scholarly journals Processing of Spark Plasma Sintered Fe Alloy and Enhancing Its Surface Properties by AlCrN Monolayer Coating by Cathodic Arc Plasma Physical Vapor Deposition Process

Coatings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1166
Author(s):  
T. Sampath Kumar ◽  
A. Raja Annamalai ◽  
Muthe Srikanth ◽  
Chun-Ping Jen
Keyword(s):  
Surface Properties ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Sintered Sample ◽  
The Other ◽  
Uniform Structure ◽  
Arc Plasma ◽  
Compact Sample ◽  
Spark Plasma ◽  
Cathodic Arc

The current investigation observes the outcome of enhancing the surface properties by AlCrN monolayer coating using the cathodic arc plasma method on the Fe–Cu–C–Mo alloys. The compacts were sintered in spark plasma sintering (SPS) with the heat transfer rate of 100 °C/min at 1120 °C for 5 minutes. The Fe–2Cu–0.8C–0.6Mo sample has the highest relative sintered density (97.20%), hardness (96 HRB), and ultimate tensile strength (1000 MPa) compare with the other sintered compacts. AlCrN coating was deposited on Fe, Fe–2Cu, Fe–2Cu–0.8C, Fe–2Cu–0.8C–0.2Mo, Fe–2Cu–0.8C–0.4Mo, and Fe–2Cu–0.8C–0.6Mo samples, using the cathodic arc plasma–physical vapor deposition (CAP-PVD) process. The coated compact samples’ metallography images were examined using a Scanning Electron Microscope (SEM); the Fe–2Cu alloy sintered sample has obtained a uniform structure with high density and a smaller amount of corrosion penetration rate (0.6579 mmpy) as compared to the counterparts. The phase formed in the AlCrN coating was analyzed using the X-ray Diffraction (XRD). The Fe–2Cu–0.8C–0.6Mo coated compact sample exhibited higher hardness (1134.85 HV0.3) than the other coated compact samples. The Fe–2Cu–0.8C–0.2Mo coated compact sample has proven better corrosion resistance compared to the other coated compact sample.

Biomineralization of Titanium Alloy with Surface Micro - and Nanoscaled Modifications

2019 ◽  
Vol 813 ◽  
pp. 165-170
Author(s):  
Maria P. Nikolova ◽  
Stefan Valkov ◽  
Stoyan Parshorov ◽  
Emil Yankov ◽  
Peter Petrov
Keyword(s):  
Electron Beam ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Corrosion Current ◽  
Electrochemical Stability ◽  
Immersion Period ◽  
Initial Decrease ◽  
Static Conditions ◽  
Cathodic Arc ◽  
Deposition Techniques

The aim of the present study was to characterize two kinds of TiN/TiO2 coatings in terms of topography, composition, and electrochemical stability after immersion in simulated body fluid (SBF). Micropatterning of the substrate (Ti-5Al-4V alloy) was done by using electron beam modification (EBM) by scanning electron beam while nanostructured TiN/TiO2 films were deposited over EBM Ti5Al4V substrates using two physical vapor deposition techniques: 1) magnetron sputtering, and 2) cathodic arc and glow-discharge methods. When immersed for 7 and 14 days in SBF at static conditions (37±0.05 °C, pH 7.4), Ca/P ratio of the apatite deposits increased from approximately 1.5 up to near stoichiometric (1.67), respectively. After the initial decrease, the pH of the solution during soaking increased gradually reaching values close to 7.7 for both coatings. However, the weight gain of the samples with Arc coatings after the immersion period in SBF was nearly three times more than those with magnetron deposited coating. The electrochemical potentiodynamic tests performed in SBF indicated a shift in the corrosion potentials towards nobler direction after 7 and 14 days of immersion compared to non-immersed samples, whereas the corrosion current density was slightly increased.

Study on Two Plasma Physical Vapor Deposition Methods for Preparing Ultrafine Al Powders

2014 ◽  
Vol 556-562 ◽  
pp. 81-85
Author(s):  
Qiong Yu ◽  
Ming Li Li ◽  
Song Ji ◽  
Kun Ming Qian ◽  
Yu Song Zhou
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Direct Current ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Arc Plasma ◽  
Deposition Method ◽  
Micro Structure ◽  
Physical Vapor Deposition Method ◽  
Better Than

Plasma physical vapor deposition method was most widely used to prepare ultrafine Al powders. Direct Current Arc Plasma (DCAP) and Radio Frequency Induction Plasma (RFIP) were adopted individually to produce Al powders with different particle size. The micro structure such as grain size, morphology and crystal phase was examined by SEM, TEM and XRD methods. The results show that the Al production by RFIP was better than by DCAP. DCAP has outstanding advantages in producing nanoAl powders with the particle size below 300nm while the RFIP is better to produce Al powders with the particle size 300nm to 1 μm.

EFFECT OF COATING THICKNESS ON THE PROPERTIES OF TiN COATINGS DEPOSITED ON TOOL STEELS USING CATHODIC ARC PVD TECHNIQUE

2008 ◽  
Vol 15 (04) ◽  
pp. 401-410 ◽  
Author(s):  
A. MUBARAK ◽  
PARVEZ AKHTER ◽  
ESAH HAMZAH ◽  
MOHD RADZI HJ. MOHD TOFF ◽  
ISHTIAQ A. QAZI
Keyword(s):  
Surface Morphology ◽  
Tool Steel ◽  
Coating Thickness ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Testing Machine ◽  
High Speed Steel ◽  
Hard Coatings ◽  
Tool Steels ◽  
Cathodic Arc

Titanium nitride ( TiN ) widely used as hard coating material, was coated on tool steels, namely on high-speed steel (HSS) and D2 tool steel by physical vapor deposition method. The study concentrated on cathodic arc physical vapor deposition (CAPVD), a technique used for the deposition of hard coatings for tooling applications, and which has many advantages. The main drawback of this technique, however, is the formation of macrodroplets (MDs) during deposition, resulting in films with rougher morphology. Various standard characterization techniques and equipment, such as electron microscopy, atomic force microscopy, hardness testing machine, scratch tester, and pin-on-disc machine, were used to analyze and quantify the following properties and parameters: surface morphology, thickness, hardness, adhesion, and coefficient of friction (COF) of the deposited coatings. Surface morphology revealed that the MDs produced during the etching stage, protruded through the TiN film, resulting in film with deteriorated surface features. Both coating thickness and indentation loads influenced the hardness of the deposited coatings. The coatings deposited on HSS exhibit better adhesion compared to those on D2 tool steel. Standard deviation indicates that the coating deposited with thickness around 6.7 μm showed the most stable trend of COF versus sliding distance.

Bending Fatigue Behavior of 7075-Aluminum Alloy

2018 ◽  
Vol 774 ◽  
pp. 1-6 ◽  
Author(s):  
Emanuele Vincenzo Arcieri ◽  
Sergio Baragetti ◽  
Emanuele Borzini
Keyword(s):  
Aluminum Alloy ◽  
Tribological Properties ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Fatigue Behavior ◽  
The Other ◽  
7075 Aluminum Alloy ◽  
Bending Tests ◽  
Bending Fatigue ◽  
Light Components

Light alloys are a very interesting challenge in order to have light components with high mechanical features. One of these is the 7075 aluminum alloy, which is commonly employed in aeronautic, automotive and maritime fields.On the other hand, the application of a PVD (Physical Vapor Deposition) coating can improve the hardness of the surface and the tribological properties of the component.The effectiveness of these coatings on the fatigue behavior of the sublayer material is not already clear. For this reason, bending tests on uncoated and coated specimens in air were performed in order to evaluate the S-N diagrams

MACRODROPLET REDUCTION AND GROWTH MECHANISMS IN CATHODIC ARC PHYSICAL VAPOR DEPOSITION OF TiN FILMS

2008 ◽  
Vol 15 (05) ◽  
pp. 653-659 ◽  
Author(s):  
MUBARAK ALI ◽  
ESAH HAMZAH ◽  
TAHIR ABBAS ◽  
MOHD RADZI HJ. MOHD TOFF ◽  
ISHTIAQ A. QAZI
Keyword(s):  
Vapor Deposition ◽  
Metal Ion ◽  
Physical Vapor Deposition ◽  
High Speed ◽  
Gas Flow ◽  
High Speed Steel ◽  
Hard Coatings ◽  
Growth Mechanisms ◽  
Tin Coatings ◽  
Cathodic Arc

Cathodic arc physical vapor deposition (CAPVD) a technique used for the deposition of hard coatings for tooling applications has many advantages. The main drawback of this technique is the formation of macrodroplets (MDs) during deposition resulting in films with rougher morphology. The MDs contamination and growth mechanisms was investigated in TiN coatings over high-speed steel, as a function of metal ion etching, substrate bias, and nitrogen gas flow rate; it was observed that the latter is the most important factor in controlling the size and number of the macrodroplets.

scholarly journals Properties of Bare and Thin-Film-Covered GaN(0001) Surfaces

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 145
Author(s):  
Miłosz Grodzicki
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Surface Properties ◽  
Vapor Deposition ◽  
Direct Contact ◽  
Physical Vapor Deposition ◽  
Metal Films ◽  
Surface Alloying ◽  
X Ray ◽  
Physical Vapor Deposition Method

In this paper, the surface properties of bare and film-covered gallium nitride (GaN) in wurtzite form, (0001) oriented, are summarized. Thin films of several elements—manganese, nickel, palladium, arsenic, and antimony—were formed by the physical vapor deposition method. The results of the bare surfaces, as well as the thin film/GaN(0001) phase boundaries presented, were characterized by X-ray and ultraviolet photoelectron spectroscopies (XPS, UPS). Basic information on the electronic properties of GaN(0001) surfaces are shown. Different behaviors of the thin films, after postdeposition annealing in ultrahigh vacuum conditions such as surface alloying and subsurface dissolving and desorbing, were found. The metal films formed surface alloys with gallium (MnGa, NiGa, PdGa), while the semimetal (As, Sb) layers easily evaporate from the GaN(0001) surface. However, the layer in direct contact with the substrate could react with it, modifying the surface properties of GaN(0001).

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