采用激光熔覆技术在TC4钛合金表面制备以反应合成TiB2和TiC颗粒为增强相的Ni基复合涂层,利用УТИТВ-100型销-盘摩擦磨损试验机研究了激光熔覆层在真空（10-5Pa）中的干滑动摩擦磨损性能,利用光学显微镜和扫描电子显微镜观察了摩擦偶件的磨损表面形貌,讨论了激光熔覆层的磨损机制。结果表明,激光熔覆层的摩擦系数在0.25-0.5之间,明显低于TC4合金的摩擦系数（0.45-0.8）,磨损体积约为TC4合金的40%。随法向载荷和滑动速度的增加,激光熔覆层的磨损体积增加,激光熔覆层的磨损机制主要为粘着磨损和粘附转移物引起的磨粒磨损。
Ni based composite layer reinforced by in situ synthesized TiB2 and TiC on Ti-6Al-4V alloy substrate was prepared by laser cladding.The friction and wear properties in vacuum（10-5 Pa） of the laser clad layer were investigated on a УТИ ТВ-100 wear tester.The worn surfaces of wear couple were observed by scanning electron microscope（SEM） and optical microscope（OM）,and the wear mechanisms were discussed.The results show that the friction coefficient of the laser clad layer is 0.25-0.5,obviously lower than that of Ti-6Al-4V alloy,which is 0.45-0.8,and the worn volume of the laser clad layer is 40% as that of Ti-6Al-4V alloy.The worn volume increases with increasing of sliding velocity and normal load.The wear mechanism of the laser clad layer in vacuum is adhesion wear and abrasion wear due to adhesive material transferring.
参考文献
| [1] | Molian P A;Hualun L .Laser cladding of Ti-6AI-4V with BN for improved wear performance[J].Wear,1989,130:337-352. |
| [2] | Meng QW;Geng L;Zhang BY .Laser cladding of Ni-base composite coatings onto Ti-6Al-4V substrates with pre-placed B4C+NiCrBSi powders[J].Surface & Coatings Technology,2006(16/17):4923-4928. |
| [3] | 刘荣祥,郭立新,雷廷权.激光重熔NiCrBSi+TiN复合涂层及界面组织[J].中国激光,2005(02):292-296. |
| [4] | Liu XB;Wang HM .Modification of tribology and high-temperature behavior of Ti-48Al-2Cr-2Nb intermetallic alloy by laser cladding[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2006(16):5735-5744. |
| [5] | Yang Shengqun;Meng Qingwu;Geng Lin et al.Ni-TiC coating deposited on Ti-6AI-4V substrate by thermal spraying and laser remehing of Ni-clad graphite powder[J].Materials Letters,2007,61(11-12):2356-2358. |
| [6] | CAI Lifang,ZHANG Yongzhong,SHI Likai.Microstructure and formation mechanism of titanium matrix composites coating on Ti-6Al-4V by laser cladding[J].稀有金属(英文版),2007(04):342-346. |
| [7] | Galvan D;Ocelik V;Pei Y et al.Microstructure and properties of TiB/Ti-6AI-4V coatings produced with laser treatments[J].Journal of Materials E ngineering and Performance,2004,13(04):406-412. |
| [8] | H.C. Man;S. Zhang;F.T. Cheng .MICROSTRUCTURE AND FORMATION MECHANISM OF IN SITU SYNTHESIZED TiC/Ti SURFACE MMC ON Ti-6Al-4V BY LASER CLADDING[J].Scripta materialia,2001(12):2801-2807. |
| [9] | 张松,张春华,吴维(山文),王茂才,刘常升,李诗卓,李曙.TiC/Ti复合材料激光熔覆层的冲击磨粒磨损性能[J].金属学报,2002(10):1100-1104. |
| [10] | Candel, J.J.;Amigó, V.;Ramos, J.A.;Busquets, D. .Sliding wear resistance of TiC_p reinforced titanium composite coating produced by laser cladding[J].Surface & Coatings Technology,2010(20):3161-3166. |
| [11] | Sun RL.;Mao JF.;Yang DZ. .Microstructural characterization of NiCr1BSiC laser clad layer on titanium alloy substrate[J].Surface & Coatings Technology,2002(2/3):199-204. |
| [12] | 孙荣禄,杨贤金.激光熔覆原位合成TiC-TiB2/Ni基金属陶瓷涂层的组织和摩擦磨损性能[J].硅酸盐学报,2003(12):1221-1224. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%