EP1574593A1 - Kaltverformen von Molybdän durch Rückwärts-Fliesspressen - Google Patents
Kaltverformen von Molybdän durch Rückwärts-Fliesspressen Download PDFInfo
- Publication number
- EP1574593A1 EP1574593A1 EP04021093A EP04021093A EP1574593A1 EP 1574593 A1 EP1574593 A1 EP 1574593A1 EP 04021093 A EP04021093 A EP 04021093A EP 04021093 A EP04021093 A EP 04021093A EP 1574593 A1 EP1574593 A1 EP 1574593A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- molybdenum
- recrystallization
- workpiece
- carried out
- recrystallized
- 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
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/18—Making uncoated products by impact extrusion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/022—Manufacture of electrodes or electrode systems of cold cathodes
Definitions
- the present invention relates to the cold working of molybdenum by reverse extrusion.
- Molybdenum is used in lighting because of its thermal, electrical and chemical properties. It is a brittle material at room temperature, and precursors and semi-finished products are usually hot-formed. Molybdenum molded parts such as pipes or caps for the lighting technology can by deep drawing. 1 made of sheets and strips at room temperature.
- Fig. 1 shows the longitudinal section of a produced by the process according to the invention Molybdenum coping in the scale 50: 1.
- Such caps can be used as emitter electrodes in CCFL lamps.
- the material used is converted to 100% waste-free.
- the microscopic longitudinal section through a cap produced according to this method in FIG. 1 shows that crack-free rotationally symmetrical molded parts can be produced in this way.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Forging (AREA)
- Extrusion Of Metal (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
- Discharge Lamp (AREA)
Abstract
Description
Claims (7)
- Verfahren zur Kaltverformung von Molybdän durch Rückwärts-Fließpressen, dadurch gekennzeichnet, daß vor der Kaltverformung eine vollständige Rekristallisation durchgeführt wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Rekristallisation unter Schutzgas und/oder Vakuum durchgeführt wird.
- Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Rekristallisation bei Temperaturen oberhalb 1300°C durchgeführt wird.
- Verfahren nach mindestens einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daßA) ein Molybdän-Werkstück unter Vakuum und/oder Schutzgas bei Temperaturen oberhalb 1400°C vollständig rekristallisiert wird,B) das Werkstück unter Vakuum und/oder Schutzgas abgekühlt wird,C) Abschnitte aus dem so rekristallisierten Werkstück bei Raumtemperatur zu Fertigteilen fließgepreßt werden.
- Verfahren nach Anspruch 4, bei dem die Fertigteile rotationssymmetrisch gepreßt werden.
- Verwendung von nach einem der Ansprüche 1 bis 5 fließgepreßten Molybdän-Formteilen in der Lichttechnik.
- Verwendung nach Anspruch 6 zur Herstellung von Stromdurchführungen durch Glas- oder Keramik-Kolben oder zur Herstellung von Emitter-Elektroden in CCFL- bzw. Kaltkathodenlampen.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10346464 | 2003-10-02 | ||
DE10346464A DE10346464B4 (de) | 2003-10-02 | 2003-10-02 | Verfahren zur Kaltumformung von Molybdän durch Rückwärts-Fließpressen und Verwendung von rückwärts-fließgepressten Molybdän-Formteilen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1574593A1 true EP1574593A1 (de) | 2005-09-14 |
EP1574593B1 EP1574593B1 (de) | 2008-10-29 |
Family
ID=34399318
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04021093A Expired - Lifetime EP1574593B1 (de) | 2003-10-02 | 2004-09-04 | Kaltverformen von Molybdän durch Rückwärts-Fliesspressen |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1574593B1 (de) |
JP (1) | JP4348266B2 (de) |
KR (1) | KR100771731B1 (de) |
CN (1) | CN100335671C (de) |
AT (1) | ATE412786T1 (de) |
DE (2) | DE10346464B4 (de) |
TW (1) | TWI283609B (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113732219B (zh) * | 2021-08-12 | 2023-10-13 | 宁波复能稀土新材料股份有限公司 | 一种稀土铽靶材真空热挤压成型装置 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3553996A (en) * | 1967-11-13 | 1971-01-12 | Battelle Development Corp | Extrusion of brittle materials |
US4462234A (en) * | 1980-06-19 | 1984-07-31 | Battelle Development Corporation | Rapid extrusion of hot-short-sensitive alloys |
US4600446A (en) * | 1983-10-08 | 1986-07-15 | Agency Of Industrial Science & Technology | Method for tempering and working high strength low ductile alloy |
US5051139A (en) * | 1989-05-03 | 1991-09-24 | Schwarzkopf Development Corporation | Process for the manufacture of semi-finished products or preformed parts made of refractory metals and resistant to thermal creep |
US5158709A (en) * | 1990-02-01 | 1992-10-27 | Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh | Electric lamp containing molybdenum material doped wtih aluminum and potassium, molybdenum material for such a lamp, and method of its manufacture |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5731408A (en) * | 1980-06-19 | 1982-02-19 | Battelle Development Corp | Double extruding die and its extruding method |
JPS6075545A (ja) * | 1983-09-29 | 1985-04-27 | Toshiba Corp | ダイス及びその製造方法 |
EP0694084B1 (de) * | 1993-04-15 | 2001-09-19 | Luxfer Group Limited | Verfahren zur herstellung von hohlkoerpern |
JP3079378B1 (ja) * | 1999-02-10 | 2000-08-21 | 東京タングステン株式会社 | Moスパッターリングターゲット材及びその製造方法 |
-
2003
- 2003-10-02 DE DE10346464A patent/DE10346464B4/de not_active Expired - Fee Related
-
2004
- 2004-09-04 EP EP04021093A patent/EP1574593B1/de not_active Expired - Lifetime
- 2004-09-04 AT AT04021093T patent/ATE412786T1/de active
- 2004-09-04 DE DE502004008340T patent/DE502004008340D1/de not_active Expired - Lifetime
- 2004-09-16 JP JP2004270451A patent/JP4348266B2/ja not_active Expired - Fee Related
- 2004-09-21 KR KR1020040075439A patent/KR100771731B1/ko not_active IP Right Cessation
- 2004-09-23 TW TW093128875A patent/TWI283609B/zh not_active IP Right Cessation
- 2004-09-28 CN CNB2004100803092A patent/CN100335671C/zh not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3553996A (en) * | 1967-11-13 | 1971-01-12 | Battelle Development Corp | Extrusion of brittle materials |
US4462234A (en) * | 1980-06-19 | 1984-07-31 | Battelle Development Corporation | Rapid extrusion of hot-short-sensitive alloys |
US4600446A (en) * | 1983-10-08 | 1986-07-15 | Agency Of Industrial Science & Technology | Method for tempering and working high strength low ductile alloy |
US5051139A (en) * | 1989-05-03 | 1991-09-24 | Schwarzkopf Development Corporation | Process for the manufacture of semi-finished products or preformed parts made of refractory metals and resistant to thermal creep |
US5158709A (en) * | 1990-02-01 | 1992-10-27 | Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh | Electric lamp containing molybdenum material doped wtih aluminum and potassium, molybdenum material for such a lamp, and method of its manufacture |
Also Published As
Publication number | Publication date |
---|---|
DE10346464B4 (de) | 2006-04-27 |
KR100771731B1 (ko) | 2007-10-30 |
CN100335671C (zh) | 2007-09-05 |
TWI283609B (en) | 2007-07-11 |
CN1611629A (zh) | 2005-05-04 |
DE10346464A1 (de) | 2005-05-04 |
DE502004008340D1 (de) | 2008-12-11 |
JP4348266B2 (ja) | 2009-10-21 |
KR20050033001A (ko) | 2005-04-08 |
EP1574593B1 (de) | 2008-10-29 |
ATE412786T1 (de) | 2008-11-15 |
TW200526336A (en) | 2005-08-16 |
JP2005111562A (ja) | 2005-04-28 |
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