Thick Si-doped DLC coatings with high load bearing capacity on cold working tool steels by PECVD

2021 ◽  
pp. 1-19
Author(s):  
Xinyu Wang ◽  
Xudong Sui ◽  
Shuaituo Zhang ◽  
Mingming Yan ◽  
Yan Lu ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Cold Working ◽  
Chemical Vapor ◽  
Tool Steels ◽  
Dlc Coatings ◽  
Wear Rates ◽  
Si Doped ◽  
Silicon Doped ◽  
Hydrogenated Amorphous ◽  
Degree Of Graphitization

Abstract For improving the wear resistance, thick silicon doped hydrogenated amorphous carbon (a-SiC:H) coatings were deposited on cold working tool steels by Plasma Enhanced Chemical Vapor Deposition (PECVD) technology. The increase of the acetylene (C2H2) flow rate distinctly tuned the microstructure of a-SiC:H coatings, including an increase in the coating thickness (>15 μm), a decrease in the silicon content, a greater sp2/sp3 ratio and higher degree of graphitization. The highest hardness of 19.61 GPa and the greatest critical load of 50.7 N were obtained. The coating showed low wear rates against different friction pairs and presented excellent abrasive wear resistance at high applied load and the wear rates decreased with increasing loads, which exhibited an outstanding application prospect in cold working tool steels.

scholarly journals Impact of Mechanical Processes as a Pre-Sulphonitriding Treatment on Tribology Properties of Selected P/M Tool Steels

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3431 ◽  
Author(s):  
Daniel Toboła
Keyword(s):  
Wear Resistance ◽  
Cross Sections ◽  
Tool Steels ◽  
X Ray Diffraction ◽  
Wear Rates ◽  
Different Types ◽  
Pin On Disc ◽  
Slide Burnishing ◽  
Gas Quenching ◽  
Vacuum Furnaces

We have evaluated phase composition changes in the surface layer (SL) and wear resistance of steels investigated after various mechanical processes such as a pre-sulphonitriding treatments. Two various paths of surface modification were employed: Grinding–sulphonitriding (G-SN) and hard turning–slide burnishing–sulphonitriding (T-B-SN). Studies were carried out on Vanadis 8 and Vancron 40 tool steels, which are classified as advanced powder metallurgy (P/M) high-alloyed steels with different types and amounts of carbides. Heat treatment to the final hardness of 64 ± 1 HRC (Vanadis 8) and 62 ± 1 HRC (Vancron 40) was performed in vacuum furnaces with gas quenching. Precipitation of different types such as sulfides, nitrides, and carbides was observed using X-ray diffraction analysis. Tribological properties of SL were evaluated by pin-on-disc experiments. Pins of Al2O3 and 19MnB4 steel were used as counterbodies materials. 3D surface geometrical structure measurements were also performed. Wear tracks and cross-sections of SL were observed using optical and scanning electron microscopy. The three-stage process increases the wear resistance about 37% and 30%, respectively for Vanadis 8 and Vancron 40 (in case of alumina pins), whereas values of wear rates after tests performed against steel pins were very similar for two compared processes for both steels.

Improvement of wear resistance of some cold working tool steels

Wear ◽  
2017 ◽  
Vol 382-383 ◽  
pp. 29-39 ◽  
Author(s):  
Daniel Toboła ◽  
Witold Brostow ◽  
Kazimierz Czechowski ◽  
Piotr Rusek
Keyword(s):  
Wear Resistance ◽  
Cold Working ◽  
Tool Steels

scholarly journals Tribological Performance of Si-Doped Hydrogenated Diamond-Like Carbon Coatings in Different Biodiesel

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Annett Dorner-Reisel ◽  
Zeynep Burcu Kavaklioglu ◽  
Stefan Svoboda ◽  
Jürgen Engemann
Keyword(s):  
Methyl Ester ◽  
Biodiesel Production ◽  
Diamond Like Carbon ◽  
Tribological Behaviour ◽  
Carbon Coatings ◽  
Wear Rates ◽  
Si Doped ◽  
Silicon Doped ◽  
Polar Functional Groups

In this paper, two kinds of different biodiesel were tested in terms of their impact on wear resistance of Si-DLC coated 100Cr6 flat worn by an oscillating 100Cr6 ball. The knowledge about the tribological behaviour of different types of biodiesel is rare. Rape and soybean are two of the most common natural sources for biodiesel production. Also, if the quality of biodiesel seems to be similar and, according to the demands, biodiesel from different natural origin could affect changes in the tribological behaviour. Although, soybean methyl ester (SME) gives the best results at room temperature wear tests, 150°C SME reaches wear rates of Si-DLC flat against 100Cr6 ball almost double as high as rapeseed methyl ester (RME). It is evident that, with increasing fraction of oxidation stabilizer C23H32O2, the wear rate increases. For silicon doped hydrogenated diamond-like carbon is especially suitable, for use in biodiesels, where certain fraction of humidity, dissociated water, or polar functional groups may present.

scholarly journals Influence of Combined Mechanical Processes on Tribological Properties of Tool Steels Vanadis 8 and Vancron 40 With a Similar Hardness

2021 ◽  
Vol 7 ◽  
Author(s):  
Daniel Toboła ◽  
Aneta Łętocha
Keyword(s):  
Wear Resistance ◽  
Hard Turning ◽  
High Hardness ◽  
High Wear Resistance ◽  
Tool Steels ◽  
Wear Rates ◽  
Resistance Surface ◽  
Slide Burnishing ◽  
Gas Quenching ◽  
Vacuum Furnaces

Surface integrity is important factor for components exposed to wear, like cold working tools, which need to possess high hardness combined with high wear resistance. Surface treatments such as grinding, hard turning, and hard turning with slide burnishing have been developed for its improvement. Vancron 40 and Vanadis 8 tool steels, of different chemical composition and different types and amounts of carbides, were now investigated. Heat treatment was carried out in vacuum furnaces with gas quenching to hardness of Vancron 64 ± 1 HRC and of Vanadis 65 ± 1 HRC. 3D topography, optical and scanning electron microscopy, X-ray diffraction and ball-on-disc tribological tests against Al2O3 and 100Cr6 balls as counterparts were used to examine wear and friction. For both steels, the lowest values of dynamic frictions and wear rates against Al2O3 counterbodies were achieved after sequential process of hard turning with slide burnishing with a burnishing force of 180 N. For alumina balls, the increase of wear resistance, achieved after hard turning plus burnishing in comparison to grinding exceeds 50 and 60%, respectively for Vanadis 8 and Vancron 40 steels.

Comparative Analysis of Wear Rates of Microcrystalline Diamond and Diamond-Like Carbon Coatings Deposited on WС-Co Substrates

2016 ◽  
Vol 721 ◽  
pp. 436-440 ◽  
Author(s):  
Maxim Yashin ◽  
Andrei Bogatov ◽  
Vitali Podgursky
Keyword(s):  
Chemical Vapor ◽  
Diamond Like Carbon ◽  
Carbon Coatings ◽  
Dlc Coatings ◽  
Wear Rates ◽  
Dlc Coating ◽  
Electron Microscopes ◽  
Scanning Electron Microscopes ◽  
Wear Tests ◽  
Plate Type

The study investigates the wear of microcrystalline diamond (MCD) and diamond-like carbon (DLC) coatings. The MCD and DLC coatings were grown by plasma enhanced chemical vapor deposition (PECVD) method on WC-Co substrates. The sliding wear tests were performed on the ball-on-plate type of tribometer in reciprocating mode. The ball-cratering wear tests were carried out using Calo tester. The mechanical profilometer, optical and scanning electron microscopes (SEM) were used for investigation of the surface morphology of the wear scars. The wear of DLC coating is more intense in comparison to the MCD coating. In contrast to the MCD coating, no evidence of the DLC coating deflection was found.

Wear on SAE 52100 with Nanocoating Al2O3 by MOCVD Process

2006 ◽  
Vol 45 ◽  
pp. 1336-1341 ◽  
Author(s):  
J.D. Bressan ◽  
G.A. Battiston ◽  
R. Gerbasi ◽  
D.P. Daros
Keyword(s):  
Wear Resistance ◽  
Chemical Vapor ◽  
Film Deposition ◽  
Organic Chemical ◽  
Wear Rates ◽  
Film Adhesion ◽  
Metal Organic ◽  
Organic Chemical Vapor Deposition ◽  
Sliding Distance ◽  
Ball On Disc

Present work investigates the wear resistance of SAE 52100 steel coated with nanocoating Al2O3 by the Metal-organic Chemical Vapor Deposition (MOCVD) process. The wear tests by sliding and abrasion were performed in a ball-on-disc apparatus whose ball substrate was SAE 52100 steel. The MOCVD nanocoating processes were carried out in a research laboratory apparatus at 240oC under N2 + O2+ H2O atmosphere. The counterface discs were ABNT 1008 steel sheet used in the Brazilian fridge industry. The wear resistance of the nanocoated steel spheres were evaluated through the ball-on-disc test, using a sliding velocity 0.6 m/s, normal loads of 20 N and 30 N, total sliding distance up to 2400 m and controlled conditions of temperature and humidity at 25oC and 42% respectively. The balls material substrates were submitted to two distinct coating procedures: direct Al2O3 film deposition on substrate, or phosphatizing and then Al2O3 deposition via MOCVD. The discs were tested as received. From the plotted graphs of cumulative lost volume versus sliding distance, lower wear rates were observed for the nanocoated SAE 52100 sphere compared to the sphere without coating, i.e., nanocoating with Al2O3 increases the sphere wear resistance. This is probably due to a reasonable film adhesion. The balls phosphatized and coated with Al2O3 showed similar wear resistance but a spherical micro-grain film of Al2O3 . The wear mechanisms were also examined by scanning electron microscopy.

Light-Induced Degradation in Solar Cells with Hydrogenated Amorphous Silicon-Sulfur Active Layers

2002 ◽  
Vol 715 ◽  
Author(s):  
Wei Xu ◽  
P. C. Taylor
Keyword(s):  
Solar Cells ◽  
Practical Importance ◽  
Chemical Vapor ◽  
Photovoltaic Devices ◽  
Sulfur Concentration ◽  
Active Layers ◽  
Conversion Efficiencies ◽  
Hydrogenated Amorphous ◽  
Secondary Ion ◽  
Initial Conversion

AbstractWe have made a series of a-SiSx:H based solar cells, with a pin structure, in a multichamber plasma enhanced chemical vapor deposition (PECVD) system. The sulfur concentration ranges from zero to 5 x 1018 cm-3 as measured by secondary ion mass spectroscopy. The initial conversion efficiencies of cells in this series with sulfur concentrations ≤ 1018 cm-3 are approximately 7%. The time constants for degradation increase with increasing sulfur concentration, but not fast enough to be of practical importance in photovoltaic devices.

High Rate Deposition of Stable Hydrogenated Amorphous Silicon in Transition from Amorphous to Microcrystalline Silicon

2003 ◽  
Vol 762 ◽  
Author(s):  
Guofu Hou ◽  
Xinhua Geng ◽  
Xiaodan Zhang ◽  
Ying Zhao ◽  
Junming Xue ◽  
...  
Keyword(s):  
Phase Transition ◽  
Amorphous Silicon ◽  
Hydrogenated Amorphous Silicon ◽  
Chemical Vapor ◽  
High Rate ◽  
Very High Frequency ◽  
High Quality ◽  
Working Pressure ◽  
Hydrogen Dilution ◽  
Hydrogenated Amorphous

AbstractHigh rate deposition of high quality and stable hydrogenated amorphous silicon (a-Si:H) films were performed near the threshold of amorphous to microcrystalline phase transition using a very high frequency plasma enhanced chemical vapor deposition (VHF-PECVD) method. The effect of hydrogen dilution on optic-electronic and structural properties of these films was investigated by Fourier-transform infrared (FTIR) spectroscopy, Raman scattering and constant photocurrent method (CPM). Experiment showed that although the phase transition was much influenced by hydrogen dilution, it also strongly depended on substrate temperature, working pressure and plasma power. With optimized condition high quality and high stable a-Si:H films, which exhibit σph/σd of 4.4×106 and deposition rate of 28.8Å/s, have been obtained.

DOUBLE SEVEN

Alloy Digest ◽  
1962 ◽  
Vol 11 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Physical Properties ◽  
Cold Working ◽  
High Hardness ◽  
Heat Treating ◽  
Heavy Duty ◽  
High Carbon ◽  
Die Steel ◽  
High Chromium

Abstract DOUBLE SEVEN is an air hardening high-carbon high-chromium tool and die steel having high hardness and wear resistance. It is recommended for shear blades, cold working tools, and heavy duty dies. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-124. Producer or source: Edgar Allen & Company Ltd, Imperial Steel Works.

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