US20090220376A1 - Aluminum alloy free from aluminum carbide - Google Patents

Aluminum alloy free from aluminum carbide Download PDF

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Publication number
US20090220376A1
US20090220376A1 US12/279,107 US27910707A US2009220376A1 US 20090220376 A1 US20090220376 A1 US 20090220376A1 US 27910707 A US27910707 A US 27910707A US 2009220376 A1 US2009220376 A1 US 2009220376A1
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United States
Prior art keywords
aluminum
aluminum alloy
strip
print plate
plate carriers
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Abandoned
Application number
US12/279,107
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English (en)
Inventor
Bernhard Kernig
Werner Droste
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Hydro Aluminium Deutschland GmbH
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Hydro Aluminium Deutschland GmbH
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Publication date
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Application filed by Hydro Aluminium Deutschland GmbH filed Critical Hydro Aluminium Deutschland GmbH
Assigned to HYDRO ALUMINIUM DEUTSCHLAND GMBH reassignment HYDRO ALUMINIUM DEUTSCHLAND GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DROSTE, WERNER, BRINKMAN, HENK-JAN, KERNIG, BERNHARD
Publication of US20090220376A1 publication Critical patent/US20090220376A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00—Obtaining aluminium
    • C22B21/06—Obtaining aluminium refining
    • 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

Definitions

  • the invention relates to an aluminum alloy for producing an aluminum strip for lithographic print plate carriers a method for producing an aluminum alloy for lithographic print plate carriers, in which, during the production of the aluminum alloy, after the electrolysis of the aluminum oxide, the liquid aluminum is supplied to a plurality of purification steps, as well as an aluminum strip for lithographic print plate carriers and a corresponding use of the aluminum strip for lithographic print plate carriers.
  • Print plate carriers for the lithographic print made of an aluminum alloy have to satisfy very high requirements to be suitable for current printing technology.
  • the print plate carrier produced from an aluminum strip has to be able to be roughened homogeneously, with mechanical, chemical and electrochemical roughening methods and a combination thereof being used.
  • the print plates are frequently subjected after exposure and development to a burning-in process at between 220 and 300° C. with an annealing time of 3 to 10 min., in order to harden the photolayer applied.
  • various aluminum alloys have been developed.
  • embodiments of the present invention provide an aluminum alloy for producing an aluminum strip for lithographic print plate carriers and a corresponding aluminum strip for lithographic print plate carriers, from which or with which lithographic print plate carriers can be produced which allow the use of virtually gas-tight coatings.
  • embodiments of the invention provide a method for producing a corresponding aluminum alloy and an advantageous use of the aluminum strip for lithographic print plate carriers.
  • an aluminum alloy has an aluminum carbide content of less than 10 ppm, preferably less than 1 ppm. It has surprisingly been found that print plate carriers, which have been produced from an aluminum alloy with correspondingly low aluminum carbide contents, allow the use of gas-tight coatings as bubble formation is extremely low. It is assumed that the slightest traces of aluminum carbide (Al 4 C 3 ) and the reaction thereof with moisture with the formation of methane gas leads to bubble formation under the gas-tight coatings. It was surprisingly found that in particular the composition of the aluminum alloy of the print plate carrier plays an important role in bubble formation although it had previously been assumed that this was substantially a phenomenon caused by the surface of the print plate carriers.
  • Previous aluminum alloys were therefore not optimized to an aluminum carbide content which was as low as possible. However, it has been shown that even at an aluminum carbide content of less than 10 ppm, bubble formation is considerably reduced and corresponding aluminum alloys can be used to produce suitable print plate carriers.
  • the aluminum carbide content of the aluminum alloy according to an embodiments of the invention is preferably adjusted to less than 1 ppm, so bubble formation is prevented with a gas-tight coating of the print plate carrier.
  • the further composition of the aluminum alloy preferably corresponds to an aluminum alloy of the type AA1xxx, AA3xxx, AA8xxx, preferably AA1050 or AA3103. It is known of said aluminum alloys that they at least partially satisfy the requirements made for lithographic print plate carriers and were previously used to produce them. Owing to the reduction according to the invention of the aluminum carbide content to less than 10 ppm or 1 ppm, the good mechanical, chemical and electrochemical properties of said aluminum alloys can also be utilized in print plate carriers with a gas-tight coating.
  • the aluminum alloy according to the invention may have the following alloying constituents in % by weight:
  • the alternative aluminum alloy which has the following alloying constituents in % by weight:
  • a method in which the proportion of aluminum carbides in the aluminum alloy is lowered by one or more purification step(s) to less than 10 ppm, preferably to less than 1 ppm.
  • the purification steps of aluminum alloys previously aimed to reduce other impurities, such as, for example, alkaline earth metals or alkali metals, the aluminum carbides also being removed from the aluminum melt, of course.
  • the aluminum carbide contents of the conventionally produced aluminum alloys were consequently clearly above the values according to the invention.
  • the liquid aluminum is preferably supplied to a stirring station, in which inert gases are introduced into the liquid aluminum whilst stirring, the duration of the stirring and blowing-in of the inert gas into the aluminum melt in the stirring station being at least 10 min., preferably 15 min. It was previously known that substantially the alkali metals and alkaline earth metals are removed from the aluminum melt in the stirring station with the blowing-in of inert gases and stirring. For this purpose, stirring and gassing times of typically 6 to 8 minutes were sufficient.
  • a reduction in the aluminum carbide content of the molten aluminum is produced in that the liquid aluminum supplied to the stirring station has been obtained at least partially from cold metal.
  • Cold metal is aluminum which has already come from electrolysis of aluminum oxide, and which has passed through several method steps after the electrolysis, for example including a stirring station.
  • the aluminum carbide content of the cold metal supplied is therefore typically substantially lower than that of liquid aluminum originating from the electrolysis. It is assumed that the burn-off of the graphite electrodes used in the electrolysis contributes to the aluminum carbide content of the aluminum melt produced from aluminum oxide.
  • the aluminum carbide content of the aluminum alloy according to the invention is additionally further reduced in that when stirring the liquid aluminum in the stirring station, aluminum fluorides are added. These remove the alkali metals sodium, calcium and lithium but also, by means of oxidation, in particular elements such as titanium and phosphorous. At the same time, however, it was possible to establish that the aluminum carbide content of the aluminum melt is also reduced.
  • the aluminum is supplied to a furnace to add the alloying constituents, the aluminum being left to stand in the furnace for at least more than 30 min., preferably at least more than 60 min., after which by stirring and the addition of the alloying constituents, the alloying has taken place in the furnace. It is thereby achieved that the aluminum carbide compounds generally contained in gas bubbles of the gas previously introduced into the aluminum melt can migrate together therewith to the surface of the aluminum melt and form there a part of the dross to be removed from the melt.
  • a further removal of undesired substances from the aluminum melt, in particular including aluminum carbide compounds, is achieved in that the aluminum alloy is supplied to a rotor degassing and flushed with a mixture of inert and/or reactive gases, in particular argon, nitrogen and/or chlorine.
  • a rotor degassing By means of this rotor degassing, the aluminum carbide compounds which have arrived in the aluminum melt during the addition of the alloying constituents, as well as other undesired compounds, can be removed from the melt of the aluminum alloy.
  • the aluminum alloy can be subjected to at least one segregation step, in which the aluminum alloy is heated to slightly above the solidus temperature of the aluminum alloy, so that melted, heavily contaminated phases can be pressed out of the aluminum alloy.
  • These heavily contaminated phases of the aluminum alloy additionally contain aluminum carbide compounds, which can be removed in this manner from the aluminum melt.
  • embodiments of the invention can feature methods used to produce an aluminum alloy for lithographic print plate carriers and include a reduction in the aluminum carbide content in that the aluminum alloy is filtered before the continuous or strip casting, the filter having a high filter effectiveness for particles with a size of less than or equal to 5 ⁇ m. It is obvious that the filter effectiveness of these filters is also high for larger particles with a size of significantly more than 5 ⁇ m. It was established that the aluminum carbides are generally primarily present in contamination particles with a size of more than 10 ⁇ m, so by filtering the aluminum alloy, an additional reduction in the aluminum carbide content is achieved.
  • two-stage filters are used, for example, which consist of a first ceramic foam filter with a downstream deep bed filter.
  • grain refining material can preferably take place between the two filters to ensure as high an effectivity as possible of the ceramic foam filter by the building of a filter cake, and to ensure a long service life of the downstream deep bed filter.
  • an aluminum strip for lithographic print plate carriers is produced by continuous or discontinuous casting of an aluminum alloy according to the invention with subsequent hot and/or cold forming, the aluminum alloy according to the invention having been produced in particular using the method according to the invention.
  • the aluminum strip according to the invention then consists of a material which is extremely low in aluminum carbide, so that it is ideally suited for producing print plate carriers with a gas-tight coating.
  • An aluminum strip with only a few aluminum carbide compounds on the surface thereof and in the core material can be provided in that the rolling oil residues on the aluminum strip for lithographic print plate carriers have been removed by annealing and degreasing the strip.
  • the aluminum strip can be subjected to a first degreasing using an acid or alkaline medium and then subjected to further purification using a pickling process, so that the removal of aluminum carbide on the surface is even more thorough.
  • An aluminum strip can thus be provided with a further reduced quantity of aluminum carbide compounds on the surface thereof.
  • the aluminum alloy of the aluminum strip according to the invention itself has very low proportions of aluminum carbide compounds, so that in combination with the then virtually aluminum carbide-free surface of the aluminum strip, an aluminum strip for lithographic print plate carriers, which is ideal for coating with gas-tight coatings, is provided.
  • the aluminum strip according to the invention is used to produce lithographic print plate carriers with a gas-tight coating.
  • FIGURE in the drawings schematically shows the sequence of the individual method steps for producing an exemplary embodiment of an aluminum alloy according to the invention.
  • the production of an aluminum alloy according to the invention begins with an electrolysis 1 of aluminum oxide.
  • the liquid aluminum is then supplied to a stirring station 2 and, alternatively to or accumulatively with respect to the aluminum obtained directly from aluminum oxide, as shown in the FIGURE, cold metal 3 can be supplied to the stirring station.
  • the cold metal contains, as already described above, less aluminum carbide than an aluminum melt produced directly from aluminum oxide, as the latter additionally contains carbon compounds owing to the burning-off of the graphite electrodes and therefore also aluminum carbide.
  • the introduction of inert gases or a gas mixture and the stirring is carried out longer than conventionally provided in the stirring station 2 .
  • the minimal gassing and stirring time should be between 10 and 20 min. However, longer stirring and gassing times may also be established.
  • the aluminum melt is then supplied to a furnace 4 . Gas flushing with reactive and/or inert gases is then carried out in the furnace 4 and the alloying constituents are added. The gas flushings lead to a further reduction in the aluminum carbide content in the aluminum melt.
  • the aluminum alloy is then left to stand in the furnace for a certain period of time so that the gas bubbles previously released in the melt have enough time to arrive at the surface of the aluminum melt.
  • the melt can be left to stand in the furnace for a time period of between 15 and 90 min., preferably of 30 to 60 min.
  • the gas bubbles which have arrived at the surface of the aluminum melt during the gas flushing with reactive and/or inert gases are skimmed from the melt by removing the dross of the aluminum alloy and thus removed from the aluminum alloy.
  • the dross then contains the aluminum carbides flushed out from the aluminum melt.
  • the liquid aluminum alloy is supplied to a rotor degassing 5 , which operates, for example, by the SNIF method (spinning nozzle inert flotation), for example flushed with argon and/or chlorine.
  • the contaminants are in turn flushed to the bath surface by the fine gas bubbles, the feeding-in of chlorine, in particular, causing the binding of sodium and potassium contaminants to form salts, which are then deposited with the gas bubbles in a dross layer on the aluminum alloy. The dross layer is then removed again.
  • the aluminum alloy according to the invention prior to the casting, is preferably subjected to a filtering with a filter 6 , which has a high filter effectiveness for particles with a size of less than or equal to 5 ⁇ m.
  • filters 6 with a filter effectiveness of at least 50% for these particles may be used.
  • the aluminum carbide content of the aluminum alloy can effectively be further reduced by the filter step.
  • the aluminum alloy can then be supplied to a continuous or discontinuous casting method 7 , 8 .
  • the aluminum alloy can be subjected to at least one segregation step in a segregation station, not shown, in which the aluminum alloy is heated to a temperature just above the solidus temperature of the aluminum alloy. Heavily contaminated phases of the aluminum melt below the solidus temperature, so that these can be pressed out and removed from the aluminum melt. As the contaminated phases generally also contain aluminum carbides, the proportion thereof in the aluminum alloy according to the invention is further reduced by the optional segregation.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Printing Plates And Materials Therefor (AREA)
US12/279,107 2006-02-13 2007-02-13 Aluminum alloy free from aluminum carbide Abandoned US20090220376A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP06002809.9 2006-02-13
EP06002809.9A EP1820866B2 (de) 2006-02-13 2006-02-13 Aluminiumcarbidfreie Aluminiumlegierung
PCT/EP2007/051404 WO2007093605A1 (de) 2006-02-13 2007-02-13 Aluminiumcarbidfreie aluminiumlegierung

Publications (1)

Publication Number Publication Date
US20090220376A1 true US20090220376A1 (en) 2009-09-03

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US12/279,107 Abandoned US20090220376A1 (en) 2006-02-13 2007-02-13 Aluminum alloy free from aluminum carbide
US13/423,602 Active US8869875B2 (en) 2006-02-13 2012-03-19 Aluminum alloy free from aluminum carbide

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US13/423,602 Active US8869875B2 (en) 2006-02-13 2012-03-19 Aluminum alloy free from aluminum carbide

Country Status (6)

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US (2) US20090220376A1 (zh)
EP (1) EP1820866B2 (zh)
CN (1) CN101405415B (zh)
BR (1) BRPI0707735B8 (zh)
ES (1) ES2524005T5 (zh)
WO (1) WO2007093605A1 (zh)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110039092A1 (en) * 2009-08-13 2011-02-17 Shinya Kurokawa Aluminum sheet material for lithographic printing plates
EP2426227A1 (en) 2010-09-03 2012-03-07 Fujifilm Corporation Aluminum alloy sheet forlithographic printing plate, and manufacturing method thereof
US11280292B2 (en) 2014-05-14 2022-03-22 Federal-Mogul Nurnberg Gmbh Method for producing an engine component, engine component, and use of an aluminum alloy

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101321882B (zh) † 2005-10-19 2011-09-21 海德鲁铝业德国有限责任公司 用于石版印刷板支持体的铝带
US9068246B2 (en) * 2008-12-15 2015-06-30 Alcon Inc. Decarbonization process for carbothermically produced aluminum
CN105039810B (zh) 2009-05-08 2019-07-05 诺夫利斯公司 铝平版印刷片
WO2012059362A1 (en) 2010-11-04 2012-05-10 Novelis Inc. Aluminium lithographic sheet
US20200071825A1 (en) * 2018-08-28 2020-03-05 Applied Materials, Inc. Methods Of Depositing Metal Carbide Films

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US510743A (en) * 1893-12-12 Trunk
US1743515A (en) * 1928-05-01 1930-01-14 Fairmont Mfg Company Process of treating aluminum with halogen gases
US3721546A (en) * 1966-07-13 1973-03-20 Showa Denko Kk Method for production of aluminum
US4003738A (en) * 1972-04-03 1977-01-18 Ethyl Corporation Method of purifying aluminum
US6447982B1 (en) * 1999-07-02 2002-09-10 Vaw Aluminium Ag Litho strip and method for its manufacture
US20040047759A1 (en) * 2000-12-11 2004-03-11 Theodor Rottwinkel Aluminium alloy for lithographic sheet
US20040173053A1 (en) * 2003-03-06 2004-09-09 Aune Jan Arthur Method and reactor for production of aluminum by carbothermic reduction of alumina
US20050013724A1 (en) * 2003-05-30 2005-01-20 Hiroshi Ougi Aluminum alloy sheet for lithographic printing plate

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JPH01247547A (ja) 1988-03-29 1989-10-03 Showa Alum Corp フッ素樹脂塗装用アルミニウム合金
JPH03222796A (ja) 1990-01-30 1991-10-01 Nippon Light Metal Co Ltd 平版印刷版用アルミニウム支持体
JP3915944B2 (ja) 1997-08-22 2007-05-16 古河スカイ株式会社 平版印刷版用アルミニウム合金支持体の製造方法および平版印刷版用アルミニウム合金支持体
JP3465624B2 (ja) 1999-04-23 2003-11-10 日本軽金属株式会社 溶湯への気泡分散装置
CN100457471C (zh) * 2000-03-28 2009-02-04 富士胶片株式会社 平版印刷版用支撑体
JP3882987B2 (ja) * 2000-07-11 2007-02-21 三菱アルミニウム株式会社 平版印刷版用アルミニウム合金板
CN1218840C (zh) * 2001-01-22 2005-09-14 富士胶片株式会社 平版印刷版用支撑体、其制造方法以及平版印刷版原版
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JP2004292862A (ja) 2003-03-26 2004-10-21 Furukawa Sky Kk 平版印刷版用アルミニウム合金支持体およびその製造方法
CN101321882B (zh) † 2005-10-19 2011-09-21 海德鲁铝业德国有限责任公司 用于石版印刷板支持体的铝带

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US510743A (en) * 1893-12-12 Trunk
US1743515A (en) * 1928-05-01 1930-01-14 Fairmont Mfg Company Process of treating aluminum with halogen gases
US3721546A (en) * 1966-07-13 1973-03-20 Showa Denko Kk Method for production of aluminum
US4003738A (en) * 1972-04-03 1977-01-18 Ethyl Corporation Method of purifying aluminum
US6447982B1 (en) * 1999-07-02 2002-09-10 Vaw Aluminium Ag Litho strip and method for its manufacture
US20040047759A1 (en) * 2000-12-11 2004-03-11 Theodor Rottwinkel Aluminium alloy for lithographic sheet
US20040173053A1 (en) * 2003-03-06 2004-09-09 Aune Jan Arthur Method and reactor for production of aluminum by carbothermic reduction of alumina
US20050013724A1 (en) * 2003-05-30 2005-01-20 Hiroshi Ougi Aluminum alloy sheet for lithographic printing plate

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110039092A1 (en) * 2009-08-13 2011-02-17 Shinya Kurokawa Aluminum sheet material for lithographic printing plates
US8828156B2 (en) * 2009-08-13 2014-09-09 Fujifilm Corporation Aluminum sheet material for lithographic printing plates
EP2426227A1 (en) 2010-09-03 2012-03-07 Fujifilm Corporation Aluminum alloy sheet forlithographic printing plate, and manufacturing method thereof
US20120134875A1 (en) * 2010-09-03 2012-05-31 Furukawa-Sky Aluminum Corp. Aluminum alloy sheet for lithographic printing plate, and manufacturing method thereof
US11280292B2 (en) 2014-05-14 2022-03-22 Federal-Mogul Nurnberg Gmbh Method for producing an engine component, engine component, and use of an aluminum alloy

Also Published As

Publication number Publication date
US8869875B2 (en) 2014-10-28
ES2524005T5 (es) 2018-12-10
CN101405415B (zh) 2011-01-12
BRPI0707735B1 (pt) 2017-03-28
BRPI0707735A2 (pt) 2011-05-10
EP1820866B1 (de) 2014-08-20
ES2524005T3 (es) 2014-12-03
EP1820866A1 (de) 2007-08-22
CN101405415A (zh) 2009-04-08
BRPI0707735B8 (pt) 2023-01-10
US20120195788A1 (en) 2012-08-02
WO2007093605A1 (de) 2007-08-23
EP1820866B2 (de) 2018-08-08

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