Preparation of super hydrophobic titanium alloy surface and its tribological performance

Transcript

1 Volume 25 Number 9 The Chinese Journal of Nonferrous Metals Sep (2015) ( ) Ti6Al4V 100 μm SiO 2 (UMT) LEXT OLS4000 3D SiO 2 Ti6Al4V 32.3% 53.8% Ti6Al4V TG146.2 A Preparation of super hydrophobic titanium alloy surface and its tribological performance LIAN Feng, REN Hong-mei, GUAN Shan-kun, ZHANG Hui-chen (College of Transportation Equipment and Ocean Engineering, Dalian Maritime University, Dalian , China) Abstract: In order to study the impacts of the surface pattern and wettability on tribological performance, the laser processing was used to prepare grid and dot micro-structure with spacing of 100 μm on Ti6Al4V alloy surface. The SiO 2 nano particles were coated on the micro-structures to build micro-nano structures. The contact angles and roll angles were measured by contact angle measurement. The tribological performance was evaluated by universal micro-tribometer(umt). The micrograph and wear tracks were investigated by LEXT OLS4000 3D laser scanning confocal microscopy. The results show that the super hydrophobic Ti6Al4V surfaces with the micro-nano structure can be prepared by coating the SiO 2 nano particles on the micro-structures. The grid surface is more difficult to be wet than dot surface. The harder the surface is wet, the lower the wear rate of sample is. The wear rates of super hydrophobic surface with dot and grid decrease by 32.3% and 53.8%, respectively, while the fluctuation and value of friction coefficient curve both decrease. The super hydrophobic Ti6Al4V surfaces with the micro-nano structure significantly improve the tribological properties of titanium alloy. Key words: titanium alloy; hydrophobic; super hydrophobic; tribological performance [1] ( ) ( ) ( ) lianfeng1357@163.com

2 [2] [3] [4] 45 [5] 26.3% [6] 4 [7 8] 150 [9 10] [11] WANG [12] h THIEME [13] MEHDI [14] 156 Ti6Al4V 100 μm SiO 2 Ti6Al4V mm Ti6Al4V 20 mm 20 mm, HGL LSY50F 100 μm 1064 nm 50 W 3.14 khz 13 A/m 2 1 min N 2 ( 0.5 ml 1H 1H 2H 2H- (97%) 50 ml ) h SiO 2 ( 50 ml 2.5 ml 0.5 ml 0.1 ml (2,4,6-95%)) 30 min mol/l SiO 2 ( 0.25 g SiO 2 50 ml 0.25 ml α- 97%) 3 h 5 h h Easy Drop, 2 μl 5 μl (UMT) 40%~45% 5 N 3 mm/s d4 mm Si 3 N 4 5 mm 2 h LEXT OLS4000 3D Phillips XL30 SiO SiO 2

3 Fig. 1 3D topographies of different specimens: (a) Smooth; (b) Grid; (c) Dot; (d) Smooth with SiO 2 ; (e) Grid with SiO 2 ; (f) Dot with SiO SiO 2 SEM 2 Ti6Al4V SiO 2 3(a) 3(a) 150 Wenzel [15] ( 1),, 2 SiO 2 SEM Fig. 2 SEM image of SiO 2 nanoparticle coating

4 SiO ( 3(b)) ( 2) Ti6Al4V Cassie [15] SiO SiO 2 Ti6Al4V SiO 2 4 Fig. 4 Grinding cracks of different smooth surfaces: (a) Vacancy; (b) Low energy; (c) Coated with SiO 2 3 Fig. 3 Contact angle (a) and rolling angle (b) of different surfaces SiO SiO Fig. 5 Grinding cracks of grid surfaces of different samples: (a) Vacancy; (b) Low energy; (c) Coated with SiO 2

5 SiO 2 SiO 2 8 SiO 2 Ti6Al4V 32.3% 53.8% 6 Fig. 6 Grinding cracks of dot surfaces of different samples: (a) 7 Fig. 7 Grinding crack cross-section of different samples surfaces: (a) Smooth; (b) Grid; (c) Dot Vacancy; (b) Low energy; (c) Coated with SiO 2 6 SiO 2 K (1) [16] ΔV K = (1) F L z K mm 3 N 1 m 1 ΔV mm 3 F z N L (18 m) ΔV S l (5 mm) ΔV=Sl 7, OLS4000 LEXT ΔV=Sl V a V a 100 μm OLS4000 LEXT 8 8 Fig. 8 Specific wear rates of different samples ( 4(a)) Si 3 N 4 [10] SiO 2

6 SiO 2 SiO 2 SiO s ( Ti6A14V SiO 2 SiO HV 600 HV 500 HV) 2000 s SiO 2 SiO 2 9(b) (c) (a) Si 3 N 4 5 N SiO 2 SiO 2 ( 9 μm) 6500 s μm 2000~6500 s Fig. 9 Friction coefficients of different samples: (a) Smooth; (b) Grid; (c) Dot 10 Fig. 10 Friction coefficient extremums of different samples surfaces

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