Publications Search Results

Now showing 1 - 10 of 21
  • Patent
    Elektromechanischer Wandler und Verfahren zur Herstellung
    ( 2003)
    Sporn, D.
    ;
    Watzka, W.
    ;
    Schoenecker, A.
    ;
    Seffner, L.
    Die Erfindung betrifft einen elektromechanischen Wandler, Verfahren zur Herstellung desselben sowie ein Verbundsystem, das den elektromechanischen Wandler enthaelt. Der erfindungsgemaesse elektromechanische Wandler besteht aus zumindest einer langgestreckten Faser aus einem piezoelektrischen Material. An voneinander beabstandeten Stellen der Faser sind zumindest zwei Elektroden vorgesehen, um die Faser mit einem elektrischen Feld zu beaufschlagen. Die Elektroden stehen hierbei mit der Faser in direktem Kontakt und umschliessen die Faser teilweise oder vollstaendig. Durch den direkten Kontakt zwischen Elektrode und Faser wird die optimale Einkopplung des elektrischen Feldes in die Faser ermoeglicht, so dass niedrigere elektrische Spannungen an den Elektroden ausreichen, um die Faser zu polarisieren. Ein weiterer Vorteil besteht darin, dass die Elektrode nicht nur an einem Punkt mit der Faser in direktem Kontakt steht, sondern ueber einen Teil des Umfangs der Faser. Hierdurch wird die Einkopplung des elektrischen Feldes weiter verbessert.
  • Publication
    Development and technology of doped sol-gel derived lead zirconate titanate fibers
    ( 2003)
    Helbig, J.
    ;
    Glaubitt, W.
    ;
    Spaniol, H.
    ;
    Vierhaus, P.
    ;
    Lange, U.
    ;
    Hansch, R.
    ;
    Watzka, W.
    ;
    Sporn, D.
    Piezoelectric PZT fibers were developed via the sol-gel route. These fibers are thin (about 30 mu m thick) and flexible and can be used for composites which can be adapted to curved geometries. A pilot plant scale synthesis of the thin piezoelectric fibers is presented. Commonly used sintering arrangements were adapted to the specific conditions of the new process. To reduce the processing time a new method for the pyrolysis of the organic precursor fibers was carried over from treatments of other ceramic systems. The sintering process was modified to cope with the unusually large size of the reaction room. The resulting microstructure is comparable to that of conventionally sintered ceramic material. Dielectric and electromechanical measurements show that the fibers fabricated by this new technology are of good quality.
  • Publication
    Properties of fine scale piezoelectric PZT fibers with different Zr content
    ( 2001)
    Steinhausen, R.
    ;
    Hauke, T.
    ;
    Beige, H.
    ;
    Watzka, W.
    ;
    Lange, U.
    ;
    Sporn, D.
    ;
    Gebhardt, S.
    ;
    Schönecker, A.
  • Patent
    Keramische und insbesondere piezoelektrische Mono- oder Multifilamentfasern und Verfahren zu deren Herstellung
    ( 2001)
    Scholz, H.
    ;
    Watzka, W.
    ;
    Vierhaus, P.
    Ceramic mono- or multi-filament fibres based on PbMO3 (where M = metallic element or a combination of different metallic elements, which can occupy the 'B' position of the perowskite lattice) are new and have a tensile strength of at least 100 MPa. Also claimed is the production of the fibres. ADVANTAGE - The fibres have good piezoelectric and ferroelectric properties.
  • Publication
    Smart structures with integrated piezoelectric thin fibers
    ( 2000)
    Sporn, D.
    ;
    Watzka, W.
    ;
    Schönecker, A.
    ;
    Pannkoke, K.
  • Publication
    High-performance piezoelectric thin fibers and sheets as functional components for smart materials
    ( 2000)
    Schönecker, A.
    ;
    Sporn, D.
    ;
    Watzka, W.
    ;
    Seffner, L.
    ;
    Pannkoke, K.
    ;
    Wierach, P.
  • Publication
    Smart structures by integrated piezoelectric thin fibres. Part 1: Preparation, properties and integration of fibers in the system Pb(Zr, Ti)O3
    ( 1999)
    Sporn, D.
    ;
    Watzka, W.
    ;
    Pannkoke, K.
    ;
    Schönecker, A.
    The integration and control of PZT fibers with tiny diameters into composite materials leads to a new type of material. Tiny PZT fibers can be aligned in an array, electrodized with interdigital electrodes and then integrated. Evidence of sensoric and actuatoric properties of integrated PZT fiber architectures has been presented. The results achieved so far are a basis to explore the potentials of such materials by optimizing the fiber composition, the structural design of composite materials and - last but not least - the 'intelligence' of the controller. The fiber development is not yet finished. The next necessary steps are the optimization of the chemical composition and the microstructure with respect to the mentioned applications and the further development of the fiber preparation technology. Soft PZT formulations are now under investigation and will be available in the near future. The fiber technology is still challenging. The authors' mid-term target is to develop and to establish a continuous process which can deliver larger quantities of fibers necessary for the development of components. At present the fibers are produced batchwise on a laboratory scale. The authors expect that 'intelligent' composite materials with integrated PZT fibers can trigger the production of a large number of new products.
  • Publication
    Finescaled piezoelectric 1-3 composites: properties and modeling
    ( 1999)
    Steinhausen, R.
    ;
    Hauke, T.
    ;
    Seifert, W.
    ;
    Beige, H.
    ;
    Watzka, W.
    ;
    Seifert, S.
    ;
    Sporn, D.
    ;
    Starke, S.
    ;
    Schönecker, A.
  • Publication
    Smart structures by integration of piezoelectric PZT fibers. Present state and future applications
    ( 1999)
    Sporn, D.
    ;
    Watzka, W.
    ;
    Schönecker, A.
    ;
    Pannkoke, K.
  • Publication
    Smart structures by integrated piezoelectric thin fibers. Part 2: Properties of composites and their physical description
    ( 1999)
    Schönecker, A.
    ;
    Keitel, U.
    ;
    Kreher, W.
    ;
    Sporn, D.
    ;
    Watzka, W.
    ;
    Pannkoke, K.
    The integration and control of PZT fibers with tiny diameters into composite materials leads to a new type of material. Tiny PZT fibers can be aligned in an array, electrodized with interdigital electrodes and then integrated. Evidence of sensoric and actuatoric properties of integrated PZT fiber architectures has been presented. The results achieved so far are a basis to explore the potentials of such materials by optimizing the fiber composition, the structural design of composite materials and - last but not least - the 'intelligence' of the controller. The fiber development is not yet finished. The next necessary steps are the optimization of the chemical composition and the microstructure with respect to the mentioned applications and the further development of the fiber preparation technology. Soft PZT formulations are now under investigation and will be available in the near future. The fiber technology is still challenging. The authors' mid-term target is to develop and to establish a continuous process which can deliver larger quantities of fibers necessary for the development of components. At present the fibers are produced batchwise on a laboratory scale. The authors expect that 'intelligent' composite materials with integrated PZT fibers can trigger the production of a large number of new products.