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US3953202A
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Phosphorus-bearing master composition for addition to hyper-eutectic silicon-aluminum casting alloys and process therefor
Assignee: KB Alloys Inc
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Filing: 1975-02-10
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Granted: 1976-04-27
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Expires: 1995-02-10
Abstract
Abstract A master composition for refining the primary silicon grains of hyper-eutectic silicon-aluminum casting alloys comprises an intimate admixture, in compact form, of pulverized ferrophosphorus and aluminum metal powder.
Inventors
- 👤 Robert T. C. Rasmussen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:44
CPC Classifications
C; C22; C22C; C22C21/00; C22C21/02; C22C21/04; C22C1/00; C22C1/02; C22C1/03
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
31 words
A master composition for adding a primary silicon grain-refining amount of phosphorus to hyper-eutectic silicon-aluminum alloys, said composition comprising an intimate mixture of particles of ferrophosphorus and particles of aluminum metal.
Claim 2
Dependent Claim
31 words
A master composition for adding a primary silicon grain-refining amount of phosphorus to hyper-eutectic silicon-aluminum alloys, said composition comprising an intimate mixture of particles of ferrophosphorus and particles of aluminum metal.
Claim 3
Dependent Claim
46 words
A master composition according to claim 1 wherein: the ferrophosphorus contains between about 20 and 30 weight percent phosphorus with the balance being made up essentially of iron; and the weight ratio of ferrophosphorus to aluminum in the master composition is between about 3:2 and 2:3.
Claim 4
Dependent Claim
45 words
A master composition according to claim 2 wherein: the ferrophosphorus contains between about 23 and 28 weight percent phosphorus; the weight ratio of ferrophosphorus to aluminum in the master composition is about 1:1, and the particles of ferrophosphorus and aluminum are about minus 100 mesh.
Claim 5
Dependent Claim
40 words
A master composition according to claim 3 wherein: the intimate mixture of particles is compressed into shaped compacts of convenient size for addition to molten hyper-eutectic silicon-aluminum alloys; and the particles of ferrophosphorus and aluminum are about minus 325 mesh.
Claim 6
Dependent Claim
40 words
A master composition according to claim 1 containing additionally particles of silicon in an amount so as to compensate for the dilution of the silicon content of the hyper-eutectic silicon-aluminum casting alloy caused by the addition of the master composition.
Claim 7
Dependent Claim
43 words
A process for refining the primary silicon grains of hyper-eutectic silicon-aluminum alloys, said process comprising adding to said alloy in molten form, a grain-refining amount of a master composition comprising a compacted intimate mixture of particles of ferrophosphorus and particles of aluminum metal.
Claim 8
Dependent Claim
43 words
A process for refining the primary silicon grains of hyper-eutectic silicon-aluminum alloys, said process comprising adding to said alloy in molten form, a grain-refining amount of a master composition comprising a compacted intimate mixture of particles of ferrophosphorus and particles of aluminum metal.
Claim 9
Dependent Claim
45 words
A process according to claim 6 wherein: the ferrophosphorus contains between about 20 and 30 weight percent phosphorus with the balance being made up essentially of iron; and the weight ratio of ferrophosphorus to aluminum in the master composition is between about 3:2 and 2:3.
Claim 10
Dependent Claim
43 words
A process according to claim 7 wherein: the ferrophosphorus contains between about 23 and 28 percent phosphorus; the weight ratio of ferrophosphorus to aluminum in the master composition is about 1:1; and the particles of ferrophosphorus and aluminum are about minus 100 mesh.
Claim 11
Dependent Claim
67 words
A process according to claim 8 wherein: the compacted intimate mixture of particles is in the form of shaped compacts of convenient size for addition to the molten alloy; the particles of ferrophosphorus and aluminum are about minus 325 mesh and; the master composition is added to the molten silicon-aluminum alloy in an amount which introduces at least about 0.01 weight percent of phosphorus into the alloy.
Claim 12
Dependent Claim
31 words
A process according to claim 9 wherein the master composition is added to the molten silicon-aluminum alloy in an mount which introduces about 0.025 weight percent of phosphorus into the alloy.
Claim 13
Dependent Claim
42 words
A process according to claim 6 wherein the compacted composition contains additionally particles of silicon in an amount so as to compensate for the dilution of the silicon content of the hyper-eutectic silicon-aluminum alloy caused by the addition of the master composition.
References Cited (Backward Citations)
US1940922A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |