GB1583083A - Master composition and process for the eutectic component of eutectic and hypo-eutectic aluminiumsilicon casting alloys - Google Patents

Master composition and process for the eutectic component of eutectic and hypo-eutectic aluminiumsilicon casting alloys Download PDF

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Publication number
GB1583083A
GB1583083A GB21749/77A GB2174977A GB1583083A GB 1583083 A GB1583083 A GB 1583083A GB 21749/77 A GB21749/77 A GB 21749/77A GB 2174977 A GB2174977 A GB 2174977A GB 1583083 A GB1583083 A GB 1583083A
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silicon
strontium
aluminium
composition
weight percent
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GB21749/77A
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Kawecki Berylco Industries Inc
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Kawecki Berylco Industries Inc
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Priority claimed from US05/763,553 external-priority patent/US4108646A/en
Application filed by Kawecki Berylco Industries Inc filed Critical Kawecki Berylco Industries Inc
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C22C21/04—Modified aluminium-silicon alloys

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Silicon Compounds (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Details Of Indoor Wiring (AREA)
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Description

(54) A MASTER COMPOSITION AND PROCESS FOR MODIFYING THE EUTECTIC COMPONENT OF EUTECTIC AND HYPO-EUTECTIC ALUMINIUM-SILICON CASTING ALLOYS (71) We, KAWECKI BERYLCO INDUS TRIES, INC., a corporation organized and existing under the laws of the State of Pennsylvania, United States of America, of Tuckerton Road, Reading, State of Pennsylvania, United States of America do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to a master composition and process for modifying the eutectic component of eutectic and hypo eutectic aluminium-silicon casting alloys.
In the Complete specification of our copending Application for Letters Patent No.
24241/76 (now matured into Patent No.
1510915) there are described and claimed a master composition for modifying the eutectic component of eutectic and hypoeutectic aluminium-silicon casting alloys, the master composition comprising a particulate mixture of strontium silicide with an aluminous material, and a process for modifying the eutectic component of a eutectic or hypo-eutectic aluminium-silicon casting alloy, the process comprising adding to the molten casting alloy a quantity of a master composition sufficient to modify the eutectic component of the casting alloy, the master composition comprising a particulate strontium silicide.
The material referred to in the aforementioned specification as "strontiumsilicide" and known commercially by this name is in fact neither a simple alloy nor a true ionic compound nor a true covalent compound. The material in fact appears to be a mixture including an intermetallic compound of strontium and silicon. The commercially-available product comprises from 15 to 60 weight percent of strontium, from 40 to 79 weight percent of silicon, and up to 10 weight percent of incidental im Purifies such as calcium, iron, barium, carbon, managese, titanium and zirconium.
For example, a material prepared in accordance with United States Patent Specification No. 3,374,086 contained 42 to 47 weight percent of strontium, 47 to 52 weight percent of silicon, about 4 weight percent of iron and about 1 to 3 weight percent of calcium.
Strontium silicide, SrSi2, a known compound, contains 61 weight percent of strontium and 39 weight percent of silicon. A study of the structure of commercial "strontium-silicide" by X-ray diffraction indicates that the strontium is present mainly in the form of SrSi2. Strontium-silicon containing less than 61 weight percent strontium therefore appears to contain strontium in the form of SrSi,, together with excess silicon.
Thus, it is perhaps more appropriate to refer to the commercially-available material as strontium-silicon, and this term will be used hereinafter for this material.
The complete specification of our aforementioned co-pending Application No.
24241/76 (Serial No. 1510915) discloses that amongst the aluminous materials which may be used in the master composition and process disclosed therein are aluminium powder, mixture of aluminium and magnesium powders and powdered aluminiummagnesium alloys. It has now been discovered that aluminium-silicon alloys, which alloys are not specifically disclosed in the aforementioned complete specification, may also be used in the master composition disclosed therein.
Accordingly, the invention provides a master composition for modifying the eutectic component of eutectic and hypoeutectic aluminium-silicon casting alloys, the master composition comprising a particulate mixture of strontium-silicon with an aluminium-silicon alloy.
The invention also provides a process for producing a master composition of the invention, in which process particulate strontium-silicon is mixed with a particulate aluminium-silicon alloy and the mixture thereafter compacted into briquettes under a pressure of from 5000 to 50000 p.s.i.
to the molten casting alloy a quantity of a master composition sufficient to modify the eutectic component of the casting alloy, the master composition comprising a particulate mixture of strontium-silicon with an aluminium-silicon alloy.
The master composition of the invention desirably contains from 3 to 37 weight percent, and preferably from 10 to 30 weight percent, of strontium. It may incorporate minor amounts of other elements, (for example, calcium, iron, barium, carbon, manganese aiid zirconium) which often find their way into the master composition through the strontium-silicon, provided that these "minor amounts" of other elements do not adversely affect the properties of the master composition. Thus, for example, calcium can be present in the master composition of the invention in amounts not exceeding 1 percent by weight. In some cases, the presence of calcium in amounts within the aforesaid range, and particularly within the range of about 0.1 to ] percent by weight, will improve the performance of the master composition.
Desirably, both particulate components of the master composition should have particle sizes, prior to compaction, of 20 mesh or finer, and preferably below 100 mesh, Tyler Standard for optimum results, regardless of whether the composition is to be used in the loose or compacted form. In many cases, the particle size can be minus 325 mesh. As a general rule, it is advantageous to work with smaller particle sizes with decreasing content of aluminium-silicon alloy, particularly when the master composition is intended for use in compacted form in order to take full advantage of the binding ability of the aluminium-silicon alloy.
The preferred type of strontium-silicon for -use in the composition and process of the present invention is one containing from 15 to 60 weight percent of strontium and 40 to 75 weight percent of silicon, the balance (up to 10 percent by weight) comprising incidental impurities such as calcium, iron, barium, carbon, manganese and zirconium. A process for preparing such a strontium-silicon is described in the aforementioned United States Patent Specification No. 3,374,086. One especially preferred strontium-silicon contains 42 to 47 weight percent of strontium, 47 to 52 weight percent of silicon, 4 weight percent of iron and 1 to 3 weight percent of calcium.
The Dreferred type of aluminium-silicon alloy comprises from 10 to 90 weight percent of aluminium.
In modifying the structure of eutectic and hypo-eutectic aluminium-silicon casting alloys according to the present invention the master composition of the invention is added to the alloy to be modified while the Finally, the invention provides a process for modifying the eutectic component of a eutectic or hypo-eutectic aluminium-silicon casting alloy, the process comprising adding latter is in a molten condition. The master composition can be added in briquette form or in loose form such as can be conveniently achieved by using bags or other consumable containers to contain predetermined quantities of the master composition.
When employed in the loose form, the master composition is desirably introduced below the surface of the molten aluminiumsilicon -alloy by means of conventional plunging or immersion devices and techniques. The density of the master composition, when added in compacted form, can be controlled by adjustment of composition parameters such as chemical composition, compacting pressure and particle size. When using compacted compositions, it is advantageous to avoid very high compaction densities in order to obtain the best solution rates. Generally, densities of between about 65 to 90 percent of the maximum theoretical density (i.e. the density of the fully alloyed constituents of the composition) are preferred (see United States Patent Specification No. 3,592,637, column 12, lines 47 through 52). Compaction pressures in the range of 5,000 to 50,000 p.s.i.
can be used.
The amount of master composition added to the aluminium-silicon casting alloy can vary depending on the composition of the alloy and on the degree of modification sought. Desirably, the amount used is such as to introduce from 0.005 to 0.4 weight percent of strontium into the aluminiumsilicon alloy.
In addition to the fact that strontiumsilicon costs from one-half to one-fortieth the cast of strontium metal suitable for making a strontium-aluminium master alloy, strontium-silicon does not significantly oxidize or burn when the composition is added, in either loose or compacted form, to mol- ten silicon-aluminium casting alloys.
The master compositions of the invention possess a further advantage over previouslyknown strontium-containing master alloys in that there is virtually no limit to the variation in proportions of strontium and aluminium that can be added to the aluminjum-silicon casting alloys using the physical admixtures of the present invention.
WHAT WE CLAIM IS:- 1. A master composition for modifying the eutectic component of eutectic and hypo-eutectic aluminium-silicon casting alloys, the master composition comprising a particulate mixture of strontium-silicon with an aluminium-silicon alloy.
2. A master composition as claimed in Claim 1, compacted into the form of bri
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (24)

**WARNING** start of CLMS field may overlap end of DESC **. to the molten casting alloy a quantity of a master composition sufficient to modify the eutectic component of the casting alloy, the master composition comprising a particulate mixture of strontium-silicon with an aluminium-silicon alloy. The master composition of the invention desirably contains from 3 to 37 weight percent, and preferably from 10 to 30 weight percent, of strontium. It may incorporate minor amounts of other elements, (for example, calcium, iron, barium, carbon, manganese aiid zirconium) which often find their way into the master composition through the strontium-silicon, provided that these "minor amounts" of other elements do not adversely affect the properties of the master composition. Thus, for example, calcium can be present in the master composition of the invention in amounts not exceeding 1 percent by weight. In some cases, the presence of calcium in amounts within the aforesaid range, and particularly within the range of about 0.1 to ] percent by weight, will improve the performance of the master composition. Desirably, both particulate components of the master composition should have particle sizes, prior to compaction, of 20 mesh or finer, and preferably below 100 mesh, Tyler Standard for optimum results, regardless of whether the composition is to be used in the loose or compacted form. In many cases, the particle size can be minus 325 mesh. As a general rule, it is advantageous to work with smaller particle sizes with decreasing content of aluminium-silicon alloy, particularly when the master composition is intended for use in compacted form in order to take full advantage of the binding ability of the aluminium-silicon alloy. The preferred type of strontium-silicon for -use in the composition and process of the present invention is one containing from 15 to 60 weight percent of strontium and 40 to 75 weight percent of silicon, the balance (up to 10 percent by weight) comprising incidental impurities such as calcium, iron, barium, carbon, manganese and zirconium. A process for preparing such a strontium-silicon is described in the aforementioned United States Patent Specification No. 3,374,086. One especially preferred strontium-silicon contains 42 to 47 weight percent of strontium, 47 to 52 weight percent of silicon, 4 weight percent of iron and 1 to 3 weight percent of calcium. The Dreferred type of aluminium-silicon alloy comprises from 10 to 90 weight percent of aluminium. In modifying the structure of eutectic and hypo-eutectic aluminium-silicon casting alloys according to the present invention the master composition of the invention is added to the alloy to be modified while the Finally, the invention provides a process for modifying the eutectic component of a eutectic or hypo-eutectic aluminium-silicon casting alloy, the process comprising adding latter is in a molten condition. The master composition can be added in briquette form or in loose form such as can be conveniently achieved by using bags or other consumable containers to contain predetermined quantities of the master composition. When employed in the loose form, the master composition is desirably introduced below the surface of the molten aluminiumsilicon -alloy by means of conventional plunging or immersion devices and techniques. The density of the master composition, when added in compacted form, can be controlled by adjustment of composition parameters such as chemical composition, compacting pressure and particle size. When using compacted compositions, it is advantageous to avoid very high compaction densities in order to obtain the best solution rates. Generally, densities of between about 65 to 90 percent of the maximum theoretical density (i.e. the density of the fully alloyed constituents of the composition) are preferred (see United States Patent Specification No. 3,592,637, column 12, lines 47 through 52). Compaction pressures in the range of 5,000 to 50,000 p.s.i. can be used. The amount of master composition added to the aluminium-silicon casting alloy can vary depending on the composition of the alloy and on the degree of modification sought. Desirably, the amount used is such as to introduce from 0.005 to 0.4 weight percent of strontium into the aluminiumsilicon alloy. In addition to the fact that strontiumsilicon costs from one-half to one-fortieth the cast of strontium metal suitable for making a strontium-aluminium master alloy, strontium-silicon does not significantly oxidize or burn when the composition is added, in either loose or compacted form, to mol- ten silicon-aluminium casting alloys. The master compositions of the invention possess a further advantage over previouslyknown strontium-containing master alloys in that there is virtually no limit to the variation in proportions of strontium and aluminium that can be added to the aluminjum-silicon casting alloys using the physical admixtures of the present invention. WHAT WE CLAIM IS:-
1. A master composition for modifying the eutectic component of eutectic and hypo-eutectic aluminium-silicon casting alloys, the master composition comprising a particulate mixture of strontium-silicon with an aluminium-silicon alloy.
2. A master composition as claimed in Claim 1, compacted into the form of bri
quettes.
3. A master composition as claimed in either of the preceding claims, whose strontium content is from 3 to 37 weight percent.
4. A master composition as claimed in Claim 3, whose strontium content is from 10 to 30 weight percent.
5. A master composition as claimed in any of the preceding claims, in which the strontium-silicon contains from 15 to 60 weight percent of strontium and from 40 to 75 weight percent of silicon.
6. A master composition as claimed in any of the preceding claims, in which the particles of strontium-silicon and of aluminium-silicon alloy are minus 20 Tyler mesh size.
7. A master composition as claimed in Claim 6, in which the particles of strontiumsilicon and of aluminium-silicon alloy are minus 100 Tyler mesh size.
.
8 A master composition as claimed in any of the preceding claims in which the aluminium-silicon alloy comprises from 10 to 90 weight percent of aluminium.
9. A master composition as claimed in any of the preceding claims, further comprising calcium present in an amount not exceeding 1 weight percent.
10. A master composition as claimed in Claim 1 and substantially as herein described.
11. A process for producing a master composition as claimed in any of the preceding claims, in which process particulate strontium-silicon is mixed with a particulate aluminium-silicon alloy and the mixture thereafter compacted into briquettes under a pressure of from 5000 to 50000 p.s.i.
12. A process as claimed in Claim 11 and substantially as herein described.
13. A process for modifying the eutectic component of a eutectic or hypo-eutectic aluminium-silicon casting alloy, the process comprising adding to the molten casting alloy a quantity of a master composition sufficient to modify the eutectic component of the casting alloy, the master composition comprising a particulate mixture of strontium-silicon with an aluminium-silicon alloy.
14. A process as claimed in Claim 13, in which the quantity of the master composition added is sufficient to introduce from 0.005 to 0.4 weight percent of strontium into the casting alloy.
15. A process as claimed in Claim 13 or 14, in which the master composition has previously been compacted into the form of briquettes.
16. A process as claimed in Claim 15, in which the compaction has been effected un der a pressure of 5000 to 50000 p.s.i.
17. A process as claimed in any of Claims 13 to 16, in which the strontium content of the master composition is from 3 to 37 weight percent.
18. A process as claimed in Claim 17, in which the strontium content of the master composition is from 10 to 30 weight percent.
19. A process as claimed in any of Claims 13 to 18, in which the strontium-silicon contains from 15 to 60 weight percent of strontium and from 40 to 75 weight percent of silicon.
20. A process as claimed in any of Claims 13 to 19, in which the particles of strontium-silicon and of aluminium-silicon alloy are minus 20 Tyler mesh size.
21. A process as claimed in Claim 20, in which the particles of strontium-silicon and of aluminium-silicon alloy are minus 100 Tyler mesh size.
22. A process as claimed in any of Claims 13 to 21, in which the aluminium-silicon alloy comprises from 10 to 90 weight percent of aluminium.
23. A process as claimed in any of Claims 13 to 22, in which the master composition further comprises calcium present in an amount not exceeding 1 weight percent.
24. A process as claimed in Claim 13, and substantially as herein described.
GB21749/77A 1977-01-28 1977-05-24 Master composition and process for the eutectic component of eutectic and hypo-eutectic aluminiumsilicon casting alloys Expired GB1583083A (en)

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US05/763,553 US4108646A (en) 1975-06-11 1977-01-28 Strontium-bearing master composition for addition to eutectic and hypo-eutectic silicon-aluminum casting alloys

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AU (1) AU512023B2 (en)
DE (1) DE2719129A1 (en)
FR (1) FR2378870A2 (en)
GB (1) GB1583083A (en)
IT (1) IT1116633B (en)
NL (1) NL7705438A (en)
NO (1) NO771788L (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998000571A1 (en) * 1996-06-28 1998-01-08 Timminco Limited Strontium-aluminum intermetallic alloy granules
US6210460B1 (en) 1997-06-27 2001-04-03 Timminco Limited Strontium-aluminum intermetallic alloy granules

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2569804Y2 (en) * 1991-01-23 1998-04-28 株式会社タダノ Work vehicle drive
US20050189083A1 (en) * 2004-03-01 2005-09-01 Stahl Kenneth G.Jr. Casting mold and method for casting achieving in-mold modification of a casting metal
JP7003734B2 (en) * 2018-02-28 2022-01-21 東ソー株式会社 Bulk body containing strontium and its manufacturing method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE187414C (en) *
DE1255928B (en) * 1966-01-13 1967-12-07 Metallgesellschaft Ag Process to achieve a long-lasting refining effect in aluminum-silicon alloys
CH502440A (en) * 1967-09-21 1971-01-31 Metallgesellschaft Ag Process for the production of strontium- and / or barium-containing master alloys for the refinement of aluminum alloys
DE1608245B2 (en) * 1967-09-21 1975-10-02 Metallgesellschaft Ag, 6000 Frankfurt Process for the production of master alloys containing strontium
DE2423080A1 (en) * 1974-05-13 1975-11-27 Graenz Karl Barium and-or strontium-contg. alloys - prepd. by reacting lithium- contg. aluminium, silicon or magnesium melts with barium and-or strontium cpds.
CA1064736A (en) * 1975-06-11 1979-10-23 Robert D. Sturdevant Strontium-bearing master composition for aluminum casting alloys

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998000571A1 (en) * 1996-06-28 1998-01-08 Timminco Limited Strontium-aluminum intermetallic alloy granules
US5882443A (en) * 1996-06-28 1999-03-16 Timminco Limited Strontium-aluminum intermetallic alloy granules
US6132530A (en) * 1996-06-28 2000-10-17 Timminco Limited Strontium-aluminum intermetallic alloy granules
US6210460B1 (en) 1997-06-27 2001-04-03 Timminco Limited Strontium-aluminum intermetallic alloy granules

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NL7705438A (en) 1978-08-01
AU2495877A (en) 1978-11-09
NO771788L (en) 1978-07-31
IT1116633B (en) 1986-02-10
DE2719129A1 (en) 1978-08-10
DE2719129C2 (en) 1990-07-12
FR2378870B2 (en) 1981-06-12
JPS5394211A (en) 1978-08-18
AU512023B2 (en) 1980-09-18
FR2378870A2 (en) 1978-08-25

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940611