Study on temperature control characteristics of low-resistivity ceramic-based PTC material
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摘要:
常温居里点陶瓷基正温度系数材料在常温段热控领域具有广阔应用前景，但其存在低温区电阻率过大的问题。基于此，以Ba0.64Sr0.36TiO3为基体并采用固相烧结工艺，研制出低温区电阻率为800 Ω·cm的常温居里点PTC材料，分别利用实验和仿真手段对其温控性能进行研究。结果表明：在低温、低电压工况下，该材料可将受控体温度迅速维持在25.6 ℃附近，而其他加热元件控制温度均偏离常温。该材料热控响应时间少于其他加热元件的50%。在−5~5 ℃的周期性变化环境中，该材料控温波动幅度最小，只有2.1 ℃。在真实低温环境下，该材料能将受控体温度快速升至约22.3 ℃，在12 h内温度波动不到2 ℃，有效抑制了外界环境对热控过程的干扰。
Abstract: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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图 2 电阻-温度特性测试结果与拟合结果对比
Figure 2. Comparison of resistance-temperature characteristic test results and fitting results
图 5 −10 ℃、20 V电压下Rcon和R4温控表现对比
Figure 5. Comparison of temperature control performance of Rcon and R4 at 20 V and −10 ℃
图 6 不同工况下的实验值与计算值对比
Figure 6. Comparison of experimental and calculated values under different working conditions
图 7 −10 ℃、20 V电压下R1和R2温控曲线
Figure 7. Temperature control curves of R1 and R2 at 20 V and −10 ℃
图 8 −20 ℃、12 V电压下不同低温电阻、居里点材料温控曲线
Figure 8. Temperature control curves of different low-temperature resistor and Curie point materials at −20 ℃ and 12 V voltage
图 9 温控目标相同时不同材料的温控曲线
Figure 9. Temperature control curves of different materials when temperature control target is the same
图 10 实际低温天气条件下不同材料温控对比
Figure 10. Comparison of temperature control of different materials under actual low-temperature weather conditions
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