Surface Modification by HVOF Coating of Micron-sized WC-metal Powder and Laser-heating of the Coating
μWC-metal powder (powder) was coated onto the surface of Inconel 718 (IN718) using HVOF spraying for the improvement of surface properties. The coating was heat-treated by CO2(g) laser for further improvement of the properties. Optimal coating process was obtained from surface properties of 9 coatings prepared by Taguchi program. Surface property improvement by HVOF coating and laser-heating were investigated. The surface hardness of IN718 was increased by coating from 399 Hv to 1260±30 Hv, and further increased to 1860±100 Hv by laser-heating. Porosity of the coating was decreased by laser-heating from 2.2±0.3％ to 0.4±0.1％. The friction coefficient of the surface was decreased by the coating from 0.48±0.06 to 0.33±0.02 at room temperature. Friction coefficients of IN718 and the coating were decreased with increasing sliding surface temperatures from 25℃ to 450℃. According to reciprocating sliding wear tests, wear depth and trace of the coating were smaller than IN718 at both 25℃ and 450℃. The coating had better wear resistance compared to IN718, creating smaller wear traces. At 450℃, wear depth of coating was much smaller than IN718: 50-μm-deep groove compared to 75 μm for IN718.
HVOF spray coating Powder Laser heating Wear Hardness
T.Y. Cho J.H. Yoon S.K. Hur H.G. Chun Shi-hong Zhang
RTI 04-01-03, Institute of Industrial Technology, Changwon National University, Sarimdong 9,Uichang School of Materials Science and Engineering, University of Ulsan, Ulsan, 680-741,Republic of Korea School of Materials Science and Engineering, Anhui University of Technology, Maanshan, Anhui, 243002
国际会议
11th IUMRS International Conference in Asia(第十一届国际材联亚洲材料大会 IUMRS-ICA 2010)
青岛
英文
654-660
2010-09-25（万方平台首次上网日期，不代表论文的发表时间）