Study on Wear Resistance of Ni-based Self-Fluxing Alloy Sprayed by HVOF

• Main Authors: Te-Yi Huang, 黃德宜
• Other Authors: 蘇程裕
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/857mzc

碩士 === 國立臺北科技大學 === 機電整合研究所 === 96 === This study focuses on the effects of the reflowing process on the physical properties、hardness analysis and wear test by four Ni-based self-fluxing alloy powders with different particle size mixed WC-Co powder by different weight ratio under reflowing temperature 950°C、1000°C and 1050°C by nitrogen in atmospheric pressure after thermal spray. The results show that the dense coatings can be prepared and also exhibit good hardness and wear performance at reflowing temperature of 950℃. On the phase change, chromium increases the hardness of the coatings by the formation of hard phase with carbon and boron, nickel react with boron into a hard phase and the others change into Ni-solution. According to the elevated temperature, the hardness is decreased but the porosity is increasing because of the grain growth. On the wear resistance, each coating has worse hardness and better wears resistance, especially the coating adding WC-Co. The major wear mechanisms are based on abrasive wear、adhesive wear and surface fatigue. The TSM2002 coating after 950°C reflowing has the hardness which his more than 700Hv and exhibits the porosity under 1% which is the best coating with wearability among these four coatings.