WO2019145498A1 - Agrégat de frittage et procédé de frittage flash - Google Patents

Agrégat de frittage et procédé de frittage flash Download PDF

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Publication number
WO2019145498A1
WO2019145498A1 PCT/EP2019/051891 EP2019051891W WO2019145498A1 WO 2019145498 A1 WO2019145498 A1 WO 2019145498A1 EP 2019051891 W EP2019051891 W EP 2019051891W WO 2019145498 A1 WO2019145498 A1 WO 2019145498A1
Authority
WO
WIPO (PCT)
Prior art keywords
sintering
chamber
sintering chamber
die
electrically conductive
Prior art date
Application number
PCT/EP2019/051891
Other languages
German (de)
English (en)
Inventor
Hermann BÖDINGER
Roman Karmazin
Daniel Kupka
Carsten Schuh
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2019145498A1 publication Critical patent/WO2019145498A1/fr

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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
    • B22F3/10—Sintering only
    • B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
    • 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
    • B22F3/003—Apparatus, e.g. furnaces
    • 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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64—Burning or sintering processes
    • C04B35/645—Pressure sintering
    • 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
    • B22F3/02—Compacting only
    • B22F3/03—Press-moulding apparatus therefor
    • B22F2003/033—Press-moulding apparatus therefor with multiple punches working in the same direction
    • 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
    • B22F3/10—Sintering only
    • B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
    • B22F2003/1051—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding by electric discharge
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/66—Specific sintering techniques, e.g. centrifugal sintering
    • C04B2235/666—Applying a current during sintering, e.g. plasma sintering [SPS], electrical resistance heating or pulse electric current sintering [PECS]

Definitions

  • the invention relates to a sintering unit for spark plasma sintering and a method for spark plasma sintering.
  • Spark plasma sintering is a powder metallurgy pro duction process for the production of workpieces from a pul deformed material.
  • the powdery material is regularly introduced into a pressing tool, a die, pressed and subjected to an electrical sintering current.
  • the Joule heating of the material due to the sintering current leads to its rapid heating and thus enables the efficient sintering of the material.
  • the electrical con tacts by means of which the sintering stream is fed into the pressing tool, cooled to prevent damage to the pressing tool and the contacts themselves.
  • the conductive material must be heated with a sufficiently high heating rate and a sufficiently spatially homogeneous temperature distribution.
  • the pressing tool should be sufficiently robust for industrial production.
  • pressing tools made of metal would certainly be sufficiently robust, but have no sufficiently high heating rate, tempera ture and corrosion resistance or sufficiently homogeneous temperature distribution.
  • the sintering unit according to the invention is used for spark plasma sintering of electrically conductive materials.
  • the erfindungsge Permitted sintering unit has a sintering chamber and a ers th and a second electrical contact, wherein the first and second contacts are arranged to direct sintering current when filling the Sin terhunt with electrically conductive material along a leading through the sintering chamber sintering flow path.
  • a heat-insulating element which forms a thermal insulator and an electrical conductor, is arranged on a section of the sintering flow path extending from the first and / or second contact to the sintering chamber.
  • thermal insulator and “electrical conductor” follow the common technical understanding of these terms.
  • a thermal insulator in the context of this invention is to be understood in particular as meaning a material which has a heat conductivity of at most 8 W / mK, preferably a material of at most 3 W / mK and ideally of at most 1 W / mK.
  • thermal insulation elements By means of a thermal insulator forming thermal insulation elements can be advantageously avoided in the sintering unit according to the invention that heat flows away from the sintering chamber in the direction of the first electrical contact. Since the heating element also forms an electrical conductor is ensures that electrical sintering current can enforce the thermal insulation element. In this way, in the inventions to the invention sintering unit sintered flow through the Sinterkam mer conductive, while the heat due to the sintering through the material evolving heat in or at least near the sintering chamber remains, so that sufficient material for sintering the material amount of heat in the sintering chamber can be reached.
  • the heat-insulating element (s) are / are designed and arranged such that the heat is reliably reliably insulated at this section of the heat-flow path.
  • the thermal insulation element closes thermally sealed with other parts of the Sinteraggre gats and / or the sintering chamber.
  • the sintering chamber is formed with a die made of or with metal.
  • the sintering chamber is formed with graphite.
  • the sintering chamber can basically be formed from or with metal, so that the life of the sintering unit according to the invention does not have to be limited as a result of the choice of material.
  • the die has a substantially cylindrical shell-shaped stared up.
  • this embodiment of the invention can be realized along the cylinder axis in a simple manner, a guide of the or the ram, so that the sintering chamber is easily pressurized.
  • the die surrounds a longitudinal axis.
  • the longitudinal axis forms a sintered flow path for the sintering stream.
  • the sintering chamber is formed with at least one or at least two pressing dies which are / are designed and / or arranged to apply force in one direction along the longitudinal axis.
  • the sintering chamber is formed with at least one press ram or the at least one press ram, wherein the at least one press ram is formed with metal.
  • the sintering unit comprises at least one separating element, which in the sintering chamber
  • the separating element preferably divides the sintering chamber into at least two sintering spaces and / or fills a region of the sintering chamber adjoining the die.
  • the separating element is a metal plate.
  • two or more workpieces can be sintered from the material by means of a sintering chamber divided by separating elements.
  • a dividing element which fills a region of the sintering chamber adjacent to the die, it is possible to effectively prevent adhesion of the material to the die.
  • the sintered workpiece can thus be removed from the die particularly easily.
  • the separating element increases the process reliability since the die is replaced by the separating element. element can be protected.
  • Wanddickenände ments of the die such as when a die must be turned to remove strike marks, be compensated, are provided in the thicker separating elements.
  • the at least one separating element has an electrical insulating layer, in particular insulating layer formed with boron nitride.
  • Purpose is moderately filled with the boron nitride coated separating element an adjacent to the die area of the sintering chamber.
  • boron nitride adhesions of material can be prevented material on the separator.
  • boron nitride forms an electrical insulator, so that the sintering flow can be effectively limited spatially to the area of the material of the sintering chamber. In this way, a FITS efficient heating of the material is guaranteed.
  • the at least one separating element is expediently formed with an electrically conductive layer, in particular with Gra fitfolie or titanium diboride.
  • the separating elements are electrically conductive, so that the separating elements allow the simultaneous production of several workpieces, at the same time not interrupt the sintering current path un, so that the sintered current path for efficient pro duction can pass through the separating elements.
  • the method according to the invention is a method for spark plasma sintering of an electrically conductive material.
  • a sintering unit is used as described above.
  • the sintering chamber of the sintering unit according to the invention is filled with an electrically conductive material.
  • a sintering flow is passed through the material along a sintering flow path passing through the sintering chamber.
  • a sintering flow path passing through the sintering chamber.
  • the sintering flow is passed through the sintering chamber while the heat developing due to the sintering flow through the material is held in or at least near the sintering chamber, so that the material is sintered in the sintering chamber.
  • the single drawing figure 1 shows a sintering unit 10 according to the invention for carrying out the method according to the invention, schematically in longitudinal section.
  • the sintering unit 10 according to the invention shown in FIG. 1 is designed for spark plasma sintering of an electrically conductive and powdery material 20.
  • the sintering unit 10 comprises in a conventional manner a pressing tool 30 comprising on the one hand a cylinder-shaped mold 40 of metal, in the illustratedariessbei play steel.
  • a pressing tool 30 comprising on the one hand a cylinder-shaped mold 40 of metal, in the illustratedariessbei play steel.
  • the pressing tool comprises a first 50 and egg NEN second punch 60, which are axially in the die 40, that is guided along the longitudinal axis 70, so that the ram 50, 60 in the axial direction to each other to be movable Lich.
  • the press punches 50, 60 delimit with the die 40 in a manner known per se a sintering chamber, in which the material 20 to be sintered by means of the press punches 50, 60 is subjected to force so that the material 20 pressed together and thus compressed.
  • the ram 50, 60 are also made of a metal, in the illustrated embodiment steel. In wide ren, not specifically illustrated embodiments, which otherwise correspond to the illustrated embodiment, the ram 50, 60 made of a different metal, for example TZM manufactured.
  • the ram 50, 60 are each at their Sinterkam mer far front side 90, 100 electrically connected to a rule electrical feed: the first ram 50 is connected to a first electrical feed contact (not explicitly shown) and the second ram 60 is with egg nem second electrical contact (not explicitly ge shows) connected.
  • First electrical feed and two ter electrical feed contact serve to initiate a flowing between the first and second feed contact sintering current, which flows in filled with electrically conductive material 20 sintering chamber in the axial direction through the sintering chamber through.
  • the longitudinal axis 70 of the cylindrical shape of the die 40 thus forms a sintering flow path, along which the sintering flow flows when the sintering chamber is filled.
  • the first press die 50 and the second press die 60 are not directly electrically contacted to the respective electrical feed contact. Rather, the sintering unit 10 has a first 110 and a second thermal insulation board 120 for electrical contact.
  • the first press ram 50 is connected to the first heat-insulating plate 110 to the first electrical feed contact and the second ram 60 is connected to the second heat-insulating plate 120 to the second electrical rule feeder contact.
  • the thermal insulation panels 110, 120 are located on each of the sintering chamber distant end face of the respective press ram 50, 60 between the sem and the respective electrical feed contact.
  • the thermal insulation panels 110, 120 are in each case designed as cylindrical flat disks which are oriented coaxially to the longitudinal axis 70 of the cylinder form of the die 40.
  • a pyrometer bore 130 is introduced, which is remote from that of the sintering chamber
  • the material 20 to be sintered is separated from the die 40 by means of steel sheets 140, which can be inserted into the die 40.
  • the steel sheets 140 are provided with an electrically insulating layer 150, for example boron nitride, by means of which adhesions of material to the steel sheet 140 can be avoided.
  • the sintering chamber is designed for the simultaneous sintering of a plurality of workpieces made of the material 20.
  • axial sections of the sintering chamber by means of steel discs 160 are spatially divided Lich, which are coated in the illustrated embodiment with a graphite foil 170, ie by means of an electrically conductive material, so that adhesions of the material to the steel discs are avoidable.
  • a layer of titanium diboride is present.
  • the method according to the invention for spark plasma sintering is carried out. leads by filling in the sintering chamber of the electrically conductive material 20, which ben by means of steel discs 160 is separated from each other at the same time to manufacture several pieces. By means of the electrical supply contacts, the sintering chamber is supplied with electrical current, so that forms along the sintering flow path 70 of the sintering stream. According to the invention teraggregat 10, the workpieces are manufactured with the invention.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne un agrégat de frittage destiné au frittage flash de matériaux électroconducteurs. L'agrégat de frittage comprend une chambre de frittage ainsi qu'un premier et un second contact, les premier et second contacts étant agencés pour conduire un courant de frittage le long d'une voie de courant de frittage traversant la chambre de frittage, lors du remplissage de la chambre de frittage avec une matière électroconductrice. Selon l'invention, dans l'agrégat de frittage, un élément d'isolation thermique respectif est agencé sur une partie de la voie de courant de frittage s'étendant à partir du premier et/ou du second contact jusqu'à la chambre de frittage, qui forme un isolant thermique et un conducteur électrique.
PCT/EP2019/051891 2018-01-26 2019-01-25 Agrégat de frittage et procédé de frittage flash WO2019145498A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018201205.9 2018-01-26
DE102018201205.9A DE102018201205A1 (de) 2018-01-26 2018-01-26 Sinteraggregat und Verfahren zum Spark-Plasma-Sintern

Publications (1)

Publication Number Publication Date
WO2019145498A1 true WO2019145498A1 (fr) 2019-08-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/051891 WO2019145498A1 (fr) 2018-01-26 2019-01-25 Agrégat de frittage et procédé de frittage flash

Country Status (2)

Country Link
DE (1) DE102018201205A1 (fr)
WO (1) WO2019145498A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021202076A1 (de) * 2021-03-04 2022-09-08 Forschungszentrum Jülich GmbH Vorrichtung und Verfahren zum Sintern
DE102021210839A1 (de) 2021-09-28 2023-03-30 Siemens Aktiengesellschaft Herstellungsverfahren für einen Kontaktkörper einer Vakuumschaltröhre, Kontaktkörper für eine Vakuumschaltröhre und Vakuumschaltröhre mit einem solchen Kontaktkörper
WO2024035607A1 (fr) * 2022-08-10 2024-02-15 Heraeus Conamic North America Llc Dispositif de frittage pourvu d'une régulation de gradient de température
EP4360838A1 (fr) * 2022-10-31 2024-05-01 Heraeus Conamic North America LLC Dispositif de frittage avec régulation du gradient de température

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000239709A (ja) * 1999-02-25 2000-09-05 Aisin Chem Co Ltd 直接通電焼結法および焼結装置
WO2008085947A1 (fr) * 2007-01-05 2008-07-17 The University Of Houston System Minimisation de pertes de chaleur et de courants de fuite lors d'un frittage plasma par étincelage
CN102390079A (zh) * 2011-09-26 2012-03-28 西安交通大学 高压烧结组合模具及其制备纳米陶瓷的高压快速烧结方法
WO2013158930A1 (fr) * 2012-04-18 2013-10-24 Nitto Denko Corporation Céramiques au phosphore et leurs procédés de fabrication

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2992541A1 (fr) * 2013-06-20 2016-03-09 Siemens Aktiengesellschaft Procédé et dispositif permettant de produire des éléments de contact pour des contacts de commutation électriques

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000239709A (ja) * 1999-02-25 2000-09-05 Aisin Chem Co Ltd 直接通電焼結法および焼結装置
WO2008085947A1 (fr) * 2007-01-05 2008-07-17 The University Of Houston System Minimisation de pertes de chaleur et de courants de fuite lors d'un frittage plasma par étincelage
CN102390079A (zh) * 2011-09-26 2012-03-28 西安交通大学 高压烧结组合模具及其制备纳米陶瓷的高压快速烧结方法
WO2013158930A1 (fr) * 2012-04-18 2013-10-24 Nitto Denko Corporation Céramiques au phosphore et leurs procédés de fabrication

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Publication number Publication date
DE102018201205A1 (de) 2019-08-01

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