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采用水热法在Al2O3颗粒表面包覆ZnO制备Al2O3@ZnO颗粒,并通过控制合成条件在Al2O3颗粒表面制备出了具有不同微观形貌的ZnO包覆层。还探讨了水热合成中生长液的pH值对ZnO的包覆层生长过程以及对ZnO包覆层生长形貌的影响,研究了Al2O3@ZnO颗粒填充环氧树脂对环氧基复合材料导热性能的影响。研究结果表明:随着pH的升高,ZnO包覆层的均匀性和致密性越好,即包覆的效果越好。Al2O3@ZnO颗粒表面ZnO的形态从颗粒状到星状最后到刺球状转变,随之填充Al2O3@ZnO颗粒的环氧基复合材料的热导率也逐渐提高。采用pH=10时所制备的Al2O3@ZnO颗粒填充环氧树脂,其热导率相对于未处理Al2O3填充的环氧树脂提高了10.3%。
Al2O3 was coated on the surface of Al2O3 particles by hydrothermal method to prepare Al2O3 @ ZnO particles. ZnO coatings with different microstructures were prepared on the surface of Al2O3 particles by controlling the synthesis conditions. The effects of pH value of growth solution on the growth of ZnO coating and the growth morphology of ZnO coating were also discussed. The effects of Al2O3 @ ZnO particles on the thermal conductivity of epoxy composites Impact. The results show that with the increase of pH, the uniformity and compactness of ZnO coating is better, that is, the better the coating effect. The morphology of ZnO on the surface of Al2O3 @ ZnO particles changed from granular to star-shaped to spine-shaped, and then the thermal conductivity of epoxy composites filled with Al2O3 @ ZnO particles gradually increased. Epoxy resin filled with Al2O3 @ ZnO particles prepared at pH = 10 increased the thermal conductivity by 10.3% relative to the untreated Al2O3-filled epoxy resin.