摘要
利用高速电弧喷涂和含有微米TiB2和纳米A l2O3陶瓷粉末的粉芯丝材在碳钢基体上制备了六组陶瓷颗粒弥散增强的Fe-TiB2复合涂层,研究微纳米陶瓷粉末对电弧喷涂Fe-TiB2复合涂层的形成和性能的影响。采用光学显微镜、WYKONT1100三维表面形貌仪对比分析了扁平粒子形貌和厚度;用SEM,EDAX及XRD分析涂层的形貌和相组成,测试了涂层的显微硬度和耐磨粒磨损性能,并用激光共聚焦显微镜观察磨损后的涂层形貌。结果表明,随着粉芯丝材中微纳米陶瓷粉末含量的增加,扁平粒子的形貌从飞溅严重的散点状逐渐转变成少量飞溅的盘状,涂层的孔隙率随之下降。对比6种涂层的组织及性能,发现当粉芯丝材中的TiB2粉末尺寸<2μm时,Fe-TiB2复合涂层中的陶瓷硬质相分布最为细小、弥散,涂层的耐磨性能最好。
The effect of nano and micron powders in cored wires on formation and properties of Fe-TiB2 composite coatings made by high velocity arc spraying （HVAS） were investigated. Six cored wires filled with different average ceramic particle sizes （20 - 40 μm, 2 μm, and 420 μm） and fine powder contents （0,8,16,20,24,32wt. % ） were prepared. The flattening behavior of sprayed particles was characterized and compared by using OM and 3D surface profiler. The microstructure of the coatings and phase compositions were characterized by means of SEM, EDAX and XRD. Microhardness and wear resistance were evaluated and wear scratch was observed by laser confocal scan microscopy. The results show that, with increasing the percentage of fine ceramic powders, the shape of the flat particles transfers from a distorted heavy splash to a disk-like shape, with little splash, and the coatings porosity decreases. When TiB2 powder size is less than 2 μm, Fe-TiB2 composite coatings reveal dispersion of fine ceramic particles and exhibit the best wear resistance.
出处
《金属热处理》
EI
CAS
CSCD
北大核心
2007年第9期63-67,共5页
Heat Treatment of Metals
基金
北京市自然科学基金(2062005)
北京市教委科技发展项目(KM200610005026)
关键词
微纳米陶瓷粉末
高速电弧喷涂
金属-陶瓷复合涂层
扁平化
显微组织
耐磨性能
nano and micron ceramic powders
high velocity arc spraying（HVAS）
metal-ceramic composite coatings
flattening
microstructure
wear resistance
