US4108646A
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Strontium-bearing master composition for addition to eutectic and hypo-eutectic silicon-aluminum casting alloys
Assignee: KB Alloys Inc
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Filing: 1977-01-28
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Granted: 1978-08-22
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Expires: 1997-01-28
Abstract
Abstract A master composition for modifying the eutectic component of eutectic and hypo-eutectic silicon-aluminum casting alloys comprises an intimate admixture, in powder or compact form, of a) particles of strontium-silicon and, in certain case, b) particles of an aluminous material, e.g., aluminum. The modification of the silicon-aluminum casting alloys is achieved by adding to the alloy while the alloy is in molten form an effective amount of the master composition, e.g., such as to introduce between about 0.005 and 0.4 percent by weight of strontium into said alloy.
Inventors
- 👤 Richard J. Gennone
- 👤 Robert D. Sturdevant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:02
CPC Classifications
C; C22; C22C; C22C1/00; C22C21/00; C22C21/02; C22C21/04
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
39 words
A master composition for modifying the eutectic component of eutectic and hypo-eutectic aluminum-silicon casting alloys, said composition consisting essentially of a mixture of: (a) particles of strontium-bearing material consisting essentially of strontium-silicon; and (b) particles of an aluminous material.
Claim 2
Dependent Claim
39 words
A master composition for modifying the eutectic component of eutectic and hypo-eutectic aluminum-silicon casting alloys, said composition consisting essentially of a mixture of: (a) particles of strontium-bearing material consisting essentially of strontium-silicon; and (b) particles of an aluminous material.
Claim 3
Dependent Claim
28 words
A master composition according to claim 1 wherein the particles of aluminous material are selected from the group consisting of particles of aluminum and particles of aluminum-silicon alloy.
Claim 4
Dependent Claim
24 words
A master composition according to claim 2 wherein the particles of strontium-bearing material and particles of aluminous material are minus 20 Tyler mesh size.
Claim 5
Dependent Claim
22 words
A master composition according to claim 2 wherein the mixture of particles (a) and (b) is compacted into the form of briquettes.
Claim 6
Dependent Claim
44 words
A master composition according to claim 2 wherein: the strontium-silicon contains about 15 to 60 weight percent of strontium, about 40 to 75 weight percent of silicon, and the balance incidental impurities; and the particles of aluminous material consist essentially of particles of aluminum.
Claim 7
Dependent Claim
27 words
A master composition according to claim 5 wherein the strontium content of the master composition is between about 3 and 37 percent by weight of said composition.
Claim 8
Dependent Claim
27 words
A master composition according to claim 5 wherein the strontium content of the master composition is between about 10 and 30 percent by weight of said composition.
Claim 9
Dependent Claim
17 words
A master composition according to claim 5 containing additionally up to about 1 weight percent of calcium.
Claim 10
Dependent Claim
61 words
A process for producing a master composition for modifying the eutectic component of eutectic and hypoeutectic aluminum-silicon casting alloys, said process comprising (a) forming a mixture of (i) particles of strontium-bearing material consisting essentially of strontium-silicon; and (ii) particles of aluminous material; and (b) compacting the mixture formed in step (a) at a compression pressure of between 5,000 and 50,000 p.s.i.
Claim 11
Dependent Claim
61 words
A process for producing a master composition for modifying the eutectic component of eutectic and hypoeutectic aluminum-silicon casting alloys, said process comprising (a) forming a mixture of (i) particles of strontium-bearing material consisting essentially of strontium-silicon; and (ii) particles of aluminous material; and (b) compacting the mixture formed in step (a) at a compression pressure of between 5,000 and 50,000 p.s.i.
Claim 12
Dependent Claim
28 words
A process according to claim 9 wherein the particles of aluminous material are selected from the group consisting of particles of aluminum and particles of an aluminum-silicon alloy.
Claim 13
Dependent Claim
23 words
A process according to claim 10 wherein the particles of strontium-bearing material and particles of aluminous material are minus 20 Tyler mesh size.
Claim 14
Dependent Claim
43 words
A process according to claim 10 wherein: the strontium-silicon contains about 15 to 60 weight percent of strontium, about 40 to 75 weight percent of silicon, and the balance incidental impurities; and the particles of aluminous material consist essentially of particles of aluminum.
Claim 15
Dependent Claim
26 words
A process according to claim 12 wherein the strontium content of the master composition is between about 3 and 37 percent by weight of said composition.
Claim 16
Dependent Claim
26 words
A process according to claim 12 wherein the strontium content of the master composition is between about 10 and 30 percent by weight of said composition.
Claim 17
Dependent Claim
16 words
A process according to claim 12 containing additionally up to about 1 weight percent of calcium.
Claim 18
Dependent Claim
58 words
A process for modifying the eutectic component of eutectic and hypo-eutectic aluminum-silicon casting alloys comprising adding to said alloy while the alloy is in molten form, a modifying quantity of a master composition, said master composition consisting essentially of a mixture of: (a) particles of strontium-bearing material consisting essentially of strontium-silicon; and (b) particles of an aluminous material.
Claim 19
Dependent Claim
58 words
A process for modifying the eutectic component of eutectic and hypo-eutectic aluminum-silicon casting alloys comprising adding to said alloy while the alloy is in molten form, a modifying quantity of a master composition, said master composition consisting essentially of a mixture of: (a) particles of strontium-bearing material consisting essentially of strontium-silicon; and (b) particles of an aluminous material.
Claim 20
Dependent Claim
28 words
A process according to claim 16 wherein the particles of aluminous material are selected from the group consisting of particles of aluminum and particles of an aluminum-silicon alloy.
Claim 21
Dependent Claim
23 words
A process according to claim 17 wherein the particles of strontium-bearing material and particles of aluminous material are minus 20 Tyles mesh size.
Claim 22
Dependent Claim
37 words
A process according to claim 17 wherein the amount of master composition added to the molten alumimum-silicon casting alloy is such as to introduce between about 0.005 and 0.4 percent by weight of strontium into said alloy.
Claim 23
Dependent Claim
21 words
A process according to claim 17 wherein: the mixture of particles (a) and (b) is compacted into the form of briquettes.
Claim 24
Dependent Claim
43 words
A process according to claim 17 wherein: the strontium-silicon contains about 15 to 60 weight percent of strontium, about 40 to 75 weight percent of silicon, and the balance incidental impurities; and the particles of aluminous material consist essentially of particles of aluminum.
Claim 25
Dependent Claim
26 words
A process according to claim 21 wherein the strontium content of the master composition is between about 3 and 37 percent by weight of said composition.
Claim 26
Dependent Claim
26 words
A process according to claim 21 wherein the strontium content of the master composition is between about 10 and 30 percent by weight of said composition.
Claim 27
Dependent Claim
20 words
A process according to claim 21 wherein the master composition contains additionally up to about 1 weight percent of calcium.
References Cited (Backward Citations)
US3466170A
Cited
US3567429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-21 | 1982-02-20 | 1982-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-21 | 1986-02-20 | 1986-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-21 | 1990-02-20 | 1990-08-22 | $7700.00 | Window Closed / Lapsed |