目的 在铝合金表面制备含氟疏水涂层，改善其综合性能。方法 以Al2O3∶PFA质量比为4∶1、3∶1的混合粉末为热喷涂粉末，采用大气等离子喷涂（APS）技术，调整工艺参数，于铝基体上制备不同的PFA/Al2O3复合疏水涂层，对涂层的相组成、显微结构、结合强度、显微硬度及疏水性能等进行了评价。根据两种粒子在等离子焰流当中的特征及沉积状态，讨论并分析其对疏水性能的影响。结果 涂层的相组成均以γ-Al2O3为主，其中还含有少量α-Al2O3微晶及非晶。涂层表面都有一定的疏水性，其静态水接触角均达到了100°以上，结合强度达到23 MPa以上，显微硬度最高能达到760 HV0.3。结论 两种混合粉末制得的涂层相比，Al2O3∶PFA质量比为3∶1的混合粉末制备的涂层的疏水性有明显提升，说明表面F元素的含量是影响疏水性的重要因素，但其结合强度、显微硬度有所下降。两种粉末粒子经焰流加热后以熔融或半熔融的状态于基体上沉积，形成了团聚扁平状的复合结构，同时，在扁平状结构的表面与四周也存在着未熔或半熔融的椭球形粒子。

The work aims to prepare fluorine-containing hydrophobic coatings and improve overall performance of the coatings. With mixed powder with Al2O3∶PFA mass ratio of 4∶1 and 3∶1 as thermal spraying powder, PFA/Al2O3 composite hydrophobic coatings were prepared on aluminum substrate by adopting atmosphere plasma spraying (APS). Phase composition, microstructure, bonding strength, microhardness, hydrophobic properties, etc. of the coatings were evaluated, respectively. Technological parameters were adjusted to prepare different coatings, and structure and performance of the coatings were compared. Based on characteristics and deposition states of the two kinds of particles in plasma flame flow, the effects on the hydrophobic properties were discussed and analyzed. The coatings were mainly composed of γ-Al2O3, there was a small fraction of α-Al2O3 microcrystals or amorphous crystals in the coatings as well. Surfaces of different coatings exhibited certain hydrophobicity, static water contact angle of the surfaces reached over 100°, bonding strength reached over 23 MPa, and microhardness could be up to 760 HV0.3. Hydrophobicity of the coatings made from mixed powder with mass ratio (Al2O3∶PFA) of 3∶1 is improved significantly, indicating that the content of F element on the surface is an important factor affecting hydrophobicity. However, both bonding strength and microhardness of the coatings decline. The two kinds of powder particles are heated by flame flow and then deposited on substrate in molten or semi-molten state, forming a aggregated tabular composite structure. At the same time, some unmelted or semi-molten ellipsoid particles are detected on the surface and periphery of tabular structure.