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US3940276A
Expired / Lapsed
US
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Spinel and aluminum-base metal cermet
Assignee: Corning Glass Works
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Filing: 1973-11-01
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Granted: 1976-02-24
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Expires: 1993-11-01
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. 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
2026-10-31 17:05
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: 14
Claim 1
Independent Claim
48 words
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.
Claim 2
Dependent Claim
48 words
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.
Claim 3
Dependent Claim
54 words
The cermet composition of matter of claim 1 in which at least 90% by volume of the crystals of spinel, alumina and mullite are of a size less than 1 micron with their average size being not more than 0.5 micron, and the metal phase is finely interspersed throughout the mass of said crystals.
Claim 4
Dependent Claim
41 words
The cermet composition of matter of claim 1 which analytically comprises, on a weight basis, 2.5 to 33% MgO, 39 to 76% Al 2 O 3 , 0 to 22% B 2 O 3 and the balance being essentially aluminum-base metal.
Claim 5
Dependent Claim
52 words
The cermet composition of matter of claim 1 wherein the metal phase does not exceed 26% by weight and which analytically comprises, on a weight basis, 4.5 to 23% MgO, 49 to 74% Al 2 O 3 , 0 to 13% B 2 O 3 and the balance being essentially aluminum-base metal.
Claim 6
Dependent Claim
36 words
The cermet composition of matter of claim 4 composed wholly of, on a weight basis, at least 75% magnesium aluminate spinel crystals, 0 to 2% magnesium aluminum boride crystals and 10 to 26% aluminum-base metal phase.
Claim 7
Dependent Claim
23 words
The cermet composition of matter of claim 5 wherein the analytical B 2 O 3 content is 3 to 10% by weight thereof.
Claim 8
Dependent Claim
17 words
Abrasive grain composed of the cermet composition of matter of claim 2 in the form of particles.
Claim 9
Dependent Claim
17 words
Abrasive grain composed of the cermet composition of matter of claim 6 in the form of particles.
Claim 10
Dependent Claim
18 words
An abrasive article comprising a coacting combination of abrasive grain of claim 7 and abrasive grain bonding material.
Claim 11
Dependent Claim
16 words
An abrasive article comprising abrasive grain of claim 8 bonded together with abrasive grain bonding material.
Claim 12
Dependent Claim
18 words
A grinding wheel comprising a coacting combination of abrasive grain of claim 7 and abrasive grain bonding material.
Claim 13
Dependent Claim
24 words
A grinding wheel comprising abrasive grain of claim 8 bonded together with abrasive grain bonding material comprising organic resin bonding agent and filler material.
Claim 14
Dependent Claim
29 words
A coated abrasive article comprising a coacting combination of a flexible backing for coated abrasive grain and abrasive grain of claim 7 attached thereto by an abrasive grain adhesive.
References Cited (Backward Citations)
US3437468A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |