EP0587603B1 - Materiau a base de metal, corps moule et procede pour sa fabrication, et utilisation - Google Patents

Materiau a base de metal, corps moule et procede pour sa fabrication, et utilisation Download PDF

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Publication number
EP0587603B1
EP0587603B1 EP92910484A EP92910484A EP0587603B1 EP 0587603 B1 EP0587603 B1 EP 0587603B1 EP 92910484 A EP92910484 A EP 92910484A EP 92910484 A EP92910484 A EP 92910484A EP 0587603 B1 EP0587603 B1 EP 0587603B1
Authority
EP
European Patent Office
Prior art keywords
mass
composite body
boron carbide
protection layer
sintering
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.)
Expired - Lifetime
Application number
EP92910484A
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German (de)
English (en)
Other versions
EP0587603A1 (fr
Inventor
Bernd MÄRTNER
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.)
Widia GmbH
Original Assignee
Widia GmbH
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Filing date
Publication date
Application filed by Widia GmbH filed Critical Widia GmbH
Publication of EP0587603A1 publication Critical patent/EP0587603A1/fr
Application granted granted Critical
Publication of EP0587603B1 publication Critical patent/EP0587603B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C22C33/0292—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with more than 5% preformed carbides, nitrides or borides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
    • C22C32/0052—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
    • C22C32/0057—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides based on B4C

Definitions

  • the invention relates to a powder metallurgical method grinding the starting components together by sintering, Hot pressing, sintering with separate hot isostatic post-compression and a combined sintering / HIP treatment Shaped body and a suitable for its production Process and its use.
  • EP 0 341 643 A1 describes a corrosion-resistant cold work steel and a steel matrix-hard material composite material having this cold work steel.
  • the cold work steel is formed by hot isostatic pressing of pre-alloyed powder of the following composition, given in% by weight: 2 to 3.5 C, 0 to 1.5 Si, 0 to 1.5 Mn, 23 to 27 Cr, 0.5 to 2 , 5 Mo, 3 to 6 V, balance Fe and unavoidable impurities.
  • the document also discloses a steel matrix-hard material composite, which is formed by hot isostatic pressing of a powder mixture consisting of 60 to 90% by volume of a pre-alloyed powder of hardenable cold work steel matrix of the above composition and 40 to 10% by volume of a powder of one of the hard materials TiC, Al 2 O 3 , B 4 C, VC or a mixture of two or more of these hard materials.
  • the core body contains 4 to 15% by mass of boron carbide, 10 up to 80 mass% chromium, possibly 0.1 to 3 mass% titanium and / or 0.1 to 9 mass% silicon, the rest contains iron.
  • Advantageously abrasive wear on the body surface acting forces and temperatures used to with the help of bound and dissolved boron carbide body a very hard and to produce fine grain surface layer that from finely divided metal carbides, metal borides, metal carboborides and very small particles of boron carbide.
  • This Layer advantageously forms due to a mechanical Alloy formation with abrasive wear again and again new from.
  • the molded body can also contain 0.1 to 3% by mass of titanium and / or 0.1 to 9 mass% silicon can be added, which in particular the mechanical parameters for oxygen-rich starting powders of the end product improved.
  • the content is preferably 1% to 2% by mass of titanium and / or silicon.
  • the molded body according to the invention has a wear protection layer 30 to 150 ⁇ m thick a higher hardness than that of the core body on only by the action of wear arises and which continues with Continuous wear of the molded body in its surface edge zones reforms while the core remains unchanged. This maintains the toughness of the core body because in contrast to the edge zone, there are only a few hard areas are.
  • the flexural strength of the Shaped body values between 1200 and 1900 MPa.
  • the core body preferably has a microhardness between 500 up to 900 HV 0.05 and the wear protection layer a micro hardness between 2000 to 3000 HV 0.05.
  • the molded body is produced by the method described in claim 6. Iron powder with a grain size of up to 500 ⁇ m, boron carbide powder with crystallite sizes between 10 and 80 ⁇ m are mixed with the other constituents, the mixture is ground with an anhydrous grinding liquid for at least 5 h, dried, sieved and in a subsequent hot press under vacuum or in an inert gas atmosphere at 1100 up to 1200 ° C and a pressure between 1 to 3 kN / cm 2 or sintering at temperatures between 1150 and 1200 ° C with subsequent hot isostatic pressing.
  • the harder boron carbide particles are ground with the other substances, the boron carbide particles are "hammered” into the softer particles or the softer alloy components are "plated” onto the harder ones.
  • An inert gas such as is preferably used as the inert gas in hot pressing Argon used.
  • the moldings according to the invention are suitable excellent as a wear-resistant body during transport, for processing or processing of mineral goods and as machine components, especially for the automotive industry and / or the Agriculture. Furthermore, the materials according to the invention can also be used for cutting tools.
  • composition was present in concrete exemplary embodiments: (data in each case in mass%) 1 2nd 3rd Cr 34.5 37 24.5 Fe 55.5 58 65.5 B 4 C 8th 4th 7 Ti 1 0 1 Si 1 1 2nd
  • compositions according to Examples 1 to 3 above were mixed, ground with a grinding liquid for 5h, then dried and sieved.
  • the average grain size was after sieving 0.02 mm, with the largest grains values up to 0.1mm.
  • the final hot pressing was at a temperature of 1100 ° C, the holding time at this temperature was between 10 and 20 minutes.
  • the final density the shaped body produced in this way was at least 95%.
  • the boron carbide particles dissolved; the protective layer containing boron carbide, however only forms with abrasive surface wear by "mechanical alloy formation".

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Forging (AREA)

Claims (11)

  1. Corps moulé avec un noyau en,un matériau à base de métal avec 4 à 15% en masse de carbure de bore, 10 à 80% en masse de chrome, le cas échéant 0,1 à 3% en masse de titane et/ou 0,1 à 9% en masse de silicium, reste fer en une quantité comprise entre 10 et 80% en masse, les substances mentionnées en tant que composants de départ étant broyées ensemble et fabriquées par frittage et/ou pressage à chaud, par frittage avec une recompression séparée isostatique à température élevée ou par un traitement combiné de frittage/compression isostatique à température élevée, le corps moulé présentant une couche protectrice d'usure ayant une épaisseur comprise entre 0,03 et 0,15 mm et une dureté qui est plus grande que celle du noyau, et cette couche résultant uniquement de l'action d'un effort d'usure et, dans le cas d'une usure progressive du corps moulé, se renouvelant continûment dans les régions à proximité de la surface de celui-ci, tandis que le noyau reste inchangé.
  2. Corps moulé selon la revendication 1, caractérisé par 50 à 70% en masse de fer, 4 à 10% en masse de carbure de bore et 20 à 40% en masse de chrome.
  3. Corps moulé selon l'une des revendications 1 ou 2, caractérisé par le fait qu'il contient entre 1 et 2% en masse de titane et/ou entre 1 et 2% en masse de silicium.
  4. Corps moulé selon l'une des revendications 1 à 3, caractérisé par le fait que le noyau présente une microdureté comprise entre 500 et 900 HV 0,05 et que la couche protectrice d'usure possède une microdureté qui est comprise entre 2000 et 3000 HV 0,05.
  5. Corps moulé selon l'une des revendications 1 à 4, caractérisé par le fait que la couche protectrice d'usure se compose de carbures métalliques, borures métalliques, carboborures métalliques finement divisés ainsi que de très petites particules residuelles de carbure de bore, ladite couche se renouvelant toujours par suite d'une formation mécanique d'alliage lors de l'usure abrasive.
  6. Procédé de fabrication d'un corps moulé selon l'une des revendications 1 à 5, caractérisé par le fait que de la poudre de fer ayant une grosseur de grain allant jusqu'à 0,5 mm, de la poudre de carbure de bore ayant des grosseurs de cristallite comprises entre 0,01 et 0,08 mm ainsi que les autres composants sont mélangés, que le mélange est broyé pour une durée d'au moins 5 heures avec un liquide de broyage exempt d'eau, est séché, criblé et soumis à un pressage à chaud subséquent sous vide ou dans une atmosphère de gaz inerte à une température de 1100°C et une pression comprise entre 1 et 3kN/cm2, ou à un frittage à des températures comprises entre 1150 et 1200°C avec une compression isostatique subséquente à température élevée.
  7. Procédé selon la revendication 6, caractérisé par le fait que l'on utilise en tant que liquide de broyage de l'alcool, de l'acétone, de l'hexane, de l'heptane, de la benzine et/ou de la tétraline.
  8. Procédé selon la revendication 6 ou 7, caractérisé par le fait que le mélange est broyé dans un broyeur à boulets.
  9. Procédé selon l'une des revendications 6 à 8, caractérisé par le fait que le mélange est criblé après son broyage au moyen d'un crible ayant une largeur de maille de 0,1 mm.
  10. Procédé selon l'une des revendications 6 à 11, caractérisé par le fait que l'on utilise en tant que gaz inerte un gaz rare, de préférence de l'argon.
  11. Utilisation d'un corps moulé selon l'une des revendications 1 à 5 pour des pièces fortement soumises à l'usure, de préférence pour le transport, l'usinage ou le traitement de biens minéraux ainsi que comme pièces de machine, en particulier pour l'industrie automobile ou l'agriculture.
EP92910484A 1991-06-01 1992-05-26 Materiau a base de metal, corps moule et procede pour sa fabrication, et utilisation Expired - Lifetime EP0587603B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4118067 1991-06-01
DE4118067A DE4118067A1 (de) 1991-06-01 1991-06-01 Metallbasiswerkstoff, formkoerper und verfahren zu seiner herstellung sowie verwendung
PCT/DE1992/000426 WO1992021783A1 (fr) 1991-06-01 1992-05-26 Materiau a base de metal, corps moule et procede pour sa fabrication, et utilisation

Publications (2)

Publication Number Publication Date
EP0587603A1 EP0587603A1 (fr) 1994-03-23
EP0587603B1 true EP0587603B1 (fr) 1999-01-20

Family

ID=6433021

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92910484A Expired - Lifetime EP0587603B1 (fr) 1991-06-01 1992-05-26 Materiau a base de metal, corps moule et procede pour sa fabrication, et utilisation

Country Status (4)

Country Link
EP (1) EP0587603B1 (fr)
AT (1) ATE176007T1 (fr)
DE (2) DE4118067A1 (fr)
WO (1) WO1992021783A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE470580B (sv) * 1993-02-11 1994-10-03 Hoeganaes Ab Järnsvamppulver innefattande hårdfasmaterial
JP3381487B2 (ja) * 1995-11-06 2003-02-24 株式会社日立製作所 原子力プラント制御棒駆動装置用ローラ及びそれを用いた制御棒駆動装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1329728A (fr) * 1962-05-04 1963-06-14 Hispano Suiza Lallemant Perfectionnements apportés aux garnitures de friction, notamment à celles pour freins d'aviation
US3306741A (en) * 1962-09-12 1967-02-28 Hispano Suiza Lallemant Soc Friction linings and processes for the production of such linings
DE2809184A1 (de) * 1977-03-09 1978-09-14 Krebsoege Gmbh Sintermetall Verfahren zur herstellung von harten, verschleissfesten werkstuecken
DE3714239C2 (de) * 1987-04-29 1996-05-15 Krupp Ag Hoesch Krupp Verfahren zur Herstellung eines Werkstoffs mit einem Gefüge nanokristalliner Struktur
DE3815833A1 (de) * 1988-05-09 1989-11-23 Seilstorfer Gmbh & Co Metallur Korrosionsbestaendiger kaltarbeitsstahl und diesen kaltarbeitsstahl aufweisender stahlmatrix-hartstoff-verbundwerkstoff

Also Published As

Publication number Publication date
ATE176007T1 (de) 1999-02-15
EP0587603A1 (fr) 1994-03-23
WO1992021783A1 (fr) 1992-12-10
DE4118067A1 (de) 1992-12-03
DE59209623D1 (de) 1999-03-04

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