Temperature resistance characteristics of carbon fiber electric heating elements:
As a fibrous material with high carbon content, carbon fiber has been widely used in the field of aerospace and electric heating due to its excellent heat radiation performance. The application of carbon fiber as an electric heating element JAYE INDUSTRY has developed a variety of heating equipment for various carbon materials such as snow melting and baking. The resistance stability of carbon fiber components during operation plays an important role in the improvement of their service life. The temperature resistance characteristics of several different types of carbon fiber electric heating elements are analyzed and the mechanism is analyzed. The electric heating characteristics of carbon fiber electric heating elements are studied and prepared. Process optimization has guiding significance.
1- Sample preparation and experimental methods:
Sample type and preparation: T300 carbon fiber is selected as the raw material for the preparation of the carbon fiber electric heating element, and the line type of the electric heating body is changed by adjusting the fiber specification and the number of strands. The supporting core heating element uses the single-strand and multi-strand twisting process; no supporting core heating element It is made by high-temperature shaping with a suitable concentration of glue; the carbon felt heater is made of domestic viscose-based short fiber. The vacuum packaging of various electric heating elements is assisted by its Electric Heating Equipment Co., Ltd., and all the components to be tested have undergone life testing and various work inspections. Experimental method Different types of carbon fiber electric heating elements are fixed on a self-made device to test the resistance temperature characteristics. Use voltmeter and ammeter to test the voltage and current of the sample; the resistance of the component in the working state is measured by voltammetry; the surface temperature of the working state is sensed by the TM-680lB high temperature point thermometer, and the temperature measurement point is located at the effective radiation working length of the component The central position of the component; the voltage, current, temperature and other experimental data of the components are collected and recorded by a Keithlcy2700 data logger.
2 Results and discussion: The resistance stability of the electric heating element is an important indicator for evaluating the quality of the element. R is the cold resistance of the carbon fiber electric heating element, and R is the working resistance of the carbon fiber electric heating element.
2.1 The influence of the support core on the temperature resistance characteristics of carbon fiber electric heating elements: The influence of the support core on the temperature resistance characteristics of carbon fiber elements is compared. The comparison results of the two linear heating elements found that the resistance temperature change range of the coreless element is significantly reduced compared with the cored element, which can be comparable to the carbon felt heating element. This shows that the existence of the support core is not conducive to the stability of the carbon fiber heating resistance. The improvement of the coreless carbon fiber components prepared by a reasonable knot process can improve the disadvantages caused by the support core.