Effects of Powder Size in Cored Wire on Arc-Sprayed Metal-Ceramic Coatings
The effect of nano and microstructured powders in cored wires on formation and properties of Fe-TiB2 composite coatings by high velocity arc spraying (HVAS) was investigated. Six cored wires filled with different average ceramic particle sizes 20-40 nm, 2 μm, and 420 μm) and fine powder contents (0, 8, 16, 20, 24, 32wt.％) were sprayed. The flattening behavior of sprayed particles was characterized and compared by using optical microscopy (OM) and 3D Surface Profiler. The microstructure of the coatings and phase compositions were characterized by means of Laser Confocal Scan Microscopy, SEM, EDAX and XRD. Hardness and wear properties were evaluated. The results showed that the splat shape of the cermets has a transitional tendency to change from a distorted heavy splash to a disk with little splash with (i) increasing the percentage of fine ceramic particles and (ii) decreasing coatings porosity. Fe –2 μm 32％ TiB2 coatings reveals a dispersion of fine ceramic particles and less scattering of hardness, which improved the wear resistance and changed the abrasion mode.
J. J. Fang Z. X. Li M. Qian C. L. Ren Y. W. Shi
College of Materials Science and Engineering, Beijing University of Technology, Beijing, China
国际会议
北京
英文
2007-05-14（万方平台首次上网日期，不代表论文的发表时间）