Experiment Study And Theory Analysis Of The Thermal Ability Of Carbon Black/rubber Composite System

While composite material with higher thermal conductivity are more and more widely used in indestry , the thermal conductive ability of composite material have become one of key performance indicators. In this paper the thermal conductivity of carbon/natural rubber composite material were studied by experimental and theoretical methods.Based on the former experiment recipes of our research team, effects of the carbon black (N234,N330,Hi-Black 40B2 and Acetylene)with different diameters and structures on the thermal conductivity of carbon black/rubber composite were studied here. Changing the carbon black volume fraction and mixing process, 76 kinds of rubber recipes were obtained. Traditional roll mixture and Haake and Nanoflash LFA447 laser thermal conductivity instrument were used in preparing the samples and mesurements of their thermal conductivity.It is found from experiment date that the thermal conductivity of composite changed with carbons black which changed in shares, diameters and structures. Thermal conductivity of different kinds of carbon black/rubber composite increased with the carbon black volume fraction rising; The smaller the diameters of carbon black, the greater the effect thermal conductivity of carbon black/rubber composite with the same carbon black shares; In the same carbon black volume fraction, the higher structure is good for thermal conductivity of carbon black/rubber composite material. When the volume of fillers is about 20%,the increase range of the thermal conductive ability of carbon black/rubber composite with Hi-Black 40B2 improved by bigger range.This paper analyzed the micro-configuration and distributing situation of the carbon black article by SEM Observations of the Structure of carbon black/rubber composite. The results showed that the carbon black article distributes evenly throughout fundamental entity and carbon aggregate were different. The small carbon aggregate play a role of interlinked and contributed to form thermal conductivity net chain, Thus improved the thermal conductivity.During the study of the thermal conductivity models and the thermal conductivity equations, we cited the thermal-electricity similar, mixture rules, minimum thermal resistance law and so on. Supposing that composite belongs to isotropy that the carbon article distributes evenly throughout. get the thermal conductivity theory model and the thermal conductivity equations.The thermal conductivity theory model compared with experimental date. We got that in the range of carbon volume fraction the thermal conductivity theory model was similar to experiment value, When carbon volume fraction was higher, the Sphere model was far from the experiment value. The improved model was better fit the carbon black/rubber composite thermal conductivity rule than the sphere model.By ADINA ,analyzing the effect of the different shape of fillers(such as Cube,Sphere,Cuboid) on the thermal conductivity of composite,when the shape of fillers was Cuboid the thermal conductivity of composite was higher;and comparing the result with Maxwell model. The results showed that,when the shape of fillers is Spherical, the thermal conductivity got by ADINA was close to the result of Maxwell model.