Plasma-arc spray-coating of powders of self-fluxing iron-base alloys 1. Estimation of the temperature and velocity of powder particles in the plasma flow

1995 ◽  
Vol 34 (1-2) ◽  
pp. 31-35 ◽  
Author(s):  
A. A. Nechiporenko ◽  
E. P. Martsevoi
Keyword(s):  
Plasma Flow ◽  
Spray Coating ◽  
Plasma Arc ◽  
Iron Base ◽  
Arc Spray ◽  
Powder Particles

scholarly journals MODELING THE PROCESS OF SPHEROIDIZATION POWDER PARTICLES BY THE PLASMA-ARC METHOD

2021 ◽  
Vol 4 (2.2) ◽  
pp. 25-32
Author(s):  
А.Yu. ANDREYTSEV ◽  
I.V. SMYRNOV ◽  
A.V. CHORNYI ◽  
S.N. MINAKOV
Keyword(s):  
Plasma Arc ◽  
Powder Particles

Thermal Spray for Corrosion Control: A Competitive Edge for Commercial Shipbuilding

1995 ◽  
Vol 11 (01) ◽  
pp. 53-55
Author(s):  
Frank S. Rogers
Keyword(s):  
Thermal Spray ◽  
Marine Environment ◽  
Thermal Spraying ◽  
Spray Coating ◽  
Cost Effective ◽  
Thermal Spray Coating ◽  
Coating System ◽  
Protection Mechanism ◽  
Arc Spray ◽  
Spray System

Thermal spraying of steel with aluminum to protect it from corrosion is a technology that has been proven to work in the marine environment. The thermal spray coating system includes a paint sealer that is applied over the thermally sprayed aluminum; this extends the service life of the coating, and provides color to the end product. The thermal spray system protects steel both through the principle of isolation (as in painting) and galvanization (as in galvanizing). With this dual protection mechanism, steel is protected from corrosion even when the coating is damaged. The thermal sprayed aluminum coating system has proven to be the most cost-effective corrosion protection system for the marine environment. Until recently, however, the initial cost of application has limited its use for general application. Today a new arc spray technology has reduced the application cost of thermal spraying aluminum to below that of painting. Commercial shipbuilders could use this technology to enhance their market position in the marine industry.

Microstructure and mechanical properties of Co-based alloy coatings fabricated by laser cladding and plasma arc spray welding

2019 ◽  
Vol 785 ◽  
pp. 846-854 ◽  
Author(s):  
Jian Zhao ◽  
Qingwei Gao ◽  
Houqin Wang ◽  
Fengyuan Shu ◽  
Hongyun Zhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Laser Cladding ◽  
Plasma Arc ◽  
Arc Spray ◽  
Microstructure And Mechanical Properties

scholarly journals DC Arc Plasma Treatment for Defect Reduction in WC-Co Granulated Powder

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 975
Author(s):  
Hirotomo Itagaki ◽  
Taisei Yachi ◽  
Hisato Ogiso ◽  
Harumichi Sato ◽  
Yorihiro Yamashita ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Plasma Treatment ◽  
Spray Coating ◽  
Xrd Analysis ◽  
Arc Plasma ◽  
Defect Reduction ◽  
Spherical Powder ◽  
Powder Particles ◽  
Residual Strains ◽  
Dc Arc

Tungsten carbide–cobalt (WC–Co) agglomerated powder is widely used for additive manufacturing and spray coating, and a reduction in internal gaps in the powder is required to obtain a product of high quality. In this paper, we investigate plasma effects on agglomerated powder when WC–12%Co powder is directly subjected to direct current (DC) arc plasma treatment to reduce gaps in the WC–Co powder. We obtain a plasma-treated powder with reduced gaps among WC particles. Furthermore, plasma-treatment improves the sphericity of the powder particles, due to the spheroidization effect, so that the percentage of plasma-treated particles exceeding 95% sphericity is 50%, which is 1.7 times that of raw powder. Concern regarding the possible generation of W2C by plasma treatment is unfounded, with W2C levels kept very low according to X-ray diffraction (XRD) analysis, showing a value of 0.0075 for the area ratio W2C(002)/WC(100). XRD analysis also reveals that plasma treatment relaxes residual strains in the powder. From these results, the DC plasma treatment of WC agglomerated powder produces a spherical powder with fewer gaps and strains in the powder, making it more suitable for additive manufacturing while suppressing decarburization.

MECHANICAL PROPERTIES OF THERMAL ARC SPRAY ALUMINIUM COATING IN ATMOSPHERIC CONDITION

2015 ◽  
Vol 76 (10) ◽  
Author(s):  
Muhamad Hafiz Abd Malek ◽  
Nor Hayati Saad ◽  
Sunhaji Kiyai Abas ◽  
Noriyati Mohd Shah
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Corrosion Rate ◽  
Coating Thickness ◽  
Salt Spray ◽  
Atmospheric Condition ◽  
Spray Coating ◽  
Image Analyzer ◽  
Arc Spray ◽  
Two Samples

Thermal arc spray coating was regard as most preferred method as a protective coating due to its ability to sustain in high temperature, high friction surface, and low cost process. It has been applied by most of industrialist especially in oil and gas field, where current application of the coating used in onshore. This research is a study on mechanical properties of thermal arc spray coating by using aluminium alloy with purity 99.5% as coating material. Two samples with different coating thickness at range of 200 μm – 300 μm and 300 μm – 400 μm were used for this research. Some of tests were prepared to evaluate coating mechanical properties. Surface microstructures were viewed and analysed using scanning electron microscope and energy dispersive x-ray analysis.  The hardness was inspected using Vickers Hardness testing. Corrosion rate was established by performing Salt Spray Test. Porosity value was calculated using Image Analyzer. Surface roughness was viewed using Infinitefocus G4 machine. Experimental results were found that coating porosity was raising with enhancing of coating thickness. The increment coating thickness also resulted in reduction of hardness and surface roughness. For corrosion rate purpose, two samples with coating thickness at range of 200 μm – 300 μm and two samples with coating thickness at range 300 μm – 400 μm were prepared. It recorded at Rating 5 – Rating 7 after exposed in salt spray cabinet within 144 hours. As a result, coating thickness at range of 200 μm – 300 μm performs the most efficiency in terms of mechanical properties; less corrosion rate, less porosity and contribute to high hardness and surface roughness.  

scholarly journals The influence of powder feed rate on mechanical properties of atmospheric plasma spray (APS) Al-12Si coating

2019 ◽  
Vol 58 (1) ◽  
pp. 75-81
Author(s):  
Mihailo Mrdak ◽  
Bojan Medjo ◽  
Darko Veljić ◽  
Miodrag Arsić ◽  
Marko Rakin
Keyword(s):  
Mechanical Properties ◽  
Plasma Spray ◽  
Spray Coating ◽  
Fracture Morphology ◽  
Optical Microscope ◽  
Atmospheric Plasma Spray ◽  
Atmospheric Plasma ◽  
Powder Feed ◽  
Feed Control ◽  
Powder Particles

Abstract In this paper, structural and mechanical properties of APS - atmospheric plasma spray coating Al-12Si are presented. The aim of the research was the optimisation of the flow of powder to produce layers with optimal mechanical and structural properties that will be applied to the worn out parts of airplanes. Three groups of samples were produced, by utilising three powder feed rates: 30 g/min, 45 g/min and 60 g/min. Evaluation of layers’ microhardness was done using HV0.3 method and the bond strengthwas determined by testing of tensile strength. Surface morphology of the deposited powder particles was examined on SEM (Scanning Electron Microscope). The microstructure of the coating with the best measured mechanical properties was subsequently examined in etched condition on optical microscope and SEM (in accordance with the standard PN 585005, Pratt & Whitney). Also, fracture morphology of this coating in deposited state was examined using SEM. It was found that powder feed control with atmospheric plasma spraying can produce dense layers of Al-12Si coating with good bond strength.

Active electronic devices fabricated by DC plasma arc spray process

Vacuum ◽  
2000 ◽  
Vol 59 (1) ◽  
pp. 179-184 ◽  
Author(s):  
H.C. Dickey ◽  
T.T. Meek
Keyword(s):  
Electronic Devices ◽  
Plasma Arc ◽  
Dc Plasma ◽  
Spray Process ◽  
Arc Spray
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