WO2009010201A2 - Verfahren, bei dem durch mikrowellen erwärmtes metallpulver stranggepresst wird - Google Patents
Verfahren, bei dem durch mikrowellen erwärmtes metallpulver stranggepresst wird Download PDFInfo
- Publication number
- WO2009010201A2 WO2009010201A2 PCT/EP2008/005489 EP2008005489W WO2009010201A2 WO 2009010201 A2 WO2009010201 A2 WO 2009010201A2 EP 2008005489 W EP2008005489 W EP 2008005489W WO 2009010201 A2 WO2009010201 A2 WO 2009010201A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- powder
- powder bed
- metal
- microwave
- extrusion
- Prior art date
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
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/668,952 US20100183469A1 (en) | 2007-07-13 | 2008-07-04 | Powder metallurgy method for producing an extruded profile |
CA 2692925 CA2692925A1 (en) | 2007-07-13 | 2008-07-04 | Powder metallurgy method for producing an extruded profile |
CN200880024157.0A CN101743080A (zh) | 2007-07-13 | 2008-07-04 | 挤压经微波加热的金属粉末的方法 |
JP2010515393A JP2010533238A (ja) | 2007-07-13 | 2008-07-04 | 押し出し異形材を製造するための粉末冶金方法 |
EP08784627A EP2178663A2 (de) | 2007-07-13 | 2008-07-04 | Verfahren, bei dem durch mikrowellen erwärmtes metallpulver stranggepresst wird |
BRPI0813720-0A2A BRPI0813720A2 (pt) | 2007-07-13 | 2008-07-04 | Método de metalurgia do pó para produção de um perfil estrudado |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07405206.9 | 2007-07-13 | ||
EP07405206A EP2014394A1 (de) | 2007-07-13 | 2007-07-13 | Verfahren, bei dem durch Mikrowellen erwärmtes Metallpulver stranggepresst wird |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2009010201A2 true WO2009010201A2 (de) | 2009-01-22 |
WO2009010201A3 WO2009010201A3 (de) | 2009-08-13 |
Family
ID=38740313
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2008/005489 WO2009010201A2 (de) | 2007-07-13 | 2008-07-04 | Verfahren, bei dem durch mikrowellen erwärmtes metallpulver stranggepresst wird |
Country Status (7)
Country | Link |
---|---|
US (1) | US20100183469A1 (de) |
EP (2) | EP2014394A1 (de) |
JP (1) | JP2010533238A (de) |
CN (1) | CN101743080A (de) |
BR (1) | BRPI0813720A2 (de) |
CA (1) | CA2692925A1 (de) |
WO (1) | WO2009010201A2 (de) |
Families Citing this family (3)
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 |
US20220016842A1 (en) * | 2018-12-19 | 2022-01-20 | Hewlett-Packard Development Company, L.P. | Determining a thermal footprint for a three-dimensional printed part |
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 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Family Cites Families (6)
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 (de) * | 1988-02-05 | 1989-12-20 | Anval Nyby Powder Ab | Verfahren zur Herstellung pulvermetallurgischer Gegenstände, insbesondere langgestreckter Gegenstände, wie Stangen, Profile, Rohre od. dgl. |
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 |
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 |
-
2007
- 2007-07-13 EP EP07405206A patent/EP2014394A1/de not_active Withdrawn
-
2008
- 2008-07-04 WO PCT/EP2008/005489 patent/WO2009010201A2/de active Application Filing
- 2008-07-04 CA CA 2692925 patent/CA2692925A1/en not_active Abandoned
- 2008-07-04 JP JP2010515393A patent/JP2010533238A/ja active Pending
- 2008-07-04 EP EP08784627A patent/EP2178663A2/de not_active Withdrawn
- 2008-07-04 BR BRPI0813720-0A2A patent/BRPI0813720A2/pt not_active Application Discontinuation
- 2008-07-04 US US12/668,952 patent/US20100183469A1/en not_active Abandoned
- 2008-07-04 CN CN200880024157.0A patent/CN101743080A/zh active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Non-Patent Citations (1)
Title |
---|
WONG W L E ET AL: "Effect of hybrid length scales (micro + nano) of SiC reinforcement on the properties of magnesium" DIFFUSION AND DEFECT DATA. SOLID STATE DATA. PART B, SOLID STATE PHENOMENA, VADUZ, LI, Bd. 111, 3. Juli 2005 (2005-07-03), Seiten 91-94, XP009093338 ISSN: 1012-0394 * |
Also Published As
Publication number | Publication date |
---|---|
CN101743080A (zh) | 2010-06-16 |
EP2014394A1 (de) | 2009-01-14 |
JP2010533238A (ja) | 2010-10-21 |
WO2009010201A3 (de) | 2009-08-13 |
US20100183469A1 (en) | 2010-07-22 |
BRPI0813720A2 (pt) | 2014-12-30 |
CA2692925A1 (en) | 2009-01-22 |
EP2178663A2 (de) | 2010-04-28 |
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