Making large porous aggregates

Details Making large porous aggregates Making large porous aggregates

1997-01-23

2000-02-08

Talbot, Brian K.

Coating processes

Electrical product produced

Piezoelectric properties

29 2535, 310311, B05D 512

Patent

active

06022584&

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: 3977547 (1976-08-01), Giniewicz et al.
patent: 4227111 (1980-10-01), Cross et al.
patent: 4330593 (1982-05-01), Shrout et al.
patent: 4624796 (1986-11-01), Giniewicz et al.
patent: 4726099 (1988-02-01), Card et al.
patent: 4728845 (1988-03-01), Haun et al.
patent: 5043622 (1991-08-01), Sagong et al.

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