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Thermal spraying techniques are coating processes in which melted (or heated) materials are sprayed onto a surface. The "feedstock" (coating precursor) is heated by electrical (plasma or arc) or chemical means (combustion flame).Coating quality is usually assessed by measuring its porosity, oxide content, macro and micro-hardness, bond strength and surface roughness. Generally, the coating quality increases with increasing particle velocities.
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Scope and Importance
Thermal spray coating technologies are highly versatile, allowing engineering of an almost a limitless number of coatings for an extremely wide range of applications - just a few of which include, protecting jet engine components from high temperatures and oxidation, medical devices such as surgical instruments and orthopedic implants, enhancing wear resistance for agricultural components, and providing electrical insulation or conductivity for electronic devices. Thermal spraying techniques are coating processes in which melted (or heated) materials are sprayed onto a surface. The "feedstock" (coating precursor) is heated by electrical (plasma or arc) or chemical means (combustion flame).
Thermal spraying can provide thick coatings (approx. thickness range is 20 micrometers to several mm, depending on the process and feedstock), over a large area at high deposition rate as compared to other coating processes such as electroplating, physical and chemical. Coating materials available for thermal spraying include metals, alloys, ceramics, plastics and composites. They are fed in powder or wire form, heated to a molten or semi molten state and accelerated towards substrates in the form of micrometer-size particles. Combustion or electrical arc discharge is usually used as the source of energy for thermal spraying. Resulting coatings are made by the accumulation of numerous sprayed particles. The surface may not heat up significantly, allowing the coating of flammable substances.
Detonation thermal spray process: Detonation gun consists of a long water-cooled barrel with inlet valves for gases and powder. Oxygen and fuel (acetylene most common) is fed into the barrel along with a charge of powder. A spark is used to ignite the gas mixture and the resulting detonation heats and accelerates the powder to supersonic velocity through the barrel. A pulse of nitrogen is used to purge the barrel after each detonation. This process is repeated many times a second. The high kinetic energy of the hot powder particles on impact with the substrate results in a buildup of a very dense and strong coating.
In the 1990s, cold spraying (often called gas dynamic cold spray) was introduced. The method was originally developed in Russia with the accidental observation of the rapid formation of coatings, while experimenting with the particle erosion of the target exposed to a high velocity flow loaded with fine powder in a wind tunnel. In cold spraying, particles are accelerated to very high speeds by the carrier gas forced through a converging–diverging de Laval type nozzle. Upon impact, solid particles with sufficient kinetic energy deform plastically and bond mechanically to the substrate to form a coating.Market Analysis:
Analysts forecast the Global Thermal Spray market to grow at a CAGR of 8.13 percent over the period 2014-2019.
Symposium and Workshop
1.Quantum Physics and Nuclear Engineering,
March 14-16, 2016 London, UK.
2.Conference on Physics,
June 27-29, 2016 New Orleans, USA.
3.Annual Astronomy and Astrophysics Congress,
August 8-9, 2016 Las Vegas, USA.
4.Mesoscopic and Condensed Matter Physics
October 27-29, 2016 Chicago, USA.
5.Medical Physics and Biophysics,
November 3-5, 2016 Istanbul, Turkey.
6.Atomic and Nuclear Physics,
November 17-19, 2016 Atlanta, USA.
7.SHC 2015, the International Conference on Solar Heating and Cooling for Buildings and Industry,
December 2nd, 2015, Istanbul, Turkey.
8.International conference on energy systems Istanbul,
December 23rd, 2015 - ICES2015 Istanbul, Turkey.
9.2016 3rd International Conference on Geological and Civil Engineering (ICGCE 2016),
January 12th, 2016, Penang, Malaysia.
10.International Conference on Trends in Industrial and Mechanical Engineering (IC TIME 2016),
February 4th, 2016, Bhopal, India.
11.South-East European Congress on Energy Efficiency and Renewable Energy,
April 5th, 2016, Sofia, Bulgaria.
12.EurAsia Waste Management Symposium,
May 2nd, 2016, Istanbul, Turkey.
13.Heat Transfer 2016,
7th, 2016 Ancona, Italy
List of Societies and Associations
1.International Thermal Spray Association
2.European Thermal Spray Association
3.Japan Thermal Spray Society
4.Thermal Spray Society
List of Companies
1.FST Global Thermal Spray Company
2.Thermal Spray Technologies
This page will be updated regularly.
This page was last updated on 12th Sep, 2015
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