scholarly journals Resistance investigation of diamond-like carbon coatings to cyclic temperature changes

2021 ◽  
Vol 2056 (1) ◽  
pp. 012032
Author(s):  
M O Makeev ◽  
A S Osipkov ◽  
V I Batshev ◽  
P A Mikhalev ◽  
B A Parshin ◽  
...  
Keyword(s):  
Outer Space ◽  
High Hardness ◽  
Low Earth Orbit ◽  
High Wear Resistance ◽  
Large Temperature ◽  
Diamond Like Carbon ◽  
Optical Elements ◽  
Carbon Coatings ◽  
Temperature Changes ◽  
Cyclic Temperature

Abstract Optical elements used in outer space must be designed considering the effects of such factors as space vacuum, atomic oxygen in low Earth orbit, solar and space radiation, large temperature drops, gas release of spacecraft materials and structural elements, space dust and debris. In order to harden and protect mirror surfaces of optical elements from external factors, it has been promisingly applied diamond-like carbon coatings on their surface. These coatings are characterized by high strength and wear-resistant properties, in particular, high hardness, low friction coefficient, high wear resistance and chemical inertness. This leads to their widespread use in various fields of science and technology, including optical instrumentation. This paper presents the results of testing an aluminum mirror with a diamondlike carbon coating under the effect of cyclic temperature changes for determining their ability to withstand a rapid cyclic ambient temperature change, and specifically, to maintain optical and mechanical properties.

scholarly journals In vivo biocompatibility of diamond-like carbon films containing TiO2 nanoparticles for biomedical applications

2021 ◽  
Vol 32 (9) ◽  
Author(s):  
C. C. Wachesk ◽  
S. H. Seabra ◽  
T. A. T. Dos Santos ◽  
V. J. Trava-Airoldi ◽  
A. O. Lobo ◽  
...  
Keyword(s):  
Inflammatory Process ◽  
Antimicrobial Properties ◽  
Chemical Vapor ◽  
High Hardness ◽  
Carbon Films ◽  
High Wear Resistance ◽  
Diamond Like Carbon ◽  
Dlc Coatings ◽  
Inflammatory Reactions

AbstractHybrid diamond-like carbon (DLC) with incorporated titanium dioxide (TiO2) nanoparticle coatings have low friction coefficient, high wear resistance, high hardness, biocompatibility, and high chemical stability. They could be employed to modify biomedical alloys surfaces for numerous applications in biomedical engineering. Here we investigate for the first time the in vivo inflammatory process of DLC coatings with incorporated TiO2 nanoparticles. TiO2-DLC films were grown on AISI 316 stainless-steel substrates using plasma-enhanced chemical vapor deposition. The coated substrates were implanted in CF1 mice peritoneum. The in vivo cytotoxicity and biocompatibility of the samples were analyzed from macrophage lavage. Analysis in the first weeks after implantation could be helpful to evaluate the acute cytotoxicity generated after a possible inflammatory process. The in vivo results showed no inflammatory process. A significant increase in nitric oxide production on the uncoated substrates was confirmed through cytometry, and the coated substrates demonstrated biocompatibility. The presence of TiO2 nanoparticles enhanced the wound healing activity, due to their astringent and antimicrobial properties. DLC and TiO2-DLC coatings were considered biocompatible, and the presence of TiO2 nanoparticles reduced the inflammatory reactions, increasing DLC biocompatibility.

Influence on the Proprieties of PET Coated Diamond-Like Carbon Film for Different Preparing Condition by PECVD

2011 ◽  
Vol 80-81 ◽  
pp. 104-107 ◽  
Author(s):  
Gai Mei Zhang ◽  
Qiang Chen ◽  
Wen Cai Xu ◽  
Fei Pan ◽  
Bao Ping Miao
Keyword(s):  
Binding Capacity ◽  
Carbon Film ◽  
Chemical Vapor ◽  
High Hardness ◽  
Barrier Properties ◽  
High Wear Resistance ◽  
Diamond Like Carbon ◽  
Dlc Coating ◽  
Atomic Force ◽  
Pet Film

Diamond-like carbon (DLC) films exhibit high hardness, high wear resistance and a low friction coefficient. They are extensively utilized in the mechanical, electronic and biomedical industries. Due to the gas barrier properties, it is used in the food industry also. To investigate the binding capacity of the DLC with the substrate and reduce the contamination for foods. The DLC (a-C: H) films on the glass slide and PET film were prepared successfully for different process parameters by plasma enhanced chemical vapor deposition (PECVD). In order to characterize the DLC film, the images of DLC was visualized by the atomic force microscope (AFM). The films were analyzed by Fourier transform infrared spectroscopy (RTIF). The contact angle and oxygen permeation analyzer (OTR) of the PET with and without the DLC coating were investigated experimentally. The results show that the DLC coating can improve the barriers and surface properties.

On the adhesion of diamond‐like carbon coatings deposited by low‐pressure plasma on 316L stainless steel

2021 ◽  
Author(s):  
Gabriel Morand ◽  
Pascale Chevallier ◽  
Linda Bonilla‐Gameros ◽  
Stéphane Turgeon ◽  
Maxime Cloutier ◽  
...  
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Low Pressure ◽  
Diamond Like Carbon ◽  
Carbon Coatings ◽  
Pressure Plasma ◽  
Low Pressure Plasma

Diamond and Diamond Like Carbon Coatings

1994 ◽  
Vol 72 (3) ◽  
pp. 120-123 ◽  
Author(s):  
I.R. McColl ◽  
J.V. Wood ◽  
D.M. Grant
Keyword(s):  
Diamond Like Carbon ◽  
Carbon Coatings

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.

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