scholarly journals Investigation of Friction and Wear Performance of Diamond Coating under Si3N4 Friction Pair

Mechanika ◽  
2021 ◽  
Vol 27 (5) ◽  
pp. 421-428
Author(s):  
Feng Lu ◽  
Yueyao Wang ◽  
Huixin Li ◽  
Tianen Hao ◽  
GuangYu Yan ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Methane Concentration ◽  
Friction Pair ◽  
Chemical Vapor ◽  
Wear Test ◽  
Chemical Vapor Deposition Method ◽  
Diamond Coatings ◽  
Raman Spectrometry ◽  
Lubrication Conditions ◽  
Methane Concentrations

In this study, diamond coatings were deposited through the hot filament chemical vapor deposition method on cemented carbide under different methane concentrations, ranging from 1% to 5%, to analyze the performance of the diamond coatings under different loads and lubrication conditions . Friction and wear tests were carried out using ball-disk friction and wear tester under different loads and lubrication conditions. Scanning electron microscopy, high-resolution Raman spectrometry, optical microscopy, and a surface profiler were used to observe the surface morphology and quality of the coatings after the wear test. The results revealed that the coating prepared under 3% methane concentration was more stable during the friction test than that prepared under other methane concentrations. In addition, the coating prepared under 5% methane concentration had poor adhesion and experienced failure under excessive load. Furthermore, lubricating the friction surface with water effectively reduced the formation of abrasive wear and the friction coefficient, and thus the sample reached the stable stage faster. In addition, the wear rate of the coating under wet condition was approximately 4–5 times less than that under dry friction conditions.

Improvement of Adhesion of Diamond Coatings to WC(CO) Tool Substrates

1994 ◽  
Vol 363 ◽  
Author(s):  
W. D. Fan ◽  
K. Jagannadham ◽  
J. Narayan
Keyword(s):  
Diamond Film ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Composite Coatings ◽  
Composite Layer ◽  
Chemical Vapor ◽  
Wear Test ◽  
Ceramic Coatings ◽  
Diamond Coatings ◽  
Composite Layers

AbstractAdhesion of diamond coatings to cutting tool substrates is an important property that is needed to replace the polycrystalline diamond tools (PCD) in machine tool applications. The improvement in adhesion of diamond on WC(Co) tool substrates is brought about by formation of a composite layer. Composite layers made up of TiC or TiN and diamond were formed by laser physical vapor deposition of ceramic coatings and hot filament chemical vapor deposition of diamond films. A first layer of discontinuous diamond film on WC is embedded in the ceramic coatings followed by growth of a continuous diamond film that maintains continuity with the first diamond layer. The composite coatings were characterized by SEM and Raman spectroscopy. Adhesion and wear resistance of the diamond coatings were measured using a polishing wear test. The mechanisms of improvement in adhesion were analyzed by finite element modeling. Results show that TiC composite layers improve the adhesion of diamond coatings significantly. This improvement is considered to arise from the modification of the thermal stress at the interface between the diamond film and the WC(Co) tool substrate.

Near-interface characterization of diamond films on silica and silicon

1991 ◽  
Vol 6 (6) ◽  
pp. 1264-1277 ◽  
Author(s):  
D.J. Pickrell ◽  
W. Zhu ◽  
A.R. Badzian ◽  
R.E. Newnham ◽  
R. Messier
Keyword(s):  
Methane Concentration ◽  
Microwave Plasma ◽  
Substrate Surface ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Hydrogen Gas ◽  
Growth Stages ◽  
Electron Microscopies ◽  
Transmission Electron ◽  
Methane Concentrations

The near-interface structure of diamond films grown from a methane and hydrogen gas mixture by microwave plasma enhanced chemical vapor deposition has been studied. Freestanding diamond films grown on both silica and silicon at two different methane concentrations were analyzed by scanning and transmission electron microscopies, electron diffraction, Raman spectroscopy, and secondary ion mass spectroscopy. It was found that the substrate chemistry greatly influenced the nature of the carbon initially deposited on the substrate surface. Diamond formed large flat contact areas on silicon, whereas on silica a particulate type of intermediate layer formed first because of the chemical reactions occurring on and/or with the surface. It was found that the phase content of the films was greatly affected by the methane concentration in hydrogen. At the low (1.0% or less) methane concentrations in hydrogen, phase pure diamond formed; while at the high (5.0%) methane concentration in hydrogen, graphite and disordered carbon were codeposited along with diamond during the early growth stages. Silicon carbide was detected at the diamond interfaces which appeared in discrete areas on silica as opposed to a rather continuous layer as is believed to form on silicon.

scholarly journals Interaction of Methane Concentration and Deposition Temperature in Atmospheric Laser Based CVD Diamond Deposition on Hard Metal

Coatings ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 537
Author(s):  
Markus Prieske ◽  
Sven Müller ◽  
Peer Woizeschke
Keyword(s):  
Coating Thickness ◽  
Deposition Temperature ◽  
Laser Scanning ◽  
Methane Concentration ◽  
Chemical Vapour ◽  
Cvd Diamond ◽  
Hard Metal ◽  
Process Temperature ◽  
Diamond Coatings ◽  
Methane Concentrations

For laser-based plasma chemical vapour deposition (CVD) of diamond on hard metal at atmospheric pressure, without a vacuum chamber, the interaction between the deposition temperature and the methane concentration has to be understood to adjust the coating thickness, deposition duration, and medium diamond crystal size. The hypothesis of this study is that a wider range of methane concentrations could be used to deposit microcrystalline diamond coatings due to the increasing etching and deposition rates with rising deposition temperatures. The deposition of the CVD diamond coatings was carried out on K10 hard metal substrates. The process temperature and the methane concentration were varied from 650 to 1100 °C and from 0.15% to 5.0%, respectively. The coatings were analysed by scanning electron and 3D laser-scanning confocal microscopy, energy dispersive X-ray and micro-Raman spectroscopy, as well as cryofracture-based microscopy analysis. The results showed that microcrystalline diamond coatings could be deposited in a wider range of methane concentrations when increasing the process temperature. The coating thickness saturates depending on the process temperature even though the methane concentration constantly increases. The coating thickness increases with an increasing deposition temperature until the cobalt diffusion hinders the deposition at the process temperature of 1100 °C.

scholarly journals Mechanical and Tribological Attributes of Al-CNT-Sn Composites Prepared by Press and Sintering

2021 ◽  
Vol 5 (8) ◽  
pp. 215
Author(s):  
Vilas Dhore ◽  
Walmik Rathod ◽  
Kashinath Patil
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Aluminum Matrix ◽  
Chemical Vapor ◽  
Wear Test ◽  
Deposition Process ◽  
Weight Percent ◽  
Aluminum Matrix Composite

Carbon nanotubes (CNTs) have shown tremendous progress during the past two decades due to their extraordinary properties. With CNTs added as an alloying element, various engineering materials exhibit better mechanical properties. Multi-walled carbon nanotubes (MWCNT) were synthesized in-house by chemical vapor deposition process. Carbon nanotube-reinforced aluminum composites were prepared by cold pressing (or compaction) and sintering using different fractions (0.5, 1.0, 1.5, and 2.0 weight percent) of MWCNTs. The Al-CNT composites consists of tin (Sn) at 1.0 wt. % in each composition. Tin promotes the sintering of aluminum matrix composite. The effect of CNT on the density, hardness, and wear behavior of the composites were studied. Wear tests were performed to determine friction and wear under dry, wet, and hot conditions under varying loads from 5 N to 20 N. X-ray diffraction, Raman spectroscopy, scanning electron microscopy, and transmission electron microscopy techniques were used for the characterization. This investigation shows that increased CNT content significantly improves the hardness and wear resistance of the composites. The friction and wear were found to increase with operating temperature. A significant reduction in coefficient of friction and wear rate was observed with the application of oil during the wear test.

Surface Control of K9 Glass/Diamondunder Cold Plasma Assisted Cutting

2020 ◽  
Vol 993 ◽  
pp. 1104-1109
Author(s):  
Zheng Meng ◽  
Xin Liu ◽  
Ming Yu Wu ◽  
Jiyu Liu ◽  
Yang Chen ◽  
...  
Keyword(s):  
Brittle Material ◽  
Cold Plasma ◽  
Friction And Wear ◽  
Friction Pair ◽  
Wear Test ◽  
Plasma Jet ◽  
Tribological Performance ◽  
Surface Control ◽  
And Control ◽  
K9 Glass

Surface properties of K9 glass/diamond materials were controlled under the optical brittle material by cold plasma assisted cutting machining. The influence of cold plasma jet on the tribological performance of K9 glass/diamond friction pair was investigated using the friction and wear test. The experimental results show that the plasma can be penetrated the surface of the brittle material. Cold plasma jet can regulate and control the K9 glass/diamond materials surface property and improve anti-friction effect.

Anisotropic Plasma ChemicalVapor Deposition of Copper Films in Trenches

2003 ◽  
Vol 766 ◽  
Author(s):  
Kosuke Takenaka ◽  
Masao Onishi ◽  
Manabu Takenshita ◽  
Toshio Kinoshita ◽  
Kazunori Koga ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Deposition Rate ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Anisotropic Plasma ◽  
Bottom Surface ◽  
Chemical Vapor Deposition Method ◽  
Copper Films ◽  
Deposition Method ◽  
Via Holes

AbstractAn ion-assisted chemical vapor deposition method by which Cu is deposited preferentially from the bottom of trenches (anisotropic CVD) has been proposed in order to fill small via holes and trenches. By using Ar + H2 + C2H5OH[Cu(hfac)2] discharges with a ratio H2 / (H2 + Ar) = 83%, Cu is filled preferentially from the bottom of trenches without deposition on the sidewall and top surfaces. The deposition rate on the bottom surface of trenches is experimentally found to increase with decreasing its width.

scholarly journals Thermodynamics Controlled Sharp Transformation from InP to GaP Nanowires via Introducing Trace Amount of Gallium

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Zhenzhen Tian ◽  
Xiaoming Yuan ◽  
Ziran Zhang ◽  
Wuao Jia ◽  
Jian Zhou ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Driving Force ◽  
Chemical Vapor ◽  
Chemical Vapor Deposition Method ◽  
Nanowire Growth ◽  
Calphad Approach ◽  
Deposition Method ◽  
Large Area ◽  
Growth Phenomenon

AbstractGrowth of high-quality III–V nanowires at a low cost for optoelectronic and electronic applications is a long-term pursuit of research. Still, controlled synthesis of III–V nanowires using chemical vapor deposition method is challenge and lack theory guidance. Here, we show the growth of InP and GaP nanowires in a large area with a high density using a vacuum chemical vapor deposition method. It is revealed that high growth temperature is required to avoid oxide formation and increase the crystal purity of InP nanowires. Introduction of a small amount of Ga into the reactor leads to the formation of GaP nanowires instead of ternary InGaP nanowires. Thermodynamic calculation within the calculation of phase diagrams (CALPHAD) approach is applied to explain this novel growth phenomenon. Composition and driving force calculations of the solidification process demonstrate that only 1 at.% of Ga in the catalyst is enough to tune the nanowire formation from InP to GaP, since GaP nucleation shows a much larger driving force. The combined thermodynamic studies together with III–V nanowire growth studies provide an excellent example to guide the nanowire growth.

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