EP1127639A2 - Four de frittage sous pression élevée - Google Patents

Four de frittage sous pression élevée Download PDF

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Publication number
EP1127639A2
EP1127639A2 EP01103716A EP01103716A EP1127639A2 EP 1127639 A2 EP1127639 A2 EP 1127639A2 EP 01103716 A EP01103716 A EP 01103716A EP 01103716 A EP01103716 A EP 01103716A EP 1127639 A2 EP1127639 A2 EP 1127639A2
Authority
EP
European Patent Office
Prior art keywords
sintering furnace
pressure sintering
furnace according
cooling
cooling device
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Withdrawn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
EP01103716A
Other languages
German (de)
English (en)
Other versions
EP1127639A3 (fr
Inventor
Andreas Dipl.-Ing.(FH) Aust
Gerhard Dipl.-Ing.(FH) Dannehl
Peter Dipl.-Ing.(FH) Felski
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.)
ALD Vacuum Technologies GmbH
Original Assignee
ALD Vacuum Technologies 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 ALD Vacuum Technologies GmbH filed Critical ALD Vacuum Technologies GmbH
Publication of EP1127639A2 publication Critical patent/EP1127639A2/fr
Publication of EP1127639A3 publication Critical patent/EP1127639A3/fr
Withdrawn legal-status Critical Current

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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
    • B22F3/12—Both compacting and sintering
    • B22F3/14—Both compacting and sintering simultaneously
    • B22F3/15—Hot isostatic pressing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/04—Sintering pots or sintering pans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein

Definitions

  • the invention relates to a high-pressure sintering furnace according to the preamble of the claim 1.
  • overpressure sintering furnaces have a relatively long cooling time. It takes about seven hours to go from 1500 ° C at 50 bar to 80 ° C and 30 bar come. During this time, the stoves cannot be used, and also the busy staff can often do nothing but wait during the time.
  • a known furnace for isostatic heat pressing has a pressure chamber in which is an oven room with radiators, between the oven room and a gap between an insulating jacket and the inner wall of the pressure chamber there is a gas connection path with a valve (DE-C-27 22 065). If that Valve is opened, you get a closed flow circuit, with one Self-circulation sets in that the gas in the gap is colder and also heavier than the gas in the furnace room.
  • the known furnace is a vertical one erected oven.
  • Another known sintering furnace for powder metallurgy is one for cooling of the furnace interior provided with a heat exchanger, the is arranged outside the furnace main body (DE-A-28 13 758).
  • This sintering furnace is not suitable for the sinter-HIP technology because the actual furnace space very small and the total boiler volume is many times larger. This means, that the gas consumption during the HIP phase, compared to the batch volume, would be very large. Since the operating costs for argon are high, the known one would be Sintering furnace cannot be used as a HIP furnace for economic reasons.
  • Another known method for cooling a sintering furnace uses a cooling gas in a closed circuit through the furnace and over the sintered workpieces and driven by a cooling element located in the furnace (EP-A-0 995 960). Natural convection can serve as a drive here.
  • the invention has for its object the last in a high pressure sintering furnace to cause a gas movement with simple means.
  • the invention thus relates to a sintering furnace which, after the sintering process has ended can be cooled quickly.
  • the cooling is accelerated by the fact that in an inert gas is circulated to the sintering furnace, which heats up gives a heat exchanger.
  • the advantage achieved with the invention is in particular that by mere asymmetrical arrangement of the cooling system in the oven a self convection of a inert gas arises, which acts as a forced cooling device because of this self-convection the inert gas is circulated, which transfers its heat to you Gives off heat exchanger.
  • Fig. 1a the temperature profiles in a conventional sintering furnace and in shown a sintering furnace according to the invention.
  • FIG. 1b shows the pressure profiles that run parallel to this.
  • the temperature profile curve I is divided into several sections.
  • the one through the Section 1 and 2 defined section represents the heating phase, i. H. the one Phase in which the material to be sintered from 0 ° C to z. B. 1370 ° C is heated. For example, this phase lasts four hours. Then the final temperature reached held at 1370 ° C for about two hours.
  • This phase is shown in Fig. la marked by the reference numbers 2 and 3.
  • the kink in points 6 and 11 in curves III and IV is one Follow the opening of the sleeve cover.
  • FIG. 2 shows a sintering furnace 20 in a perspective view.
  • This sintering furnace has a cylindrical shape and rests on a frame 21.
  • a door 22 At the front there is a door 22 which is pivotable about a hinge 23.
  • FIG. 3 shows the same sintering furnace 20 again in a view from the front, with the door 22 open.
  • a batch space 24, in. Can be seen here which is the material to be sintered during the sintering process.
  • This batch room 24 is enclosed by a susceptor 25, which is surrounded by a heater 26 is. In a variant of the invention, this susceptor 25 can also be omitted.
  • the Heater 26 is in turn surrounded by an insulation cylinder 27. More details the internal structure of the sintering furnace 20 can be seen from FIG. 4.
  • the cylindrical sintering furnace 20 rests on the frame 21, which has two supports 30, 31 arranged next to one another.
  • the outer shell of the sintering furnace 20 is formed by a steel jacket 32.
  • a steel jacket 33 arranged at a short distance from and concentric to this steel jacket 32.
  • a cooling medium 34 In the space between the outer Steel jacket 32 and the inner steel jacket 33 is a cooling medium 34, for. B. cooling water.
  • an insulating cylinder 27 is arranged concentrically to the outer steel jacket 32, which consists of a laminate of graphite and felt.
  • This insulating cylinder 27 is held by three bolts 35, 36, 37, which are used simultaneously for the power supply Heating 26 serve.
  • the bolts 35, 36, 37 are through the steel jackets 33, 32 after guided on the outside and provided with cable connections 38, 39, 40.
  • two-phase cables 41, 42, 43 are connected, for example designed for an alternating voltage of 50 volts and an alternating current of 3500 A. are.
  • the connection points between the cables 41 to 43 and the cable connections 38 to 40 are each surrounded by a protective housing 44, 45, 46.
  • temperature sensors 68, 69, 70 are provided for monitoring the temperature of the cooling water between the steel jackets 32, 33.
  • control temperature sensors 71, 72 are also provided, which is the temperature in the inner sintering area 24 capture.
  • the cooling shirt 65, 66, 67 begins on the right side at an angle ⁇ to the z-axis and ends at an angle of - ⁇ to the z-axis on the left, where ⁇ are in the order of 40 ° and ⁇ in the order of 15 °. It it goes without saying that the cooling shirt can also consist of other materials and ⁇ or ⁇ can also have other amounts.
  • the inert gas in the left Part of the sintering furnace 20 cooled more than in the right part.
  • the consequence of this is a circulation of the gas in the direction of arrows 80, 81 because that is on the left increasingly cool gas falls down and thus the warmer gas pushes up on the right.
  • the angles ⁇ and ⁇ are only exemplary in FIG. 4 specified. It goes without saying that an optimization calculates these angles can be, for example, using the calculation method of the finite elements. In which Finite element method is originally a numerical method using computers to determine stresses and strains on complicated, analytically unpredictable, loaded component, but also on Currents is applicable. Essential for the generation of an increased convection current the inert gas is the asymmetrical arrangement of the cooling area relative to the y axis, d. H. the angle ⁇ on the right side must not yet appear once on the left.
  • cooling shirt is always in one piece trained and then must be shifted relative to the y-axis. It would be too possible, the cooling shirt z. B. near the y axis and on the a smaller cooling shirt part on the right and a larger one on the left.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Powder Metallurgy (AREA)
  • Tunnel Furnaces (AREA)
  • Furnace Details (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
EP01103716A 2000-02-24 2001-02-15 Four de frittage sous pression élevée Withdrawn EP1127639A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10008694 2000-02-24
DE2000108694 DE10008694A1 (de) 2000-02-24 2000-02-24 Sinterofen

Publications (2)

Publication Number Publication Date
EP1127639A2 true EP1127639A2 (fr) 2001-08-29
EP1127639A3 EP1127639A3 (fr) 2003-01-22

Family

ID=7632261

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01103716A Withdrawn EP1127639A3 (fr) 2000-02-24 2001-02-15 Four de frittage sous pression élevée

Country Status (3)

Country Link
EP (1) EP1127639A3 (fr)
CN (1) CN1232374C (fr)
DE (1) DE10008694A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9358747B2 (en) 2007-12-14 2016-06-07 Avure Technologies Ab Hot isostatic pressing arrangement
CN108253790A (zh) * 2018-04-01 2018-07-06 中鸿纳米纤维技术丹阳有限公司 一种用于硅气凝胶保温毡生产的复合增强材料用烧结炉
CN109690710A (zh) * 2016-09-23 2019-04-26 日东电工株式会社 烧结磁体形成用烧结体的制造方法及使用了烧结磁体形成用烧结体的永磁体的制造方法
CN117464006A (zh) * 2023-12-28 2024-01-30 湘潭大学 一种多区域控制真空烧结炉及其温度场、气氛场控制方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104110963B (zh) * 2014-07-21 2016-08-24 洛阳西格马炉业股份有限公司 一种高温气压烧结炉
CN109732091B (zh) * 2019-03-01 2023-09-08 宁波恒普技术股份有限公司 一种压力烧结炉及其分区加热装置
CN120907328B (zh) * 2025-10-10 2026-01-06 嘉兴精科科技有限公司 一种基于石墨真空烧结炉烧结钛合金的设备及工艺

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS589806B2 (ja) * 1977-03-30 1983-02-23 住友電気工業株式会社 粉末冶金用焼結炉
DE3443664A1 (de) * 1984-11-30 1986-06-05 Thyssen Guss AG Feingusswerk Bochum, 4630 Bochum Verfahren und vorrichtung zur schnellkuehlung einer hip-anlage
DE3625788A1 (de) * 1986-07-30 1988-02-04 Degussa Hochdrucksinterofen
DE3833337A1 (de) * 1988-09-30 1990-04-05 Dieffenbacher Gmbh Maschf Vorrichtung zur schnellkuehlung von werkstuecken und des druckbehaelters in einer hip-anlage
US6352430B1 (en) * 1998-10-23 2002-03-05 Goodrich Corporation Method and apparatus for cooling a CVI/CVD furnace

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9358747B2 (en) 2007-12-14 2016-06-07 Avure Technologies Ab Hot isostatic pressing arrangement
CN109690710A (zh) * 2016-09-23 2019-04-26 日东电工株式会社 烧结磁体形成用烧结体的制造方法及使用了烧结磁体形成用烧结体的永磁体的制造方法
EP3518258A4 (fr) * 2016-09-23 2020-06-24 Nitto Denko Corporation Procédé de fabrication d'un corps fritté pour former un aimant fritté, et procédé de fabrication d'un aimant permanent à l'aide d'un corps fritté pour former un aimant fritté
CN109690710B (zh) * 2016-09-23 2022-03-11 日东电工株式会社 烧结磁体形成用烧结体的制造方法及使用了烧结磁体形成用烧结体的永磁体的制造方法
CN108253790A (zh) * 2018-04-01 2018-07-06 中鸿纳米纤维技术丹阳有限公司 一种用于硅气凝胶保温毡生产的复合增强材料用烧结炉
CN117464006A (zh) * 2023-12-28 2024-01-30 湘潭大学 一种多区域控制真空烧结炉及其温度场、气氛场控制方法
CN117464006B (zh) * 2023-12-28 2024-03-12 湘潭大学 一种多区域控制真空烧结炉及其温度场、气氛场控制方法

Also Published As

Publication number Publication date
CN1311424A (zh) 2001-09-05
DE10008694A1 (de) 2001-08-30
EP1127639A3 (fr) 2003-01-22
CN1232374C (zh) 2005-12-21

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