In Situ Analysis of the Tribochemical Reaction of CNx by FTIR
In Situ Analysis of the Tribochemical Reaction of CNx by FTIR
复制标题
DOI：
10.2474/trol.3.100
复制
发表时间：
2008-04
期刊：
影响因子：
1
通讯作者：
S. Kanda;T. Tokoroyama;N. Umehara;Y. Fuwa
中科院分区：
文献类型：
--
作者：
S. Kanda;T. Tokoroyama;N. Umehara;Y. Fuwa
碳氮（CNx）涂层在大气压氮气中与氮化硅（Si 3 N4）球摩擦时表现出超低摩擦系数。这种超低摩擦现象发生在多次滑动循环之后，在所谓的磨合期，由于氮原子从最顶部的CNx涂层表面脱附;其表面变成石墨状层，并且在对置材料表面上形成转移层。然而，当在最上面的CNx表面上观察到包括官能团在内的详细摩擦现象时，应同时进行摩擦测试和表面分析。据推测，当样品从合成室中取出时，几个官能团被吸附在碳系统涂层的最顶表面上。在本研究中，我们在FTIR分析室中构建了一个摩擦测试装置，以进行摩擦测试和表面分析，而无需将摩擦测试室从分析室中取出。1500次循环的分析结果表明，-OH或-NH官能团随着滑动循环次数的增加而逐渐增加。但随着摩擦系数的降低，该基团突然减少。最后，当CNx涂层表现出超低摩擦现象时，未检测到这类官能团。
Carbon Nitride (CNx) coating was reported to show a superlow friction coefficient when it slid against a Si3N4 ball in nitrogen gas at atmospheric pressure. This superlow friction phenomenon occurred after a number of sliding cycles, in the so-called running-in period, due to the nitrogen atom desorption from the topmost CNx coating surface; its the surface became a graphite-like layer, and a transfer layer was formed on the counter material surface. However, a friction test and surface analysis should be conducted simultaneously, when detailed frictional phenomena including functional groups are observed on the topmost CNx surface. It was supposed that several functional groups were adsorbed on the topmost surface of the carbon system coating when the specimen was withdrawn from the synthesis chamber. In this study, we constructed a friction test apparatus in a FTIR analytic chamber to conduct friction tests and surface analysis without taking the friction test chamber out of the analytical chamber. The analysis results of 1500 cycles each indicated that the -OH or -NH functional group gradually increased with the number of sliding cycles. However, the group decreased suddenly as the friction coefficient decreased. Finally, these kinds of functional groups were not detected when the CNx coating showed superlow friction phenomena.