Next-generation electroceramic fibers for active control

Pavel Bystricky; Marina R. Pascucci; Harold B. Strock

doi:10.1117/12.474971

11 July 2002 Next-generation electroceramic fibers for active control

Pavel Bystricky, Marina R. Pascucci, Harold B. Strock

Proceedings Volume 4699, Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics; (2002) https://doi.org/10.1117/12.474971
Event: SPIE's 9th Annual International Symposium on Smart Structures and Materials, 2002, San Diego, California, United States

Abstract

Lead-based PMN-31PT and lead-free BNBZT fibers in the 250- 500 micrometer diameter range were produced using CeraNova's proprietary extrusion technology. Various recrystallization approaches were investigated, including seeded solid state conversion and self-seeded texturing, with the goal of obtaining single-crystalline or textured macrocrystalline fibers. Grains in excess of 100 micrometers - and exceeding 1 mm in some cases - with surface and bulk coverage approaching 100 percent, were obtained in a narrow temperature range and under carefully controlled atmosphere conditions. Large grain growth in BNBZT required the presence of BaSrTiO₃ or SrTiO₃ seeds and temperatures in the 1150-1200 degrees C range. In PMN-31PT, nearly compete recrystalline was observed in unseeded material at relatively low temperature and short time, and improved performance was achieved with a two-step sintering schedule and slightly extended time. While conduction effects have not yet allowed compete assessment of recrystalline BNBZT, PMN-31PT fibers have shown excellent piezoelectric properties with remanent polarization in excess of 30(mu) C/cm² and coercive field of 4.5kV/cm. When incorporated into active fiber composites, the latter fibers' performance of 2000 microstrain in superior to average PZT-based production composites. Efforts are under way to induce preferred orientation in the large crystal in order to maximize performance.

Citation Download Citation

Pavel Bystricky, Marina R. Pascucci, and Harold B. Strock "Next-generation electroceramic fibers for active control", Proc. SPIE 4699, Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics, (11 July 2002); https://doi.org/10.1117/12.474971

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