Ksenija Milićević NeumannElectrolytic anodic dissolution of Ti, Al and V in LiCl - KCl(eut) based molten salts | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
ISBN: | 978-3-8440-8165-7 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Series: | Schriftenreihe des IME Herausgeber: Prof. Dr.-Ing. Bernd Friedrich Aachen | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Volume: | 75 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Keywords: | Titanium; aluminium; vanadium; molten salt electrolysis; titanium matrix composites | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Type of publication: | Thesis | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Language: | English | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Pages: | 156 pages | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Figures: | 79 figures | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Weight: | 231 g | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Format: | 21 x 14,8 cm | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Binding: | Paperback | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Price: | 48,80 € / 61,10 SFr | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Published: | August 2021 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Buy: | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
DOI: | 10.2370/9783844081657 (Online document) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Download: | Available PDF-Files for this title: You need the Adobe Reader, to open the files. Here you get help and information, for the download. These files are not printable.
User settings for registered users You can change your address here or download your paid documents again.
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Recommendation: | You want to recommend this title? | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Review copy: | Here you can order a review copy. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Link: | You want to link this page? Click here. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Export citations: |
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Abstract: | Utilization of titanium matrix composites is limited due to their high production costs even though they exhibit exceptional mechanical properties and light weight suitable for aerospace applications. Matrix-coated-fibre (MCF) is currently the best production method in terms of product quality and volume. It employs magnetron sputtering as coating process of single fibres that accounts for two-thirds of the total costs. A possible innovative route for this step is using electrolytical deposition of Ti-6Al-4V alloy on SiC fibres that would reduce the production costs significantly. This thesis illustrates the investigation of the electrochemical behaviour of Ti-, Al- and V anodes and the possibility of their ions with low valence to be brought into an eutectic mixture of LiCl –KCl by anodic polarization. Furthermore soluble metallic anodes were used for their beneficial environmental impact compared to inert anode, preventing chlorine evolution. Generally speaking, the dissolution is possible, but these processes were followed by concurrent and parasitic reactions, formations of passivating layers and complexes, evaporation, grain detachment and strong corrosion all leading to reduced current efficiencies and or control difficulties. Those findings confirm complexity of multicomponent systems, especially those dealing with elements having multiple valences. Even with those challenges an electrolytic fibre coating process has the potential to be more profitable than state-of-the-art process (MCF method). These economical benefits can be further increased, since it has been shown that the dissolution can be improved by changing the anode morphology. Der Einsatz von Titan-Matrix-Verbundwerkstoffen ist aufgrund ihrer hohen Herstellungskosten begrenzt, obwohl sie außergewöhnliche mechanische Eigenschaften und ein geringes Gewicht aufweisen, die sich für Luft- und Raumfahrtanwendungen eignen. Einzelfaserbeschichtungskonzepte (engl. MCF) sind derzeit die beste Produktionsmethode in Bezug auf Produktqualität und Volumen. Es verwendet Magnetron-Sputtering als Beschichtungsprozess von Einzelfasern, der zwei Drittel der Gesamtkosten ausmacht. Ein möglicher innovativer Weg für diesen Schritt ist die elektrolytische Abscheidung einer Ti-6Al-4V-Legierung auf SiC Fasern, die die Produktionskosten deutlich reduzieren würde. Diese Arbeit zeigt die Untersuchung des elektrochemischen Verhaltens von Ti-, Al- und V-Anoden und die Möglichkeit, deren Ionen mit niedriger Wertigkeit in ein eutektisches Gemisch aus LiCl –KCl durch anodische Polarisation einzubringen. Es wurden lösliche metallische Anoden verwendet, da sie im Vergleich zu inerten Anoden Umweltfreundlicher sind und die Chlorentwicklung verhindern. Im Allgemeinen ist die Auflösung möglich, aber diese Prozesse wurden von konkurrierenden und parasitären Reaktionen, Bildung von passivierenden Schichten und Komplexen, Verdampfung und Kornablösung sowie starker Korrosion, die alle zu reduzierten Stromausbeuten und/oder Kontrollschwierigkeiten führen. Selbst mit diesen Herausforderungen hat ein elektrolytischer Faserbeschichtungsprozess das Potenzial, wirtschaftlicher zu sein als der Stand der Technik (MCF-Verfahren). Diese wirtschaftlichen Vorteile können weiter gesteigert werden, da gezeigt wurde, dass die Auflösung durch Veränderung der Anodenmorphologie verbessert werden kann. |