TPT July 2008

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July 2008 86 ›
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
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:
Website:
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
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