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| Tribological Properties of TiN Coated M50 Steel for High Temperature Bearing Against Silver Coatings |
| GE Quanjiang1, ZHANG Xinghong2, MA Xinxin3, CHEN Xionggang3, TANG guangze3 |
( 1. Military Delegate Office of PLA Residing Harbin Bearing Group Corporation, Harbin 150036, China;
2. AECC Harbin Bearing Group Corporation, Harbin 150025, China;
3. School of Material Science & Engineering, Harbin Institute of Technology, Harbin 150001, China) |
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Abstract This work investigated the tribological properties of M50 steel and TiN coated M50 steel against silver coatings, based on the abnormal wear existing in aerospace engine bearing. The effect of relative sliding speed, contact stress as well as the interaction between the two parameters on friction coefficient with time were analyz. SEM and EDS were used to observe the surface morphology and the compositions of the worn traces. The results show that, friction coefficient increases with sliding time, and exists an abrupt change time. With lower sliding speed and lower contact stress, the friction coefficient keeps on 0.15-0.25. However, with higher sliding speed and higher contract stress, the friction coefficient rises quickly and reaches about 0.5. Within the range of parameters in this test, the change time has an approximate linear relationship with PV value, which is the product of contact stress P and sliding speed V . Sliding with high speed and high contact stress, the scratch will occur on the surface of M50 steel by the large hard particles. TiN coating can obviously postpone the time of the high friction coefficient, and has the advantage to prevent the worn of M50 steel due to impeding the peel off of the large carbides
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2017, 
