TPT July 2008

H eat & S urface T reatments

Launch of new HVOF spray system for improved coating Metallisation, an expert in the technology of surface coatings, has launched the new Met-Jet 4L liquid fuel HVOF system, the latest development in its kerosene fuelled HVOF systems. The Met-Jet 4L has all of the features of the Met-Jet lll, and also boasts a number of enhancements and improvements. It is a mass flow controlled system, to ensure a repeatable coating, and produces the densest metallic and carbide coatings of all the Metallisation systems. The coatings can be compressively stressed, allowing thick layers to be applied without fear of spalling and with the new improvements. The result is a high quality, compact and easy to use HVOF system. The pistol combustion chamber has been modified to achieve cleaner burning and higher quality coatings, and the nozzle arrangement has been simplified to reduce the running costs of consumable spares. The powder feeder has mass flow

steel surface now proves to be completely passive and shows an essentially reduced inclination to adhesion of foreign matter (from a structural as well as energy point of view).  Example of tube incrustation on a tube plate: the two incrustation-free tubes are HE110 ® - electropolished test tubes

The practical results of HE110 ® - electropolishing and conditioning of stainless steel surfaces correspond to the expected theoretical consequences. There is an obvious relationship between the surface condition (level of energy and surface roughness), and the behaviour of the heat penetration value k during operating time and the formation of the coating. Because foreign matter coating can be avoided, layer growth is not expected, and in special cases only in very weak form. Tests have shown throughout that HE110 ® -electropolished stainless steel surfaces prevent, or at least strongly obstruct, the formation of coatings, and therefore enable the achievement of significant efficiency in production. Henkel Electropolishing Technology Ltd – Germany Fax : +49 387 57 66 353 E-mail : b.henkel@henkel-epol.com Website : www.henkel-epol.com

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J uly 2008

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