US3973977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Making spinel and aluminum-base metal cermet
Assignee: Corning Glass Works
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Filing: 1975-10-06
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Granted: 1976-08-10
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Expires: 1995-10-06
Abstract
Abstract Dense coherent composition of matter composed essentially of, on a weight basis, 10 to 30% aluminum-base metal phase finely interspersed throughout a mass of substantially submicron size crystals of at least 60% magnesium aluminate spinel, 0 to 10% alpha alumina, 0 to 2% mullite and 0 to 5% magnesium aluminum boride. Made by bringing molten aluminum-base metal at 650°-850°C. (only up to 750°C when MgO content of the base composition noted below is less than 8%) into contact with a mass of melted and solidified material consisting essentially of, analytically by weight, at least 65% being a base composition and 0 to 35% B 2 O 3 , the base composition consisting of 5 to less than 40% MgO, 5 to 43% Al 2 O 3 and 35 to 85% SiO 2 . Upon contact, metal reacts with mass to transform a substantial portion of the mass into the cermet composition of matter. May be used in form of abrasive grain and/or abrasive articles.
Inventors
- 👤 Lois E. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:51
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/01; C04B35/44; C04B35/622; C04B35/653; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; C09K3/1427
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
197 words
A method of making a dense, coherent, substantially homogeneous cermet composition of matter composed essentially of, on a weight basis, at least 60% magnesium aluminate spinel crystals, 0 to 10% alpha alumina crystals, 0 to 2% mullite crystals, 0 to 5% magnesium aluminum boride crystals and 10 to 30% aluminum-base metal phase, which method comprises providing a mass of melted and solidified material consisting essentially of, analytically by weight, at least 65% being a base composition and 0 to 35% B 2 O 3 , the base composition consisting of 5 to less than 40% MgO, 5 to 43% Al 2 O 3 and 35 to 85% SiO 2 , contacting the mass with molten aluminum-base metal maintained at temperature in the range of about 650° to 850°C. when the MgO content of the base composition is at least 8% and in the range of about 650° to 750°C. when the MgO content of the base composition is less than 8%, maintaining the mass in contact with the molten metal for a time sufficient to effect reaction between the mass and the molten metal and to transform a substantial portion of the mass into the cermet composition.
Claim 2
Independent Claim
197 words
A method of making a dense, coherent, substantially homogeneous cermet composition of matter composed essentially of, on a weight basis, at least 60% magnesium aluminate spinel crystals, 0 to 10% alpha alumina crystals, 0 to 2% mullite crystals, 0 to 5% magnesium aluminum boride crystals and 10 to 30% aluminum-base metal phase, which method comprises providing a mass of melted and solidified material consisting essentially of, analytically by weight, at least 65% being a base composition and 0 to 35% B 2 O 3 , the base composition consisting of 5 to less than 40% MgO, 5 to 43% Al 2 O 3 and 35 to 85% SiO 2 , contacting the mass with molten aluminum-base metal maintained at temperature in the range of about 650° to 850°C. when the MgO content of the base composition is at least 8% and in the range of about 650° to 750°C. when the MgO content of the base composition is less than 8%, maintaining the mass in contact with the molten metal for a time sufficient to effect reaction between the mass and the molten metal and to transform a substantial portion of the mass into the cermet composition.
Claim 3
Dependent Claim
59 words
The method of claim 1 comprising providing the mass of melted and solidified material consisting essentially of, analytically by weight, at least 80% being the base composition and 0 to 20% B 2 O 3 , the base composition consisting of 8 to 30% MgO, 15 to 40% Al 2 O 3 and 45 to 70% SiO 2 .
Claim 4
Dependent Claim
23 words
The method of claim 2 wherein the analytical B 2 O 3 content of the mass is about 4 to 14% by weight.
Claim 5
Dependent Claim
33 words
The method of claim 2 wherein the mass is formed during solidification thereof into bodies of predetermined shape and size, and the bodies are contacted with the molten metal by being immersed therein.
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) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |