US3885941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a glass-reacted-ceramic component
Assignee: MRA Laboratories Inc
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Filing: 1974-03-20
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Granted: 1975-05-27
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Expires: 1994-03-20
Abstract
Abstract A titanate phase of titanates, zirconates and niobates containing calcium zirconate is combined in a glass-reactedceramic matrix containing cadmium oxide. Cadmium is volatilized from the matrix upon sintering and reacts with the niobate and diffuses into the titanate lattice. The total silica, alumina and boron oxide in the system is very limited, since they limit the cadmium reactivity and diffusion. The combination is sintered at about 2,000*F to cause growth of grains to the order of 20 microns so as to result in a ceramic having a high dielectric constant at a downwardly shifted Curie temperature.
Inventors
- 👤 Galeb H Maher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:15
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
A METHOD OF MAKING GLASS-REACTED-CERAMIC BODY COMPRISING MIXING A MAJOR PROPORTION OF A FINELY GROUND PREFIRED TITANATE CERAMIC CONTAINING A ZIRCONATE AND NIOBIUM OXIDE WHICH CERAMIC MATURES ABOVE 2.000*F, AND A MINOR PROPORTION OF A POWDERED LOW TEMPERATURE GLASS CONTAINING CADMIUM OXIDE, MIXING THE POWDER COMBINATION OF SAID CERAMIC AND SAID GLASS WITH A SUSPENSION MEDIUM, DEPOSITING THE SUSPENSION AND FIRING THE DEPOSIT IN AIR AT BETWEEN 1,800* AND 2,050*F FOR AT LEAST 1 HOUR AT TEMPERAURE SO AS TO MATURE SAID BODY AND CAUSE CADMIUM IONS FROM SAID GLASS TO REACT WITH SAID CERAMIC AND TO DIFFUSE INTO THE TIANATE LATTICE, WHEREBY GRAIN GROWTH IN SAID BODY IS ENHANCED AND THE CURIE TEMPERATURE OF SAID BODY IS SHIFTED DOWNWARDLY.
Claim 2
Independent Claim
120 words
A METHOD OF MAKING GLASS-REACTED-CERAMIC BODY COMPRISING MIXING A MAJOR PROPORTION OF A FINELY GROUND PREFIRED TITANATE CERAMIC CONTAINING A ZIRCONATE AND NIOBIUM OXIDE WHICH CERAMIC MATURES ABOVE 2.000*F, AND A MINOR PROPORTION OF A POWDERED LOW TEMPERATURE GLASS CONTAINING CADMIUM OXIDE, MIXING THE POWDER COMBINATION OF SAID CERAMIC AND SAID GLASS WITH A SUSPENSION MEDIUM, DEPOSITING THE SUSPENSION AND FIRING THE DEPOSIT IN AIR AT BETWEEN 1,800* AND 2,050*F FOR AT LEAST 1 HOUR AT TEMPERAURE SO AS TO MATURE SAID BODY AND CAUSE CADMIUM IONS FROM SAID GLASS TO REACT WITH SAID CERAMIC AND TO DIFFUSE INTO THE TIANATE LATTICE, WHEREBY GRAIN GROWTH IN SAID BODY IS ENHANCED AND THE CURIE TEMPERATURE OF SAID BODY IS SHIFTED DOWNWARDLY.
Claim 3
Dependent Claim
25 words
The method as claimed in claim 1 wherein the cadmium oxide is present in the glass in the amount of 20 to 85% by weight.
Claim 4
Dependent Claim
28 words
The method as claimed in claim 1 wherein the zirconate is present in the titanate ceramic as calcium zirconate in the range of 2% to 14.5% by weight.
Claim 5
Dependent Claim
23 words
The method as claimed in claim 1 wherein not less than 0.5% by weight of the niobate is present in the titanate ceramic.
Claim 6
Dependent Claim
29 words
The method as claimed in claim 1 wherein the finely ground prefired titanate ceramic is prepared by milling to particles less than 2 microns by high pressure jet pulverizing.
Claim 7
Dependent Claim
28 words
The method as claimed in claim 1 wherein the powdered low temperature glass is prepared by milling to particles less than 1 micron by high pressure jet pulverizing.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |