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A thermally activated paraffin-based actuator for gas-flow control in a satellite electrical propulsion system
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science.
2003 (English)In: Sensors and Actuators A-Physical, ISSN 0924-4247, Vol. 105, no 3, 237-246 p.Article in journal (Refereed) Published
Abstract [en]

Microstructured silicon devices consisting of three inflatable paraffin-filled, corrugated caddies suspended in springs to minimize thermal losses have been fabricated and evaluated with a valve application in mind. The large volume expansion associated with the thermally induced solid-to-liquid phase transition of paraffin is used to activate the caddies’ diaphragms. Theses components all with a thickness of 600 μm and a diameter of 39 mm, but with three different corrugations, have been fabricated with deep reactive etching (DRIE). Whereas the corrugated diaphragms could endure a deflection larger than 50 μm, only strokes of 15 μm on each side were attained when the components were activated. Together with the valve seats proposed, the investigated devices have a potential in electrical propulsion systems for satellites.

Place, publisher, year, edition, pages
2003. Vol. 105, no 3, 237-246 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-89916DOI: 10.1016/S0924-4247(03)00203-6OAI: oai:DiVA.org:uu-89916DiVA: diva2:161776
Available from: 2002-05-16 Created: 2002-05-16 Last updated: 2013-06-13
In thesis
1. Miniature Phase-Transistion Actuators
Open this publication in new window or tab >>Miniature Phase-Transistion Actuators
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Clearly, there is a need for simple, strong actuators capable of large strokes in miniaturized systems such as valves and optical shutters.

The basis for this work is the microstructure technology with processing techniques adopted from the integrated circuit industry. In many cases alternative techniques have been developed to obtain features not achievable with conventional silicon technology. Techniques to fabricate thermally activated phase transition actuators capable of large strokes, as well as strong, piezoceramic actuators, have been investigated

Multilayered piezoceramic actuators have been fabricated and used in a miniature linear motor. A technique to build freestanding, three-dimensional structures drop by drop using a micromachined ink jet head and a slurry of piezoceramic particles has been developed. Ion track technology was used to create narrow pores in polyimide. To make bimorph-like structures capable of large strokes, these pores were impregnated with paraffin- a material with a large volume expansion associated with its solid-to-liquid phase transition. Paraffin was used in a silicon thermal switch intended for a passive thermal control system, and in a device to be used as a valve in a gas regulation system. Finally, paraffin actuators for integration in thermoplastic microfluidic systems have been developed.

During the course of this work not only the importance of identifying the best materials for a given application has been addressed and acknowledged, but also that of finding a processing route on occasion far from the conventional one, and perhaps most important, that of anticipating the often surprising effects following from miniaturization.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2002. 28 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 728
Keyword
Materials science, Materialvetenskap
National Category
Materials Engineering
Research subject
Materials Science
Identifiers
urn:nbn:se:uu:diva-2138 (URN)91-554-5345-7 (ISBN)
Public defence
2002-06-06, Ångströmslaboratoriet 2002, Uppsala, 09:30
Opponent
Available from: 2002-05-16 Created: 2002-05-16Bibliographically approved

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Klintberg, LenaThornell, Greger

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