等离子喷涂微米和纳米Al_2O_3-13wt%TiO_2涂层的防护性能  

Protective performance of coatings prepared by plasma spraying using the powder of both micro and nano Al_2O_3-13 wt%TiO_2

作　　者：邓春明[1] 张小水 毛杰[1] 张吉阜[1] 刘敏[1] 邓畅光[1] 

机构地区：[1]广东省工业技术研究院(广州有色金属研究院),广东广州510650 [2]中航工业南方航空工业(集团)有限公司,湖南株洲412002

出　　处：《材料研究与应用》2012年第4期236-239,275,共5页Materials Research and Application

基　　金：科技部国际科技合作项目(No.2011DFB50030);广东省产学研项目(2010A090200017)

摘　　要：以微米和纳米Al2O3-13wt%TiO2为粉末材料,采用大气等离子喷涂在Q235钢基体表面制备了Al2O3-13wt%TiO2涂层,对涂层的显微结构、相组成和显微硬度等基本性能进行了表征,并对两种涂层的耐SiC砂粒磨损和耐电化学腐蚀防护性能进行了对比研究.结果表明,与微米粉末相比,纳米粉末作为热喷涂材料需要更高的喷涂功率才能获得致密的纳米和微米复合涂层;纳米粉末制备的涂层的显微硬度、耐砂粒磨损和电化学腐蚀性能均明显优于微米粉末制备的涂层,表明纳米粉末制备的涂层具有更优良的防护性能.Al2O3-13wt%TiO2 coatings were deposited on Q235 steel by air plasma spraying （APS） using both micro and nano Al2O3-13wt%TiO2 powder as feedstock. The mierostrueture, phase compositions and micro-hardness for as-sprayed coatings were examined. The protective properties of both micro and nano Al2O3-13wt%TiO2 coatings were investigated and compared including resistance to sand abrasion and elec- trochemical corrosion. The results showed that relatively denser coating with a mixture of micro and nano- structure by nano Al2O3-13wt%TiO2 powder was fabricated by far higher plasma power than that applied in coating prepared by micro Al2O3-13wt%TiO2 powder. The as sprayed nano Al2O3-13wt%TiO2 coating exhibited better resistance to sand abrasion and electrochemical corrosion, indicating that nanostructured Al2O3-13wt%TiO2 coating showed better protective performances.

关 键 词：等离子喷涂 纳米Al2O3-13wt%TiO2涂层 防护性能 

分 类 号：TG174.442[金属学及工艺—金属表面处理]