Formation mechanism of the lubrication film on the plasma sprayed NiCoCrAlY-Cr2O3-AgMo coating at high temperatures
Formation mechanism of the lubrication film on the plasma sprayed NiCoCrAlY-Cr2O3-AgMo coating at high temperatures
复制标题
等离子喷涂NiCoCrAlY-Cr2O3-AgMo涂层高温润滑膜形成机理
DOI：
10.1016/j.surfcoat.2017.03.065
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发表时间：
2017
影响因子：
5.4
通讯作者：
Zhang Weigang
中科院分区：
文献类型：
--
作者：
Zhang Tiantian;Lan Hao;Huang Chuanbing;Du Lingzhong;Zhang Weigang
采用大气等离子喷涂技术制备了NiCoCrAlY-Cr2 O3-AgMo自润滑复合涂层。采用X射线衍射仪（XRD）、扫描电镜（SEM）和热重分析仪（TGA）对涂层的物相组成、显微结构和热行为进行了表征。在500 °C下以不同的法向载荷和滑动速度对该涂层进行摩擦学试验。结果表明，由于Ag 2 MoO 4的形成，含AgMo的复合涂层在10 N法向载荷下具有约0.3的较低摩擦系数。而在500 °C的临界温度下，在较低的法向载荷下，Ag 2 MoO 4不能形成。对涂层长期磨损行为的进一步研究表明，含AgMo复合涂层在高温下优异的减摩耐磨性能归因于其上表面铺展的液态Ag 2 MoO 4膜和下表面致密的氧化物保护层。
A self-lubricating NiCoCrAlY-Cr2O3-AgMo composite coating was deposited by atmospheric plasma spray technology. Phase composition, microstructure and thermal behavior of this coating were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM) and Thermogravimetric Analysis (TGA) respectively. Tribological tests of this coating were conducted at 500 °C with different normal loads and sliding velocities. The results showed that the AgMo-containing composite coating exhibited lower friction coefficients around 0.3 at 10 N normal loads due to the formation of Ag2MoO4. However, Ag2MoO4could not be formed under lower normal load at the critical temperature of 500 °C. Further investigation on the long-term wear behaviors of the coating revealed that the excellent friction reduction and wear resistance performance of the AgMo-containing composite coating at elevated temperatures could be ascribed to a liquid Ag2MoO4film spreading on the upper surface and a dense oxide protective layer underneath.