HIGH PERFORMANCE TEXTURED PIEZOELECTRIC CERAMICS AND METHOD FOR MANUFACTURING SAME
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United States of America Patent
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Oct 2, 2014
app pub date -
Oct 12, 2012
filing date -
Oct 12, 2011
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Abstract
A textured PMN-PZT ceramic is created using templated grain growth to align seed crystals in a ceramic matrix powder by tape-casting process. Heat treatment then results in the nucleation and growth of matrix crystals on aligned templates. The resulting textured PMN-PZT ceramic has high longitudinal piezoelectric coefficient and a high piezoelectric voltage coefficient. In another embodiment, a textured PMN-PT ceramic has a volume fraction of the templates no greater than 1%. The utility of this invention includes both its exceptional piezoelectric properties as well as the utilization of an economical manufacturing process that is widely used in the multi-layer ceramic capacitor industry.
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