Study on the Performance of Spherical Alumina and Thermal Conductive Silicone Rubber Screening by Tapping Method
Thermally conductive silicone rubber(TCSR)is widely used to promote heat dissipation in electronics and energy storage devices.The compounding of alumina of different particle sizes can produce the synergistic effects and improve the performance of TCSR.A new method(the tapping method)for rapid screening of alumina to optimize the compounding ratio and investigates its effectiveness in the application of spherical alumina,and the TCSR with these fillers.Spherical alumina with the average particle sizes of 40 μm and 5 µm,respectively,is used as the thermally conductive fillers.The densest stacking state is screened out to be 16∶4 by the tapping method.Based on the optimum ratio(16∶4)and four similar ratios,five TCSRs are prepared.When the optimal compounding ratio is 16∶4,the TCSR with this ratio has optimal properties compared to samples with other compounding ratios,and the 16+4@TCSR can achieve,low hardness(Shore OO 70),high thermal conductivity(3.3 W·m-1·K1),and high thermal reliability(less than 10％variation in most properties after 1 000 h of 135℃ accelerated thermal aging).In the research and development of TCSR,the use of the tapping method can significantly reduce the unpredictability,accelerate the speed of dispensing optimization,reduce the development time and the cost of raw materials.It is expected to provide the feasible and efficient strategy and tool for optimizing the performance,reducing costs,and increasing efficiency of TCSR.
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