Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2005-06-07
2005-06-07
Dougherty, Thomas M. (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
Reexamination Certificate
active
06903495
ABSTRACT:
A piezoelectric material includes a polycrystalline piezoelectric compound having a component composition defined as Sr2-xCaxNaNb5O15, where x=0.05 to 0.35, and at least one rare earth oxide compound selected from the group consisting of Y2O3, La2O3, Dy2O3, Nd2O3, Yb2O3, Sm2O3, Er2O3, Gd2O3and Pr6O11to be added to the piezoelectric compound by 0.5 to 3.0 wt %. Moreover, a method of manufacturing the piezoelectric material includes blending ceramic materials, synthesizing, milling, pressing and sintering processes. In the synthesizing process, calcining is conducted at a temperature in a range from 1,050° C. to 1,150° C. for 2 to 12 hours in the atmosphere. And the sintering process includes first firing at temperature in a range from 1,180° C. to 1,270° C. for 4 to 8 hours in the atmosphere, and second firing at a temperature in a range from 1,370° C. to 1,400° C. for 10 to 75 hours in the atmosphere.
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Akimune Yoshio
Munakata Fumio
Shinohara Mikiya
Addison Karen
Dougherty Thomas M.
Foley & Lardner LLP
Nissan Motor Co,. Ltd.
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