Preparation And Properties Study Of Carbon Fiber Thermal Conductive Composites By Forced Assembly

In order to prepare composite materials with high thermal conductivity,this paper changes the commonly used blending molding method, puts forward the forced assembly method, strengthens the forced assembling degree by space limit. In this paper, three kinds of composite materials with single filler filled with UV (UV), single filler filled with polydimethylsiloxane(PDMS) and binary filler were prepared by forced assembly method. Firstly,the principle of forced assembly method is introduced to study the effect of filler content and forced assembling degree on the thermal conductivity of carbon fiber / UV composites. And the distribution of carbon fibers in the cross section of the composites was observed by electron microscopy (SEM).The Secondly, carbon fiber / PDMS composites prepared by forced assembly were used to study the effect of filler content on the thermal conductivity. The effects of forced assembly on the vertical and horizontal thermal conductivity were studied. The cross section of the composite was observed by SEM, and the distribution of the filler in the matrix was observed. Finally, the binary packing was used to prepare PDMS by forced assembly method. The effects of the kind and content of binary filler on the thermal conductivity of the composites were studied. The influence of forced assembling degree on the vertical and horizontal thermal conductivity of binary packing composites was studied, and the cross section was observed by SEM.The results show:1. Compaction method was used to prepare single filler filled UV composites, and its thermal conductivity increased with the increase of filler content and forced assembling degree. The carbon fiber content increased from 4wt% to 8wt%, and the vertical and horizontal thermal conductivity increased by 24.49% and 77.45% . Carbon fiber content is the same, forced to increase the degree of assembly, vertical and horizontal thermal conductivity were increased by 25.42% and 129.63% .SEM observation of the cross-section found that the filler content and forced assembly strength increases the carbon fiber becomes more closely.2. The forced packing method was used to prepare PDMS composites with single filler, and its thermal conductivity increased with the increase of filler content and forced assembling degree. Forced assembly of the thermal conductivity of the increase has a very big impact, relative to improve the filler content, forced assembly more effectively improve the thermal conductivity. When the content was increased from 10wt% to 23wt% at 750?m,the vertical and horizontal thermal conductivity increased by 228%and 235.42% .The carbon fiber content is 23wt%, the degree of forced assembly is increased, the thickness is reduced from 750?m to 150?m, and the vertical and horizontal thermal conductivity is increased by 164.52% and 316.15% respectively.3. Compaction method was used to prepare binary filler-filled PDMS composites, and its thermal conductivity increased with the increase of filler content and forced assembling degree.The 10wt% carbon fiber and graphene filled, forced to increase the degree of vertical and horizontal thermal conductivity were increased by 151.72%, 175.21%.10wt% carbon fiber filled with carbon nanotubes, forced to increase the degree of vertical and horizontal thermal conductivity were increased by 150%, 480.29%. 15wt% carbon fiber and graphene filled matrix, forced assembly increased, vertical and horizontal thermal conductivity increased by 131.43%, 491.59%.15wt% carbon fiber and carbon nanotubes filled with matrix, forced to increase the degree of vertical and horizontal thermal conductivity were increased by 137.84%, 662.74%.4. In this paper, the forced assembling method is more effective than the method of increasing the thermal conductivity, and the increase of the thermal conductivity in the horizontal direction is several times higher than that of the method, and verify the effectiveness of the mandatory assembly principle. In the method of forced assembly, a thermally conductive composite with good thermal conductivity was prepared, and the carbon fiber filled content was 23wt%, the horizontal thermal conductivity was 13.40W (mK)-1 For binary filler composites, 15 wt% carbon fibers were mixed with 4 wt% carbon nanotubes,the horizontal thermal conductivity was 11.67 W (m K)-1.