The preparation and properties of nano carbon coated cobalt / poly two methyl siloxane composite thermal interface materials-Iota

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Service > The preparation and properties of nano carbon coated cobalt / poly two methyl siloxane composite thermal interface materials

The preparation and properties of nano carbon coated cobalt / poly two methyl siloxane composite thermal interface materials

Abstract: With primarily vinyl terminated polydimethylsiloxane (PDMS) as matrix , filled with carbon coated cobalt nanoparticles (Co@C), carbon coated cobalt/polydimethylsiloxane (Co@C/PDMS) composite thermal interface material was prepared by using the method of ground co-blend. TEM, XRD, Raman, and SEM were employed to analyze the microstructure, phase, degree of graphitization and dispersibility of Co@C respectively. The effects of filler content on thermal conductivity, thermal stability, electrical conductivity, and flexibility of composite were investigated. The results show that the thermal conductivity of the thermal interface material increases with increasing the Co@C content, and the maximum value reaches 1.6386 W/(m·K) that is a 10.5-time increase over neat silicone when the mass fraction of filler reaches 24 wt.%, TGA indicates that the composite with 24 wt.% Co@C has a higher initial decomposition temperature Ti and final decomposition temperature Tf of about 70 oC and 80 oC respectively, accounting for the superior thermal stability of the composite with 24 wt.% Co@C . The electrical conductivity of the thermal interface material increases nonlinearly with increasing the Co@C nanoparticles content. The maximum value of electrical conductivity is 9.38×10-3 S∙m-1, and the threshold value of composite is 10 wt.% through the method of fitting, that means the insulativity of composite is perfect when the filler content is less than 10 wt.%. The range of Shore hardness A is from HA 17.6 to HA 26.8, indicating that the composite has a moderate hardness and a perfect flexibilit. Therefore，the composite with 24 wt.% can not only meet electrical property of thermal interface material basically, but has favorable performances of heat conductivity, thermal stability and flexibility.

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