scholarly journals Structure and optical properties of diamond-like carbon coatings

2018 ◽  
Vol 63 (3) ◽  
pp. 280-289
Author(s):  
N. M. Chekan ◽  
I. P. Akula ◽  
E. P. Shpak ◽  
A. N. Navitskii
Keyword(s):  
Hybrid Method ◽  
Open Space ◽  
Chemical Deposition ◽  
Temperature Cycling ◽  
Space Environment ◽  
Film Material ◽  
Dlc Coatings ◽  
Mechanical And Tribological Properties ◽  
Hydrocarbon Gas ◽  
Physical And Chemical

Using a hybrid method of cathodic arc (PVD) and chemical (CVD) deposition from the gas phase, a new type of coatings containing high amount of sp3 bonds of carbon, capable of absorbing effectively light has been developed.This thin film material is a promised one for optical devices operating in open space environment as antireflective coating  for photoreceiver bodies. The hybrid method permits to obtain effective light absorbing coatings having excellent mechanical and tribological properties and is able to sustain temperature cycling in a range from plus 150 to minus 100 oC.  The optical characteristics of DLC coatings were studied depending on the content of sp2bound content. The combined physical and chemical deposition of DLC coatings allows to achieve a sufficiently high light absorption (a~10 5 cm–1) and low reflection with a relatively small coating thickness about 1 mm. It has been established that the antireflective properties of such coatings depend on the conditions for their preparation, first of all on hydrocarbon gas pressure 

Formation Hybrid Method of Multilayer Biocoatings, Based on PVD Technology

2013 ◽  
Vol 872 ◽  
pp. 241-247
Author(s):  
Sergey Ivanovich Tverdokhlebov ◽  
Evgeniy Viktorovich Shesterikov ◽  
Alena Igorevna Malchikhina
Keyword(s):  
Calcium Phosphate ◽  
Hybrid Method ◽  
Multilayer Coating ◽  
Rf Magnetron Sputtering ◽  
Hybrid Coatings ◽  
Mechanical And Tribological Properties ◽  
Technical Requirements ◽  
Phosphate Coatings ◽  
Calcium Phosphate Coatings ◽  
Physical And Chemical

Hybrid method of obtaining calcium-phosphate coatings is presented in this article. Physical and chemical, mechanical and tribological hybrid coatings research makes it possible to determine the coatings formation modes satisfying medical and technical requirements. This multilayer coating consists of an oxide underlayer formed by gas thermal oxidation and calcium phosphate layer formed by RF magnetron sputtering at a frequency of 13.56 MHz. Experiments were carried out in different modes. Calcium-phosphate coatings formed in mixture of argon and oxygen at 1:1 ratio pressure of 0.3 Pa have the best physical and chemical, mechanical and tribological properties.

METHANOGENIC ARCHAEA IN THE SPACE ENVIRONMENT

2021 ◽  
Vol 55 (1) ◽  
pp. 63-69
Author(s):  
V.I. Oshurkova ◽  
◽  
Е.А. Deshevaya ◽  
N.E. Suzina ◽  
N.E. Shubralova ◽  
...  
Keyword(s):  
Open Space ◽  
Space Station ◽  
Methanogenic Archaea ◽  
Space Environment ◽  
External Exposure ◽  
International Space ◽  
Methanosarcina Mazei ◽  
Dormant Cells ◽  
Space Vacuum ◽  
Vacuum Uv

Next phase of experiment TEST is aimed to evaluate microbial viability after a prolonged external exposure on the International space station (ISS). Methanogenic archaea isolated from various habitats have been tested in ground facilities for the ability to survive exposure to such open space factors as UV and vacuum. Methanosarcina mazei S-6T (VKM B-1636T) was found to be the most viable and, therefore, suitable for the experiment. Our investigations showed that the Methanosarcina mazei population maintained viability in the course of 24-month exposure. On this evidence we conclude that genome of this metanogenic archaea possesses mechanisms against the space vacuum, UV and thermal differences that, probably, underlie the ability of the strain to form peculiar cyst-like dormant cells.

Performance evaluation on three-forced choice pure tone audiometry in open space environment

2021 ◽  
Vol 150 (4) ◽  
pp. A142-A143
Author(s):  
Dhany Arifianto ◽  
Fiqiyah U. Azmi ◽  
Naomi Ashilah ◽  
Bagus A. Herlambang ◽  
Nyilo Purnami
Keyword(s):  
Performance Evaluation ◽  
Pure Tone ◽  
Open Space ◽  
Pure Tone Audiometry ◽  
Forced Choice ◽  
Space Environment

Characterization of Surface Roughness

2000 ◽  
Vol 6 (S2) ◽  
pp. 916-917
Author(s):  
John C. Russ
Keyword(s):  
Surface Roughness ◽  
Chemical Deposition ◽  
Irregular Surfaces ◽  
X Ray ◽  
Surface Areas ◽  
Raster Scan ◽  
Vertical Displacements ◽  
Physical And Chemical ◽  
Deposition Techniques

Because of the session at this Microscopy and Microanalysis 2000 meeting concerned with the microanalysis of irregular surfaces, it seems appropriate to briefly review the methods used for the characterization of rough surfaces. This includes both mathematical tools for the concise description of surface roughness, and instruments used to acquire the necessary data. These methods are widely used in industry to characterize and specify the roughness of surfaces prepared by various machining, grinding, polishing, chemical etching, and physical and chemical deposition techniques, and to correlate the surface roughness with performance.Historically, surface roughness has been measured by performing a linear traverse with a mechanical stylus that is sensitive to vertical displacements of nm but with a lateral resolution on the order of pm, which is quite similar to the dimensions of the region analyzed by X-ray microanalysis. Recently, more comprehensive characterizations have been obtained using a raster scan over surface areas.

THE INFLUENCE OF SILICON-DOPED DIAMOND-LIKE CARBON COATING ON THE WEAR OF IONIC LIQUID LUBRICATED FRICTION PAIRS

Tribologia ◽  
2018 ◽  
Vol 282 (6) ◽  
pp. 97-106 ◽  
Author(s):  
Krystian MILEWSKI ◽  
Monika MADEJ ◽  
Joanna KOWALCZYK ◽  
Dariusz OZIMINA
Keyword(s):  
Ionic Liquid ◽  
Cross Sections ◽  
Chemical Deposition ◽  
Tribological Behaviour ◽  
Dlc Coatings ◽  
Before And After ◽  
The Coefficient Of Friction ◽  
Optical Profilometer ◽  
Silicon Doped ◽  
Ball On Disc

This article reports the results of the study of an a-C:H:Si coating doped with silicon and produced by chemical deposition (PACVD). The effect of the coating on the tribological behaviour of IL-lubricated friction pairs was evaluated. The properties of the 100Cr6 steel specimens with and without the coating were compared. Scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis were used for imaging the morphology of the coating surfaces and cross-sections and for identifying the elements in the coating composition. The contact angle of the investigated surfaces was measured with an optical tensiometer. Friction tests were performed on a ball-on-disc tribometer under dry friction and when lubricated with trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl) amide ionic liquid. The geometrical structure of the surfaces before and after the tribological tests was measured using an optical profilometer. The ionic liquid used with the silicon-doped diamond-like coating under friction conditions reduced the coefficient of friction and wear. The results obtained from the tests and analysis allow for the conclusion that the use of DLC coatings a-C:H:Si lubricated with trihexyltetradecylphosphonium Bis(trifluoromethylsulfonyl) amide contributes towards the improvement of tribological properties of sliding surfaces under friction.

scholarly journals Investigation of changes in the properties of diamond-like films under friction by the XPS method

2021 ◽  
Vol 2131 (5) ◽  
pp. 052038
Author(s):  
A V Sidashov ◽  
M V Boiko ◽  
E I Luneva ◽  
A M Popov
Keyword(s):  
Tribological Properties ◽  
Photoelectron Spectroscopy ◽  
Etching Time ◽  
Energy Position ◽  
Dlc Coatings ◽  
Mechanical And Tribological Properties ◽  
Dlc Coating ◽  
Electron Line ◽  
Antifriction Properties

Abstract The combination of unique physicochemical, mechanical and tribological properties of diamond-like coatings determines the prospects for their use in critical friction units, including those operating in a rarefied atmosphere and vacuum. The properties of diamond-like carbon (DLC) coatings depend on the contribution of the sp2 and sp3 fractions of the carbon hybrid atomic electron orbitals. Modern methods of determining the graphite and diamond proportion in coatings are time-consuming and insufficiently accurate. In addition, the determination of the sp3/sp2 ratio is often difficult due to the displacement of the energy position of the C1s electron line. In this paper, the change in the chemical state of carbon over the thickness of a diamond-like coating is studied by X-ray photoelectron spectroscopy. Analysis of the carbon line fine structure of the differential graphite spectra (sp2 bonds) and diamond (sp3 bonds) allowed us to establish the parameter δ, which determines the ratio of the graphite and diamond components in the DLC coating. Profiling with Ar+ ions of the diamondlike coating surface showed that with an increase in the etching time, the proportion of amorphized carbon increases, which means that the antifriction properties increase with the abrasion of the coating. The obtained regularities allow us to predict changes in the tribological properties of DLC coatings during operation. Ion profiling also allows to determine the thickness of coatings with high accuracy.

scholarly journals FAKTOR YANG MEMPENGARUHI KESESUAIAN IMPLEMENTASI DENGAN RENCANA TATA BANGUNAN DAN LINGKUNGAN DALAM PROGRAM PENATAAN LINGKUNGAN PERMUKIMAN BERBASIS KOMUNITAS STUDI KASUS: DESA JENDI WONOGIRI

Arsitektura ◽  
2017 ◽  
Vol 13 (2) ◽  
Author(s):  
Antissia Meuthia Rizky ◽  
Winny Astuti ◽  
Galing Yudana
Keyword(s):  
Environmental Planning ◽  
Open Space ◽  
Development Program ◽  
Pilot Project ◽  
Space Environment ◽  
Neighborhood Development ◽  
Public Open Space ◽  
Identity Concept ◽  
The Face ◽  
Money Attitude

<p><em>Jendi village, selected as a pilot project which received the Neighborhood Development program (ND) is the government's effort to solve the poor’s problemsbased onimprovementof housing’s quality. To achieve the goal, the building implementation should be based on the plan that has been made. So, it makes a question “is the implementation of Jendi Village based on Building and Environmental Planning and how the factors affect the suitability itself.”This research uses quantities research methods to analyze the factors that affect the implementation of RTBL Jendi Village. The suitability is found from the analysis which compare the plan and the implementation related with each aspect of planning. To know the factors that affect the implementation of RTBL Jendi Village, the analysis is done using the quantities methods from combination of implementable suitability and the suitable factors of implementation.  The research obtain that the implementable suitability with RTBL of Jendi Village has 81,25% with the suitability from streets, public open space, environment identity concept, the face of the streets, drainage. Factors that affect the implementable suitability with RTBL Jendi Village is communication, human resource, authority, infrastructures and facilities, money, attitude and commitment, bureaucracy structures, and support. And the other factor which not affected with suitability is information resource.</em></p><p><em><strong>Keywords</strong>: Factor that affect the implementable suitability, RTBL, Neighborhood Development</em></p>

scholarly journals A Strategy for Alleviating Micro Arcing during HiPIMS Deposition of DLC Coatings

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1038
Author(s):  
Catalin Vitelaru ◽  
Anca Constantina Parau ◽  
Lidia Ruxandra Constantin ◽  
Adrian Emil Kiss ◽  
Alina Vladescu ◽  
...  
Keyword(s):  
Surface Defects ◽  
Gas Mixture ◽  
Diamond Like Carbon ◽  
Process Stability ◽  
Dlc Coatings ◽  
Mechanical And Tribological Properties ◽  
Self Bias ◽  
Nanoindentation Hardness ◽  
Steel Substrates ◽  
Deposition Conditions

In this work, we investigate the use of high power impulse magnetron sputtering (HiPIMS) for the deposition of micrometer thick diamond like carbon (DLC) coatings on Si and steel substrates. The adhesion on both types of substrates is ensured with a simple Ti interlayer, while the energy of impinging ions is adjusted by using RF (Radio Frequency) biasing on the substrate at −100 V DC self-bias. Addition of acetylene to the working Ar+Ne atmosphere is investigated as an alternative to Ar sputtering, to improve process stability and coatings quality. Peak current is maintained constant, providing reliable comparison between different deposition conditions used in this study. The main advantages of adding acetylene to the Ar+Ne gas mixture are an increase of deposition rate by a factor of 2, when comparing to the Ar+Ne process. Moreover, a decrease of the number of surface defects, from ~40% surface defects coverage to ~1% is obtained, due to reduced arcing. The mechanical and tribological properties of the deposited DLC films remain comparable for all investigated gas compositions. Nanoindentation hardness of all coatings is in the range of 25 to 30 GPa, friction coefficient is between 0.05 and 0.1 and wear rate is in the range of 0.47 to 0.77 × 10−6 mm3 N−1m−1.

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