Abstract
The Mo/perfluoropolyether composite coating was prepared on the GCr15 steel block substrate by combining electron beam spraying and dip-coating techniques. Thus a Mo coating was first deposited on the steel surface by making use of electron beam spraying. Then a lubricating coating of polar perfluoropolyether (Zdol-2000) was prepared on the Mo coating by making use of the dip-coating technique. The films were characterized by means of water contact angle measurements and X-ray photoelectron spectroscopic analysis. The surface roughness of the coating was determined by atomic force microscopic observation. The friction and wear behavior of the films in sliding against SAE52100 steel was investigated on a unidirectional friction coefficient precision measurement apparatus. The worn surfaces of the composite coating were observed with a scanning electron microscope. Moreover, the effect of heat-treatment on the tribological behavior of the coating was explored as well. It was found that the Mo/PFPE composite coating showed much better friction-reducing and antiwear behaviors than the Mo deposited coating and the PFPE lubricating coating, which was attributed to the interfacial mixing of the Mo layer on the steel substrate and the lubricating action of the PFPE lubricant layer. The heat-treatment of the Mo/PFPE composite coating at 150°C for 30 min led to worsening in the tribological behavior, which was supposed to be related to the heat-treatment induced changes in the structure and surface state of the composite coating.
| Original language | English |
|---|---|
| Pages (from-to) | 468-471 |
| Number of pages | 4 |
| Journal | Mocaxue Xuebao/Tribology |
| Volume | 23 |
| Issue number | 6 |
| State | Published - Nov 2003 |
| Externally published | Yes |
Keywords
- GCr15 steel
- Mo/PEPE composite coating
- Tribological behavior