Study on modification and design of thermal conductive and microwave absorbing dual-functional powders
A type of thermal conductive and microwave absorbing dual-functional powders were designed with different ra-tios and particle sizes using aluminum oxide(Al2O3)as thermal conductivity powders,sendust(FeSiAl)as microwave absorbing powders,and dodecyltriethoxysilane(C12)as a modifier.The resultant dual-functional powders were filled in a silicone oil to prepare a thermal conductive and microwave absorbing pad,thus developing a series of thermal conductiv-ity absorbing dual-function integrated materials.The results indicated that C12 generated a good lipophilic modification effect on Al2O3 and FeSiAl.The thermal conductive and microwave absorbing pad showed a thermal conductivity of 5.92 W/(m·K)at a Al2O3/FeSiAl mass ratio of 20∶80,exhibiting a good absorbing capability in the frequency range of 4.8～6.5 GHz.Ensuring a high thermal conductivity,the as-prepared powders were endowed with a wave-absorbing ca-pability.Meanwhile,it is easy for the powders to be compressed and convenient for practical assembly applications,and their 50-psi compression stress reached a compression strain of 50% .
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