| 摘要 |
Provided are a ceramic material having heat-transfer performance that can change with temperatures, and a thermal switch including the same. A ceramic material has a characteristic length L a of a micro-structure thereof that satisfies 0.1L AMFP ‰¤L a ‰¤100L AMFP , and has thermal conductivity that monotonously increases from room temperature to 100°C, where L AMFP denotes apparent mean free path of phonons at room temperature, and is defined as L AMFP =(3× thermal conductivity)/(heat capacity×speed of sound). The characteristic length L a of the micro-structure is an interval between particles of different type of material when the ceramic material includes a composite material in which the different type of material is dispersed in a base material, is an interval between one pore and another pore when the ceramic material includes a porous body, and is the crystalline particle size (interval between one grain boundary and another grain boundary) when the ceramic material includes a polycrystalline body. |
