EP0693564A1 - Procédé de préparation de corps en phase intermétallique à partir de composants pulvérulents ductiles - Google Patents

Procédé de préparation de corps en phase intermétallique à partir de composants pulvérulents ductiles Download PDF

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Publication number
EP0693564A1
EP0693564A1 EP95110967A EP95110967A EP0693564A1 EP 0693564 A1 EP0693564 A1 EP 0693564A1 EP 95110967 A EP95110967 A EP 95110967A EP 95110967 A EP95110967 A EP 95110967A EP 0693564 A1 EP0693564 A1 EP 0693564A1
Authority
EP
European Patent Office
Prior art keywords
pressing
intermetallic phases
ratio
extrusion
pulverulent
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
EP95110967A
Other languages
German (de)
English (en)
Other versions
EP0693564B1 (fr
Inventor
Michael Dr. Dahms
Xaver Dr. Neubert
Klaus Dr. Müller
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.)
GKSS Forshungszentrum Geesthacht GmbH
Original Assignee
GKSS Forshungszentrum Geesthacht GmbH
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 GKSS Forshungszentrum Geesthacht GmbH filed Critical GKSS Forshungszentrum Geesthacht GmbH
Publication of EP0693564A1 publication Critical patent/EP0693564A1/fr
Application granted granted Critical
Publication of EP0693564B1 publication Critical patent/EP0693564B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/23—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces involving a self-propagating high-temperature synthesis or reaction sintering step
    • 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
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/047—Making non-ferrous alloys by powder metallurgy comprising intermetallic compounds

Definitions

  • the invention relates to a method for producing bodies from intermetallic phases from powdery, ductile components, which are mixed in a predetermined mixing ratio, subsequently compacted, then extruded to form the body and finally heat-treated.
  • a method of this type is known (DE-PS 38 22 686).
  • the material produced using the known method has a homogeneous structure and is significantly tougher than known materials of the same type. Any known reproducibility of alloys is also possible with the known method, ie they can be produced in any quantity with the same predetermined properties.
  • the heat treatment step following the extrusion step is required to react the unreacted ductile components to form the desired intermetallic phases.
  • the object is achieved according to the invention in that the heat required for the heat treatment is the heat generated in the course of the extrusion.
  • the advantage of the method according to the invention consists essentially in that the manufacturing time and thus the manufacturing costs can be reduced by eliminating a previously necessary heat treatment step, at the same time advantageously achieving that the porosity and / or the homogeneity of the body produced in this way is reduced or improved can be.
  • the pressing parameters during the extrusion process are selected such that the body temperature during the pressing reaches the phase formation temperature or only slightly exceeds it. If the compacting were to take place above the temperature at which the components react with one another during the pressing to form the intermetallic phases, the extrusion could be used as a compacting method if necessary, the advantage of the ductility of the element powders can be canceled. If brittle intermetallic phases are formed during extrusion, the forming process is unsteady due to their poor plasticity, which could result in large porosity and surface defects in the body.
  • the powdery, ductile components that are elemental or pre-alloyed may be present, mixed in a predetermined mixing ratio.
  • a typical alloy can consist of Ti48Al2Cr (in at%), for example.
  • the 2 at.% Cr was mixed in to ensure their homogeneous distribution in the Ti48Al2Cr as pre-alloy powder Al-15 wt.% Cr according to the stoichiometric alloy composition.
  • the subsequent precompacting of this powder mixture into a body for example into a transportable press bolt, is carried out by cold isostatic pressing (CIP). With a pressure of 450 Nmm ⁇ 2 93.8% of the theoretically calculated material density could be achieved.
  • the precompacted bodies are encapsulated in AlMgSiO, 5 pipes before extrusion.
  • the extrusion is then carried out, the heat required for the heat treatment being the heat generated in the course of the extrusion.
  • the pressing conditions such as pin / pick-up temperature T B / A , the pressing ratio R and the punch speed v St are selected such that the temperature increase in the press strand produced by the deformation is sufficient to trigger an in-situ reaction after the pressing process, and that, on the other hand, the strand temperature during the forming process must not exceed the phase formation temperature to such an extent that the phase reaction proceeds faster than the pressing process.
  • extrusion ratio must therefore be further increased and the body structure refined more by extruding extruded strands again (double extrusion).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
EP95110967A 1994-07-23 1995-07-13 Procédé de préparation de corps composés de phases intermétallique à partir de composants pulvérulents ductiles Expired - Lifetime EP0693564B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4426205 1994-07-23
DE4426205A DE4426205A1 (de) 1994-07-23 1994-07-23 Verfahren zur Herstellung von Körpern aus intermetallischen Phasen aus pulverförmigen, duktilen Komponenten

Publications (2)

Publication Number Publication Date
EP0693564A1 true EP0693564A1 (fr) 1996-01-24
EP0693564B1 EP0693564B1 (fr) 1999-01-20

Family

ID=6524016

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95110967A Expired - Lifetime EP0693564B1 (fr) 1994-07-23 1995-07-13 Procédé de préparation de corps composés de phases intermétallique à partir de composants pulvérulents ductiles

Country Status (3)

Country Link
EP (1) EP0693564B1 (fr)
AT (1) ATE176005T1 (fr)
DE (2) DE4426205A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996028578A1 (fr) * 1995-03-14 1996-09-19 Imperial College Of Science, Technology & Medicine Formation et utilisation de composes intermetalliques
EP0738782A2 (fr) * 1995-04-20 1996-10-23 Philip Morris Products Inc. Aluminiure de fer, utilisable pour résistances de chauffage électrique
US6280682B1 (en) 1996-01-03 2001-08-28 Chrysalis Technologies Incorporated Iron aluminide useful as electrical resistance heating elements

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3809550A1 (de) * 1988-03-22 1989-10-19 Vaw Ver Aluminium Werke Ag Verfahren zur pulvermetallurgischen herstellung eines leichten und warmfesten bauteiles
DE3822686A1 (de) 1988-07-05 1990-01-11 Geesthacht Gkss Forschung Verfahren zur herstellung von intermetallischen phasen aus pulverfoermigen duktilen komponenten
EP0360468A1 (fr) * 1988-09-22 1990-03-28 Texas Instruments Incorporated Article en métal réfractaire de forme déterminée et son procédé de fabrication

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3809550A1 (de) * 1988-03-22 1989-10-19 Vaw Ver Aluminium Werke Ag Verfahren zur pulvermetallurgischen herstellung eines leichten und warmfesten bauteiles
DE3822686A1 (de) 1988-07-05 1990-01-11 Geesthacht Gkss Forschung Verfahren zur herstellung von intermetallischen phasen aus pulverfoermigen duktilen komponenten
FR2633853A1 (fr) * 1988-07-05 1990-01-12 Geesthacht Gkss Forschung Procede de preparation de phases intermetalliques a partir de composantes ductiles pulverulentes
EP0360468A1 (fr) * 1988-09-22 1990-03-28 Texas Instruments Incorporated Article en métal réfractaire de forme déterminée et son procédé de fabrication

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6607576B1 (en) 1994-12-29 2003-08-19 Chrysalis Technologies Incorporated Oxidation, carburization and/or sulfidation resistant iron aluminide alloy
WO1996028578A1 (fr) * 1995-03-14 1996-09-19 Imperial College Of Science, Technology & Medicine Formation et utilisation de composes intermetalliques
EP0738782A2 (fr) * 1995-04-20 1996-10-23 Philip Morris Products Inc. Aluminiure de fer, utilisable pour résistances de chauffage électrique
EP0738782A3 (fr) * 1995-04-20 1998-08-05 Philip Morris Products Inc. Aluminiure de fer, utilisable pour résistances de chauffage électrique
US5976458A (en) * 1995-04-20 1999-11-02 Philip Morris Incorporated Iron aluminide useful as electrical resistance heating elements
US6280682B1 (en) 1996-01-03 2001-08-28 Chrysalis Technologies Incorporated Iron aluminide useful as electrical resistance heating elements

Also Published As

Publication number Publication date
DE4426205A1 (de) 1996-01-25
ATE176005T1 (de) 1999-02-15
EP0693564B1 (fr) 1999-01-20
DE59504872D1 (de) 1999-03-04

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