EP0693564B1 - Verfahren zur Herstellung von Körpern aus intermetallischen Phasen aus pulverförmigen, duktilen Komponenten - Google Patents
Verfahren zur Herstellung von Körpern aus intermetallischen Phasen aus pulverförmigen, duktilen Komponenten Download PDFInfo
- 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
Links
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 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)
- 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)
Description
Claims (4)
- Verfahren zur Herstellung von Körpern aus intermetallischen Phasen aus pulverförmigen, duktilen Komponenten, die in einem vorbestimmten Mischungsverhältnis gemischt, nachfolgend kompaktiert und anschließend zur Bildung des Körpers stranggepreßt werden, dadurch gekennzeichnet, daß die Strangpressparameter so aufeinander abgestimmt werden, daß durch den Umformvorgang eine solche Wärmemenge erzeugt wird, wie sie für die Bildung der Intermetallischen Phasen notwendig ist.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Preßparameter beim Strangpreßvorgang derart gewählt sind, daß die Körpertemperatur während der Pressung die Phasenbildungstemperatur erreicht oder geringfügig überschreitet.
- Verfahren nach einem oder beiden der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß vor dem Preßschritt, bei dem es zur Phasenbildung kommt, mindestens ein Preßschritt ohne Phasenbildung vorgeschaltet wird.
- Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß das Preßverhältnis bei der weiteren Pressung gegenüber dem Preßverhältnis der ersten Pressung erhöht wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4426205A DE4426205A1 (de) | 1994-07-23 | 1994-07-23 | Verfahren zur Herstellung von Körpern aus intermetallischen Phasen aus pulverförmigen, duktilen Komponenten |
DE4426205 | 1994-07-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0693564A1 EP0693564A1 (de) | 1996-01-24 |
EP0693564B1 true EP0693564B1 (de) | 1999-01-20 |
Family
ID=6524016
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95110967A Expired - Lifetime EP0693564B1 (de) | 1994-07-23 | 1995-07-13 | Verfahren zur Herstellung von Körpern aus intermetallischen Phasen aus pulverförmigen, duktilen Komponenten |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0693564B1 (de) |
AT (1) | ATE176005T1 (de) |
DE (2) | DE4426205A1 (de) |
Families Citing this family (3)
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)
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 |
-
1994
- 1994-07-23 DE DE4426205A patent/DE4426205A1/de not_active Withdrawn
-
1995
- 1995-07-13 EP EP95110967A patent/EP0693564B1/de not_active Expired - Lifetime
- 1995-07-13 AT AT95110967T patent/ATE176005T1/de not_active IP Right Cessation
- 1995-07-13 DE DE59504872T patent/DE59504872D1/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE4426205A1 (de) | 1996-01-25 |
DE59504872D1 (de) | 1999-03-04 |
ATE176005T1 (de) | 1999-02-15 |
EP0693564A1 (de) | 1996-01-24 |
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