The influences of the PTCR's characteristic parameters such as switching temperature, room resistance of samples, and dissipation coefficient, etc. on the thermal power of heaters are investigated.
主要研究了PT C材料的开关温度、样品的室温电阻及耗散系数等特性参数对发热体功率的影响。
Hypereutectic Al-Si alloy which has small proportion, low coefficient of thermal expansion, good wear resistance and dimensional stability is an ideal piston material.
过共晶铝硅合金比重小、热膨胀系数低、耐磨性和体积稳定性好，是理想的活塞材料。
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