氧气流量对超音速火焰喷涂TiB_2-40Co涂层组织和性能研究  

Influence of oxygen content on microstrcture and performance of high velocity oxygen fuel sprayed TiB_2-40Co coatings

作　　者：陈枭[1] 纪岗昌[1] 王洪涛[1] 王玉伟[1] 白小波[1] 

机构地区：[1]九江学院机械与材料工程学院,九江市绿色再制造重点实验室,江西九江332005

出　　处：《材料科学与工艺》2013年第6期136-143,共8页Materials Science and Technology

基　　金：国家自然科学基金项目(50961007;51001056);江西省自然科学基金项目(20114BAB206019);江西省教育厅科技项目(GJJ12622);江西省十二五重点学科"材料加工工程"资助

摘　　要：采用超音速火焰喷涂技术在不同氧气流量条件下制备3种TiB2-40Co涂层,采用扫描电镜、X射线衍射仪研究了涂层的组织和相结构,运用压痕法测定了涂层的显微硬度,通过水淬法测试涂层的抗热震性能,并研究涂层的耐熔融铝硅腐蚀性能.结果表明,3种TiB2-40Co涂层具有叠层状结构,No.1涂层最为致密,其孔隙率仅为0.286%;涂层的主要物相为TiB2和Co;显微硬度值分别为697±60 HV0.3、523±86 HV0.3和648±38 HV0.3;No.1涂层具有最好的抗热震性能;经过120 h熔融铝硅腐蚀后发现,3种涂层均具有良好的抗熔融铝硅腐蚀性能,其中No.1涂层试样耐腐蚀性能最好.Three kinds of TiB2 -40Co coatings were fabricated by high velocity oxygen fuel（HVOF） method under different oxygen flow rate. The microstructure and phase structure were analyzed by scanning electron microscope （SEM） and X- ray diffraction （XRD）. The microhardness was measured by indentation method and the properties of thermal shock resistance and corrosion resistance to molten A1 - 12.07% Si alloy were investigated. The results show that three kinds of coatings have layer structure, the No. 1 coating has much denser microstructure and the lowest porosity（0. 286% ）, the main phase constitution of the coatings are TiB2 and Co. The microhardness of the studied coatings is respectively 697±60 HV0 z,523 ± 86 HV03 and 648 ± 38 HVO3 The No. 1 coating has excellent thermal shock resistance performance. And the coatings have good durability in the molten A1 - 12.07% Si alloy after 120h immersion test, especially No. 1 coating has better corrosion resistance performance.

关 键 词：超音速火焰喷涂 TiB2-40Co涂层 显微组织 腐蚀 

分 类 号：TG178[金属学及工艺—金属表面处理]