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Open AccessArticle

Abrasive Wear Resistance of Plasma-Nitrided Ti Enhanced by Ultrasonic Surface Rolling Processing Pre-Treatment

1
School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China
2
Zhengzhou Institute, China University of Geosciences (Beijing), Zhengzhou 451283, China
3
Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences, Zhengzhou 450006, China
4
National Key Lab for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China
5
SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, Southeast University, Nanjing 2100096, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(19), 3260; https://doi.org/10.3390/ma12193260
Received: 21 August 2019 / Revised: 27 September 2019 / Accepted: 1 October 2019 / Published: 6 October 2019
(This article belongs to the Section Manufacturing Processes and Systems)
The objective of the given work was to investigate abrasive wear behaviours of titanium (Ti) treated by ultrasonic surface rolling processing (USRP) pre-treatment and plasma nitriding (PN). Simulated lunar regolith particles (SLRPs) were employed as abrasive materials during characterization of tribological performances. The experimental results showed that SLRPs cause severe abrasive wear on Ti plasma-nitrided at 750 °C via the mechanism of micro-cutting. Due to the formation of a harder and thicker nitriding layer, the abrasive wear resistance of the Ti plasma-nitrided at 850 °C was enhanced, and its wear mechanism was mainly fatigue. USRP pre-treatment was effective at enhancing the abrasive wear resistance of plasma-nitrided Ti, due to the enhancement of the hardness and thickness of the nitride layer. Nevertheless, SLRPs significantly decreased the friction coefficient of Ti treated by USRP pre-treatment and PN, because the rolling of small granular abrasives impeded the adhesion of the worn surface. Furthermore, USRP pre-treatment also caused the formation of a dimpled surface with a large number of micropores which can hold wear debris during tribo-tests, and finally, polishing and rolling the wear debris resulted in a low friction coefficient (about 0.5). View Full-Text
Keywords: titanium; plasma nitriding; surface nano-crystallization; lunar regolith particles; abrasive wear titanium; plasma nitriding; surface nano-crystallization; lunar regolith particles; abrasive wear
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She, D.; Liu, S.; Kang, J.; Yue, W.; Zhu, L.; Wang, C.; Wang, H.; Ma, G.; Zhong, L. Abrasive Wear Resistance of Plasma-Nitrided Ti Enhanced by Ultrasonic Surface Rolling Processing Pre-Treatment. Materials 2019, 12, 3260.

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