利用液体夹心法测量LiF单晶高压热导率  

Thermal conductivity of shocked LiF single crystal measurement by liquid sandwich method

作　　者：赵万广[1] 周显明[1] 李加波[1] 李俊[1] 曾小龙[1] 

机构地区：[1]中国工程物理研究院流体物理研究所冲击波物理与爆轰物理重点实验室,绵阳621900

出　　处：《原子与分子物理学报》2014年第1期140-148,共9页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金NSAF项目(U1230202);中国工程研究院流体物理研究所冲击波物理与爆轰物理重点实验室基金(9140C670402120C670 6)

摘　　要：提出了液体夹心法热导率测量技术,采用CHBr3液体作为夹心材料实现了样品/窗口界面的理想接触,并将动载荷作用下的夹心法高压热导率实验测量压力下限拓展至40GPa,为绝缘介电晶体高温高压热导率测量提供了技术支持.实验利用平面碰撞和DPS测试技术,结合液体夹心法实测了LiF单晶高压热导率数据,对现有热导率理论模型进行了研究和探讨,结果显示,在γ/γ0=(ρ0/ρ)2时,修正后的Roufosse理论公式与实验数据符合较好,这一研究结果为非透明材料冲击波温度测量中的热传导修正提供了实验数据和理论模型.A liquid sandwich method which can be used to the measurement of thermal conductivity in shocked dielectric crystals has been proposed. By using liquid CHBr3 as the sandwich material, the above method can achieve ideal contact between sample and window and extend the lower limit of the shocked thermal conductivity measurements to 40 GPa compared with the traditional sandwich method. Based on the liquid sandwich method, the high pressure thermal conductivities of LiF single crystal are determined by using the plate impact and Doppler Pin System（DPS） measurement technology. With the measured thermal conductivities of shocked LiF, we compare various theoretic models of thermal conductivity and find that the correctional Roufosse theory can fit well with the measured high pressure thermal conductivities of LiF single crystal when γ/γ0 = （ρ0/ρ）2. These results will be beneficial to the shock wave temperature measurement of metals and provide a foundational data or theoretic model for its thermal conductive correction.

关 键 词：液体夹心法 LiF单晶 高压热导率 Roufosse理论 

分 类 号：O432.1[机械工程—光学工程]