Dr. Pengfei Wang Publish papers on Surface & Coatings TechnologyViews [2882] Delivery time :2014-12-18 12:18:19
Dr. Pengfei Wang has published a paper titled as “Low frictions of self-mated CNx coatings in dry and humid inert gas environments” on Surface & Coatings Technology.
Low frictions of self-mated CNx coatings in dry and humid inert gas environments
Surface & Coatings Technology, 258, 1137 (2014) (PDF-File)
Pengfei Wang , and Koshi Adachi.
The friction behavior of CNx coated Si3N4 disk sliding against CNx coated Si3N4 ball (denoted as CNx/CNx) in dry and humid
inert gas environments (i.e. nitrogen, argon, and helium) is investigated in this study. The sliding contact of self-mated CNx coatings has been realized thanks to the promising two-step ball-on-disk friction test, where the rubbed Si3N4 ball in the running-in stage (step 1) is replaced by a new CNx coated Si3N4 ball in the subsequent stage (step 2). As a result, friction coefficients of less than 0.05 are obtained for self-mated CNx coatings in all three dry inert gas environmentswith relative humidity under 5%RH.Moreover, friction coefficients of less than 0.10 are obtained for the sliding contact of CNx/CNx in inert gas environmentswith relative humidity of larger than 35%RH. Especially, the lowest friction coefficient of 0.020 is achieved in the nitrogen gas environment with relative humidity of 37%RH. Furthermore, the sliding contact of self-mated CNx coatings survives after friction tests in humid nitrogen and argon gas environments. The low frictional performance and low sensitivity of friction to water vapor for the self-mated CNx coatings in inert gas environments are mainly attributed to the formation of a sp2 rich carbon tribo-layer on the mating surface. The pronounced frictional performance of selfmated CNx coatings has made them good candidates for the demanding industrial applications.