新型陶瓷基复合超疏水涂层的制备及其性能

Preparation and Properties of New Ceramic Composite Superhydrophobic Coatings

为了研究开发新型超疏水涂层的制备方法,改善涂层的结构与性能,以Al_2O_3-40%TiO_2(AT40)、PFA(全氟烷氧基乙烯基醚共聚物)粉末为原始材料,采用大气等离子喷涂(APS)技术,并调整电流、氩气流量等喷涂参数,在铝合金基体表面制备了两种不同的AT40/PFA复合超疏水涂层。利用相对应的测试仪器及分析手段对喷涂态涂层的相组成、显微结构、摩擦系数及基本性能等进行了表征分析。结果表明,两种涂层的相组成均为C_(20)F_(42)、Al_2TiO_5及少量的γ-Al_2O_3、α-Al_2O_3相;涂层表面均为圆形和椭圆形的粒状突起结构,其中突起结构的表面均存在类似荷叶表面结构的二元微纳米乳突结构,其表面粗糙度为9.3μm和12.41μm;所得涂层具有良好的综合性能,与水的静态接触角均达到了150°以上,滚动角为4～5°;在其他参数不变的情况下,随着电流的增大及氩气流量的减小,涂层中的陶瓷相含量增加,涂层的粗糙度、摩擦系数、显微硬度及结合强度均增大。

In order to develop a novel method for preparing superhydrophobic coatings and improve the structure and properties of them,using Al 2O 3-40%TiO 2(AT40)and PFA(polyfluoroalkoxy)powders as raw materials.Two different PFA/AT40 composite superhydrophobic coatings were prepared on the aluminum alloy substrate by atmospheric plasma spraying(APS)under diffe-rent current and argon flow rate.The phase composition,microstructure,friction coefficient and basic properties of them were cha-racterized.The results showed that the phase compositions are C 20 F 42,Al 2TiO 5 and a small amount ofγ-Al 2O 3,α-Al 2O 3 phase.The surface structure is composed of circular and oval granular structure,and micro-nano mastoid structure was found,which similar to the lotus leaf.The roughness is 9.3μm and 12.41μm.Both of them show comprehensive performance,and the static contact angle with water is above 150°,the rolling angle is 4-5°.Besides,the results indicated that current and argon are impact on the perfor-mance of coatings.In the case of other parameters unchanged,with the increase of current and the decrease of argon flow rate,the content of ceramic phase in the coating increases,it leads to roughness,friction coefficient,micro-hardness and adhesive strength increase.