EP0255603A2 - Four de frittage sous pression élevée - Google Patents

Four de frittage sous pression élevée Download PDF

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Publication number
EP0255603A2
EP0255603A2 EP87109239A EP87109239A EP0255603A2 EP 0255603 A2 EP0255603 A2 EP 0255603A2 EP 87109239 A EP87109239 A EP 87109239A EP 87109239 A EP87109239 A EP 87109239A EP 0255603 A2 EP0255603 A2 EP 0255603A2
Authority
EP
European Patent Office
Prior art keywords
pressure
sintering furnace
pressure sintering
thermal insulation
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Withdrawn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
EP87109239A
Other languages
German (de)
English (en)
Other versions
EP0255603A3 (fr
Inventor
Stoyan Dr. Boneff
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.)
Evonik Operations GmbH
Original Assignee
Degussa 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 Degussa GmbH filed Critical Degussa GmbH
Publication of EP0255603A2 publication Critical patent/EP0255603A2/fr
Publication of EP0255603A3 publication Critical patent/EP0255603A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/001—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a flexible element, e.g. diaphragm, urged by fluid pressure; Isostatic presses
    • B30B11/002—Isostatic press chambers; Press stands therefor
    • 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
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/04—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated adapted for treating the charge in vacuum or special atmosphere
    • 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
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/06—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B5/08—Arrangements of linings
    • 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 for sintering and compressing compacts from metal and / or non-metal powders, consisting of a pressure housing and thermal insulation, within which there is a graphite cylinder surrounded by heating conductors for receiving the compacts.
  • furnaces are required in which corresponding compacts can be sintered and compressed under pressure.
  • Such a high pressure sintering furnace is described for example in DE-GM 84 31 211.
  • This consists of a high-pressure-resistant metal housing in which thermal insulation, e.g. is made of graphite felt. Inside this thermal insulation is the furnace chamber, a graphite tube which is surrounded by heating conductors and in which the compacts are sintered and pressure-compressed with a process gas.
  • This furnace construction has the disadvantage that a great deal of heat energy is transferred from the heating conductors to the wall of the pressure housing through the non-gastight insulation with the process gas.
  • the wall of the pressure housing heats up as a result and must be made thicker for mechanical stability reasons, which on the other hand complicates the heat dissipation through the housing wall and also leads to long cooling times of the furnace.
  • This object was achieved in that a cooling device is installed between the thermal insulation and the pressure housing.
  • the cooling device is preferably installed only in the upper region of the pressure housing. It is also advantageous if the cooling device consists of a metal plate which is adapted to the curvature of the pressure housing and which is advantageously provided with water cooling. In addition, the metal plate on the heating conductor side can be provided with a thermal insulating layer, for example graphite felt, in order to limit the cooling effect.
  • thermal insulation consists of several alternating layers of graphite felt and gas-tight graphite foil, so that passage of the process gas from the furnace chamber to the housing wall is largely prevented or made more difficult.
  • the cooling device which must consist of a good heat-conducting material, is installed directly in front of the housing wall, preferably only in the upper area of the pressure housing.
  • This cooling device is dimensioned so that a large part of the heat generated outside the thermal insulation is absorbed and dissipated by the cooling medium.
  • the pressure housing wall is thermally relieved, so that only smaller wall thicknesses are necessary for mechanical stability.
  • the improved heat transfer through the thinner wall in connection with the cooling device means a shorter cooling time of the furnace and thus a shortening of the individual working cycles.
  • the cooling of the process gas results in a relatively strong circulation of the gas in the space between the thermal insulation and the pressure housing wall.
  • This circulation process leads to relatively small temperature differences between the upper (boiler apex) and lower (boiler bottom) area of the pressure housing. This minimizes the thermal stresses of the pressure housing wall, which are caused by the rising hot process gas without a cooling device, which heats the top of the boiler far more than the bottom of the boiler.
  • Figures I and II schematically show a high-pressure sintering furnace according to the invention in an exemplary embodiment in cross and longitudinal section.
  • a thermal insulation (2) is located within a pressure housing (7).
  • the working space of the high-pressure sintering furnace is formed by a graphite cylinder (5) which is surrounded by heating conductors (1).
  • a cooling device (4) is installed in the upper area of the pressure housing (7) between the housing wall (3) and the thermal insulation (2). in this case consisting of a metal plate adapted to the curvature of the housing, which is provided with water cooling (6) in the form of a meandering tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
EP87109239A 1986-07-30 1987-06-26 Four de frittage sous pression élevée Withdrawn EP0255603A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863625788 DE3625788A1 (de) 1986-07-30 1986-07-30 Hochdrucksinterofen
DE3625788 1986-07-30

Publications (2)

Publication Number Publication Date
EP0255603A2 true EP0255603A2 (fr) 1988-02-10
EP0255603A3 EP0255603A3 (fr) 1989-05-03

Family

ID=6306311

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87109239A Withdrawn EP0255603A3 (fr) 1986-07-30 1987-06-26 Four de frittage sous pression élevée

Country Status (6)

Country Link
US (1) US4830342A (fr)
EP (1) EP0255603A3 (fr)
JP (1) JPS6338885A (fr)
DE (1) DE3625788A1 (fr)
HU (1) HUT49511A (fr)
RO (1) RO100167B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012016225A1 (de) 2012-08-14 2014-03-13 Jürgen Blum Elektro-Feldenergie auf der Basis von zweidimensionalen Elektronensystemen, mit der Energiemasse in dem koaxialen Leitungs- und Spulensystem des koaxialen Generators und Transformators

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4968009A (en) * 1988-08-27 1990-11-06 Kabushiki Kaisha Kobe Seiko Sho Cooling device for a high temperature, high pressure vessel
DE3841521B4 (de) * 1988-12-09 2005-05-25 Dieffenbacher Gmbh + Co. Kg Ofen für HIP-Anlagen
US5294604A (en) * 1989-12-20 1994-03-15 The Government Of The United States Of America As Represented By The Secretary Of The Department Of Health And Human Services Method of treating ocular diseases by periocular administration of cyclosporine A or G
DE10008694A1 (de) * 2000-02-24 2001-08-30 Ald Vacuum Techn Ag Sinterofen
JP3916490B2 (ja) * 2002-03-28 2007-05-16 株式会社神戸製鋼所 熱間等方圧プレス装置および熱間等方圧プレス方法
JP4181805B2 (ja) * 2002-07-08 2008-11-19 株式会社神戸製鋼所 高温高圧容器
CN101903123B (zh) * 2007-12-21 2012-09-05 山特维克知识产权股份有限公司 烧结炉和制造切削刀具的方法
US9638466B2 (en) * 2012-12-28 2017-05-02 Jonathan Y. MELLEN Furnace system with active cooling system and method

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE494608A (fr) *
US3419935A (en) * 1966-12-19 1969-01-07 Atomic Energy Commission Usa Hot-isostatic-pressing apparatus
US3571850A (en) * 1969-04-15 1971-03-23 Atomic Energy Commission Hot-isostatic-pressing apparatus
CH558509A (de) * 1972-06-13 1975-01-31 Asea Ab Zylinderfoermiger, langgestreckter ofen zur behandlung von material bei hoher temperatur in einer gasatmosphaere unter hohem druck.
US3971875A (en) * 1974-01-04 1976-07-27 General Dynamics Corporation Apparatus and method for vacuum hot press joining, compacting and treating of materials
SE389812B (sv) * 1974-05-07 1976-11-22 Asea Ab Utrustning for behandling av material vid hog temperatur och vid hogt tryck
SE411588B (sv) * 1976-08-23 1980-01-14 Asea Ab Cylinderformad langstreckt ugn for behandling av material vid hog temperatur i en gasatmosfer under hogt tryck
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
US4398702A (en) * 1982-03-22 1983-08-16 Ultra-Temp Corporation Metallurgical furnace
JPS6033195U (ja) * 1983-08-11 1985-03-06 株式会社神戸製鋼所 熱間静水圧加圧装置
DE8431211U1 (de) * 1984-10-24 1985-02-14 Degussa Ag, 6000 Frankfurt Hochdrucksinterofen
US4591482A (en) * 1985-08-29 1986-05-27 Gorham International, Inc. Pressure assisted sinter process
DE3621996A1 (de) * 1986-07-01 1988-01-14 Pfeiffer Vakuumtechnik Anlage zum waermebehandeln von werkstoffen im vakuum und unter druck

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012016225A1 (de) 2012-08-14 2014-03-13 Jürgen Blum Elektro-Feldenergie auf der Basis von zweidimensionalen Elektronensystemen, mit der Energiemasse in dem koaxialen Leitungs- und Spulensystem des koaxialen Generators und Transformators

Also Published As

Publication number Publication date
HUT49511A (en) 1989-10-30
RO100167B1 (en) 1992-06-22
DE3625788A1 (de) 1988-02-04
EP0255603A3 (fr) 1989-05-03
JPS6338885A (ja) 1988-02-19
US4830342A (en) 1989-05-16

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Inventor name: BONEFF, STOYAN, DR.