Low temperature densification of PZT ceramics
AssigneeUniversity of Illinois Foundation
InventorsRelva C. Buchanan, Dale E. Wittmer
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Abstract
Addition of from about 0.1 to about 6.0% by weight of V.sub.2 O.sub.5 to (PZT)lead zirconate-lead titanate powder promotes rapid densification at temperatures below 1000.degree. C. and eliminates the need for PbO atmosphere control. Densification to greater than 98% of theoretical density is achieved with firing times as short as 1-5 minutes. Dielectric properties depend upon the amount of V.sub.2 O.sub.5 added and upon the microstructure developed, but in general are equivalent to those reported for conventional PZT compositions.
Claims6
A fired PZT ceramic composition characterized by a density of at least 98% of theoretical density which composition consists essentially of a major amount of lead zirconate-lead titanate having the formula Pb(ZrTi)O.sub.3 wherein the Zr:Ti molar ratio ranges from about 65:35 to about 35:65, and from about 0.1 to about 6.0% by weight of V.sub.2 O.sub.5.
A process for preparing PZT ceramic compositions characterized by a density of at least 98% of theoretical density comprising the steps of milling and blending a lead zirconate-lead titanate powder having the formula Pb(ZrTi)O.sub.3, wherein the Zr:Ti molar ratio ranges from about 65:35 to about 35:65, with from about 0.1 to about 6.0% by weight of a V.sub.2 O.sub.5 -affording promoter, pressing, and firing the blended powder in air at a temperature of from about 860.degree. to about 975.degree. C. for from about 1 to about 120 minutes.
Dependencies are inferred from the claim text.