Patent US6249742B1 successfully refreshed from Google Patents.
US4608215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of ceramics
Assignee: Honeywell International Inc
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Filing: 1983-12-23
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Granted: 1986-08-26
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Expires: 2003-12-23
Abstract
Abstract Ceramic materials comprising steatite or forsterite which are highly dense in nature may be prepared by admixing a hydrolyzed alcoholic solution of a silicon alkoxide with a solution prepared by adding an organomagnesium compound to an alcohol at gelation conditions. Following the formation of the gel, it is then dried at an elevated temperature of from about 300 DEG to about 500 DEG C. to remove volatile compounds as well as to decompose any remaining organic compounds and thereafter the powder is pressed into a desired shape. The formed shape is then sintered at a temperature in the range of from about 850 DEG to about 950 DEG C. to form a densified ceramic.
Inventors
- 👤 Stephen T. Gonczy
- 👤 Randy J. Lawson
- 👤 Bruce I. Rosen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:36
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/20; C01; C01B; C01B33/00; C01B33/20; C01B33/22
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
76 words
A process for the preparation of a fully dense ceramic body which comprises admixing a hydrolyzed alcoholic solution of a siilcon alkoxide with an alcoholic solution of an alkyl magnesium compound at gelation conditions, drying the resultant gel at an elevated temperature to remove volatile compounds, pressing the resultant powder into a desired shape, sintering the powder at a temperature of from about 850° to 950° C. to form a densified ceramic, and recovering said ceramic.
Claim 2
Dependent Claim
76 words
A process for the preparation of a fully dense ceramic body which comprises admixing a hydrolyzed alcoholic solution of a siilcon alkoxide with an alcoholic solution of an alkyl magnesium compound at gelation conditions, drying the resultant gel at an elevated temperature to remove volatile compounds, pressing the resultant powder into a desired shape, sintering the powder at a temperature of from about 850° to 950° C. to form a densified ceramic, and recovering said ceramic.
Claim 3
Dependent Claim
16 words
The process as set forth in claim 1 in which said organomagnesium compound is dipropyl magnesium.
Claim 4
Dependent Claim
16 words
The process as set forth in claim 1 in which said organomagnesium compound is dibutyl magnesium.
Claim 5
Dependent Claim
27 words
The process as set forth in claim 1 in which the admixing of said silicon alkoxide and said alkyl magnesium compound is effected in an inert atmosphere.
Claim 6
Dependent Claim
21 words
The process as set forth in claim 4 in which said inert atmosphere is provided for by the presence of nitrogen.
Claim 7
Dependent Claim
21 words
The process as set forth in claim 4 in which said inert atmosphere is provided for by the presence of argon.
Claim 8
Dependent Claim
18 words
The process as set forth in claim 1 wherein said gelation conditions include ambient temperatures and atmospheric pressure.
Claim 9
Dependent Claim
27 words
The process as set forth in claim 1 wherein said gel is dried at a temperature in the range of from about 300° to about 500° C.
Claim 10
Dependent Claim
15 words
The process as set forth in claim 1 wherein said silicon alkoxide is silicon methoxide.
Claim 11
Dependent Claim
15 words
The process as set forth in claim 1 wherein said silicon alkoxide is silicon ethoxide.
Claim 12
Dependent Claim
16 words
The process as set forth in claim 1 wherein said alcoholic solution comprises a methanol solution.
Claim 13
Dependent Claim
16 words
The process as set forth in claim 1 wherein said alcoholic solution comprises an ethanol solution.
Claim 14
Dependent Claim
36 words
The process as set forth in claim 1 wherein the mole ratio of magnesium to silicon in the powder is in a range of from 1:1 to about 2:1 moles of magnesium per mole of silicon.
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) | 1989-08-25 | 1990-02-24 | 1990-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-25 | 1994-02-24 | 1994-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-25 | 1998-02-24 | 1998-08-26 | $7700.00 | Window Closed / Lapsed |