Nanoscale mechanochemical wear of phosphate laser glass against a CeO2 particle in humid air
Nanoscale mechanochemical wear of phosphate laser glass against a CeO2 particle in humid air
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潮湿空气中磷酸盐激光玻璃对 CeO2 颗粒的纳米级机械化学磨损
DOI：
10.1016/j.apsusc.2016.09.061
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发表时间：
2017-01
影响因子：
6.7
通讯作者：
Hailong Hu
中科院分区：
文献类型：
--
作者：
Jiaxin Yu;Hongtu He;Yafeng Zhang;Hailong Hu
利用原子力显微镜定量研究了磷酸盐激光玻璃与CeO 2颗粒在湿空气和真空中的摩擦磨损行为，揭示了磷酸盐激光玻璃的机械力化学磨损机理。玻璃/CeO_2摩擦副在空气中的摩擦系数比在真空中的摩擦系数高5-7倍，这是由于摩擦界面上形成了毛细水桥，毛细摩擦对总摩擦系数的贡献高达65- 79%。毛细管水桥进一步诱导了玻璃和CeO 2颗粒表面的严重材料去除，同时提供了局部液态水环境以腐蚀玻璃表面和高剪切力以帮助拉伸Cesingle键O单键P键，加速水与玻璃/CeO 2对之间的反应。然而，在真空中，没有观察到可辨别的磨损现象，但AFM轻敲模式捕获的相位图像表明，在玻璃表面的摩擦区域发生潜在的应变硬化。
Using an atomic force microscope, the friction and wear of phosphate laser glass against a CeO2particle were quantitatively studied both in humid air and in vacuum, to reveal the water molecules induced mechanochemical wear mechanism of phosphate laser glass. The friction coefficient of the glass/CeO2pair in air was found to be 5–7 times higher than that in vacuum due to the formation of a capillary water bridge at the friction interface, with a contribution of the capillary-related friction to the total friction coefficient as high as 65–79%. The capillary water bridge further induced a serious material removal of glass and CeO2particle surfaces, while supplying both a local liquid water environment to corrode the glass surface and a high shearing force to assist the stretching of the Cesingle bondOsingle bondP bond, accelerating the reaction between water and the glass/CeO2pair. In vacuum, however, no discernable wear phenomena were observed, but the phase images captured by AFM tapping mode suggested the occurrence of potential strain hardening in the friction area of the glass surface.
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