Coating processes – Electrical product produced – Piezoelectric properties
Patent
1997-03-26
1999-02-23
Tsang, Cecilia J.
Coating processes
Electrical product produced
Piezoelectric properties
428407, 264 63, 264 43, 252 629, 29 2535, 310358, B05D 512, B32B 516, H01L 4104, H04R 1700
Patent
active
058741267
ABSTRACT:
The process for making a porous mass containing dense aggregates or granu includes the steps of mixing powder with more than 10% by weight of a binder to form agglomerated powder, heating the agglomerated powder to remove the binder and to grow crystallites in the powder to an average diameter exceeding 5 microns to form a porous mass containing the dense aggregates, and cooling the porous mass. The porous mass is broken up, if it is cohesive, into the aggregates containing the crystallites and the aggregates can be used to make an article, such as a transducer. The transducer is essentially a thick film and its thickness is that of the ceramic aggregates of granules. The electrodes connect to the top and to the bottom of the aggragates. As a result, the transducer material operates in the 1-3 mode.
REFERENCES:
patent: 4707311 (1987-11-01), Okazaki
patent: 4902459 (1990-02-01), Matsubara et al.
patent: 5340510 (1994-08-01), Bowen
Chase Mark
Kahn Manfred
Kap George A.
Marshall Sandra
McDonnell Thomas E.
The United States of America as represented by the Secretary of
Tsang Cecilia J.
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