US4341533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-hardness abrasive product based on alumina and aluminium oxycarbides and process for preparing same
Assignee: FRANCAISE D`ELECTROMETALLURGIE-SOFREM A CORP OF FRANCE Ste
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Filing: 1980-07-03
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Granted: 1982-07-27
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Expires: 2000-07-03
Abstract
Abstract The invention relates to a new class of high-hardness abrasive products and wear resistant parts based on alumina and aluminium oxycarbides. By fusing alumina in the presence of a carbonaceous substance and by controlled cooling, it is possible to obtain a large number of products in which the ratio ρ of the number of carbon atoms to the number of carbon atoms plus oxygen atoms is between 0.01 and 0.50, and preferably between 0.02 and 0.20. These products are essentially constituted by primary alumina crystals in a eutectic matrix Al 2 O 3 - Al 4 O 4 C or Al 2 O 3 - Al 2 OC.
Inventors
- 👤 Marc Daire
- 👤 Yves Larrere
- 👤 Andre Mangin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:37
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; C09K3/1427; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/107
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
63 words
A high-hardness abrasive product, characterised in that it is constituted by the combination of crystalline phases of alumina and of at least one of the two aluminium oxycarbides Al 2 OC and Al 4 O 4 C, in which the ratio ρ of the number of carbon atoms to the number of carbon atoms plus oxygen atoms (C/C+O) is between 0.01 and 0.50.
Claim 2
Dependent Claim
63 words
A high-hardness abrasive product, characterised in that it is constituted by the combination of crystalline phases of alumina and of at least one of the two aluminium oxycarbides Al 2 OC and Al 4 O 4 C, in which the ratio ρ of the number of carbon atoms to the number of carbon atoms plus oxygen atoms (C/C+O) is between 0.01 and 0.50.
Claim 3
Dependent Claim
20 words
A high-hardness abrasive product, according to claim 1, characterised in that the ratio ρ is preferably between 0.02 and 0.20.
Claim 4
Dependent Claim
45 words
A high-hardness abrasive product, according to claim 1 or 2, characterised in that it is constituted by a dispersion of primary alumina crystals in a eutectic matrix (Al 2 O 3 -Al 4 O 4 C) with a ratio ρ of between 0.01 and 0.1.
Claim 5
Dependent Claim
36 words
A high-hardness abrasive product, according to claim 1 or 2, characterised in that it is constituted by the eutectic Al 2 O 3 -Al 4 O 4 C with a ratio ρ substantially equal to 0.10.
Claim 6
Dependent Claim
48 words
A high-hardness abrasive product, according to claim 1 or 2, characterised in that it is constituted by a dispersion of Al 4 O 4 C particles in a eutectic matrix Al 2 O 3 -Al 4 O 4 C with a ratio ρ of between 0.10 and 0.20.
Claim 7
Dependent Claim
42 words
A high-hardness abrasive product, according to claim 1 or 2, characterised in that it is constituted by a dispersion of primary alumina crystals in a eutectic matrix Al 2 O 3 -Al 2 OC with a ratio ρ between 0.01 and 0.13.
Claim 8
Dependent Claim
34 words
A high-hardness abrasive product, according to claim 1 or 2, characterised in that it is constituted by the eutectic Al 2 O 3 -Al 2 OC with a ratio ρ substantially equal to 0.13.
Claim 9
Dependent Claim
49 words
A high-hardness abrasive product, according to claim 1 or 2, characterised in that it is constituted by a dispersion of Al 2 OC particles in a eutectic matrix Al 2 O 3 -Al 2 OC with a ratio ρ of between 0.13 and 0.50, preferably between 0.13 and 0.20.
Claim 10
Dependent Claim
44 words
A high-hardness abrasive product, according to claim 1 or 2, characterised by a ternary combination of crystalline phases Al 2 O 3 -Al 2 OC-Al 4 O 4 C with a ratio ρ of between 0.02 and 0.50 and preferably between 0.02 and 0.20.
Claim 11
Dependent Claim
88 words
A process for the preparation of high-hardness abrasive products comprising the steps of fusing alumina in the presence of a carbonaceous substance to derive a reaction product constituted by alumina and at least one of the two aluminum oxycarbides Al 2 OC and Al 4 O 4 C in which the ratio ρ of the number of carbon atoms to the number of carbon atoms plus oxygen atoms (C/C+O) is between 0.01 and 0.50 and cooling the the reaction product to a solid at a controlled, predetermined rate.
Claim 12
Dependent Claim
88 words
A process for the preparation of high-hardness abrasive products comprising the steps of fusing alumina in the presence of a carbonaceous substance to derive a reaction product constituted by alumina and at least one of the two aluminum oxycarbides Al 2 OC and Al 4 O 4 C in which the ratio ρ of the number of carbon atoms to the number of carbon atoms plus oxygen atoms (C/C+O) is between 0.01 and 0.50 and cooling the the reaction product to a solid at a controlled, predetermined rate.
Claim 13
Dependent Claim
40 words
A process for the preparation of high-hardness abrasive products according to claim 10, characterised in that the carbonaceous substance is selected from the group comprising graphite, coke, lamp black, amorphous carbon aluminum carbide and a mixture of carbon and aluminum.
Claim 14
Dependent Claim
27 words
A process for the preparation of high-hardness abrasive products according to claim 10, characterised in that the carbonaceous substance is aluminium carbide Al 4 C 3 .
Claim 15
Dependent Claim
26 words
A process for the preparation of high-hardness abrasive products according to claim 10, characterised in that the carbonaceous substance is a mixture of carbon and aluminium.
Claim 16
Dependent Claim
31 words
A process for the preparation of high-hardness abrasive products according to any one of claims 10 to 13, characterised in that the fusing is carried out under a dry inert gas.
Claim 17
Dependent Claim
37 words
A process for the preparation of high-hardness abrasive products according to claim 10, 11, 12 or 13, characterized in that the fusing and at least the beginning of the cooling are carried out under dry inert gas.
Claim 18
Dependent Claim
43 words
A process for the preparation of high-hardness abrasive products according to claim 10, 11, 12 or 15, characterised in that the reaction product is cooled at a high rate by casting over a plurality of metallic masses or into a large metallic mould.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-26 | 1986-01-25 | 1986-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-26 | 1990-01-25 | 1990-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-26 | 1994-01-25 | 1994-07-27 | $7700.00 | Window Closed / Lapsed |