EP0216036A1 - Schnellösliches Zusatzmittel für Metallschmelzen - Google Patents

Schnellösliches Zusatzmittel für Metallschmelzen Download PDF

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Publication number
EP0216036A1
EP0216036A1 EP86109118A EP86109118A EP0216036A1 EP 0216036 A1 EP0216036 A1 EP 0216036A1 EP 86109118 A EP86109118 A EP 86109118A EP 86109118 A EP86109118 A EP 86109118A EP 0216036 A1 EP0216036 A1 EP 0216036A1
Authority
EP
European Patent Office
Prior art keywords
magnesium
component
alloy
metal
weight
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.)
Withdrawn
Application number
EP86109118A
Other languages
German (de)
English (en)
French (fr)
Inventor
Hartmut Dr. Meyer-Grünow
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.)
Evonik Operations GmbH
Original Assignee
SKW Trostberg AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SKW Trostberg AG filed Critical SKW Trostberg AG
Publication of EP0216036A1 publication Critical patent/EP0216036A1/de
Withdrawn legal-status Critical Current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
    • 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 quick-dissolving additive for molten metals for introducing alloying elements into metals.
  • the alloy elements are usually added to the liquid metal bath in solid form.
  • aluminum is alloyed with magnesium to achieve better strengths, with silicon to improve castability and strength, with manganese and chromium to increase strength and corrosion resistance.
  • a whole series of other alloying elements are known for specifically influencing the alloy properties.
  • the alloying 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 alloy metal content.
  • 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.
  • the invention is therefore based on the object of creating an additive for molten metals which does not have the disadvantages of the prior art mentioned and, in particular despite the high concentration of alloy metal, dissolves quickly and completely in the liquid base metal and does not cause any losses.
  • the additive 2 to 50 wt .-% of a powdery component A, consisting of magnesium and / or a magnesium-containing alloy, and 50 to 98 wt .-% of a powdery component B, consisting of one or more Alloy metal (s) contains or consists of, and that components A and B are intimately mixed in compressed or compacted form.
  • the additives according to the invention have an unexpectedly high dissolution rate, even at very high alloy metal contents, which is higher than that for comparable aluminum-containing alloying agents. In addition, no interfering foreign substances are released, which may cause losses of base metal.
  • Component A can consist of pure magnesium and / or a magnesium-containing alloy, insofar as this does not introduce technically unacceptable amounts of impurities into the base metal when using the additives according to the invention.
  • a magnesium-containing alloy is understood to mean those alloys which contain at least 50% magnesium.
  • the magnesium may preferably also contain aluminum or manganese, but also zinc or silicon, as alloy components.
  • the mass fraction of component A should be as low as possible with good dissolving properties of the alloying agents. Depending on the density of the alloy metal, 2% by weight of component A is sufficient. In the range from 5 to 10% by weight of magnesium component A, an optimal combination of dissolution rate and concentration of the alloying elements in the additive is achieved. When component A is in the range from 10 to 50% by weight, the concentration of the alloying elements in the additive is reduced without the dissolution rate being significantly improved at the same time.
  • Component B which is contained in the additive in a proportion of 50 to 98% by weight, preferably 90 to 98% by weight, consists of one or more alloy metal (s).
  • alloy metal s
  • all alloying elements can be used, with chromium, manganese and / or iron being preferred due to their technical importance.
  • other alloy elements such as Ni, Co, Cu, Ag, Ti, Zr, Hf, V, Nb, Ta, Mo and W can also be present individually or in groups in component B.
  • the alloy metal does not have to be in pure form, but also alloys or mixtures several metals are present, provided that this does not cause any undesirable impurities in the base metal.
  • both component A and component B are present in compacted or pressed form and have been produced by pressing or compacting the intimately mixed powder components.
  • the additive can be in the form of briquettes, tablets or pellets or the like, the size of these bodies being able to be varied within wide limits. It is only essential that the body has a sufficiently high sinking rate in the metal bath for which it is intended, and that the body does not have a thickness that is too large to have an acceptable dissolution rate.
  • the maximum thickness of the body can be assumed to be 50 mm, while the preferred range is between 10 and 50 mm.
  • the moldings are produced by intimately mixing the powdered components A and B and pressing them with the usual technical devices, such as Tablet or briquette press.
  • the particle size of component A should be ⁇ 1 mm, preferably ⁇ 500 ⁇ m, and that of component B should be ⁇ 1 mm, preferably ⁇ 150 ⁇ m, in order to give the moldings a correspondingly large inner surface after the subsequent pressing or compacting, which in turn is responsible for the dissolution rate is essential.
  • the additive according to the invention which is added to the liquid metal bath for alloying in an amount of 0.1 to 25% by weight, immediately sinks into the base metal due to the higher specific weight and dissolves completely and without residue formation, a homogeneous Alloy forms.
  • base metals or alloys in which the elements introduced by the additive according to the invention can be tolerated and which are specifically lighter than the shaped bodies of the additive can be used as the base metal.
  • Particularly suitable base metals are pure aluminum or aluminum alloys as well as pure magnesium or magnesium alloys, in which the advantages of the invention, such as high dissolution rate and high concentration of alloy constituent, were particularly evident.
  • Chromium-containing additives which consisted of pressed mixtures 21 mm in diameter and approximately 25 mm in height, were added to the melt. The chrome addition corresponded to 0.2% of the aluminum. Samples were taken after 5, 10, 15, 30 and 60 minutes and their chromium content was determined. After the complete dissolution, a chromium addition corresponding to 0.2% of the aluminum was made again, so that a final content of 0.4% chromium resulted. Samples were taken as previously described.
  • Chromium powder of finer 250 ⁇ m, magnesium powder with a grain size of 250-62 ⁇ 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.
  • Table 1 shows the mixtures used, the density of the compacts and their dissolving behavior.
  • Example No. 3 shows that even with 96% chromium in a mixture with magnesium, the dissolution behavior is comparable to comparative example No. 4, in which only 75.8% chromium was mixed with aluminum.
  • Comparative example 5 further shows that the aluminum-containing mixtures react unfavorably to an increase in the chromium content from 75.8 to 88.4% in the mixture and that significantly longer dissolution times are necessary.
  • inventive examples Nos. 1, 2 and 3 show that the dissolving behavior of the magnesium-containing mixtures is much less due to an increase in the Chromium content of the mixture is influenced from 80.8% to 90.9% to 96%.
  • Comparative Example No. 6 a mixture containing chloride and fluoride salts was used. In contrast to the mixtures used in Examples Nos. 1 to 5, there was a violent reaction after the addition to the molten aluminum base metal, in which gases were released which burned on the metal bath surface with a glowing flame. In addition, approximately 100 g of aluminum-containing slag formed. This corresponds to a loss of aluminum of about 56 g, which did not occur in the salt-free mixtures of Examples Nos. 1 to 5.

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)
EP86109118A 1985-08-24 1986-07-03 Schnellösliches Zusatzmittel für Metallschmelzen Withdrawn EP0216036A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853530275 DE3530275A1 (de) 1985-08-24 1985-08-24 Schnelloesliches zusatzmittel fuer metallschmelzen
DE3530275 1985-08-24

Publications (1)

Publication Number Publication Date
EP0216036A1 true EP0216036A1 (de) 1987-04-01

Family

ID=6279262

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86109118A Withdrawn EP0216036A1 (de) 1985-08-24 1986-07-03 Schnellösliches Zusatzmittel für Metallschmelzen

Country Status (4)

Country Link
US (1) US4729874A (ja)
EP (1) EP0216036A1 (ja)
JP (1) JPS6247439A (ja)
DE (1) DE3530275A1 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5143564A (en) * 1991-03-28 1992-09-01 Mcgill University Low porosity, fine grain sized strontium-treated magnesium alloy castings

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2911297A (en) * 1956-05-05 1959-11-03 Hugo Wachenfeld Processes for the introduction of alloying constituents into metal melts
DE1909579A1 (de) * 1968-02-26 1969-09-18 Union Carbide Corp Zusatzmittel zu geschmolzenen Metallen oder Legierungen und Verfahren zu seiner Verwendung
DE2012655A1 (de) * 1969-03-17 1970-11-12 Foote Mineral Company, Exton, Pa. (V.St.A.) Zusatz von Mangan zu Aluminium
FR2145943A5 (ja) * 1971-07-12 1973-02-23 Foote Mineral Co
GB2112020A (en) * 1981-12-23 1983-07-13 London And Scandinavian Metall Introducing one or more metals into a melt comprising aluminium

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2085802A (en) * 1935-08-22 1937-07-06 Charles Hardy Inc Treatment of metals
US3298801A (en) * 1966-03-29 1967-01-17 Int Nickel Co Powder metallurgical addition agent
US3941588A (en) * 1974-02-11 1976-03-02 Foote Mineral Company Compositions for alloying metal
DE2731857A1 (de) * 1977-07-14 1979-02-01 Gammal Tarek Prof Dr Ing El Poroese, waermeregulierende traegerbzw. impfkoerper zum einbringen von behandlungsmitteln in fluessige metalle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2911297A (en) * 1956-05-05 1959-11-03 Hugo Wachenfeld Processes for the introduction of alloying constituents into metal melts
DE1909579A1 (de) * 1968-02-26 1969-09-18 Union Carbide Corp Zusatzmittel zu geschmolzenen Metallen oder Legierungen und Verfahren zu seiner Verwendung
DE2012655A1 (de) * 1969-03-17 1970-11-12 Foote Mineral Company, Exton, Pa. (V.St.A.) Zusatz von Mangan zu Aluminium
FR2145943A5 (ja) * 1971-07-12 1973-02-23 Foote Mineral Co
GB2112020A (en) * 1981-12-23 1983-07-13 London And Scandinavian Metall Introducing one or more metals into a melt comprising aluminium

Also Published As

Publication number Publication date
DE3530275A1 (de) 1987-02-26
US4729874A (en) 1988-03-08
JPS6247439A (ja) 1987-03-02

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Inventor name: MEYER-GRUENOW, HARTMUT, DR.