超细铜粉的分散及其在导热膏中的应用

Dispersionand Application in Thermal Paste of Ultrafine Copper Powders

在测量超细铜粉Zeta电位的基础上,选用SHMP、OA、SDBS、PVP、PEG五种分散剂,研究超声时间和分散剂浓度对超细铜粉在无水乙醇中分散性能的影响,以及超细铜粉的加入量、粒径、不同粒径铜粉复配等对导热硅脂导热性能的影响。结果表明,在无水乙醇中添加3%的SHMP超声50 min,铜粉分散效果最好。随着超细铜粉添加量的增加和粒径的增大导热膏的导热系数均先增大后减小。当超细铜粉的总加入量为33%,82 nm和800 nm的铜粉以3∶1进行复配,导热膏的导热性能最优,导热系数最大为1.413 W/m·K。

On the basis of Zeta potential measurement of the ultrafine copper powders,the effects of supersonic time and the concentration of the dispersant on the dispersing property of the powders in alcohol solvent are investigated by using SHMP,OA,SDBS,PVP,PEG as the dispersants. The effects of the ultrafine copper powders dosage,particle size and compound proportion on the thermal performance of thermal paste are discussed. The results show that the optimal dispersing condition is 4% SHMP with50 min ultrasonic dispersing time. With the increase of the ultrafine copper powders particle size and dosage,the thermal performance of thermal paste is increased firstly and then is decreased. The optimal thermal performance is achieved,the maximum thermal conductivity is 1. 413 W / m·K,when the total amount of the copper powders dosage is 33% of thermal paste system,and the ratio of the ultrafine copper of 82 nm to 800 nm is 3∶ 1.