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Institution

DECHEMA

NonprofitFrankfurt am Main, Germany
About: DECHEMA is a nonprofit organization based out in Frankfurt am Main, Germany. It is known for research contribution in the topics: Corrosion & Oxide. The organization has 756 authors who have published 1307 publications receiving 25693 citations.
Topics: Corrosion, Oxide, Coating, Alloy, Catalysis


Papers
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Journal ArticleDOI
01 Mar 2016
TL;DR: In this article, an industrial used die cast alloys EN AC-48000 (AlSi12CuNiMg) and AZ80 (MgAl8Zn) were joined by a machining center modified especially for Ultrasound Supported Friction Stir Welding.
Abstract: Due to the steadily increasing demand on innovative manufacturing processes, modern lightweight construction concepts become more and more important. Especially joints of dissimilar metals offer a variety of advantages due to their high potential for lightweight construction. The focus of the investigations was Al/Mg-joints. Friction Stir Welding (FSW) is an efficient process to realize high strength joints between these materials in ductile condition. Furthermore, for a simultaneous transmission of power ultrasound during the FSW-process (US-FSW) a positive effect on the achievable tensile strength of the Al/Mg-joints was proven. In the present work the industrial used die cast alloys EN AC-48000 (AlSi12CuNiMg) and AZ80 (MgAl8Zn) were joined by a machining center modified especially for Ultrasound Supported Friction Stir Welding. The appearing welding zone and the formation of intermetallic phases under the influence of power ultrasound were examined in particular. In order to identify optimal process parameters extensive preliminary process analyzes have been carried out. Following this, an ultrasound-induced more intensive stirring of the joining zone and as a result of this a considerably modified intermetallic zone was detected. At the same time an increase of the tensile strength of about 25% for US-FSW-joints and for fatigue an up to three times higher number of cycles to failure in comparison to a conventional welding process was observed. Moreover, detailed corrosion analyzes have shown that especially the welding zone was influenced by the corrosive attack. To expand and deepen the knowledge of the US-FSW-process further material combinations such as Ti/Steel and Al/Steel will be considered in future.

3 citations

Proceedings ArticleDOI
23 Aug 2021
TL;DR: In this paper, the authors discuss some major obstacles and solutions towards an industrialization of optical fiber sensors for cell state monitoring of lithium-ion batteries and present measurement results based on transmitted light intensities through the optical fiber as indicator for the state of charge.
Abstract: In this paper, we discuss some major obstacles and solutions towards an industrialization of optical fiber sensors for cell state monitoring of lithium-ion batteries. We present measurement results based on transmitted light intensities through the optical fiber as indicator for the state of charge. Cells are built with commercial electrodes in a pouch cell setup. To compensate for cross influences and stabilize the measuring signal against manufacturing tolerances, a referencing method is introduced. Thus, ratios of transmitted light intensities at different wavelengths are evaluated to avoid the use of absolute values. The obtained transmission ratios are in good agreement with the state of charge for various C-rates. Finally, possibilities towards an industrial implementation with inexpensive LEDs and phototransistors are discussed.

3 citations

Patent
Schuetze Michael Dr-Ing1
07 Apr 1999
TL;DR: An alloy of aluminum and titanium is used as a high temperature corrosion resistant coating material of heat resistant steels in installations with process gases which have a very low partial pressure of oxygen and, as consequence of carbon compounds in their composition, possess a high carbon activity.
Abstract: An alloy of aluminum and titanium is used as a high temperature corrosion resistant coating material of heat resistant steels in installations with process gases which have a very low partial pressure of oxygen and, as consequence of carbon compounds in their composition, possess a high carbon activity. The claimed coating material has an atomic aluminum content amounts to 22-56 %.

3 citations


Authors

Showing all 760 results

NameH-indexPapersCitations
Wolf B. Frommer10534530918
Michael W. Anderson10180863603
João Rocha93152149472
Martin Muhler7760625850
Michael Hunger6029511370
Ivars Neretnieks442247159
Michael Schütze403436311
Jens Schrader381294239
Roland Dittmeyer312063762
Lei Li291984003
Dirk Holtmann291073033
Lasse Greiner26741994
Klaus-Michael Mangold23571590
A. Rahmel23591967
Gerhard Kreysa22781305
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20231
20227
202145
202053
201949
201844