Improvement of Tribological Behavior of Biomedical Nanostructured Titanium by Magnetron Sputtered SiC Films

2011 ◽  
Vol 189-193 ◽  
pp. 1040-1044
Author(s):  
Ti Feng Zhang ◽  
Xiao Jing Xu ◽  
Zhi Yong Ling ◽  
Wei Pang ◽  
Su Feng Wu ◽  
...  
Keyword(s):  
Normal Load ◽  
High Hardness ◽  
Carbon Films ◽  
Wear Properties ◽  
Nanostructured Titanium ◽  
Silicon Carbon ◽  
Modulus Difference ◽  
Low Modulus ◽  
Film Cracking ◽  
Film Substrate

The nano-indentation and friction/wear properties of a magnetron sputtered SiC (silicon carbon) films on nanostructured titanium (produced by severe plastic deformation) substrate were investigated. The results show that the films exhibited low nano-hardness (10.6 GPa), low Young's modulus (83.3 GPa) and high hardness-to-modulus ratio (0.128). As sliding against Si3N4 (silicon nitride) balls (2 mm in radius) under Kokubo simulation body fluid (SBF) at room temperature, the films displayed superior friction/wear properties at the considerably high normal load of 1000g, with the friction coefficient of about 0.18, the special wear rate on the order of 10−6 mm3 N-1m-1 without film cracking and interface delaminating. The impressive film cracking and interface delaminating resistance is in accordance with the low hardness (high ductility) of the films and the small film-substrate modulus difference that was caused by the low modulus of the films.

Microstructure and Wear-Resistant SiC Film by RF Magnetron Sputtering

2011 ◽  
Vol 687 ◽  
pp. 580-584
Author(s):  
K. Tian ◽  
Xiao Jing Xu ◽  
Zhen Fan ◽  
Xin Ni Hao ◽  
Dan Chen ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Carbon Film ◽  
Titanium Substrate ◽  
Rf Magnetron Sputtering ◽  
Wear Properties ◽  
Wear Resistant ◽  
Silicon Carbon ◽  
Order Of Magnitude ◽  
Film Cracking ◽  
Film Substrate

A wear-resistant SiC (silicon carbon) film on titanium substrate was prepared by magnetron sputtering technology. The film exhibits low nano-hardness of 12.1 GPa and low Young's modulus of 166.2 GPa together with superior friction/wear properties. As sliding against Si3N4 (silicon nitride) ball (2 mm in radius) at room temperature under Kokubo simulation body fluid condition, the film exhibited the friction coefficient of about 0.215 and the special wear rate in the order of magnitude of 10−5 mm3/ Nm even at the load of 500g without film cracking and interface delaminating. The high film-cracking and interface-delaminating resistance is due to the low hardness of the film and the good film/substrate modulus match caused by the low elastic modulus of the film.

Nanoindentation and Friction/Wear Behaviors of a Magnetron Sputtered Cnx/Sic Films on Magnesium Alloy

2011 ◽  
Vol 464 ◽  
pp. 637-641
Author(s):  
J.P. Mo ◽  
Xiao Nong Cheng ◽  
Xiao Jing Xu ◽  
Deng Fu Xia ◽  
Xin Ni Hao
Keyword(s):  
High Hardness ◽  
Wear Properties ◽  
High Adhesion ◽  
Silicon Carbon ◽  
Alloy Az91d ◽  
Order Of Magnitude ◽  
Film Cracking ◽  
Cnx Films ◽  
Sic Film ◽  
Sic Films

The interface adhesion, nano-indentation and friction/wear properties of the CNx films in CNx/SiC (carbon nitride/silicon carbon) double layer films (SiC as interlayer) deposited on Mg alloy (AZ91D) substrate by using magnetron sputtering technique at room temperature were investigated. The results show that the interface between CNx film and SiC film and the interface between SiC film and Mg substrate both showed obvious and gradual element diffusions as well as high adhesion. The CNx films exhibited low nano-hardness (3.85 GPa) and Young's modulus (30.46 GPa) but high hardness-to-modulus ratio (0.126). As sliding against Si3N4 (silicon nitride) ball (4 mm in diameter) using ball-on-disc friction and wear tester under dry sliding condition at 200g load, the CNx films exhibited the friction coefficient of about 0.20 and the special wear rate in the order of magnitude of 10−6 mm3 m−1 N−1 without film cracking and interface delaminating.

Friction and Wear Properties of Magnetron Sputtered DLC/SiC Films on Magnesium Alloy

2009 ◽  
Vol 610-613 ◽  
pp. 853-858 ◽  
Author(s):  
Xiao Jing Xu ◽  
Deng Fu Xia
Keyword(s):  
Friction And Wear ◽  
High Hardness ◽  
High Wear Resistance ◽  
Modulus Ratio ◽  
Wear Properties ◽  
Silicon Carbon ◽  
Alloy Az91d ◽  
The Mean ◽  
Friction And Wear Properties ◽  
Sic Films

The nano-indentation response and the friction/wear properties of DLC/SiC (diamond-like carbon/silicon carbon) double layer thin films deposited on Mg alloy (AZ91D) substrate using magnetron sputtering technique at room temperature were investigated. The results show that the DLC films displayed low nano-hardness (3.05 GPa), low Young's modulus (24.67 GPa) but high hardness-to-modulus ratio (0.124). The films-substrate system exhibited a good friction and wear properties with the mean friction coefficient of about 0.175, the special wear rate in the magnitude order of 10−6 mm3 m−1 N−1 together with little film-cracking and interface-delaminating, when sliding against Si3N4 (silicon nitride) ball using ball-on-disc wear tester under dry frictional condition. The high wear-resistance is in accordance with high ductility of the films, good modulus match in the films-substrate system, and high hardness-to-modulus ratio of the films. The underlying factors are discussed and are believed to be due to the substrate is Mg, a metal with high activity.

Improvement of Tribological Behaviour of Biomedical Nanocrystalline Titanium by Magnetron Sputtered DLC/SiC Double Layer Films

2009 ◽  
Vol 610-613 ◽  
pp. 1026-1033 ◽  
Author(s):  
Xiao Jing Xu ◽  
H. Wang ◽  
Xiao Nong Cheng
Keyword(s):  
Double Layer ◽  
Room Temperature ◽  
High Hardness ◽  
Modulus Ratio ◽  
Wear Properties ◽  
Nano Indentation ◽  
Substrate Adhesion ◽  
Nanocrystalline Titanium ◽  
Film Substrate ◽  
Indentation Response

The nano-indentation response, the film-substrate adhesion behaviors and the friction and wear properties of the DLC/SiC (diamond-like carbon/silicon carbon) double layer thin films (SiC films as interlayer) deposited on nanocrystalline titanium substrate using magnetron sputtering technique at room temperature were investigated. The results show that the DLC films exhibited a low nano-hardness (7.4 GPa) and Young's modulus (62.2 GPa) but a high hardness-to-modulus ratio (0.119). The films-substrate system displayed a good interface adhesion and a good friction/wear properties with the friction coefficient of about 0.1, the special wear rate in the magnitude order of 10−6 mm3 m−1 N−1 together with little film cracking and interface delaminating even at considerably high contact load, when sliding against Si3N4 (silicon nitride) ball using ball-on-disc wear tester under Kokubo simulation body fluid (SBF) at room temperature. The high wear-resistance is in accordance with the high ductility of the films, the good modulus match in the films-substrate system, and the high hardness-to-modulus ratio of the films. The nano-indentation response, the film-substrate adhesion behaviors and the tribological properties are in accordance and can be ascribed to the high activity of the nanocrystalline Ti substrate

Improvement of Tribological Behaviour of Biomedical Nanocrystalline Titanium by Magnetron Sputtered CNx/SiC Double Layer Films

2011 ◽  
Vol 284-286 ◽  
pp. 825-828
Author(s):  
Jia Ming Ji ◽  
Xiao Jing Xu ◽  
Dan Chen ◽  
Xi Ling Xin ◽  
Kun Tian ◽  
...  
Keyword(s):  
Double Layer ◽  
Room Temperature ◽  
Titanium Substrate ◽  
High Hardness ◽  
Tribological Behaviour ◽  
Wear Properties ◽  
Silicon Carbon ◽  
Nanocrystalline Titanium ◽  
Cnx Films ◽  
Sic Films

The nano-indentation response and the friction and wear properties of the CNx/SiC (carbon nitride /silicon carbon) double layer thin films (SiC films as interlayer) deposited on nanocrystalline titanium substrate using magnetron sputtering technique at room temperature were investigated. The results show that the CNx films exhibited a low nano-hardness of 8.0 GPa and Young's modulus of 55.0 GPa but a high hardness-to-modulus ratio of 0.146. As sliding against Si3N4 (silicon nitride) ball under Kokubo simulation body fluid (SBF) at room temperature, the CNx films exhibited the superior tribological properties with the friction coefficients of about 0.1 and the special wear rate of about 1.6×10−6 mm3/Nm.

Advances in Stem Instrumentation for Biology

1990 ◽  
Vol 48 (1) ◽  
pp. 362-363
Author(s):  
J. S. Wall
Keyword(s):  
Scanning Transmission Electron Microscope ◽  
Carbon Films ◽  
Specimen Preparation ◽  
Material Deposition ◽  
Active User ◽  
Percent Improvement ◽  
Scanning Transmission ◽  
The Moment ◽  
Film Substrate ◽  
High Level

The forte of the Scanning transmission Electron Microscope (STEM) is high resolution imaging with high contrast on thin specimens, as demonstrated by visualization of single heavy atoms. of equal importance for biology is the efficient utilization of all available signals, permitting low dose imaging of unstained single molecules such as DNA.Our work at Brookhaven has concentrated on: 1) design and construction of instruments optimized for a narrow range of biological applications and 2) use of such instruments in a very active user/collaborator program. Therefore our program is highly interactive with a strong emphasis on producing results which are interpretable with a high level of confidence.The major challenge we face at the moment is specimen preparation. The resolution of the STEM is better than 2.5 A, but measurements of resolution vs. dose level off at a resolution of 20 A at a dose of 10 el/A2 on a well-behaved biological specimen such as TMV (tobacco mosaic virus). To track down this problem we are examining all aspects of specimen preparation: purification of biological material, deposition on the thin film substrate, washing, fast freezing and freeze drying. As we attempt to improve our equipment/technique, we use image analysis of TMV internal controls included in all STEM samples as a monitor sensitive enough to detect even a few percent improvement. For delicate specimens, carbon films can be very harsh-leading to disruption of the sample. Therefore we are developing conducting polymer films as alternative substrates, as described elsewhere in these Proceedings. For specimen preparation studies, we have identified (from our user/collaborator program ) a variety of “canary” specimens, each uniquely sensitive to one particular aspect of sample preparation, so we can attempt to separate the variables involved.

Microcrystalline silicon–carbon films deposited by silane–methane mixture highly diluted in hydrogen

2006 ◽  
Vol 511-512 ◽  
pp. 399-403 ◽  
Author(s):  
U. Coscia ◽  
G. Ambrosone ◽  
S. Lettieri ◽  
P. Maddalena ◽  
S. Ferrero
Keyword(s):  
Carbon Films ◽  
Microcrystalline Silicon ◽  
Silicon Carbon ◽  
Methane Mixture

Study of the spectral dependence of the absorption coefficient of undoped silicon-carbon films

2012 ◽  
Vol 41 (8) ◽  
pp. 489-490
Author(s):  
M. D. Malinkovich ◽  
Yu. N. Parkhomenko ◽  
M. L. Shupegin ◽  
A. P. Bliev ◽  
A. V. Gritsenko
Keyword(s):  
Absorption Coefficient ◽  
Spectral Dependence ◽  
Carbon Films ◽  
Silicon Carbon

Precision Coating of ta-C Films on Quartz Surfaces

2020 ◽  
Author(s):  
Kotaro Kawai ◽  
Yuki Hirata ◽  
Hiroki Akasaka ◽  
Naoto Ohtake
Keyword(s):  
Cutting Tools ◽  
Three Dimensional ◽  
High Hardness ◽  
Carbon Films ◽  
Vacuum Arc ◽  
High Wear Resistance ◽  
Chemical Inertness ◽  
Filtered Cathodic Vacuum Arc ◽  
Surface Morphologies

Abstract Diamond-like carbon (DLC) films have excellent properties such as high hardness, low friction coefficient, high wear resistance, chemical inertness and so on. Because DLC film is considered as an effective coating material to improve their surface properties, this films are used in various applications such as parts for automobiles engines, hard disk surfaces, cutting tools and dies, and so on. DLC films consist of a mixture of sp2 bonded carbon atoms and sp3 bonded carbon atoms. Among them, ta-C film is known as the hardest and strongest film since it mainly consists of sp3 bonded carbon atoms. One of deposition methods to form ta-C is Filtered Cathodic Vacuum Arc (FCVA). The characteristic of this method is that it is possible to remove the droplets and form a high-quality film.. However, even though lots of mechanical components which require ta-C coating have three-dimensionally shapes, it is difficult to coat ta-C film three dimensionally by using FCVA process. At present, researches on 3D deposition of amorphous carbon films on three dimensional components is still insufficient, and investigation reports on the deposition mechanism and characterization of the deposited films are even more limited. In this study, we tried to deposit films on 3D components by the FCVA method and evaluated the microstructure and surface morphologies of films. Although films were coated successfully in the entire surfaces, different properties were showed depending on the location of components. These properties were investigated by Raman spectroscopy and laser microscope.

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