Making Aggregates and Articles Made Therefrom
Patent, Filed 26 Mar 97, patented 23 Feb 99
DEPARTMENT OF THE NAVY WASHINGTON DC
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The process for making a porous mass containing dense aggregates or granules 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 aggregates. As a result, the transducer material operates in the 1-3 mode.
- Ceramics, Refractories and Glass