| QIAO Shi-jie,LIU Xiu-bo,ZHAI Yong-jie,XU Jiang-ning,GAO Wei-qiang,YAO Zhi-yuan.Laser Cladding α-Ti/TiC+(Ti,W)C1—x/Ti2SC+TiS Self-lubricating Wear-resistant Composite Coating on TA2 Alloy[J],46(5):52-57 |
| Laser Cladding α-Ti/TiC+(Ti,W)C1—x/Ti2SC+TiS Self-lubricating Wear-resistant Composite Coating on TA2 Alloy |
| Received:November 21, 2016 Revised:May 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.05.010 |
| KeyWord:TA2 alloy laser cladding microhardness wear resistance and antifriction composite coating WS2 |
| Author | Institution |
| QIAO Shi-jie |
School of Mechanical and Electric Engineering, Soochow University, Suzhou , China |
| LIU Xiu-bo |
1.School of Mechanical and Electric Engineering, Soochow University, Suzhou , China; 2. State Key Laboratory of Tribology, Tsinghua University, Beijing , China |
| ZHAI Yong-jie |
School of Mechanical and Electric Engineering, Soochow University, Suzhou , China |
| XU Jiang-ning |
School of Mechanical and Electric Engineering, Soochow University, Suzhou , China |
| GAO Wei-qiang |
School of Mechanical and Electric Engineering, Soochow University, Suzhou , China |
| YAO Zhi-yuan |
School of Mechanical and Electric Engineering, Soochow University, Suzhou , China |
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| Abstract: |
| The work aims to improve wear resistance and friction-reducing property of TA2 alloy and study the effects of adding WS2 on laser clad Ti/TiC composite coating. With Ti+TiC and Ti+TiC+WS2 composite powders as preset materials, two different composite coatings were fabricated on TA2 titanium alloy by laser cladding. Phase composition, microstructure, microhardness and tribological property of the coatings containing WS2 or not were investigated with X-ray diffractometer (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), hardness tester and friction-abrasion testing machine systematically. A composite coating consisting of α-Ti and TiC can be made from the Ti+TiC composite powder, microhardness of the laser clad Ti+TiC composite coating was 1162HV0.5. With the addition of WS2, new reinforced (Ti,W)C1x , self-lubricating Ti2SC and few CrS were produced in the coating. Microhardness of the laser clad Ti+TiC+WS2 composite coating was 1052.3HV0.5 and was about 5 times that of TA2 substrate (180HV0.5). Wear rate of the laser clad composite coating increased from 5.38×105 mm3/(N•m) to 15.98×105 mm3/(N•m) with the addition of WS2, wear resistance of the coating decreased and was still far below that of the substrate (66.63×105 mm3/(N•m)), and friction coefficient of the laser clad composite coating decreased form 0.49 to 0.34. Wear surface of Si3N4 counter-ball was smooth and free from obvious plastic deformation. Its wear mechanism was plastic deformation and adhesive wear. With the addition of WS2, composite coating still exhibits excellent wear resistance compared with the substrate. Meanwhile, due to lubrication effects of the self-lubricating Ti2SC and TiS, the laser clad Ti+TiC+WS2 composite coating presents excellent wear resistance and friction-reducing property. |
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