ECN publication
Koude plasmadepositie voor het aanbrengen van deklagen: een verkennende studie
Published by: Publication date:
ECN Environment & Energy Engineering 1-2-2000
ECN report number: Document type:
ECN-C--00-021 ECN publication
Number of pages: Full text:
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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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