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Title:
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Koude plasmadepositie voor het aanbrengen van deklagen: een verkennende studie
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Author(s):
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Published by:
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Publication date:
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ECN
Environment & Energy Engineering
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1-2-2000
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ECN report number:
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Document type:
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ECN-C--00-021
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ECN publication
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Number of pages:
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Full text:
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29
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Download PDF
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Abstract:
Within a project, subsidised by Novem (Netherlands Agency for Energy andthe Environment), in which the possibilities of cold plasma deposited
coatings are studied, research has been carried out on a coated aluminum test
block with holes of different sizes and shapes. The aim was to find other
applications, particularly energy-related applications, than those for which
the technique was initially developed in the Russian Federation. The first
tests looked primarily at the application for the internal coating of cooling
channels in metal components. For the study, an aluminum test block with
holes was coated at the Russian Academy of Science in Tomsk, Russian
Federation. After coating, the block was destructively tested at ECN, where
in the first place the quality (coating thickness, adherence, porosity,
composition) was examined. If the quality was sound, corrosion and wear tests
were carried out. Otherwise improvement of the quality of the coating would
be sought in consultation with the Russian partner. From the study it
appeared that the coating quality is strongly influenced by the shape of the
holes. If well accessible for the electrolyte, then well-adhering coatings up
to a thickness of 50 mum are applied. By hole diameters of 5mm, it was
possible to apply a coating over the full length of the test block, 50 mm. In
continuous holes, it appears that with hole diameters of less than 5 mm, no
useful coatings can be applied deeper than 8 mm. In blind holes it proved
impossible to apply useful coatings in holes with diameters of less than 12
mm. The thin coatings were furthermore very porous, appeared brittle, and
adhered poorly to the aluminum substrate. These results were the motivation
not to carry out the corrosion and wear tests. Instead, a course of process
optimization was taken. An improvement in quality can probably be realized by
using internal electrodes and forcing the flow of the electrolyte. However,
this will probably not be effective for hole diameters of less than 2 mm. By
use of an internal electrode there will be too little volume left for the
electrolyte. During the attempts to optimize the process, communication and
financial problems with the Russian partner arose. After several attempts it
was therefore decided to stop the work on cold plasma deposition and to end
the cooperation. 2 refs.
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