Effect of different TiO2 crystal forms on recovery characteristics of PTCR start-up elements

titanium dioxide;  thermistors;  crystal form;  recovery time;  Temperature coefficient

The reasons for the difference in recovery time between domestic and Japanese PTCR (thermistor) components as refrigerator compression starters were analyzed. In the experiment, TiO2 of Japanese rutile structure and domestic anatase structure were taken as raw materials, and PTCR samples were prepared by reacting with the same domestic BaCO3 powder and using the same electronic ceramic sintering process. Analyzing the resistance-temperature characteristic curve of the starting element, it was found that the temperature coefficient αT of the domestic PTCR element at high temperature was lower than that of the Nissan sample, and the longer recovery time of the domestic starter was due to the fact that the main raw material TiO2 for the preparation of the domestic sample was anatase structure, while the Nissan sample was rutile structure. The crystal structure of TiO2 powder has a certain effect on the resistance temperature coefficient of BaTiO3-based PTCR materials.