Abstract
Silicone rubber(SR)composites are most widely used as thermal interface materials(TIMs)for electronics heat dissipation.Thermal impedance as the main bottleneck limiting the performance of TIMs is usually neglected.Herein,the thermal impedance of SR composites load-ed with different levels of hexagonal boron nitride(h-BN)as TIMs was elaborated for the first time by the ASTM D 5470 standard test and finite el-ement analysis.It was found that elastic modulus and surface roughness of SR composites increased with the increase of h-BN content,indicating that the conformity was reduced.When the assembly pressure was 0.69 MPa,there existed an optimal h-BN content at which the contact resis-tance was minimum(0.39 K·cm2·W-1).Although the decreased bond line thickness(BLT)by increasing the assembly pressure was beneficial to re-duce the thermal impedance,the proper assembly pressure should be selected to prevent the warpage of the contact surfaces and the increase in contact resistance,according to the compression properties of the SR composites.This study provides valuable insights into fabrication of high-performance TIMs for modern electronic device applications.
基金项目
Sichuan Science and Technology Program(2022YFH0090)
Fundamental Research Funds for the Central Universities()
维普
万方数据