EP0275289A1 - Schnellösliches zusatzmittel für aluminiumschmelzen. - Google Patents
Schnellösliches zusatzmittel für aluminiumschmelzen.Info
- Publication number
- EP0275289A1 EP0275289A1 EP87904865A EP87904865A EP0275289A1 EP 0275289 A1 EP0275289 A1 EP 0275289A1 EP 87904865 A EP87904865 A EP 87904865A EP 87904865 A EP87904865 A EP 87904865A EP 0275289 A1 EP0275289 A1 EP 0275289A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- component
- aluminum fluoride
- agent according
- metal
- alkali
- 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
Definitions
- the present invention relates to a snow-soluble additive for molten metals for introducing alloying elements into metals.
- the alloying elements are usually added to the liquid metal bath in solid form.
- Aluminum is alloyed e.g. B. with magnesium to achieve better strengths, with silicon to improve the castability and strength, with manganese and chromium to increase the strength and corrosion resistance.
- a whole series of other alloying elements are known for specifically influencing the alloy properties.
- the alloy metals in the form of master alloys which have a higher melting point than the base metal, have previously been added in order to achieve rapid dissolution.
- the disadvantage of these master alloys is their limited content of alloy metal.
- the standard alloys for aluminum alloy only contain a maximum of 20% silicon, up to 20% chromium or up to 50% Mn in addition to aluminum.
- alloy metal alloys in briquetted form.
- alloy briquettes with 25% aluminum and 75% of the metals chromium, manganese and iron are offered on the market.
- the disadvantage of these alloying agents is the 75% content of alloying element and the slow dissolution rate.
- GB-PS 21 12 020 also describes similar mixtures in which part of the aluminum is replaced by chloride or fluoride salts.
- the commercially available chromium, manganese and iron-containing tablets also have a limited dissolution rate.
- the present invention was therefore based on the object of developing an additive for molten metals which does not have the disadvantages of the prior art mentioned, but also enables complete and rapid dissolution in the liquid base metal even with a higher concentration of alloy metal.
- the additive consists of 2 to 50% by weight of a component A consisting of alkali aluminum fluoride and / or a salt containing alkali aluminum fluoride and 50 to 98% by weight of a component B consisting of contains one or more alloy metal (s) and that components A and B are intimately mixed.
- a component A consisting of alkali aluminum fluoride and / or a salt containing alkali aluminum fluoride
- a component B consisting of contains one or more alloy metal (s) and that components A and B are intimately mixed.
- the snow-soluble metal melt additive according to the present invention consists of 2 to 50 wt. % of component A and 50-98% by weight of component B.
- Alkali-aluminum fluoride and / or a salt containing alkali-aluminum fluoride can be used as component A, provided that unacceptable amounts of impurity are thereby introduced into the base metal when the additive according to the invention is used.
- the melting point of the salt or salt mixture should not be higher than that of the base metal.
- alkali aluminum fluoride a mixture of alkali and aluminum fluoride can also be used.
- Salts containing alkali aluminum fluoride are to be understood as meaning such mixtures of alkali aluminum fluoride and other salts, in particular fluoride and / or chloride salts, in which the proportion of alkali aluminum fluoride is at least 50% by weight.
- alkali compounds in principle all alkali metal salts of aluminum fluoride can be used, but the sodium and / or potassium salts are to be regarded as preferred.
- component A in the additive should be as low as possible with good dissolving properties of the alloy component (s). Depending on the density of the alloy metal, 2% by weight of component A is sufficient. The best combination of optimal dissolution rate and maximum concentration of the alloy component in the additive is achieved in the range from 5 to 25% by weight of component A.
- Component B which is contained in the additive in a proportion of 50 to 98% by weight, in particular 75 to 95% by weight, consists of one or more alloy metal (s).
- alloy metal s
- all alloying elements can be used here, with chromium, manganese and iron being preferred due to their technical importance. It can but other alloying elements such as Ni, Co, Cu, Ag, Ti, Zr, Hf, V, Nb, Ta, Mo and W can also be contained in the additive.
- the alloy metal does not have to be in pure form, but alloys or mixtures of several metals can also be used, provided that this does not cause any undesirable impurities in the base metal.
- both component A and component B are in intimately mixed form, which were prepared by mixing the powders.
- the additive can be used in the form of briquettes, tablets or pellets or the like, the size of these grains being able to be varied within wide limits. It is only essential that the bodies have a sufficiently high sinking rate in the metal bath in question and that they do not too thick to ensure an acceptable dissolution rate.
- the maximum thickness of the body can be assumed to be 50 mm, while the preferred range is between 5 and 25 mm.
- the additive can also be in the form of a filled wire, the agent being encased in a suitable material.
- care must be taken to ensure that it quickly dissolves in the melt in order to release the additive and that it does not introduce any undesirable impurities into the metal bath to be alloyed. It has proven to be particularly advantageous to use the respective base metal.
- the additive is produced by intimate
- Component A should preferably be ⁇ 1 mm ⁇ 150 ⁇ m and that of component B should also ⁇ 1 mm
- prior comminution is necessary, which, if necessary, may consist of grinding in the usual mills such as ball, vibrating or impact mills.
- the additive according to the invention is added in an amount of 0.01 to 25% by weight to the liquid base metal for alloying, whereby it dissolves completely and without residue formation in it and forms a homogeneous alloy.
- all metals or alloys in which the elements introduced by the additive according to the invention can be tolerated can be used as base metal.
- Light metal alloys such as pure aluminum or aluminum alloys as well as pure magnesium or magnesium alloys have proven to be particularly suitable, for which the advantages such as high dissolution rate and high concentration of alloy component were particularly evident.
- Chromium powder ⁇ 150 ⁇ m, potassium aluminum fluoride powder (KAIF 4 ) ⁇ 150 ⁇ m and aluminum powder with a grain size of 430 - 75 ⁇ m were used for the mixture compacts.
- the intimate mixture was compressed in a tablet press to approx. 70 - 80% of the theoretical density.
- two state-of-the-art commercial products were used.
- Table 1 shows the mixtures used, the density of the compacts and their solubility behavior.
- Experiments 1 to 4 in which the additives according to the invention were used, show the dissolution rate as a function of the potassium aluminum fluoride content of the mixtures.
- the experiments show with a potassium aluminum fluoride content of 14.1% by weight (cf. experiment 4), the chromium completely dissolved after two minutes.
- the chromium is completely dissolved in the base metal after only ten minutes (cf. Experiment 2).
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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Powder Metallurgy (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3624005A DE3624005A1 (de) | 1986-07-16 | 1986-07-16 | Schnelloesliches zusatzmittel fuer metallschmelzen |
DE3624005 | 1986-07-16 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0275289A1 true EP0275289A1 (de) | 1988-07-27 |
EP0275289B1 EP0275289B1 (de) | 1991-01-23 |
Family
ID=6305292
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87904865A Expired - Lifetime EP0275289B1 (de) | 1986-07-16 | 1987-07-16 | Schnellösliches zusatzmittel für aluminiumschmelzen |
Country Status (5)
Country | Link |
---|---|
US (1) | US4880462A (de) |
EP (1) | EP0275289B1 (de) |
JP (1) | JPH01500527A (de) |
DE (2) | DE3624005A1 (de) |
WO (1) | WO1988000620A2 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0611891B2 (ja) * | 1989-10-16 | 1994-02-16 | 日本金属化学株式会社 | ケイ素をアルミニウムに添加する方法 |
EP0817869A1 (de) * | 1995-03-31 | 1998-01-14 | MERCK PATENT GmbH | Auf al-legierung basierter metallmatrixverbundwerkstoff verstärkt durch tib2-keramikteilchen |
ES2140300B1 (es) * | 1997-05-09 | 2000-10-16 | Bostlan Sa | Aditivo para la introduccion de uno o mas metales en las aleaciones de aluminio. |
ES2240728T3 (es) * | 2002-03-27 | 2005-10-16 | Bostlan, S.A. | Procedimiento para la fabricacion de minitabletas de manganeso de alta concentracion para la aleacion de baños de aluminio y dispositivo de ejecucion del mismo. |
US7700038B2 (en) * | 2005-03-21 | 2010-04-20 | Ati Properties, Inc. | Formed articles including master alloy, and methods of making and using the same |
US8828117B2 (en) | 2010-07-29 | 2014-09-09 | Gregory L. Dressel | Composition and process for improved efficiency in steel making |
WO2015153706A1 (en) | 2014-04-04 | 2015-10-08 | Corning Incorporated | Treatment of glass surfaces for improved adhesion |
CA3031491C (en) * | 2019-01-03 | 2020-03-24 | 2498890 Ontario Inc. | Systems, methods, and cored wires for treating a molten metal |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3591369A (en) * | 1969-03-17 | 1971-07-06 | Foote Mineral Co | Method of adding manganese to aluminum |
US3793007A (en) * | 1971-07-12 | 1974-02-19 | Foote Mineral Co | Manganese compositions |
US3865583A (en) * | 1971-07-12 | 1975-02-11 | Foote Mineral Co | Method of adding manganese to aluminum |
US3865584A (en) * | 1971-07-12 | 1975-02-11 | Foote Mineral Co | Articles for adding manganese to aluminum |
JPS4884011A (de) * | 1972-02-02 | 1973-11-08 | ||
US3935004A (en) * | 1973-09-20 | 1976-01-27 | Diamond Shamrock Corporation | Addition of alloying constituents to aluminum |
US3941588A (en) * | 1974-02-11 | 1976-03-02 | Foote Mineral Company | Compositions for alloying metal |
NL158330B (nl) * | 1975-02-13 | 1978-10-16 | Coq Bv | Geheel gesloten eenfase schakeldveld voor hoge spanning. |
DE2511351A1 (de) * | 1975-03-14 | 1976-09-23 | Diamond Shamrock Corp | Legierungszusaetze und verfahren zum legieren von aluminium |
FR2312570A1 (fr) * | 1975-05-28 | 1976-12-24 | Servimetal | Pastilles composites facilitant l'addition d'elements d'alliages dans l'aluminium et les alliages legers |
GB2112020B (en) * | 1981-12-23 | 1985-07-03 | London And Scandinavian Metall | Introducing one or more metals into a melt comprising aluminium |
-
1986
- 1986-07-16 DE DE3624005A patent/DE3624005A1/de not_active Withdrawn
-
1987
- 1987-07-16 WO PCT/EP1987/000387 patent/WO1988000620A2/de active IP Right Grant
- 1987-07-16 EP EP87904865A patent/EP0275289B1/de not_active Expired - Lifetime
- 1987-07-16 JP JP62504436A patent/JPH01500527A/ja active Pending
- 1987-07-16 DE DE8787904865T patent/DE3767698D1/de not_active Expired - Lifetime
- 1987-07-16 US US07/194,950 patent/US4880462A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
WO1988000620A2 (fr) | 1988-01-28 |
DE3767698D1 (de) | 1991-02-28 |
DE3624005A1 (de) | 1988-01-28 |
JPH01500527A (ja) | 1989-02-23 |
US4880462A (en) | 1989-11-14 |
EP0275289B1 (de) | 1991-01-23 |
WO1988000620A3 (fr) | 1988-03-10 |
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