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US 5,308,807 AGranted
Production of lead zirconate titanates using zirconia sol as a reactant
AssigneeNalco Chemical Company
InventorsKevin J. Moeggenborg, Stephen A. Matchett
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Abstract
The invention provides a method for producing a lead zirconate-lead titanate ceramic material (PZT ceramic) that exhibits higher fired density than conventional PZT ceramics and approximately equal electrical properties. The method employs zirconium oxide sol, containing extremely small zirconium oxide particles, as a raw material.
Claims7
A method of manufacturing a lead zirconate titanate ceramic, which comprises:
- blending an aqueous zirconium oxide sol which contains zirconium oxide particles having an effective diameter smaller than about 90 nanometers with finely divided lead oxide and titanium oxide to create a slurry;
- heating the slurry with constant stirring until sufficient water is evaporated from the slurry to produce a relatively viscous paste;
- and
- drying and calcining the paste to produce a substantially homogeneous ceramic material.
1 more element
Dependencies are inferred from the claim text.