Development of an Electric Arc Sprayed Self Lubricating Coating

1998 ◽  
Author(s):  
H. Llewellyn ◽  
P.S. Grant ◽  
A.P. Newbery ◽  
R.M. Jordan
Keyword(s):  
Deposition Rate ◽  
Grain Morphology ◽  
Industrial Applications ◽  
Drill String ◽  
Electric Arc ◽  
Spray Parameters ◽  
Analytical Treatment ◽  
Arc Spray ◽  
Powder Particles ◽  
Coating Temperature

Abstract Electric arc sprayed coatings with a disperse lubricating phase have potential for use in a variety of industrial applications as bearing materials including low friction coatings for drill string joints in the oil industry to reduce casing wear and lower drilling torque. This paper describes the optimisation of electric arc spray parameters for Fe-0.06wt.%C that will subsequently be used as a self-lubricating coating matrix. The effect of electric arc spray parameters on the microstructure of a Fe-0.06wt.%C matrix has been characterised in terms of deposition rate, temperature during manufacture, porosity and microhardness. It has been shown that the local coating temperature during directly affects the fmal coating porosity, grain size, grain morphology and microhardness. The most effective parameter in controlling coating temperature was the coating deposition rate. The Fe0.06wt.% C coating microstructure was primary equiaxed ferrite with a dispersion of spherodised Fe3C particles formed from the in-situ tempering of the as-sprayed martensite or bainite during spraying. A fuller analytical treatment of these phenomena is given elsewhere (13). Fe-0.06wt.%C powder particles microstructure was primarily bainitic or martensitic. A small number of Fe-0.06wt.%C powder particles showed a dendritic phase which has been proposed as retained austenite because of austenite stabilisation by fme grains and the N2 atmosphere, or an unidentified nitride layer.

Influence of Process Parameters and Geometry of the Spraying Nozzle on the Properties of Titanium Deposits Obtained in Wire Arc Spraying

2015 ◽  
Vol 1111 ◽  
pp. 211-216
Author(s):  
Bogdan Florin Toma ◽  
Iulian Ionita ◽  
Diana Antonia Gheorghiu ◽  
Lucian Eva ◽  
Costică Bejinariu ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Process Parameters ◽  
High Speed ◽  
Electrical Current ◽  
Electric Arc ◽  
Arc Spraying ◽  
Oxide Content ◽  
Spray Parameters ◽  
Influence Of Process Parameters ◽  
Wire Arc Spraying

Influence of the process parameters and geometry of the spraying nozzle on the properties of titanium deposits obtained in wire arc spraying. Wire arc spraying is a process in which through minor modifications of the spray parameters, they can have a major impact on the coatings properties. In this paper there is presented a study on the influence of process parameters and fluid dynamics of the atomization gas on the properties of titanium deposits (14T - 99.9% Ti). For this there were used three different frontal spraying nozzles, having different geometries, and were varied the spraying gas pressure and the electrical current on three levels. There were evaluated the particles velocity, coating density, chemical composition and characteristic interface between deposition and substrate. Obviously, the high speed of the atomization gas determinate the improving of all properties, but in the same time increased the oxide content in the layer. However, the oxidation can be drastically reduced if the melting and atomization of the wire droplets is produced at the point of formation of the electric arc, and the spraying jet is designed to constrain the electric arc. The assessment of deposits adherence allowed the observation of process parameters that contribute to its improvement.

Cored Wire Application Using Electric Arc Spray

1998 ◽  
Author(s):  
E.R. Sampson
Keyword(s):  
Trend Analysis ◽  
Thermal Spraying ◽  
Electric Arc ◽  
Cored Wire ◽  
Arc Spray ◽  
New Development ◽  
The Future ◽  
Cored Wires

Abstract The use of cored wires for thermal spraying is a relatively new development that is being rapidly utilized for arc spray in a wide variety of applications. This paper will discuss the existing applications and industries in which cored wire coatings are used. Additionally, this presentation will cover the effect cored wires have had on the use ofother types ofthermal spray equipment. The paper will close with a trend analysis that discusses the applications of the future.

The Electric Arc Spray Manufacture of Rapid Production Tooling: A Case Study

1998 ◽  
Author(s):  
A.P. Newbery ◽  
P.S. Grant ◽  
R.M. Jordan ◽  
A.D. Roche ◽  
T.C. Carr
Keyword(s):  
Injection Moulding ◽  
Low Cost ◽  
Spray Forming ◽  
Electric Arc ◽  
Internal Stresses ◽  
Forming Process ◽  
Polymer Injection ◽  
Spray Process ◽  
Arc Spray ◽  
The U.S

Abstract The manufacture of tooling using the electric arc spray process to spray steel directly onto a master pattern offers substantial reductions in the lead times required to make complex tooling for polymer injection moulding and other applications. The process of spray forming is fast, efficient, and low cost, and has been shown to be dimensionally accurate with proper control over the residual stresses that develop during spraying. Poor dimensional control because of high internal stresses in thick arc sprayed steel coatings is well known, but these problems can be avoided by the use of correct spraying conditions. This paper describes the STD SPRAYFORM process for the manufacture of tooling for the polymer injection moulding of a component for a leading company in the U.S. The steps in the spray forming process, both before and after spraying, are described. The spray forming route competed directly with a traditional method for toolmaking and considerably reduced the lead time from order to completion. The tooling produced by spray forming has been operating commercially in production in the U.S. and has to date produced in the region of half a million parts without appreciable wear. The incorporation of contoured cooling channels during spraying has enabled plastic injection moulding cycle times to be decreased by 15%.

An Evaluation of the Electric Arc Spray and (HPPS) Processes for the Manufacturing of High Power Plasma Spraying MCrAlY Coatings

2001 ◽  
Vol 10 (2) ◽  
pp. 352-358 ◽  
Author(s):  
D. Sacriste ◽  
N. Goubot ◽  
J. Dhers ◽  
M. Ducos ◽  
A. Vardelle
Keyword(s):  
Plasma Spraying ◽  
High Power ◽  
Electric Arc ◽  
Arc Spray ◽  
Mcraly Coatings

Tungsten Carbide-Cobalt Coatings for Industrial Applications

2000 ◽  
Author(s):  
M. Dorfman ◽  
J. DeFalco ◽  
J. Karthikeyan
Keyword(s):  
Surface Roughness ◽  
Wear Resistance ◽  
Tungsten Carbide ◽  
Gas Flow ◽  
Deposition Efficiency ◽  
Industrial Applications ◽  
Spray Parameters ◽  
Coating Characteristics ◽  
Steel Substrates

Abstract This paper compares the coating characteristics of two HVOF processes: air-cooled converging-nozzle Diamond Jet (DJ) spraying and Hybrid 2600 air/water-cooled converging/diverging technology. WC-Co coatings were deposited on steel substrates using different combinations of spray parameters, gas flow ratios, and cooling gas types. The coatings were then examined and tested to determine the extent to which microstructure, hardness, surface roughness, wear resistance, and deposition efficiency can be controlled. In addition to investigating process relationships, the paper also addresses the issues of practicality and cost.

Comparison of aluminum coatings deposited by flame spray and by electric arc spray

2007 ◽  
Vol 202 (1) ◽  
pp. 172-179 ◽  
Author(s):  
Regina M. H. Pombo Rodriguez ◽  
Ramon S.C. Paredes ◽  
Schereiner H. Wido ◽  
Alfredo Calixto
Keyword(s):  
Electric Arc ◽  
Flame Spray ◽  
Aluminum Coatings ◽  
Arc Spray

Characterisation of electric arc spray formed Ni superalloy IN718

2002 ◽  
Vol 326 (1) ◽  
pp. 79-91 ◽  
Author(s):  
Matthew K Hedges ◽  
A.P Newbery ◽  
P.S Grant
Keyword(s):  
Electric Arc ◽  
Arc Spray

Scientific, Technological, and Economic Aspects of Rapid Tooling by Electric Arc Spray Forming

2006 ◽  
Vol 15 (4) ◽  
pp. 796-801 ◽  
Author(s):  
P.S. Grant ◽  
S.R. Duncan ◽  
A. Roche ◽  
C.F. Johnson
Keyword(s):  
Spray Forming ◽  
Rapid Tooling ◽  
Electric Arc ◽  
Economic Aspects ◽  
Arc Spray
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