US3785807A - Method for producing a master alloy for use in aluminum casting processes - Google Patents

Method for producing a master alloy for use in aluminum casting processes Download PDF

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Publication number
US3785807A
US3785807A US00137986A US3785807DA US3785807A US 3785807 A US3785807 A US 3785807A US 00137986 A US00137986 A US 00137986A US 3785807D A US3785807D A US 3785807DA US 3785807 A US3785807 A US 3785807A
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US
United States
Prior art keywords
titanium
alloy
melt
boron
aluminum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00137986A
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English (en)
Inventor
S Backerud
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BACKERUD INNOVATION BOX 5035 S-181 05 LIDINGO SWEDEN A SWEDISH CORP AB
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Granges Aluminium AB
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Publication of US3785807A publication Critical patent/US3785807A/en
Assigned to BACKERUD INNOVATION AB, BOX 5035, S-181 05 LIDINGO, SWEDEN A SWEDISH CORP. reassignment BACKERUD INNOVATION AB, BOX 5035, S-181 05 LIDINGO, SWEDEN A SWEDISH CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: GRANGES ALUMINIUM AB,
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/03—Making non-ferrous alloys by melting using master alloys

Definitions

  • the present invention relates to a method for producing a master alloy which can be added to an aluminum melt before the melt solidifies, thereby to obtain finer grain size of the cast aluminum product with subsequent increase in the quality of the same.
  • the master alloys previously used have comprised mainly titanium, boron and a combination of titanium and boron.
  • Typical master alloys contain 2-l0 percent by weight titanium in aluminum, 0.3-5 percent by weight boron in aluminum and 2-10 percent by weight titanium together with 0.3-5 percent by weight boron in aluminum.
  • a usual composition is one containing 5 percent by weight titanium and 1 percent by weight boron in aluminum. Master alloys of this type are available commercially.
  • Master alloys containing titanium and boron are normally produced by dissolving the required quantities of titanium and boron in an aluminum melt at temperatures in excess of approximately L200 C.
  • the boron is added in the form of a boron salt, normally potassium borofluoride (KBF).
  • KBF potassium borofluoride
  • the boron salt is dissociated in the melt and the liberated boron then rapidly combines with the titanium present in the melt. It is also possible to disperse tine-grain titanium diboride in the melt.
  • a master alloy which is intended to be added to an aluminum melt to afford a grain refining effect during the solidification period, an aluminum melt containing 0.02-6 percent by weight titanium and 0.0l-2 percent by weight boron being produced, in which the boron is bound to the titanium in the form of titanium diboride, by either first dissolving titanium at a temperature such that the quantity added passes into solution, and then adding boron, or by dispersing titanium boride in an aluminum melt, and the method is characterized by the step of maintaining the melt containing titanium diboride at a temperature between the melting point of the mixture and 900 C while stirring the melt and for a period of time of at least min utes and at most 9 hours.
  • the titanium content of the master alloy is preferably 0.2-2 percent by weight and the boron content is preferably.0.l-l percent by weight and the temperature used during the dissolution phase is from l,200 to l,500 C.
  • the alloy is then cooled to the holding temperature between the melting point and 900 C.
  • a preferred holding temperature is 680-720 C and apreferred holding time is from 45 minutes to 2.5 hours.
  • the pre-alloy can be used directly or subsequent to solidifying, although it is normal practice to decant the molten master alloy to prevent the formation of large agglomerates of titanium diboride and other impurities from accompanying the master alloy.
  • Al Ti It is thus necessary to exceed the solubility limit or liquiduscurve in the constitutional diagram for Al Ti, which can be effected by raising the concentration of titanium or by changing the position of the solubility curve by means of appropriate additives. In this way, Al Ti will crystallize around the TiB grains and form small crystals, which constitute the actual crystallization nuclei. The formation of Al Ti takes place during the holding time at the aforementioned temperature interval of the invention.
  • the titanium content of the master alloy is of such magnitude that Al Ti can be formed in the whole melt, large quantities of Al Ti crystals will be formed, which when the master alloy is used will dissolve and give high titanium contents to the final product, but will of course also act as crystallization nuclei to a lesser extent, owing to the fact that these crystals will become considerably larger and fewer than those which are formed around the TiB -grains.
  • the initally irregular grains of TiB will, after approximately 1 hour, have been embraced by a more regularly shaped crystal shell comprising substantially Al Ti.
  • the formed crystals added to the aluminum melt are able to refine the grains rapidly and effectively. If the master alloy is not subjected to the crystallization of Al Ti around the TiB -particles during the holding period and during simultaneous agitation of the system, TiB will form aggregates which will be practically totally precipitated out by gravitational separation, and will either not be included during the casting process or will be entrained with the casting material, thereby rendering its use impossible for, for example, foil rolling, where the agglomerated TiB -particles cause the foil to be torn during the rolling operation.
  • the new master alloy of the present invention can be used in considerably small quantities or with a lower content of titanium and boron, since it is possible to utilize actively all the titanium and boron present therein.
  • the final, desired aluminum melt can be considered totally as a master alloy and that the melt can be treated in a manner whereby titanium and boron are first dissolved at higher temperatures and the whole melt than maintained at a temperature of approximately 700 C for a period of 1 hour under agitation. in this way grain refinement would be equivalent to that obtained with the master alloy of the present invention.
  • Such treatment of an aluminum melt is expensive, extremely difficult to carry out technically and gives an undesirable content of titanium in the product. It is, instead, particularly desirable to produce a master alloy which can be used in continuous casting processes externally of the furnace in a special container or in the actual pouring stream.
  • the master alloy of the present invention is particularly suited for this purpose, since it can be passed to the melt just before the melt is to be transferred to the mould and intimately blended with the melt. In this way, the grain refining agent is able to exert its influence immediately and a superior product is obtained with a considerably smaller total quantity of titanium and boron in the finished product.
  • a method for preparing a master alloy intended to be added to an aluminum melt for refining the grains of the aluminum during solidification thereof comprising the steps of a. preparing an alloy melt consisting essentially of 0.02-6 percent by weight of titanium and 0.0l-2 percent by weight of boron, the balance being aluminum and wherein the boron is bound to titanium in the form of titanium diboride, and
  • cooling step comprises cooling the alloy melt to a temperature below the melting point of the alloy and then reheating the cooled alloy to a temperature between the melting point of said alloy and 900 C.
  • a method according to claim 2 wherein the step of cooling the alloy melt to a temperature below the melting point of the alloy comprises casting the alloy melt into cooled moulds.
  • step of preparing the alloy melt comprises dispersing titanium diboride in molten aluminum.
  • step of preparing the alloy melt comprises adding titanium and boron to molten aluminum at a temperature above about l,200 C.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Continuous Casting (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
US00137986A 1970-04-28 1971-04-27 Method for producing a master alloy for use in aluminum casting processes Expired - Lifetime US3785807A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE05881/70A SE349331B (xx) 1970-04-28 1970-04-28

Publications (1)

Publication Number Publication Date
US3785807A true US3785807A (en) 1974-01-15

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Family Applications (1)

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US00137986A Expired - Lifetime US3785807A (en) 1970-04-28 1971-04-27 Method for producing a master alloy for use in aluminum casting processes

Country Status (9)

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US (1) US3785807A (xx)
BE (1) BE766421A (xx)
CA (1) CA941170A (xx)
DE (1) DE2119516C3 (xx)
FR (1) FR2090888A5 (xx)
GB (1) GB1333957A (xx)
NL (1) NL176376C (xx)
NO (1) NO130016B (xx)
SE (1) SE349331B (xx)

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3961995A (en) * 1973-04-04 1976-06-08 Aluminum Pechiney Mother alloy of aluminum, titanium and boron and process for fabrication
US4298408A (en) * 1980-01-07 1981-11-03 Cabot Berylco Inc. Aluminum-titanium-boron master alloy
FR2568589A1 (fr) * 1984-08-02 1986-02-07 Cabot Corp Affineur de grain d'aluminium contenant des cristaux doubles
DE3608713A1 (de) * 1985-03-25 1986-10-09 Cabot Corp., Boston, Mass. Silicium enthaltender kornverbesserer fuer aluminium
US4751048A (en) * 1984-10-19 1988-06-14 Martin Marietta Corporation Process for forming metal-second phase composites and product thereof
US4772452A (en) * 1986-12-19 1988-09-20 Martin Marietta Corporation Process for forming metal-second phase composites utilizing compound starting materials
US4800065A (en) * 1986-12-19 1989-01-24 Martin Marietta Corporation Process for making ceramic-ceramic composites and products thereof
GB2162540B (en) * 1984-06-22 1989-05-04 Cabot Corp Aluminum grain refiner containing "duplex" crystals
US4915908A (en) * 1984-10-19 1990-04-10 Martin Marietta Corporation Metal-second phase composites by direct addition
US4915902A (en) * 1984-10-19 1990-04-10 Martin Marietta Corporation Complex ceramic whisker formation in metal-ceramic composites
US4916030A (en) * 1984-10-19 1990-04-10 Martin Marietta Corporation Metal-second phase composites
US4917964A (en) * 1984-10-19 1990-04-17 Martin Marietta Corporation Porous metal-second phase composites
US4985202A (en) * 1984-10-19 1991-01-15 Martin Marietta Corporation Process for forming porous metal-second phase composites
US5028301A (en) * 1989-01-09 1991-07-02 Townsend Douglas W Supersaturation plating of aluminum wettable cathode coatings during aluminum smelting in drained cathode cells
US5055256A (en) * 1985-03-25 1991-10-08 Kb Alloys, Inc. Grain refiner for aluminum containing silicon
US5057150A (en) * 1989-05-03 1991-10-15 Alcan International Limited Production of aluminum master alloy rod
US5217816A (en) * 1984-10-19 1993-06-08 Martin Marietta Corporation Metal-ceramic composites
US5227045A (en) * 1989-01-09 1993-07-13 Townsend Douglas W Supersaturation coating of cathode substrate
DE4327227A1 (de) * 1993-08-13 1995-02-16 Schaedlich Stubenrauch Juergen Kornfeinungsmittel, seine Herstellung und Verwendung
US5415708A (en) * 1993-06-02 1995-05-16 Kballoys, Inc. Aluminum base alloy and method for preparing same
US5453244A (en) * 1992-07-16 1995-09-26 Daido Metal Company Ltd. Aluminum alloy bearing
US6073677A (en) * 1995-11-21 2000-06-13 Opticast Ab Method for optimization of the grain refinement of aluminum alloys
WO2001036700A1 (en) * 1999-09-10 2001-05-25 Sigworth Geoffrey K Method for grain refinement of high strength aluminum casting alloys
WO2001042521A1 (de) * 1999-12-10 2001-06-14 Alcan Technology & Management Ltd. Verfahren zur herstellung einer aluminium-titan-bor-vorlegierung als kornfeinungsmittel
US20030179846A1 (en) * 1999-09-09 2003-09-25 Mitsubishi Heavy Industries, Ltd. Aluminum composite material, manufacturing method therefor, and basket and cask using the same
US6645321B2 (en) 1999-09-10 2003-11-11 Geoffrey K. Sigworth Method for grain refinement of high strength aluminum casting alloys
WO2007052174A1 (en) 2005-11-02 2007-05-10 Tubitak Process for producing a grain refining master alloy
CN102978481A (zh) * 2012-11-21 2013-03-20 常州大学 一种高强度高导电硼改性工业纯铝的制备方法
CN102994788A (zh) * 2012-11-21 2013-03-27 常州大学 一种Al-5%Ti中间合金细化纯铝的方法
WO2013072898A2 (en) 2011-11-18 2013-05-23 Tubitak Grain refinement, aluminium foundry alloys
CN107400808A (zh) * 2017-08-10 2017-11-28 兰州理工大学 一种Al‑Ti‑C‑Nb中间合金及其制备方法和应用
CN110358948A (zh) * 2019-06-11 2019-10-22 上海交通大学 一种铝-二硼化钛-磷中间合金及其制备方法

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4873054A (en) * 1986-09-08 1989-10-10 Kb Alloys, Inc. Third element additions to aluminum-titanium master alloys
SE8702149L (sv) * 1987-05-22 1988-11-23 Baeckerud Innovation Ab Aluminiumfoerlegering
ZA938824B (en) * 1992-12-07 1994-06-30 Rheinfelden Aluminium Gmbh Grain refiner for aluminium casting alloys, in particular aluminium-silicon casting alloys.
US5935295A (en) * 1997-10-16 1999-08-10 Megy; Joseph A. Molten aluminum treatment
NO990813L (no) * 1999-02-19 2000-08-21 Hydelko Ks Forlegering for kornforfining av aluminiumslegeringer
US6689489B2 (en) 1999-10-07 2004-02-10 Isg Technologies, Inc. Composition for controlling spangle size, a coated steel product, and a coating method
EP1218563B1 (en) 1999-10-07 2011-04-06 Severstal Sparrows Point, LLC. A coated steel product and a steel product coating method
GB2477744B (en) 2010-02-10 2014-06-04 Aeromet Internat Plc Aluminium-copper alloy for casting
CN105200282A (zh) * 2015-10-30 2015-12-30 苏州天兼新材料科技有限公司 一种新型Mg-Al-TiB2-稀土元素中间合金及其制备方法

Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3961995A (en) * 1973-04-04 1976-06-08 Aluminum Pechiney Mother alloy of aluminum, titanium and boron and process for fabrication
US4298408A (en) * 1980-01-07 1981-11-03 Cabot Berylco Inc. Aluminum-titanium-boron master alloy
GB2162540B (en) * 1984-06-22 1989-05-04 Cabot Corp Aluminum grain refiner containing "duplex" crystals
US4612073A (en) * 1984-08-02 1986-09-16 Cabot Corporation Aluminum grain refiner containing duplex crystals
FR2568589A1 (fr) * 1984-08-02 1986-02-07 Cabot Corp Affineur de grain d'aluminium contenant des cristaux doubles
US5217816A (en) * 1984-10-19 1993-06-08 Martin Marietta Corporation Metal-ceramic composites
US5059490A (en) * 1984-10-19 1991-10-22 Martin Marietta Corporation Metal-ceramic composites containing complex ceramic whiskers
US4751048A (en) * 1984-10-19 1988-06-14 Martin Marietta Corporation Process for forming metal-second phase composites and product thereof
US4985202A (en) * 1984-10-19 1991-01-15 Martin Marietta Corporation Process for forming porous metal-second phase composites
US4917964A (en) * 1984-10-19 1990-04-17 Martin Marietta Corporation Porous metal-second phase composites
US4916030A (en) * 1984-10-19 1990-04-10 Martin Marietta Corporation Metal-second phase composites
US4915908A (en) * 1984-10-19 1990-04-10 Martin Marietta Corporation Metal-second phase composites by direct addition
US4915902A (en) * 1984-10-19 1990-04-10 Martin Marietta Corporation Complex ceramic whisker formation in metal-ceramic composites
GB2174103B (en) * 1985-03-25 1989-06-21 Cabot Corp Grain refiner for aluminum containing silicon
US5055256A (en) * 1985-03-25 1991-10-08 Kb Alloys, Inc. Grain refiner for aluminum containing silicon
GB2174103A (en) * 1985-03-25 1986-10-29 Cabot Corp Grain refiner for aluminum containing silicon
DE3608713A1 (de) * 1985-03-25 1986-10-09 Cabot Corp., Boston, Mass. Silicium enthaltender kornverbesserer fuer aluminium
US4772452A (en) * 1986-12-19 1988-09-20 Martin Marietta Corporation Process for forming metal-second phase composites utilizing compound starting materials
US4800065A (en) * 1986-12-19 1989-01-24 Martin Marietta Corporation Process for making ceramic-ceramic composites and products thereof
US5028301A (en) * 1989-01-09 1991-07-02 Townsend Douglas W Supersaturation plating of aluminum wettable cathode coatings during aluminum smelting in drained cathode cells
US5227045A (en) * 1989-01-09 1993-07-13 Townsend Douglas W Supersaturation coating of cathode substrate
US5057150A (en) * 1989-05-03 1991-10-15 Alcan International Limited Production of aluminum master alloy rod
US5453244A (en) * 1992-07-16 1995-09-26 Daido Metal Company Ltd. Aluminum alloy bearing
US5484493A (en) * 1993-06-02 1996-01-16 Kb Alloys, Inc. Aluminum base alloy
US5415708A (en) * 1993-06-02 1995-05-16 Kballoys, Inc. Aluminum base alloy and method for preparing same
DE4327227A1 (de) * 1993-08-13 1995-02-16 Schaedlich Stubenrauch Juergen Kornfeinungsmittel, seine Herstellung und Verwendung
US6073677A (en) * 1995-11-21 2000-06-13 Opticast Ab Method for optimization of the grain refinement of aluminum alloys
US20030179846A1 (en) * 1999-09-09 2003-09-25 Mitsubishi Heavy Industries, Ltd. Aluminum composite material, manufacturing method therefor, and basket and cask using the same
US7177384B2 (en) * 1999-09-09 2007-02-13 Mitsubishi Heavy Industries, Ltd. Aluminum composite material, manufacturing method therefor, and basket and cask using the same
WO2001036700A1 (en) * 1999-09-10 2001-05-25 Sigworth Geoffrey K Method for grain refinement of high strength aluminum casting alloys
US6368427B1 (en) 1999-09-10 2002-04-09 Geoffrey K. Sigworth Method for grain refinement of high strength aluminum casting alloys
US6645321B2 (en) 1999-09-10 2003-11-11 Geoffrey K. Sigworth Method for grain refinement of high strength aluminum casting alloys
WO2001042521A1 (de) * 1999-12-10 2001-06-14 Alcan Technology & Management Ltd. Verfahren zur herstellung einer aluminium-titan-bor-vorlegierung als kornfeinungsmittel
US20030075020A1 (en) * 1999-12-10 2003-04-24 Walter Hotz Method for producing an aluminum-titanium-boron prealloy for use as a grain refiner
EP1114875A1 (de) * 1999-12-10 2001-07-11 Alusuisse Technology & Management AG Verfahren zur Herstellung einer Aluminium-Titan-Bor-Vorlegierung als Kornfeinungsmittel
WO2007052174A1 (en) 2005-11-02 2007-05-10 Tubitak Process for producing a grain refining master alloy
WO2013072898A2 (en) 2011-11-18 2013-05-23 Tubitak Grain refinement, aluminium foundry alloys
CN102978481A (zh) * 2012-11-21 2013-03-20 常州大学 一种高强度高导电硼改性工业纯铝的制备方法
CN102994788A (zh) * 2012-11-21 2013-03-27 常州大学 一种Al-5%Ti中间合金细化纯铝的方法
CN102978481B (zh) * 2012-11-21 2015-06-03 常州大学 一种高强度高导电硼改性工业纯铝的制备方法
CN107400808A (zh) * 2017-08-10 2017-11-28 兰州理工大学 一种Al‑Ti‑C‑Nb中间合金及其制备方法和应用
CN107400808B (zh) * 2017-08-10 2019-03-29 兰州理工大学 一种Al-Ti-C-Nd中间合金及其制备方法和应用
CN110358948A (zh) * 2019-06-11 2019-10-22 上海交通大学 一种铝-二硼化钛-磷中间合金及其制备方法

Also Published As

Publication number Publication date
CA941170A (en) 1974-02-05
BE766421A (fr) 1971-09-16
DE2119516B2 (de) 1979-08-16
DE2119516C3 (de) 1980-04-24
SE349331B (xx) 1972-09-25
GB1333957A (en) 1973-10-17
NO130016B (xx) 1974-06-24
NL7105406A (xx) 1971-11-01
DE2119516A1 (de) 1971-11-11
NL176376C (nl) 1985-04-01
FR2090888A5 (xx) 1972-01-14

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AS Assignment

Owner name: BACKERUD INNOVATION AB, BOX 5035, S-181 05 LIDINGO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GRANGES ALUMINIUM AB,;REEL/FRAME:004205/0558

Effective date: 19831118