稳态法研究液态金属强化界面传热的特性

Study of heat transfer characteristics of liquid metal reinforced interface by steady-state method

通过建立有效的热界面测试系统来研究低熔点的镓铟锡液态金属(LMAs),进而探究低熔点液态金属作为热界面材料对界面传热性能的影响,并分别对纯液态金属(PLMA)、氧化后镍粉质量分数为5wt%混合液态金属(OLMA5wt%Ni)以及氧化后磁场作用下镍粉质量分数为5wt%混合液态金属(BOLMA5wt%Ni)进行探究,实验结果显示3种热界面材料的导热系数分别为11.47 W/(m·K)、18.02 W/(m·K)、10.89 W/(m·K)。分析可知加镍粉后对液态金属的传热效果有了很大的提升,相比纯液态金属导热系数提高了50.17%。实验也得到了3种不同热界面材料的界面热阻分别为18.933 mm2·K/W、6.662 mm2·K/W、19.504 mm2·K/W。与纯铜板直接接触相比接触热阻分别降低了84.20%、94.45%、83.73%。

An effective thermal interface testing system was established to study the low melting point of gallium indium tin liquid metal(LMAs).The influence of low-melting-point metal liquid as a thermal interface material affect the performance of the interface heat transfer was inverstigated.The research materials inclued pure liquid metal(PLMA)mixed liquid metal with 5 wt%nickel oxide(OLMA5wt%Ni)and mixed liquid metal with 5 wt%nickel oxide under magnetic field(BOLMA5wt%Ni).The experimental results show that the thermal conductivities of the three thermal interface materials are 11.47 W/(m·K),18.02 W/(m·K)and 10.89 W/(m·K),respectively.It can be seen from the analysis that the heat transfer effect of liquid metal is greatly improved after the addition of nickel powder,compared with that of pure liquid metal,the thermal conductivity is increased by 50.17%.The experimental results also show that the interfacial thermal resistance of three different thermal interface materials are 18.933 mm2·K/W、6.662 mm2·K/W and 19.504 mm2·K/W,respectively,and the contact thermal resistance were reduced by 84.20%、94.45%and 83.73%.