EP1242641A1 - Verfahren zur herstellung einer aluminium-titan-bor-vorlegierung als kornfeinungsmittel - Google Patents
Verfahren zur herstellung einer aluminium-titan-bor-vorlegierung als kornfeinungsmittelInfo
- Publication number
- EP1242641A1 EP1242641A1 EP00983193A EP00983193A EP1242641A1 EP 1242641 A1 EP1242641 A1 EP 1242641A1 EP 00983193 A EP00983193 A EP 00983193A EP 00983193 A EP00983193 A EP 00983193A EP 1242641 A1 EP1242641 A1 EP 1242641A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- melt
- master alloy
- aluminum
- particles
- tib
- 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.)
- Granted
Links
Classifications
-
- 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
- C22C1/026—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 invention relates to a process for producing a refining agent based on an aluminum-titanium-boron master alloy by introducing Ti and B-containing starting materials into an aluminum melt to form TiB 2 particles and allowing this master alloy melt to solidify.
- EP-A-0396389 discloses a process for the continuous production of an Al-Ti-B refining alloy, in which Ti and B-containing starting materials are added in a reaction zone to an aluminum melt, the melt being stirred in the reaction zone. A mixture of the alloy formed is continuously fed together with the reaction products to a cleaning zone in which the slag with reaction products is collected on the surface of the melt and removed. The formed refining alloy is continuously fed from the cleaning station to a casting station, in which the melt is continuously cast into a strand.
- the cast strand can either have the desired strand or wire thickness directly, or it can be processed into the desired grain refining material by further processing by rolling or extrusion.
- the TiB particles in the Al-Ti-B refining agents known today have a strong tendency to form agglomerates. This results in a reduced effect of the grain refining agent. Further disadvantages result from agglomerates and inclusions, which can lead to errors in the end product. Examples include gray lines, holes, material separations and stringers.
- agglomerates occur preferentially on low-melting salts such as KF and NaCl as well as on oxide skins and can thereby further increase.
- the agglomerates as such are "soft", can force themselves through filters and as such end up in a cast strand.
- the invention is therefore based on the object of providing a process for producing an Al-Ti-B grain refining agent with which the formation of agglomerates of TiB 2 particles can be largely prevented and existing agglomerates can be deagglomerated.
- the object is achieved in a method of the type mentioned above in that the master alloy between the liquidus temperature of the Al 3 Ti phase and the solidus temperature of the master alloy is set in motion for a sufficient period of time for the dispersion of the TiB 2 particles in the melt and simultaneously with is cooled at a first cooling rate, so that the TiB 2 particles act as nuclei for the Al 3 Ti phase that arises below the liquidus temperature and the surface of the TiB 2 particles are at least partially covered with a coating of Al 3 Ti, and that the master alloy is subsequently cooled below the solidus temperature of the master alloy with a second cooling rate that is higher than the first cooling rate.
- moving the melt is understood to mean all process steps which are suitable for preventing the formation of agglomerates of TiB 2 - Largely prevent particles and deagglomerate existing agglomerates. These include mechanical stirring and vibrating processes with high revolutions of the agitator as well as the generation of cavitation, ie the formation of bubbles, the implosion of which creates shock waves that lead to the deagglomeration of agglomerated particles.
- the latter methods include, for example, ultrasound treatment and vibration using a magnetohydrodynamic resonator.
- the refining agent produced by the process according to the invention brings about an improved and more homogeneous effect of the refining agent, particularly in the refining of casting formats made of aluminum alloys, through a more homogeneous distribution of the individual TiB 2 particles, a better coating of the TiB 2 particles with Al 3 Ti phase and one Reduction or dispersion of any salts and oxide inclusions that may still be present in the refining agent.
- the master alloy is preferably set in motion before the liquid temperature of the Al 3 Ti phase is fallen below.
- the effect of the refining agent produced according to the invention is shown by the fact that the individual, approximately 0.5 to 5 ⁇ m large TiB 2 particles have an excellent germination effect as a result of a coating formed from a thin Al 3 Ti layer, and the particles are isolated and not as agglomerates act so that a comparable refinement can be achieved with a significantly smaller amount of refinement than with grain refiners according to the prior art.
- the liquidus temperature of the Al 3 Ti phase may be dropped below prematurely. This is particularly the case when a master alloy with a high Ti content and a correspondingly higher liquidus temperature is produced or when a master alloy that has already solidified is assumed.
- any Al 3 Ti particles that have already precipitated can be completely dissolved again. This process typically takes 5 to 60 minutes, depending on the size of the Al 3 Ti particles.
- the movement of the melt is generated by means of sound, preferably by means of ultrasound, the melt being expediently sonicated at a frequency of 50 Hz to 50 kHz, preferably at least 10 to 30 kHz.
- the second cooling rate is preferably greater than 1 ° C / sec, in particular greater than 5 ° C / sec and particularly preferably greater than 10 ° C / sec.
- the master alloy melt can be cast into any format.
- a strand which is expediently produced by vertical or horizontal continuous casting is preferred.
- This strand can either already be cast in the format of the rod or wire material desired as a refining agent or can be processed into rod or wire material in a further operation by rolling or pressing.
- Vertically cast, large-sized strands are mainly processed by extrusion.
- Horizontal continuous casting of formats with a relatively small diameter is preferred, since this process allows continuous production.
- the horizontally cast continuous casting formats are preferably processed by rolling to the desired rod or wire material.
- a master alloy produced using the method according to the invention has a composition whose total titanium content exceeds the stoichiometric ratio of TiB 2 .
- a preferred alloy used contains titanium and boron in a weight ratio of 5: 2 to 10: 1.
- the process is suitable for the production of master alloys with 0.15 to 20% by weight of titanium and 0.01 to 4% by weight of boron, it has proven to be advantageous if the master alloy contains 0.3 to 5, preferably 0.5 to 2,% by weight. % Ti and 0.02 to 1, preferably 0.05 to 0.5 wt .-% B contains.
- the method according to the invention is particularly suitable for the production of refining agents for the refining of aluminum and aluminum alloys.
- the Al-Ti equilibrium diagram shown in FIG. 1 shows the schematically illustrated process sequence for producing an Al-Ti-B master alloy for refining aluminum alloys.
- a master alloy produced by the process according to the invention with a composition corresponding to AITi0.7B0.1, which contains about 0.5% titanium not bound to boron, has an initial temperature of about 840 ° C. and is therefore above that for this alloy composition at about 800 ° C. lying liquidus temperature T A ß ⁇ i of the AI 3 Ti phase.
- the graphic representation A of the alloy phases to the left of the 0.5% Ti line shows the processes during the preparation of an already solidified master alloy, the representation B to the right of the 0.5% Ti line the processes during the solidification of the master alloy.
- the master alloy melt contains TiB 2 particles in partially agglomerated form. Even before the liquidus temperature T L A i3Ti is undershot and until shortly before the solidus temperature T s v of the pre-alloy of the AI 3 Ti phase is reached, the partially agglomerated TiB 2 particles are subjected to a strong melt movement using ultrasound treatment at a frequency of, for example, 25 kHz deagglomerated and homogeneously distributed.
- Simultaneous controlled cooling with a first cooling speed Vi of, for example, 0.5 ° C./sec causes the deposition of a thin layer of the Al 3 Ti phase on the parallel surfaces of the TiB 2 particles and at the same time prevents the formation of coarse-grained Al 3 Ti particles .
- a second cooling speed v 2 higher than the first cooling speed vi of, for example, 10 ° C./sec below the solidus temperature T s v of the master alloy it is ensured that the Al 3 Ti layer does not adhere to the TiB 2 particles completely dissolves and no further formation or coarsening of Al 3 Ti particles occurs.
- a system 10 shown in FIG. 2 for producing an Al-Ti-B master alloy for refining aluminum alloys comprises a reaction vessel 12 with an inlet channel 14 in its upper region and an outlet channel 16 in its lower region.
- the reaction vessel 12 is surrounded by an induction motor 18 as an electromagnetic stirring device with which the aluminum melt 20 located in the reaction vessel 12 is stirred vigorously to form a vortex 22.
- Ti- and B-containing salts such as K 2 TiF 6 and KBF 4 are guided in the direction of arrow 24 into the vortex 22, which draws the salts into the aluminum melt 20.
- the aluminum melt 20 with the reaction products is subsequently passed through the outlet channel 16 via a further inlet channel 26 into the upper one
- An aftertreatment boiler 28 Area of an aftertreatment boiler 28 out.
- Another electronic Magnetic stirring device 30 in the lower region of the aftertreatment boiler 28 leads to a lower turbulent zone 32 and an upper calming zone 34.
- the slag 36 formed by reaction products is removed from the aftertreatment boiler 28 via the removal opening 38.
- the cleaned aluminum melt 20 with the elements titanium and boron contained therein is fed as a pre-alloy in the lower region of the aftertreatment boiler 28 via a casting trough 38 to a mold, not shown in the drawing, of a horizontal continuous casting machine.
- Two ultrasonic transmitters 40, 42 are arranged in the region of the casting trough 38, the sonotrodes 44, 46 of which immerse in the melt.
- An induction heater 48 arranged below the casting trough 38 serves to heat the melt if its temperature should have already dropped below the liquidus temperature T L A ⁇ 3 ⁇ i of the AI 3 Ti phase when the melt flows into the casting trough 38 into the casting trough 38.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00983193A EP1242641B1 (de) | 1999-12-10 | 2000-11-30 | Verfahren zur herstellung einer aluminium-titan-bor-vorlegierung als kornfeinungsmittel |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99811137 | 1999-12-10 | ||
EP99811137A EP1114875A1 (de) | 1999-12-10 | 1999-12-10 | Verfahren zur Herstellung einer Aluminium-Titan-Bor-Vorlegierung als Kornfeinungsmittel |
PCT/EP2000/012015 WO2001042521A1 (de) | 1999-12-10 | 2000-11-30 | Verfahren zur herstellung einer aluminium-titan-bor-vorlegierung als kornfeinungsmittel |
EP00983193A EP1242641B1 (de) | 1999-12-10 | 2000-11-30 | Verfahren zur herstellung einer aluminium-titan-bor-vorlegierung als kornfeinungsmittel |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1242641A1 true EP1242641A1 (de) | 2002-09-25 |
EP1242641B1 EP1242641B1 (de) | 2004-02-18 |
Family
ID=8243179
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99811137A Withdrawn EP1114875A1 (de) | 1999-12-10 | 1999-12-10 | Verfahren zur Herstellung einer Aluminium-Titan-Bor-Vorlegierung als Kornfeinungsmittel |
EP00983193A Expired - Lifetime EP1242641B1 (de) | 1999-12-10 | 2000-11-30 | Verfahren zur herstellung einer aluminium-titan-bor-vorlegierung als kornfeinungsmittel |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99811137A Withdrawn EP1114875A1 (de) | 1999-12-10 | 1999-12-10 | Verfahren zur Herstellung einer Aluminium-Titan-Bor-Vorlegierung als Kornfeinungsmittel |
Country Status (5)
Country | Link |
---|---|
US (1) | US20030075020A1 (de) |
EP (2) | EP1114875A1 (de) |
CA (1) | CA2394485A1 (de) |
DE (1) | DE50005366D1 (de) |
WO (1) | WO2001042521A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109371277A (zh) * | 2018-12-11 | 2019-02-22 | 徐州宁铝业科技有限公司 | 一种用于铝合金熔炼的精炼剂及制备方法 |
WO2021007893A1 (zh) * | 2019-07-12 | 2021-01-21 | 东北大学 | 一种铝-钛-硼细化剂板带的制备工艺 |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TR200504376A2 (tr) * | 2005-11-02 | 2008-05-21 | T�B�Tak-T�Rk�Ye B�L�Msel Ve Tekn�K Ara�Tirma Kurumu | Tane küçültücü ön alaşım üretmek için bir proses |
CN101768708B (zh) * | 2010-02-05 | 2012-05-23 | 深圳市新星轻合金材料股份有限公司 | 通过控制压缩比来控制铝钛硼合金晶粒细化能力的变化量的方法 |
CN105671350A (zh) * | 2015-03-19 | 2016-06-15 | 中信戴卡股份有限公司 | 一种铝合金细化剂、其制备方法及用途 |
EP3162460A1 (de) | 2015-11-02 | 2017-05-03 | Mubea Performance Wheels GmbH | Leichtmetallgussbauteil und verfahren zum herstellen eines leichtmetallgussbauteils |
RU2625375C2 (ru) * | 2015-12-03 | 2017-07-13 | Федеральное государственное бюджетное учреждение науки Институт металлургии Уральского отделения Российской академии наук (ИМЕТ УрО РАН) | Способ получения композиционных сплавов и установка для его осуществления |
CN107377914A (zh) * | 2017-08-04 | 2017-11-24 | 江西金世纪特种焊接材料有限公司 | 一种铝合金焊接材料熔炼连铸设备 |
FR3082763A1 (fr) | 2018-06-25 | 2019-12-27 | C-Tec Constellium Technology Center | Procede de fabrication d une piece en alliage d aluminium |
CN110157935B (zh) * | 2019-06-28 | 2021-05-07 | 上海大学 | 铸造铝硅合金用Al-V-B细化剂、其制备方法及应用 |
CN114959348B (zh) * | 2022-06-09 | 2023-12-05 | 上海大学 | 一种高分散度Al-xMB2细化剂的制备方法和应用方法 |
CN115558821B (zh) * | 2022-12-06 | 2023-03-10 | 北京航空航天大学 | 一种实现TiB2尺寸可控的Al-Ti-B细化剂制备方法 |
CN115976373A (zh) * | 2022-12-30 | 2023-04-18 | 中山瑞泰铝业有限公司 | 一种铝合金材料的加工工艺及其应用 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE349331B (de) * | 1970-04-28 | 1972-09-25 | Svenska Aluminiumkompaniet Ab | |
US4612073A (en) * | 1984-08-02 | 1986-09-16 | Cabot Corporation | Aluminum grain refiner containing duplex crystals |
US5230754A (en) * | 1991-03-04 | 1993-07-27 | Kb Alloys, Inc. | Aluminum master alloys containing strontium, boron, and silicon for grain refining and modifying aluminum alloys |
-
1999
- 1999-12-10 EP EP99811137A patent/EP1114875A1/de not_active Withdrawn
-
2000
- 2000-11-30 EP EP00983193A patent/EP1242641B1/de not_active Expired - Lifetime
- 2000-11-30 CA CA002394485A patent/CA2394485A1/en not_active Abandoned
- 2000-11-30 US US10/148,659 patent/US20030075020A1/en not_active Abandoned
- 2000-11-30 WO PCT/EP2000/012015 patent/WO2001042521A1/de active IP Right Grant
- 2000-11-30 DE DE50005366T patent/DE50005366D1/de not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0142521A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109371277A (zh) * | 2018-12-11 | 2019-02-22 | 徐州宁铝业科技有限公司 | 一种用于铝合金熔炼的精炼剂及制备方法 |
WO2021007893A1 (zh) * | 2019-07-12 | 2021-01-21 | 东北大学 | 一种铝-钛-硼细化剂板带的制备工艺 |
Also Published As
Publication number | Publication date |
---|---|
US20030075020A1 (en) | 2003-04-24 |
EP1242641B1 (de) | 2004-02-18 |
DE50005366D1 (de) | 2004-03-25 |
WO2001042521A8 (de) | 2001-07-12 |
CA2394485A1 (en) | 2001-06-14 |
EP1114875A1 (de) | 2001-07-11 |
WO2001042521A1 (de) | 2001-06-14 |
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