| Citation: | SANG Z K，ZHAO R，CHENG W L. Study on temperature control characteristics of low-resistivity ceramic-based PTC material[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（8）：2147-2153 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0602
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The room temperature Curie point ceramic-based positive temperature coefficient material has broad application prospects in the field of thermal control at room temperature, but it currently has the problem of large resistivity in the low-temperature region. Based on this, by using Ba0.64Sr0.36TiO3 as the matrix and adopting a suitable sintering process, a room-temperature Curie point PTC material with a resistivity of 800 Ω·cm in the low-temperature region was developed. Then, the thermal control performance is studied by experiment and simulation respectively. The results show that under low temperature and low voltage conditions, the prepared material can quickly maintain the temperature of the controlled body near 25.6℃, while the control temperature of other heating elements deviates from normal temperature. Additionally, compared to conventional heating elements, the material’s thermal control response time is less than half as fast. In the periodic environment of −5~5 ℃, the fluctuation range of thermal control is the smallest, only 2.1 ℃. In the actual low-temperature environment, the material can still quickly raise the body’s temperature to roughly 22.3 °C, and the variation is less than 2 °C over the course of 12 hours, effectively suppressing the influence of the external environment with the thermal management process.
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