EP2178663A2 - Procédé d'extruder une poudre de métal, qu'est chaufé par des micro-ondes - Google Patents

Procédé d'extruder une poudre de métal, qu'est chaufé par des micro-ondes

Info

Publication number
EP2178663A2
EP2178663A2 EP08784627A EP08784627A EP2178663A2 EP 2178663 A2 EP2178663 A2 EP 2178663A2 EP 08784627 A EP08784627 A EP 08784627A EP 08784627 A EP08784627 A EP 08784627A EP 2178663 A2 EP2178663 A2 EP 2178663A2
Authority
EP
European Patent Office
Prior art keywords
powder
powder bed
metal
heated
extrusion
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Withdrawn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
EP08784627A
Other languages
German (de)
English (en)
Inventor
Horst Adams
Michael Dvorak
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.)
3A Composites International AG
Original Assignee
Alcan Technology and Management Ltd
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 Alcan Technology and Management Ltd filed Critical Alcan Technology and Management Ltd
Priority to EP08784627A priority Critical patent/EP2178663A2/fr
Publication of EP2178663A2 publication Critical patent/EP2178663A2/fr
Withdrawn legal-status Critical Current

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
    • B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • 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
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
    • C22C2026/002—Carbon nanotubes

Definitions

  • the invention relates to a method for producing a profile by extrusion of powder of metal and / or metal alloys, in which method a powder bed is heated to an extrusion temperature below the melting temperature of the powder and pressed under pressure through an opening of a die to the profile.
  • a billet is pressed as a metallic block material through the opening of a die in an extrusion press in the normal case.
  • the powder stocks are usually encapsulated in a container because of their low heat conduction prior to extrusion, and typically, e.g. by cold isostatic pressing, compacted.
  • the poor heat conduction of the powder beds is made even more difficult by the oxide layers acting as an insulator on the metal particles. Due to the higher density and encapsulation during pressing, the heat transfer improves, and the entire powder bed can be heated by external heat homogeneously to the desired extrusion temperature, however, the time until the powder bed has set by heat conduction a uniform temperature distribution, relatively long is. For this reason, the direct processing of metallic powders in extrusion presses has not been successful.
  • the intended for extrusion powder bed must be brought as homogeneous as possible to the desired extrusion temperature.
  • the powder bed according to the prior art is heated in a suitable container either inductively or in a convection oven. It is important to ensure that the heating process takes long enough to a possible ensure uniform temperature distribution within the powder bed. As a result of this long wait to ensure the temperature homogeneity occurs an undesirable delay in the production process. Furthermore, the risk of excessive heating in the outer surface layers of the bed and / or too long a heat treatment time increases. This is of particular importance if from at least two different components existing powder, so-called composite powder whose components at elevated temperature, either individually, eg by oxidation, or among themselves tend to undesirable reactions, to be processed.
  • the invention has for its object to provide a method of the type mentioned, with which a rapid and uniform heating in all areas of the powder bed can be achieved.
  • At least one metal or a metal alloy of the powder is a reactive metal spontaneously forming a natural oxide protective layer on a free surface and / or the powder homogeneously distributed in the powder bed, containing microwave radiation, fibrous particles, and that the powder bed is heated to the extrusion temperature by microwave irradiation.
  • the cavities between the powder particles including the oxide layers act as so-called "waveguides" for the microwaves, since they correspond in dimension to the wavelength of the microwave radiation.Thus the microwave radiation can unhindered and under multiple reflection the entire range of the microwave radiation Penetrate powder bed homogeneously.
  • the density of the powder bed or the dimension of the cavities between the powder particles including the oxide layers can be tuned by an appropriate compression of the powder bed in addition to the wavelength of the microwave radiation.
  • the powder in addition to the metal particles, also absorbs microwave radiation energy absorbing fibrous components, such as e.g. Contains carbon nanotubes (CNTs), they act locally as receiving antennas or absorber for the microwave radiation.
  • fibrous components such as e.g. Contains carbon nanotubes (CNTs)
  • they act locally as receiving antennas or absorber for the microwave radiation.
  • the fibrous constituents are homogeneously distributed in the powder bed or, in the optimal case, even integrated at least partially into the metallic powder particles, a very effective and homogeneous heating of the entire bed can be achieved in this way. This effect can be enhanced by tuning the length of the fibrous components as closely as possible to the wavelength of the microwave radiation.
  • the powder bed when heated to the extrusion temperature, is first irradiated with low microwave energy at a varying frequency and the absorbed energy is measured as a function of the frequency.
  • the so-called resonance frequency results in a maximum of the absorbed energy. With this frequency, the powder feed is now irradiated with high microwave energy, resulting in an effective energy input.
  • the Frequenzabadosvorgang (sweep) with low microwave energy and the subsequent irradiation with high microwave energy with the resonant frequency for heating the Pulversch ⁇ ttung to extrusion temperature can also be carried out fully automatically by means of control electronics, so that adjusted for different Pulver thoroughlysvorgang (sweep) with low microwave energy and the subsequent irradiation with high microwave energy with the resonant frequency for heating the Pulversch ⁇ ttung to extrusion temperature can also be carried out fully automatically by means of control electronics, so that adjusted for different Pulver thoroughlysvorgang (sweep) with low microwave energy and the subsequent irradiation with high microwave energy with the resonant frequency for heating the Pulversch ⁇ ttung to extrusion temperature can also be carried out fully automatically by means of control electronics, so that adjusted for different Pulver thoroughlysvorgang (sweep) with low microwave energy and the subsequent irradiation with high microwave energy with the resonant frequency for heating the Pulversch ⁇ ttung to extrusion temperature can
  • the powder bed can first be precompressed, for example, by means of a screw conveyor in an intermediate container. Subsequently, the thus pre-compressed powder bed in the intermediate container is irradiated with the resonant frequency and thereby heated quickly and uniformly to extrusion temperature. By means of a punch, the precompressed and heated to extrusion temperature powder bed is pushed out of the intermediate container through the die opening. In this way, a continuous extrusion of metallic powder material can be realized.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Extrusion Of Metal (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Abstract

L'invention concerne un procédé permettant de produire un profilé par extrusion de poudre de métal et/ou d'alliages métalliques, selon lequel de la poudre en vrac est portée à une température d'extrusion inférieure à la température de fusion de la poudre et est comprimée sous pression à travers l'ouverture d'une matrice pour former un profilé. Au moins un métal ou un alliage métallique de la poudre est un métal réactif formant spontanément une couche d'oxyde protectrice naturelle au niveau d'une surface libre et/ou la poudre contient des particules fibreuses absorbant le rayonnement micro-onde et réparties de manière homogène dans la poudre en vrac. La poudre en vrac est portée à température d'extrusion par rayonnement micro-onde. Le procédé permet de chauffer de manière homogène toutes les zones de la poudre en vrac.
EP08784627A 2007-07-13 2008-07-04 Procédé d'extruder une poudre de métal, qu'est chaufé par des micro-ondes Withdrawn EP2178663A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08784627A EP2178663A2 (fr) 2007-07-13 2008-07-04 Procédé d'extruder une poudre de métal, qu'est chaufé par des micro-ondes

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07405206A EP2014394A1 (fr) 2007-07-13 2007-07-13 Procédé d'extruder une poudre de métal, qu'est chaufé par des micro-ondes
PCT/EP2008/005489 WO2009010201A2 (fr) 2007-07-13 2008-07-04 Procédé relevant de la métallurgie des poudres pour produire un profilé extrudé
EP08784627A EP2178663A2 (fr) 2007-07-13 2008-07-04 Procédé d'extruder une poudre de métal, qu'est chaufé par des micro-ondes

Publications (1)

Publication Number Publication Date
EP2178663A2 true EP2178663A2 (fr) 2010-04-28

Family

ID=38740313

Family Applications (2)

Application Number Title Priority Date Filing Date
EP07405206A Withdrawn EP2014394A1 (fr) 2007-07-13 2007-07-13 Procédé d'extruder une poudre de métal, qu'est chaufé par des micro-ondes
EP08784627A Withdrawn EP2178663A2 (fr) 2007-07-13 2008-07-04 Procédé d'extruder une poudre de métal, qu'est chaufé par des micro-ondes

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP07405206A Withdrawn EP2014394A1 (fr) 2007-07-13 2007-07-13 Procédé d'extruder une poudre de métal, qu'est chaufé par des micro-ondes

Country Status (7)

Country Link
US (1) US20100183469A1 (fr)
EP (2) EP2014394A1 (fr)
JP (1) JP2010533238A (fr)
CN (1) CN101743080A (fr)
BR (1) BRPI0813720A2 (fr)
CA (1) CA2692925A1 (fr)
WO (1) WO2009010201A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106077656B (zh) * 2016-07-30 2018-05-25 上海交通大学 一种制备具有纳米结构钛制品的方法
EP3898198A4 (fr) * 2018-12-19 2022-08-03 Hewlett-Packard Development Company, L.P. Détermination d'une empreinte thermique d'une pièce imprimée en trois dimensions
CN111940531B (zh) * 2020-06-23 2022-04-08 西安理工大学 一种冷挤压模具及其制备方法
CN117448657A (zh) * 2023-11-23 2024-01-26 中国核动力研究设计院 一种碳化硼不锈钢复合材料及其制备方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2419014C3 (de) * 1974-04-19 1985-08-01 Nyby Bruks AB, Nybybruk Verfahren zum Herstellen von Rohren aus rostfreiem Stahl und Anwendung des Verfahrens auf das Herstellen von Verbundrohren
JPS6393806A (ja) * 1986-10-07 1988-04-25 Ishikawajima Harima Heavy Ind Co Ltd 粉末押出プレス装置に於ける粉末供給装置
US4699657A (en) * 1986-11-03 1987-10-13 Worl-Tech Limited Manufacture of fine grain metal powder billets and composites
EP0327064A3 (fr) * 1988-02-05 1989-12-20 Anval Nyby Powder Ab Procédé de fabrication d'objets par la métallurgie des poudres, en particulier d'objets allongés tels que barres, profils, tubes, etc.
US6121595A (en) * 1997-01-06 2000-09-19 International Business Machines Corporation Applicator to provide uniform electric and magnetic fields over a large area and for continuous processing
DE4313806A1 (de) * 1993-04-27 1994-11-03 Rene Salina Vorrichtung zum Erhitzen von Materialien in einer mit Mikrowellen bestrahlbaren Heizkammer und Verfahren zum Herstellen von keramischem Gut, bei dem das Rohgut mittels Mikrowellen getrocknet wird
JP4346360B2 (ja) * 2002-12-25 2009-10-21 東レ株式会社 電波吸収体用シート材および電波吸収体

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009010201A3 *

Also Published As

Publication number Publication date
EP2014394A1 (fr) 2009-01-14
CA2692925A1 (fr) 2009-01-22
US20100183469A1 (en) 2010-07-22
JP2010533238A (ja) 2010-10-21
CN101743080A (zh) 2010-06-16
WO2009010201A3 (fr) 2009-08-13
BRPI0813720A2 (pt) 2014-12-30
WO2009010201A2 (fr) 2009-01-22

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