Effects of environmental atmospheres on tribological behaviors of sintered polycrystalline diamond sliding against silicon nitride |
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| Affiliation: | 1. School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China;2. National International Joint Research Center of Deep Geodrilling Equipment, China University of Geosciences (Beijing), Beijing 100083, PR China;1. School of Mechanical and Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China;2. Key Laboratory of Advanced Manufacturing and Measurement and Control Technology for Light Industry in Universities of Shandong, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China;1. School of Mechanical and Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China;2. Key Laboratory of Equipments Manufacturing and Intelligent Measurement and Control, China National Light Industry, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China;1. School of Materials Science and Engineering, Henan University of Technology, Zhengzhou 450001, China;2. China University of Mining and Technology (Beijing), Beijing 100083, China;1. State Key Laboratory of Mechanical Manufacturing Systems Engineering, Xi''an Jiaotong University, Xi''an 710049, China;2. School of Mechatronics Engineering, Nanchang University, Nanchang 330031, China |
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| Abstract: | To explore the effect of various atmosphere the tribological behaviors of the sintered polycrystalline diamond compacts (PDCs), the friction and wear behaviors of PDCs sliding against Si3N4 balls were evaluated by a ball-on-disk tribometer under nitrogen, argon, oxygen and air (10% relative humidity) environments, respectively. The energy dispersive X-ray spectrum (EDS), Raman spectroscopy, scanning electron microscopy (SEM) and atomic force microscope (AFM) were conducted to investigate the microstructure evolution of worn surface. The results demonstrated that the low friction appeared in argon and nitrogen environment. The formations of consecutive carbonaceous transfer films on wear scars contributed to decrease the friction during sliding process. The wear of PDCs and Si3N4 balls were serious in argon and nitrogen environment, but slight in oxygen and air conditions. There is a direct relationship between material removal and running-in period. The passivation effect of dangling bond under oxygen and air conditions can shorten the running in period thus weaken the wear. |
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