High-Temperature Solid Lubricant Coating by Plasma Spraying Using Metal-Metal Clad Powders
High-Temperature Solid Lubricant Coating by Plasma Spraying Using Metal-Metal Clad Powders
复制标题
金属-金属复合粉末等离子喷涂高温固体润滑涂层
DOI：
10.1007/s11666-017-0591-0
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发表时间：
2017
影响因子：
3.1
通讯作者：
Zhang Weigang
中科院分区：
文献类型：
--
作者：
Zhang Tiantian;Lan Hao;Yu Shouquan;Huang Chuanbing;Du Lingzhong;Zhang Weigang
以复合粉末为原料，采用常压等离子喷涂技术制备了NiCr/Ag-Mo复合涂层。利用球盘式高温摩擦磨损试验机对其变温摩擦学性能进行了评价。结果表明，与镍铬相比，镍铬/银-钼复合涂层具有更好的润滑效果和更高的耐磨性，尤其是在600℃以上。在800℃时，镍铬/银-钼复合涂层的摩擦因数最低，约为0.2，相应的磨损率为2.5h×10−5mm~3/Nm。NiCr/Ag-Mo复合涂层的表征表明，在400℃以下，Ag被涂抹并扩散到磨损表面，降低了摩擦磨损。在500℃以上，摩擦氧化生成的Ag2MoO4润滑膜显著提高了涂层的润滑效果和耐磨性。
NiCr/Ag-Mo composite coating was fabricated by atmospheric plasma spray technology using clad powders as the feedstock. Its tribological properties at variable temperature were evaluated using a ball-on-disk high-temperature tribometer in air. The results showed that compared with NiCr, the NiCr/Ag-Mo composite coating exhibited better lubrication effect and higher wear resistance at all test temperatures, especially above 600 °C. At 800 °C, NiCr/Ag-Mo composite coating showed the lowest friction coefficient of about 0.2 and its corresponding wear rate reached 2.5 × 10−5mm3/Nm. Characterizations of NiCr/Ag-Mo composite coating revealed that at temperatures below 400 °C, Ag was smeared and spread onto the wear surface, reducing the friction and wear. At temperature above 500 °C, the Ag2MoO4lubrication film formed by tribo-oxidation significantly improved the coating’s lubrication effect and wear resistance.