Entity

Time filter

Source Type


Xiong X.,China Institute of Technology | Xu X.,Ningbo University of Technology | Bao M.,Ningbo University of Technology | Sun H.,Zhejiang Huijin Teer Coatings Technology Co.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2011

The MoS2/Ti composite coatings were deposited using closed field unbalanced magnetron sputtering ion plating, on substrates of M42 high speed steel. The impacts of the deposition conditions, such as the Ti content, deposition rate, sputtering power, surface roughness, and film thickness, on the mechanical properties, including friction coefficient, surface hardness, and wear resistance, were experimentally studied. The results show that the Ti content significantly affects the mechanical properties of the MoS2/Ti composite coatings. For example, as Ti content increases, the surface hardness of MoS2 coatings increases at a slowly decreased rate. The friction coefficient in the ball-on-disc test with heavier load decreases possibly because of film transfer. Moreover, the sputtering power of Ti target little influences the MoS2 film thickness. Source


Bao M.,Ningbo University of Technology | Xu X.,Ningbo University of Technology | Liang R.,Ningbo University of Technology | Liang R.,China University of Mining and Technology | And 2 more authors.
ASTM Special Technical Publication | Year: 2012

CrMoN and CrWN coatings were deposited using closed field unbalanced magnetron sputter ion plating system. The microstructure, preferred orientation, and morphology of coatings were determined by x-ray diffraction analysis and SEM observation. The influences of additional elements on the microstructure, adhesion, mechanic, and tribological properties have been investigated. XRD Results showed that preferred orientation of CrMoN and CrWN coatings obviously changed compared with that of the pure CrN coating. All of the new hard coatings exhibited excellent adhesion due to the gradient interface layer design. By introducing Mo and W elements into the CrN-based structure, the coating hardness had an obvious improvement in comparison with pure CrN coatings. Results also showed the wear resistance of CrMoN and CrWN coatings increased clearly. The steady-state dry friction coefficients of the new coatings measured against a WC-6% Co ball are about 0.3, which were significantly decreased from 0.5 of pure CrN coaing. It is expected that these advantageous properties can enable these new hard coatings for a wide range of applications such as dry high-speed machining. Copyright © 2011 by ASTM International. Source


Bao M.,Ningbo University of Technology | Liang R.,Ningbo University of Technology | Xu X.,Ningbo University of Technology | Yu L.,Zhejiang Huijin Teer Coatings Technology Co. | Sun H.,Zhejiang Huijin Teer Coatings Technology Co.
65th ABM International Congress, 18th IFHTSE Congress and 1st TMS/ABM International Materials Congress 2010 | Year: 2010

CrMoN and CrWN composite coatings were deposited unsing closed field unbanlanced magnetron sputter ion plating system. The microstructure, preferred orientation and morphology of coatings were determined by X-ray diffraction analysis and SEM observation. Influence of additional elements on the microstructure, adhesion, mechanic and tribological properties have been investigated. XRD Results showed that preferred orientation of CrMoN and CrWN coatings changed obviously as compared with the pure CrN coating. All of the new compostie coatings exhibited excellent adhesion due to the gradient interface layer design. By introducing Mo and W elements into the CrN-based structure, the coating hardness improved in comparision with the pure CrN coatings. Results also showed the wear resistance of CrMoN and CrWN coatings increased clearly. The steady-state dry friction coefficients measured against a WC-6%Co ball for the new compostie coatings are about 0.3, which were significant dropped than that of pure CrN coaing of 0.5. It is expected that these advantageous properties can enable these new compsite coatings for a wide range of applications such as dry high-speed cutting. Source


Du D.,Northwest University, China | Liu D.,Northwest University, China | Ye Z.,Northwest University, China | Zhang X.,Northwest University, China | And 3 more authors.
Applied Surface Science | Year: 2014

To investigate their effect on the fretting wear (FW) and fretting fatigue (FF) resistance of a Ti6Al4V alloy, the diamond-like carbon (DLC) and graphite-like carbon (GLC) films were deposited on a Ti6Al4V alloy substrate using closed field unbalanced magnetron sputtering. The basic film properties, such as surface morphology, micro-structure, micro-hardness, bonding strength, and toughness were investigated by atomic force microscopy, X-ray photoelecton spectroscopy, nano-hardness testing, scratch testing and by a home-made repeated press-press test system, respectively. The FW and FF resistance was studied using home-made devices. The results show that DLC and GLC films can reduce the friction factor while the FW and FF resistance of the titanium alloy were improved significantly. However, the FW and FF resistance of the DLC film on the titanium alloy was better than that of the GLC film. This was attributed to the excellent properties of bonding strength and toughness of the DLC film. Moreover, the effect of bonding strength and toughness is more important than that of friction factor in improving the FW and FF resistance. © 2014 Elsevier B.V. All rights reserved. Source

Discover hidden collaborations