Die Untersuchung des Agglomerationsverhaltens von nanoskaligen Partikeln in Abhängigkeit der Konzentration der Einzelbestandteile eines Watts-Nickelelektrolyten und der mechanischen Konvektion ist Gegenstand dieses Artikels. Ausgehend von der Beschreibung der Messprinzipien werden die Ergebnisse der Zetapotentialmessungen und Bestimmung der Agglomeratgrößen dargestellt, wobei ebenfalls auf die auftretenden Schwierigkeiten bei den Messungen eingegangen wird. Nickelsulfat zeigte die größte Wirkung zur Bildung großer Agglomerate während die Borsäure darauf keinen Einfluss aufwies.Schlagworte: Nanopartikel, Nickelelektrolyt, Dispergierung, Zetapotential, AgglomeratgrößeThe analysis of the agglomeration behaviour of nano-scaled particles as a function of concentration of the single constituents of the Watts-Nickel-Electrolyte and the mechanic convection is topic of this article. Beginning with the description of the measuring principles, the article demonstrates the results of zetapotential measurements and size measurements, and goes into the occurring measurement problems. Nickel sulphate lead to heavy agglomeration, boric acid in contrast did not show any influence on particle size.
Diese Arbeit berichtet über die Ergebnisse der elektrochemischen Abscheidung von Nickeldispersionsschichten mit nanoskaligen Partikeln aus einem Watts Elektrolyten. Es werden Aussagen zu erzielten Einbauraten und daraus resultierenden Gefügen und mechanischen Eigenschaften getroffen. Von besonderer Bedeutung für die Anwendung der abgeschiedenen Schichten sind deren Korrosions-und Verschleißverhalten. Mit Hilfe von Stromdichte-Potenzialmessungen und optischen Untersuchungsmethoden ist das Korrosionsverhalten in Abhängigkeit von den Feststoffen und organischen Zusätzen bewertbar. Eine Steigerung der Korrosionsbeständigkeit durch nanoskalige Teilchen wurde nicht festgestellt. Sehr positiv wirken sich die inkorporierten Partikel auf das Verschleißverhalten, ermittelt im Schwingverschleißtribometer, aus.Schlagworte: Elektrochemische Abscheidung, Dispersionsschichten, Nanopartikel, Korrosion, VerschleißThe present study describes the results of the electrochemical deposition of Nickel dispersion coatings from a Watts electrolyte with nano-scaled particles. Subsequently, the incorporated particles lead to different microstructures and have impact on the mechanical properties. The corrosion and wear behaviour of these layers are of high interest regarding their applications. By means of potentiodynamic measurements and optical characterisation, the corrosion behaviour can by evaluated in correlation to the applied particles and additives. Unfortunately, an improvement of corrosion protection could not be measured. From investigations by means of oscillation tribometer, it can be shown that the incorporated particles improve the wear behaviour.
The application of glass in the microsystems technology becomes more and more important. Therefore, it is necessary to combine special microstructurable glasses with various other materials (e.g. joining with silicon by anodic bonding, joining with metals by electroforming, joining with polymers by glueing, joining with various other glasses by brazing or diffusion welding).In order to increase the use of glass in the microsystems technology especially four fields of research are important:-development of special glasses with various properties -technologies of microstructuring -technologies of joining -application These four topics are main research fields performed at the Institute of Glass/Ceramics-Technology and will be described in this paper.
Layers of metals and alloys deposited in microstructures usually require to be thicker than the 100 lm which is the approximate height of the structure. The deposited form of noble metals used in microsystems must be non-stressed, ductile and free of cracks and pores. As the thickness of layers deposited from commercial noble metal electrolytes will rarely exceed 10 lm without loss of quality, developing an electrolyte system suitable for microsystems involves finding appropriate additives and deposition parameters. Details are given of deposit characterisation, the parameters of the deposition technology and some practical examples. Initial results are presented and discussed.
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