4th WCSET-2015 at Japan

 

Mechanical Engineering:

Title:          Thermal Conductivity Measurement of Rubber Added with Carbon Nanofibers using Plate Comparative method
Authors:      Masaaki Okuyama, Toshio Tomimura
Abstract:     Thermal and electrical conductive composite materials added with fine metal particles are widely used as a thermal interface material (TIM). Reflecting such circumstances, more and more studies have been done recently on carbon nanotube and/or nanofiber composites, since they have high thermal and electrical conductivities. A series of experimental studies have been carried out on the effect of carbon nanofiber addition on the thermal conductivity of ethylene propylene rubber (EPDM) using the plate comparative method. In the experiments, however, reliable results could not be obtained due to failing in improving the accuracy of the measurement system. Therefore, in this study, we re-examined the thermal conductivity measurement system thoroughly. That is, we reselected the reference rod, and reconsidered the thermal insulation method, the evaluation method of heat transfer rate by the heater and so on. Furthermore, a series of numerical simulations were conducted under the same conditions as the present measurement system. As a result, following findings have been obtained: (1) when the thermal conductivities of the reference rod and the sample to be measured are almost the same, the temperature field in each rod deviates considerably from the 1-D distribution. On the other hand, (2) when the thermal conductivity of the reference rod is larger one order of magnitude than that of the sample, the almost ideal 1-D temperature distribution is formed in each rod. Taking those results of reexamination and the investigation into account, the thermal characteristics of the EPDM added with 14 wt.% CNF (CNF14), the EPDM added with 33 wt.% CNF (CNF33), and the EPDM added with 14 wt.% carbon black (CB14) were measured. Here, the bulk density of CNF used in the present study was 0.04 g/cm3. As a result, it has been found that the thermal conductivity of CNF33 is the highest among the tested four samples. That is, with increase in the amount of carbon nanofiber, the thermal conductivity of the sample becomes high under the present experimental conditions.

Keywords:   Thermal Conductivity, Plate Comparative Method, Rubber, Carbon Nanofibers, Thermal Interface materials
Pages:          091-094

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