不同无机填料对导热硅脂热导率的影响研究

Different Kinds of Inorganic Fillers on the Thermal Grease Effect on Thermal Conductivity

用无机填料填充硅油可以制备优良的导热硅脂,并且显现出广阔的发展前景。笔者在阐述硅脂导热机理和理论分析的基础上,在玻璃反应釜中,温度为120℃,抽真空2h的条件下,制备了硬脂酸锌表面处理的球形氧化铝导热硅脂、不同粒径导热硅脂、不同种类填料填充的导热硅脂(包括氮化铝,碳化硅,石墨)和二元混合填充导热硅脂,分析了硬脂酸锌表面处理、填充比例、粒径大小等因素对单组分导热硅脂热导率的影响以及增强填料与主填料之比对二元混合填充导热硅脂热导率的影响,通过测试导热硅脂热导率来比较导热性能的好坏,并分析了试验中出现的工艺性问题。

Inorganic fillers can be used to make excellent thermal conductivity silicone grease,and showed broad prospects for development.This article studies the mechanism of thermal grease and theoretical analysis,and under the guidance of this theory,in the glass reaction kettle at temperature 120℃,evacuated for 2 hours and prepared kinds of spherical aluminum treated by zinc stearate thermal grease,different types of fillers thermal grease（including aluminum nitride,silicon carbide,graphite）and binary mixture of thermal grease,and analyzed the effect of zinc stearate surface treatment,filling ratio,particle size etc factors on the one-component thermal grease thermal conductivity as well as the effect of reinforcing filler and main filler of the ratio on the thermal conductivity of binary mixture thermal grease,and tested the thermal conductivity of silicone grease to compare good or bad,and analyzed the manufacturability problems appeared in the test.