2O3復合粉末，通過凍融法和表面修飾法對BN進行了改性處理，改變表面修飾劑類型和摩爾比得到了前驅體和燒結態(tài)BN/Al2O3復合粉末，并利用機械混合法制備了聚合物基BN/Al2O3復合材料，并測試分析了其導熱性能。結果表明，經凍融處理的BN分散性和界面相容性明顯優(yōu)于未經凍融處理的BN。多巴胺對BN的改性效果優(yōu)于聚乙二醇。采用多巴胺作為表面修飾劑且BN與Al(NO3)3的摩爾比為1:1時，能夠得到納米Al2O3均勻包覆的微米BN粉末，即BN/Al2O3微納復合粉末，其聚合物基復合材料的導熱系數可達0.62 W·m-1·K-1，是純聚合物導熱系數的3倍，是采用純微米BN粉末制備的聚合物基復合材料導熱系數的1.5倍。在BN表面附著的Al2O3可以形成層狀熱傳導通道，能夠有效提高聚合物基BN/Al2O3復合材料的熱導率。;Several boron nitride (BN)/aluminum oxide (Al2O3) composite powders were synthesized by liquid-solid phase co-mixture method. BN was modified by the freeze-thaw method and surface modification. The precursor and as-sintered BN/Al2O3 composite powders were obtained by changing the type of surface modification materials and the molar ratios. Additionally, the thermal conductivity of the epoxy resin (EP)-based BN/Al2O3 composite materials prepared by mechanical mixture was measured and analyzed. Results show that the dispersion and interfacial compatibility of BN after freeze-thaw process are obviously better than those without freeze-thaw process. The modification effect of dopamine on BN is better than that of polyethylene glycol. When the dopamine is used as the surface modification material and the molar ratio of BN to Al(NO3)3 is 1:1, BN powder at micro-level with uniform nano-Al2O3 deposition can be obtained, namely the BN/Al2O3 micro/nano-composite powder. The thermal conductivity coefficient of this EP-based BN/Al2O3 composite reaches 0.62 W·m-1·K-1, which is 3 times and 1.5 times higher than that of the pure EP composite and EP-based composite material prepared by pure micro-sized BN powder, respectively. The deposited nano-Al2O3 on BN surface can form multiple thermal conduction paths, thereby improving the thermal conductivity of the EP-based BN/Al2O3 composites."/>
2O3;復合粉末;導熱性能;BN/Al2O3;compositepowder;thermal conductivity property"/>