Process for producing piezoelectric ceramics
AssigneeMurata Manufacturing Co., Ltd.
InventorsMasahiko Kimura, Akira Ando
Life of this patent
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Abstract
A ceramic composition (sample) includes CaBi4Ti4O15 or another compound having a layered perovskite crystal structures and exhibiting ferroelectricity at ordinary temperature. The ceramic composition (sample) is then heated to a temperature higher than the melting point of the ceramic composition to make the ceramic composition molten or semi-molten. The ceramic composition is then annealed and solidified to yield a grain oriented ceramic (porcelain). This process can produce grain oriented ceramics from ceramic compositions mainly containing a compound having a layered perovskite crystal structure, and can improve electromechanical coefficients of piezoelectric ceramics containing a compound having a layered perovskite crystal structure.
Claims12
A process for producing a grain oriented piezoelectric ceramic comprising:
- providing a powdered ceramic composition having a melting point,
- molding the powdered ceramic composition,
- heating the molded ceramic composition at a temperature higher than the melting point of said ceramic composition so as to make said ceramic composition molten or semi-molten, said heated ceramic composition comprising a compound having a layered perovskite crystal structure and exhibiting ferroelectricity at ambient temperature, and
- annealing and solidifying said molten or semi-molten ceramic composition to form a grain oriented piezoelectric ceramic.
Dependencies are inferred from the claim text.