EP0275774A2 - Verfahren zur Herstellung von Chrom-Aluminium-Kügelchen als Chrom-Zusätze zur Aluminium-Schmelze - Google Patents

Verfahren zur Herstellung von Chrom-Aluminium-Kügelchen als Chrom-Zusätze zur Aluminium-Schmelze Download PDF

Info

Publication number
EP0275774A2
EP0275774A2 EP87402937A EP87402937A EP0275774A2 EP 0275774 A2 EP0275774 A2 EP 0275774A2 EP 87402937 A EP87402937 A EP 87402937A EP 87402937 A EP87402937 A EP 87402937A EP 0275774 A2 EP0275774 A2 EP 0275774A2
Authority
EP
European Patent Office
Prior art keywords
powder
aluminum
weight
chromium
alloy
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
Application number
EP87402937A
Other languages
English (en)
French (fr)
Other versions
EP0275774B1 (de
EP0275774A3 (en
Inventor
Alain Defrance
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.)
Delachaux SA
Original Assignee
Delachaux SA
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 Delachaux SA filed Critical Delachaux SA
Priority to AT87402937T priority Critical patent/ATE64762T1/de
Publication of EP0275774A2 publication Critical patent/EP0275774A2/de
Publication of EP0275774A3 publication Critical patent/EP0275774A3/fr
Application granted granted Critical
Publication of EP0275774B1 publication Critical patent/EP0275774B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties

Definitions

  • the present invention relates to a process for producing chrome-aluminum balls for adding chromium to molten aluminum baths.
  • each ball is formed of two heterogeneous components, namely on the one hand aluminum grains and on the other hand grains of chromium possibly alloyed, which exhibit different behaviors; in fact, the generally smaller particle size of the aluminum powder entering for a large part in the composition of the balls makes that part of this powder separates from the rest of the balls to float on the surface of the aluminum bath, to which this powder mixes poorly; in addition, the aluminum grains and the possibly alloyed chromium grains melt at different temperatures, so that their dissolution in the aluminum bath takes place under poor conditions.
  • U.S. Patent No. 4,564,393 discloses another method is essentially distinguished from the method described by U.S. Patent No. 3,592,637 in that a flux is added to the mixture of aluminum powder and chromium powder, optionally alloyed , before compacting into balls; the balls made by this process exhibit heterogeneity similar to that of the balls manufactured according to the teachings of U.S. Patent No. 3,592,637, with the same effect, and furthermore have the disadvantage of being more expensive because of the addition of the flow.
  • the object of the present invention is to remedy these drawbacks, by proposing a process making it possible to economically produce balls having a precise chromium and aluminum content, with a homogeneity conducive to dissolution under the best conditions when incorporated into a molten aluminum bath.
  • the balls resulting from the compacting of the powder thus obtained have all or at least most of their aluminum content in the form of chromium-aluminum alloy grains, having a homogeneous content of these two components and consequently melting at temperatures identical, which we note that they are lower than those of aluminum or chromium considered separately, so that the dissolution of the balls takes place under particularly favorable conditions; the possible addition of finely divided aluminum only intervenes as an adjustment of the aluminum content, in proportions which can be reduced to less than 5% of the weight of crude powder and for example less than 2% or of the order of approximately 2% of the weight of raw powder, thanks to a careful production of the chromium-aluminum alloy, which makes the disadvantages inherent in the presence of aluminum in the form of metallic powder practically negligible, namely the heterogeneity of melting temperature and the risk of flotation of this powder.
  • a binder which is advantageously a carbonaceous binder such as bakelite, which binder is added in sufficiently small proportions so as not to have any influence on the behavior of the balls when 'they are immersed in a bath of molten aluminum; naturally, the compaction process is chosen by the skilled person according to the absence of binder or the presence of binder, as well as the nature of the binder.
  • the alloy thus produced is then finely ground into a crude powder having a particle size advantageously between approximately 0.250 mm and approximately 0.053 mm, and this crude powder or else the alloy itself is analyzed in order to determine the content of the crude powder and of the alloy by weight of chromium and by weight of aluminum.
  • the content of the raw powder or of the alloy by weight of aluminum is less than the 25% sought, an aluminum contribution is made in finely divided form to adjust to the required 25% the aluminum content, and to the required 75% the chromium content; experience shows that, by a good mastery of the aluminothermic technique used to make the alloy of chromium and aluminum, the contribution of aluminum in the form of finely divided aluminum powder can be reduced to 2% about or less than 2%, by weight, of the weight of chromium-aluminum alloy powder; the finely divided aluminum thus optionally added to the raw powder advantageously has a particle size less than 420 ⁇ m, with a proportion of aluminum powder with a particle size less than 53 ⁇ m not exceeding 15% of the total weight of aluminum thus optionally added .
  • This powder advantageously has a density of the order of 2.5 ⁇ 0.2.
  • bakelite is added to this powder, at a rate of approximately 2 ° / 00 by weight of bakelite relative to the weight of the powder containing 25% chromium and 75% aluminum, then the compacting under a pressure and a temperature easily determinable by a person skilled in the art, capable of imparting to the balls obtained by this compacting a density advantageously of the order of 5.6 ⁇ 0.2 and of causing the setting of the bakelite; the balls are then ready for use.
  • a binder is preferred insofar as it makes it possible to avoid dusting of the bou lets; experience has shown that the presence of a small quantity of aluminum in powder form, in the non-alloyed state, makes it possible to considerably reduce the quantity of binder required, and to make the presence of this binder without consequence on the aluminum bath; this quantity of aluminum in powder form, in the non-alloyed state, is for example of the order of 2%, by weight, of the weight of powder of chromium-aluminum alloy.
  • the implementation of the method according to the invention is not limited to the production of balls containing 75% chromium and 25% aluminum, and this method can be applied with the same advantages for chromium contents. ranging from 70 to 80%, with the% aluminum complement.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP87402937A 1986-12-22 1987-12-21 Verfahren zur Herstellung von Chrom-Aluminium-Kügelchen als Chrom-Zusätze zur Aluminium-Schmelze Expired - Lifetime EP0275774B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87402937T ATE64762T1 (de) 1986-12-22 1987-12-21 Verfahren zur herstellung von chrom-aluminiumk¨gelchen als chrom-zusaetze zur aluminiumschmelze.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8617981A FR2608478B1 (fr) 1986-12-22 1986-12-22 Procede de realisation de boulets chrome-aluminium pour l'ajout de chrome dans des bains d'aluminium en fusion
FR8617981 1986-12-22

Publications (3)

Publication Number Publication Date
EP0275774A2 true EP0275774A2 (de) 1988-07-27
EP0275774A3 EP0275774A3 (en) 1988-08-03
EP0275774B1 EP0275774B1 (de) 1991-06-26

Family

ID=9342163

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87402937A Expired - Lifetime EP0275774B1 (de) 1986-12-22 1987-12-21 Verfahren zur Herstellung von Chrom-Aluminium-Kügelchen als Chrom-Zusätze zur Aluminium-Schmelze

Country Status (5)

Country Link
US (1) US4820483A (de)
EP (1) EP0275774B1 (de)
AT (1) ATE64762T1 (de)
DE (1) DE3771059D1 (de)
FR (1) FR2608478B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2299099A (en) * 1995-03-18 1996-09-25 Christopher Duncan Mayes Process for producing grain refining master alloys.

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5316723A (en) * 1992-07-23 1994-05-31 Reading Alloys, Inc. Master alloys for beta 21S titanium-based alloys
ATE286990T1 (de) * 1999-04-15 2005-01-15 Bostlan Sa Zusatzmittel zur zuführung von metallen in aluminiumlegierungen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3592637A (en) * 1968-02-26 1971-07-13 Union Carbide Corp Method for adding metal to molten metal baths
US4104059A (en) * 1977-05-27 1978-08-01 Reading Alloys, Inc. Molybdenum-titanium-zirconium-aluminum master alloys
WO1984000050A1 (fr) * 1982-06-17 1984-01-05 Pechiney Aluminium Chemises de moteurs a base d'alliages d'aluminium et de grains de silicium calibres et leurs procedes d'obtention
EP0102892A1 (de) * 1982-08-20 1984-03-14 C. Delachaux Verfahren zur Herstellung von Metallen und Legierungen hoher Reinheit
EP0229499A1 (de) * 1985-12-16 1987-07-22 Inco Alloys International, Inc. Bildung von intermetallischen und intermetallischähnlichen Vorlegierungen für anschliessende Anwendung beim mechanischen Legieren

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1005220A (en) * 1974-02-25 1977-02-15 National Research Council Of Canada Method for producing ball agglomerated particulate material
GB2112020B (en) * 1981-12-23 1985-07-03 London And Scandinavian Metall Introducing one or more metals into a melt comprising aluminium
US4689199A (en) * 1984-09-27 1987-08-25 Aluminum Company Of America Process for adding material to molten media

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3592637A (en) * 1968-02-26 1971-07-13 Union Carbide Corp Method for adding metal to molten metal baths
US4104059A (en) * 1977-05-27 1978-08-01 Reading Alloys, Inc. Molybdenum-titanium-zirconium-aluminum master alloys
WO1984000050A1 (fr) * 1982-06-17 1984-01-05 Pechiney Aluminium Chemises de moteurs a base d'alliages d'aluminium et de grains de silicium calibres et leurs procedes d'obtention
EP0102892A1 (de) * 1982-08-20 1984-03-14 C. Delachaux Verfahren zur Herstellung von Metallen und Legierungen hoher Reinheit
EP0229499A1 (de) * 1985-12-16 1987-07-22 Inco Alloys International, Inc. Bildung von intermetallischen und intermetallischähnlichen Vorlegierungen für anschliessende Anwendung beim mechanischen Legieren

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2299099A (en) * 1995-03-18 1996-09-25 Christopher Duncan Mayes Process for producing grain refining master alloys.

Also Published As

Publication number Publication date
EP0275774B1 (de) 1991-06-26
DE3771059D1 (de) 1991-08-01
US4820483A (en) 1989-04-11
FR2608478B1 (fr) 1989-06-02
EP0275774A3 (en) 1988-08-03
ATE64762T1 (de) 1991-07-15
FR2608478A1 (fr) 1988-06-24

Similar Documents

Publication Publication Date Title
EP0246118B1 (de) Thermisch beständiger diamanthaltiger Schleifkörper und Verfahren zur Herstellung eines solchen Produktes
CA2350655C (fr) Procede de fabrication par metallurgie des poudres de pieces de forme autobrasantes
EP0904881B1 (de) Verbund- oder Auftragsdiffusionlötsverfahren von aus Titanaluminid hergestellten Werkstücken
FR2489846A1 (fr) Alliages d'aluminium de grande resistance mecanique et a l'usure et leur procede de fabrication
FR2516833A1 (fr) Electrode de soudage a base de nickel
WO1994013426A1 (fr) Materiau et procede pour la formation d'un revetement protecteur sur un substrat en un alliage a base de cuivre
EP0275774B1 (de) Verfahren zur Herstellung von Chrom-Aluminium-Kügelchen als Chrom-Zusätze zur Aluminium-Schmelze
WO2020165542A1 (fr) Procédé de fabrication d'une pièce en alliage d'aluminium
EP1063033A1 (de) Verfahren zur Herstellung eines Werkstücks aus Metall, wie ein Teil eines Fahrzeugrads, und entsprechendes Rad
FR2658441A1 (fr) Procede pour fabriquer au moins la couche d'usure de parties frittees soumises a des contraintes elevees, destinees en particulier a la distribution des soupapes d'une machine a combustion interne.
EP0605585B1 (de) Herstellungsverfahren für eines verbundteil mit verschleissfesten fläche,und nach diesem verfahren hergestellte teilen
FR2658183A1 (fr) Article ceramique moule a base de cuivre, et son procede de fabrication.
FR2659581A1 (fr) Procede pour la formation d'un article ayant une composition d'alliage variable.
EP0907463B1 (de) Schleifwerkzeug und verfahren zur herstellung desselben
BE856070A (fr) Matiere pour cylindre de laminoir
WO2023105162A1 (fr) Poudre métallique pour un procédé de fabrication additive sur lit de poudre
FR2691412A1 (fr) Procédé de préparation d'un alliage fritté à base de fer pour un curseur de pantographe.
FR2896175A1 (fr) Composition de metal d'apport comprenant un melange de poudres et procede de brasage mettant en oeuvre une telle composition de metal d'apport
FR2775744A1 (fr) Piece de frottement comportant une surface de frottement composite chargee de particules dures, son procede de fabrication et dispositif incluant une telle piece
JPH04297284A (ja) アイススケート用ブレード
FR2678533A1 (fr) Procede pour fabriquer un corps fritte avec au moins une couche d'usure contenant du molybdene.
JPH07126862A (ja) 金属製母材表面へのセラミックス層形成方法
BE673047A (de)
FR2504418A1 (en) Centrifugally cast high chromium work roll - with intermediate layer metallurgically integrated with outer layer and axial core
FR2672829A1 (fr) Procede pour realiser une liaison par brasage entre deux pieces, notamment une piece ceramique et une piece metallique, et ensemble soude realise par ce procede.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH DE FR GB GR IT LI LU NL SE

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE FR GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19890102

17Q First examination report despatched

Effective date: 19900724

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

ITF It: translation for a ep patent filed

Owner name: CON LOR S.R.L.

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB GR IT LI LU NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19910626

Ref country code: NL

Effective date: 19910626

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19910626

Ref country code: AT

Effective date: 19910626

REF Corresponds to:

Ref document number: 64762

Country of ref document: AT

Date of ref document: 19910715

Kind code of ref document: T

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REF Corresponds to:

Ref document number: 3771059

Country of ref document: DE

Date of ref document: 19910801

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 19911127

Year of fee payment: 5

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19911217

Year of fee payment: 5

EPTA Lu: last paid annual fee
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19921221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19921231

BERE Be: lapsed

Owner name: S.A. DELACHAUX

Effective date: 19921231

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20031205

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20031210

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20031216

Year of fee payment: 17

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20041221

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20041228

Year of fee payment: 18

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20041231

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20041231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050701

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20041221

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20051221

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060831

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20060831