US4330593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
PZT/Polymer composites and their fabrication
Assignee: United States Department of the Navy
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Filing: 1980-11-13
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Granted: 1982-05-18
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Expires: 2000-11-13
Abstract
Abstract PZT/polymer composites and a simplified method of their fabrication are described. Commercially available PZT Pb(Zr, Ti)O3 powder is thoroughly mixed with a binder such as polyvinylalcohol and polymethyl methacrylate (PMM) spheres and pressed into pellets. The binder and PMM spheres are burnt out by heating pellets slowly and the porous pellets so obtained are sintered by heating them in closed high-purity alumina crucibles and lead zirconate as a source of lead is added thereto. The highly porous pellets thus obtained are impregnated with a suitable polymer such as silicone rubber elastomer or vinylcyclohexene dioxide epoxy.
Inventors
- 👤 Thomas R. Shrout
- 👤 Walter A. Schulze
- 👤 James V. Biggers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:27
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/853; H10N30/8548; H10N30/8554; H10N30/852; Y; Y10; Y10T; Y10T29/00; Y10T29/42; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
Method for fabricating PZT/polymer composites from commercially available PZT powder which comprises the steps of: mixing the PZT powder with a binder and plurality of polymethyl methacrylate (PMM) spheres and making a plurality of pellets thereof; sintering said plurality of pellets to burn said plurality of PMM spheres and thus making said plurality of pellets porous; adding lead zirconate to said plurality of porous pellets; and impregnating said plurality of porous pellets with silicone rubber elastomer.
Claim 2
Dependent Claim
76 words
Method for fabricating PZT/polymer composites from commercially available PZT powder which comprises the steps of: mixing the PZT powder with a binder and plurality of polymethyl methacrylate (PMM) spheres and making a plurality of pellets thereof; sintering said plurality of pellets to burn said plurality of PMM spheres and thus making said plurality of pellets porous; adding lead zirconate to said plurality of porous pellets; and impregnating said plurality of porous pellets with silicone rubber elastomer.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the sintering said plurality of pellets includes slow heating to avoid cracking thereof.
Claim 4
Dependent Claim
22 words
The method of claim 2 wherein the steps of impregnating said plurality of porous pellets includes the use of vinylcyclohexene dioxide epoxy.
Claim 5
Dependent Claim
55 words
PZT/polymer composites for fabricating acoustic transducers which comprise: a commercially available powder thoroughly mixed with a plurality of polymethyl methacrylate (PMM) spheres and polyvinylalcohol formed and sintered into a plurality of porous pellets; lead zirconate added to said plurality of porous pellets; and a polymer impregnated into said plurality of porous pellets containing lead zirconate.
Claim 6
Dependent Claim
55 words
PZT/polymer composites for fabricating acoustic transducers which comprise: a commercially available powder thoroughly mixed with a plurality of polymethyl methacrylate (PMM) spheres and polyvinylalcohol formed and sintered into a plurality of porous pellets; lead zirconate added to said plurality of porous pellets; and a polymer impregnated into said plurality of porous pellets containing lead zirconate.
Claim 7
Dependent Claim
19 words
PZT/polymer composites of claim 4 wherein said polymer is silicone rubber elastomer for providing flexibility to said PZT/polymer composites.
Claim 8
Dependent Claim
12 words
PZT/polymer composites of claim 4 wherein said polymer is vinylcyclohexene dioxide epoxy.
References Cited (Backward Citations)
US4076892A
Cited
US4227111A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-17 | 1989-11-16 | 1990-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-17 | 1993-11-16 | 1994-05-18 | $7700.00 | Window Closed / Lapsed |