Tribological properties of plasma-sprayed nickel alloy matrix self-lubricating coating at elevated temperatures

• 作者: Wen-Sheng Li Yang Sun Wei Hu Sheng-Yu Zhu Hai-Min Zhai Jun Yang Xiang-Juan Fan Wei-Min Liu
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（7）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 1844-1850
• 页数: 7页
• 语种: 英文

摘要

A nickel alloy matrix high-temperature self-lu-bricating coating(77.5 wt％(Ni-Cr-Mo-Al)-12.5 wt％Ag-10 wt％BaF2/CaF2)was prepared by plasma spraying technique.Results show that the Vickers microhardness of coating is(2.9±0.5)GPa,and the average bonding strength is about(35.6±0.5)MPa.The coating rubbing against Inconel 718 superalloy pin exhibits superior tribo-logical performance with coefficient of friction(COF)of below 0.25 and wear rate of 8.2×10-5-15.2×10-5 mm3·N-1·m-1 at a wide temperature range from 25 to 800℃,and the COF and the wear rate are slightly reduced with temperature increasing.The low COF and wear rate were attributed to the synergistic effects of Ag,BaF2/CaF2,Ag2MoO4 and BaMoO4.