses in the process of polymerization reactions. Volumetric heating of the dielectric rods leads to fullness of polymerization and high quality of products. A loaded long line with given boundary conditions was used as a model of microwave device with the
processed material. Microwave device, consisting of two different in design electrodynamic system sections with complementary temperature distribution over the cross section of a rod, was proposed for a highly efficient dielectric rods' with different diameters heat treatment. The first electrodynamic system (round waveguide) provides the maximum temperature along the axis of the dielectric rod and its decline along the radius to the outer surface of the rod. The second electrodynamic system (diaphragmatic waveguide slowwave structure) provides the maximum temperature on the outer surface of the rod, and its decline along the radius to the axis of the dielectric rod. The resulting temperature distribution over the cross section of a rod from the two sections of the microwave device should provide the temperature distribution over the cross section of a rod, which satisfies the technological process requirements. Experimental studies were carried out on the electromagnetic field frequency oscillations of 2450 MHz with a rod of 40 mm in diameter. Divergence of the theoretical and experimental crosssection temperature values of the rod does not exceed 6%, and the temperature deviation in the material rod does not exceed 8% from the nominal temperature value. Polymer composite materials' thermal conductivity is very small and their heat treatment with gas or other known methods does not lead to the entire volume uniformity of heating, which leads to various flaws in the finished products during production.