A comparative study on the tribological behaviors of nitrided and sulfur-nitrided 35CrMo steel lubricated in PAO base oil with MoDTC additive |
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| Affiliation: | 1. School of Materials Science and Engineering, East China JiaoTong University, Nanchang 330013, People''s Republic of China;2. Research Center of Material and Chemical Engineering, School of Material and Chemical Engineering, Tongren University, Tongren 554300, People''s Republic of China;3. Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, People''s Republic of China;4. College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, People''s Republic of China |
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| Abstract: | A nitrided layer on 35CrMo steel was prepared by the ion nitriding process, and then a sulfur-nitrided layer was obtained by low temperature ion sulfuration. The results showed that both the nitrided and sulfur-nitrided surfaces improved the wear resistance efficiently under PAO lubrication, and exhibited the best wear resistance and friction-reducing property under PAO with 0.75% MoDTC lubrication. Compared with the plain and nitrided surfaces, the sulfur-nitrided surface exhibited the best synergistic effect with MoDTC displaying the lowest friction coefficient and wear volume. The mechanism of the best effect was due to MoS2 and FeS formed on the sulfur-nitrided surface. |
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