Heat dissipation composites prepared by carbon coated aluminum nanoparticles filled silicone rubber
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摘要: 以甲基乙烯基硅橡胶为基胶, 碳包铝(C-Al)纳米粒子为填料, 采用机械混炼法制备了散热用C-Al/硅橡胶复合材料。采用SEM研究了C-Al纳米粒子在硅橡胶中的分散情况; 并研究了填料对复合材料热导率、热膨胀系数(CTE)和热稳定性的影响。结果表明: C-Al纳米粒子在硅橡胶中分散性良好; C-Al/硅橡胶复合材料的热导率随C-Al填充量的增加而增大, 填充体积分数超过50%时热导率开始下降, C-Al适宜用量为总体积的50%; 随着填料的增加, 复合材料CTE减小。TGA分析表明, 填充C-Al纳米粉体的复合材料热稳定性高于未填充硅橡胶。Abstract: With methyl vinyl silicone as the base rubber, filled with carbon coated aluminum(C-Al) nanoparticles, the heat dissipation composites were prepared by using the method of mechanical blending. The SEM was employed to analyze the dispersion of C-Al nanoparticles disperse in silicone rubber which showed that the nanoparticles uniform distribution in silicone rubber. The effect of C-Al nanoparticles on thermal conductivity and coefficient of thermal expansion (CTE) of the silicone rubber were investigated, and it was found that thermal conductivity of the composite increases with increasing the C-Al nanoparticles content, the thermal conductivity begins to decrease when the C-Al volume fraction reaches 50%. The optimum filling amount of C-Al nanoparticles is 50%. The CTE decreases with the loading increasing. TGA shows that the addition of C-Al nanoparticles increases the thermal stability of the silicone rubber.
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