EP0693564B1 - Procédé de préparation de corps composés de phases intermétallique à partir de composants pulvérulents ductiles - Google Patents

Procédé de préparation de corps composés de phases intermétallique à partir de composants pulvérulents ductiles Download PDF

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Publication number
EP0693564B1
EP0693564B1 EP95110967A EP95110967A EP0693564B1 EP 0693564 B1 EP0693564 B1 EP 0693564B1 EP 95110967 A EP95110967 A EP 95110967A EP 95110967 A EP95110967 A EP 95110967A EP 0693564 B1 EP0693564 B1 EP 0693564B1
Authority
EP
European Patent Office
Prior art keywords
extrusion
intermetallic phases
ratio
pulverulent
phase formation
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.)
Expired - Lifetime
Application number
EP95110967A
Other languages
German (de)
English (en)
Other versions
EP0693564A1 (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

    • 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
    • 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

Definitions

  • the invention relates to a method for producing Intermetallic bodies made of powdered ductile components in a predetermined mixing ratio mixed, subsequently compacted, then extruded to form the body and are finally heat treated.
  • a method of this type is known (DE-PS 38 22 686).
  • the material produced with the known method has a homogeneous structure and is opposite known materials of the same type significantly tougher. Also is any reproducibility with the known method alloys possible, i.e. these are in any quantity with the same predetermined predetermined Properties can be produced.
  • the heat treatment step corresponding to the extrusion step follows is required to the unreacted ductile Components to form the desired intermetallic Phases to react.
  • the object of the present invention is a method to create with which the manufacture of bodies intermetallic phases of the type mentioned at the beginning facilitated and carried out faster and cheaper can be, the properties of body thus produced in terms of porosity and Homogeneity of the material should be improved.
  • the advantage of the method according to the invention is essential in that the manufacturing time and thus the manufacturing costs by eliminating one separately required heat treatment step reduced can be, at the same time advantageously is achieved that the porosity and / or the homogeneity of the body produced in this way is reduced or can be improved.
  • 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 advantage of the ductility of the element powders could possibly be canceled out when using extrusion as a compacting method. 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 which may be elementary or pre-alloyed, are 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 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.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Claims (4)

  1. Procédé de préparation de corps en phases intermétalliques à partir de composants ductiles, pulvérulents, lesquels sont mélangés dans un rapport d'ingrédients fixé auparavant, puis compactés et ensuite extrudés, caractérisé en ce que les paramètres d'extrusion sont adaptés les uns aux autres de façon telle que le procédé de transformation produit une quantité de chaleur telle que nécessaire pour la formation de phases intermétalliques.
  2. Procédé selon la revendication 1, caractérisé en ce que les paramètres de compression dans l'opération d'extrusion sont choisis de façon telle que la température du corps au cours de la compression atteingne la température de formation de phases ou dépasse celle-ci dans une faible mesure.
  3. Procédé selon une ou les deux revendications 1 ou 2, caractérisé que l'étape de compression, au cours de laquelle se produit la formation de phases, est précédée par au moins une étape de compression sans formation de phases.
  4. Procédé selon la revendication 3, caractérisé en ce que le rapport de compression au cours de la compression ultérieure est augmenté par rapport au rapport de compression de la première compression.
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 EP0693564A1 (fr) 1996-01-24
EP0693564B1 true 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)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5620651A (en) 1994-12-29 1997-04-15 Philip Morris Incorporated Iron aluminide useful as electrical resistance heating elements
GB9505114D0 (en) * 1995-03-14 1995-05-03 Imperial College Formation and use of intermetallics
US6280682B1 (en) 1996-01-03 2001-08-28 Chrysalis Technologies Incorporated Iron aluminide useful as electrical resistance heating elements

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5015533A (en) * 1988-03-10 1991-05-14 Texas Instruments Incorporated Member of a refractory metal material of selected shape and method of making
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

Also Published As

Publication number Publication date
EP0693564A1 (fr) 1996-01-24
DE4426205A1 (de) 1996-01-25
DE59504872D1 (de) 1999-03-04
ATE176005T1 (de) 1999-02-15

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