EP0214679B2 - Alliage dur résistant à la corrosion - Google Patents

Alliage dur résistant à la corrosion Download PDF

Info

Publication number
EP0214679B2
EP0214679B2 EP19860201344 EP86201344A EP0214679B2 EP 0214679 B2 EP0214679 B2 EP 0214679B2 EP 19860201344 EP19860201344 EP 19860201344 EP 86201344 A EP86201344 A EP 86201344A EP 0214679 B2 EP0214679 B2 EP 0214679B2
Authority
EP
European Patent Office
Prior art keywords
alloy
carbide
hard metal
weight
corrosion
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
EP19860201344
Other languages
German (de)
English (en)
Other versions
EP0214679B1 (fr
EP0214679A1 (fr
Inventor
Erich Dr. Kny
Lothar Schmid
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.)
Metallwerk Plansee GmbH
Original Assignee
Metallwerk Plansee 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=3532086&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0214679(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Metallwerk Plansee GmbH filed Critical Metallwerk Plansee GmbH
Publication of EP0214679A1 publication Critical patent/EP0214679A1/fr
Publication of EP0214679B1 publication Critical patent/EP0214679B1/fr
Application granted granted Critical
Publication of EP0214679B2 publication Critical patent/EP0214679B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/067—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds comprising a particular metallic binder

Definitions

  • the invention relates to a hard metal alloy which, in addition to high mechanical strength and high wear resistance, is extremely corrosion-resistant.
  • carbide grades of the most varied composition of carbide and binder phase are known.
  • the most common types of hard metal used so far for machining are those based on tungsten carbide with a binding phase made of cobalt or nickel.
  • These carbide grades have good mechanical strength and wear resistance, but are not very corrosion-resistant, especially in acidic media.
  • the cobalt or nickel binder is particularly exposed to a strong corrosion attack, which leads to a selective dissolution of the binding phase. Subsequently, the strength of the remaining carbide skeleton suddenly drops.
  • EP-A 28 620 is a corrosion-resistant tungsten carbide-based hard metal alloy in which a maximum of 10% of the tungsten carbide can be replaced by additional carbides.
  • the binder alloys which contain 5-45%, consist of at least 50 vol.% Nickel, 2-25 vol.% Chromium and 1-15 vol.% Molybdenum.
  • the binding phase can also contain one or more of the elements Mn, Al, Si, Cu, Co, Fe and W.
  • the tungsten carbide content of this hard metal alloy is at least 88.5% by weight.
  • This carbide alloy additionally contains one or more carbides from the group of titanium, niobium and hafnium carbides with a maximum proportion of 8.5% by weight.
  • the binder phase which is added to the basic component in an amount of 3-11.5% by weight, has as essential components 20-75% by weight cobalt, 4-50% by weight chromium and up to 45% by weight nickel.
  • one or more additional elements from the group W, Mo, Fe, Si, B, C, Ti, Zr, Nb and / or V are included.
  • a third hard metal alloy in which chromium is added to the binder phase, is described in US Pat. No. 3,993,446.
  • This hard metal alloy consists of 70-90% by weight of tungsten carbide-based hard materials, some of which can be replaced by an additional carbide.
  • the binding phase which is 10-30% by weight, consists of 20-90% by weight of nickel, 10-80% by weight of cobalt and 5-25% by weight of chromium.
  • the object of the present invention is to propose a highly corrosion-resistant hard metal alloy which at the same time has a high mechanical strength and a high wear resistance or corrosion resistance against chemically aggressive media.
  • this object is achieved by using a hard metal alloy as a material for components with high corrosion resistance against chemically aggressive media.
  • a hard metal alloy consists of 44-67% by weight of tungsten carbide, 30-50% by weight of tantalum carbide and / or niobium carbide and 3-6% by weight of a binding alloy consisting of nickel and / or cobalt, each with 2-20% by weight of chromium.
  • the binding phase forms a coherent skeleton.
  • Corrosive media can release the entire binding phase if the exposure time is long enough.
  • a tungsten carbide scaffold remains, which has a low strength and which is quickly removed under abrasive stress.
  • a corrosion-improving alloy of the binding phase with chromium and / or molybdenum changes only little about this undesirable property.
  • the corrosion resistance is increased, but the binding phase still forms a coherent framework, so that a corrosive medium can work its way along fine channels into the interior of the alloy.
  • this fact leads to an early destruction of the entire hard metal alloy.
  • the high corrosion resistance of the alloy according to the invention can be explained by the fact that the binding phase does not form a coherent skeleton due to the high additional carbide content. This significantly reduces the effectiveness of the corrosion attack, especially since the tungsten carbide and the listed additional carbides themselves have very good corrosion resistance in acidic media.
  • Table 1 shows the comparison of the mechanical properties of alloys of different compositions according to the prior art and alloys of different compositions according to the present invention.
  • the table shows in particular that most of the alloys according to the invention have significantly better hardness and flexural strength values than alloy 6, which is considered the best alloy according to the prior art in terms of its corrosion resistance.
  • the alloy according to the invention can be produced without problems using known powder metallurgy processes, despite the low binder content.
  • the additional carbides can be added either individually or in the form of mixed carbide crystals. It is also possible to introduce the tungsten carbide as a single crystal or as a mixed crystal with an additional carbide.
  • the advantageous properties can be further improved by a special optimization of the powder metallurgical manufacturing process of the alloy according to the invention. It is essential in this optimized manufacturing process to sinter the alloy at the lowest possible temperatures for as short a time as possible, but the formation of a liquid phase during sintering must not be prevented. The residual porosities remaining through this type of sintering are then closed by hot isostatic post-compression.
  • This optimized production process achieves the desired discontinuous division of the binder phase on the one hand, and on the other hand the grain growth of the carbide phase can be kept as low as possible, which leads to a further increase in hardness of the hard metal alloy according to the invention.
  • the mixture was ground in a ball mill in 2.5 l of acetone for 120 h. After the batch powder had been dried, molded articles were produced, from which various samples for corrosion tests, flexural strength tests and the like were produced. were formed. These samples were sintered in vacuo at 1450 ° C. for 40 minutes and subsequently hot isostatically compressed.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Claims (2)

1. Utilisation de l'alliage dur avec carbures frittés, constitué par 44 à 67 % en poids de carbure de tungstène, 30 à 50 % en poids de carbure de tantale et/ou carbure de niobium, ainsi que par 3 à 6 % en poids d'un alliage liant constitué par du nickel et/ou du cobalt avec à chaque fois 2 à 20 % en poids de chrome en tant que matériau pour des elements de construction résistant à la corrosion, exposée a media chemi- quement agressive.
2. Utilisation de l'alliage dur avec carbures frittés, résistant à la corrosion, selon la revendication 1, en tant que matériau pour parties de soupapes dans des machines motrices à combustion, et pour des parties d'installations de chimie.
EP19860201344 1985-08-08 1986-07-31 Alliage dur résistant à la corrosion Expired - Lifetime EP0214679B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT2315/85 1985-08-08
AT231585A AT385775B (de) 1985-08-08 1985-08-08 Korrosionsfeste hartmetall-legierung

Publications (3)

Publication Number Publication Date
EP0214679A1 EP0214679A1 (fr) 1987-03-18
EP0214679B1 EP0214679B1 (fr) 1988-12-21
EP0214679B2 true EP0214679B2 (fr) 1993-03-24

Family

ID=3532086

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860201344 Expired - Lifetime EP0214679B2 (fr) 1985-08-08 1986-07-31 Alliage dur résistant à la corrosion

Country Status (3)

Country Link
EP (1) EP0214679B2 (fr)
AT (1) AT385775B (fr)
DE (1) DE3661483D1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4963183A (en) * 1989-03-03 1990-10-16 Gte Valenite Corporation Corrosion resistant cemented carbide
SE9100227D0 (sv) * 1991-01-25 1991-01-25 Sandvik Ab Corrosion resistant cemented carbide
US5925197A (en) * 1992-01-24 1999-07-20 Sandvik Ab Hard alloys for tools in the wood industry
US6037287A (en) * 1997-11-26 2000-03-14 Praxair S.T. Technology, Inc. Laser clad pot roll sleeves and bushings for galvanizing baths
SE511212C2 (sv) * 1997-12-22 1999-08-23 Sandvik Ab Kula för kulspetspennor och användning av denna för kulspetspennor med vattenbaserat bläck
US6521353B1 (en) 1999-08-23 2003-02-18 Kennametal Pc Inc. Low thermal conductivity hard metal
JP2001179507A (ja) * 1999-12-24 2001-07-03 Kyocera Corp 切削工具
DE10135790B4 (de) * 2001-07-23 2005-07-14 Kennametal Inc. Feinkörniges Sinterhartmetall und seine Verwendung
CN100420762C (zh) * 2006-04-28 2008-09-24 自贡硬质合金有限责任公司 TiC-WC基合金制品
ES2715824T3 (es) 2012-10-09 2019-06-06 Hyperion Materials & Tech Sweden Ab Material duro con bajo contenido de aglutinante, resistente al desgaste
US20210040587A1 (en) * 2018-11-01 2021-02-11 Sumitomo Electric Industries, Ltd. Cemented carbide, cutting tool, and method of manufacturing cemented carbide
GB201820632D0 (en) * 2018-12-18 2019-01-30 Sandvik Hyperion AB Cemented carbide for high demand applications
DE102019110950A1 (de) 2019-04-29 2020-10-29 Kennametal Inc. Hartmetallzusammensetzungen und deren Anwendungen

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2607676A (en) * 1949-06-01 1952-08-19 Kurtz Jacob Hard metal compositions
US3215510A (en) * 1963-10-02 1965-11-02 Gen Electric Alloy
US3455682A (en) * 1967-07-31 1969-07-15 Du Pont Isostatic hot pressing of refractory bodies
SE333437B (fr) * 1969-03-03 1971-03-15 Asea Ab
US3628921A (en) * 1969-08-18 1971-12-21 Parker Pen Co Corrosion resistant binder for tungsten carbide materials and titanium carbide materials
SE420844B (sv) * 1979-05-17 1981-11-02 Sandvik Ab Sintrad hardmetall av nickelbaserad bindemetall och volframkarbid
CH653204GA3 (fr) * 1983-03-15 1985-12-31

Also Published As

Publication number Publication date
EP0214679B1 (fr) 1988-12-21
ATA231585A (de) 1987-10-15
DE3661483D1 (en) 1989-01-26
AT385775B (de) 1988-05-10
EP0214679A1 (fr) 1987-03-18

Similar Documents

Publication Publication Date Title
EP3426813B1 (fr) Outil d'usinage par enlèvement de copeaux
DE3884887T2 (de) Schwermetallegierungen aus Wolfram-Nickel-Eisen-Kobalt mit hoher Härte und Verfahren zur Herstellung dieser Legierungen.
DE68909898T3 (de) Hochfester, Stickstoff enthaltender Cermet und Verfahren zu seiner Herstellung.
EP0689617B1 (fr) Cermet et son procede de production
DE3785806T2 (de) Zaehes hartmetall und verfahren zu seiner herstellung.
DE10356470B4 (de) Zirkonium und Niob enthaltender Hartmetallkörper und Verfahren zu seiner Herstellung und seine Verwendung
EP0195965B1 (fr) Métal dur et son procédé de fabrication
DE69734515T2 (de) Gesinterte hartlegierung
DE2407410B2 (de) Karbidhartmetall mit ausscheidungshärtbarer metallischer Matrix
DE19907749A1 (de) Gesinterter Hartmetallkörper und dessen Verwendung
EP0214679B2 (fr) Alliage dur résistant à la corrosion
DE2429075A1 (de) Karbonitridlegierungen fuer schneidwerkzeuge und verschleissteile
EP1887096A1 (fr) Acier pour travail à chaud
EP0330913B1 (fr) Procédé de préparation d'un métal dur fritté et métal dur fritté ainsi obtenu
EP3426814B1 (fr) Outil d'usinage par enlèvement de copeaux
DE3884959T2 (de) Cermet-schneidevorrichtung.
DE68927586T2 (de) Cermet und dessen Herstellungsverfahren
EP4127258A1 (fr) Matériau de métal dur à base de carbure de tungstène exempt de cobalt
DE69303998T2 (de) Gesinterte Karbonitridlegierung und Verfahren zu ihrer Herstellung
DE3100926C2 (fr)
DE60001515T2 (de) Ti(C,N) - (Ti,Ta,W) (C,N) - Co - Legierung für Zähigkeit - erfordernde Schneidwerzeug Anwendungen
DE3736350C2 (fr)
DE60003877T2 (de) Ti(C,N) - (Ti,Ta,W) (C,N) - Co - Legierung für algemeine Schneidwerzeug Anwendungen
DE102019110950A1 (de) Hartmetallzusammensetzungen und deren Anwendungen
EP0425061B1 (fr) Métal dur à base de carbonitrure de titane

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE CH DE FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19870121

17Q First examination report despatched

Effective date: 19880601

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE CH DE FR GB IT LI NL SE

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REF Corresponds to:

Ref document number: 3661483

Country of ref document: DE

Date of ref document: 19890126

ET Fr: translation filed
PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: KRUPP WIDIA GMBH

Effective date: 19890721

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

NLR1 Nl: opposition has been filed with the epo

Opponent name: KRUPP WIDIA GMBH

26 Opposition filed

Opponent name: SANDVIK AKTIEBOLAG

Effective date: 19890920

Opponent name: KRUPP WIDIA GMBH

Effective date: 19890721

NLR1 Nl: opposition has been filed with the epo

Opponent name: SANDVIK AKTIEBOLAG

PLAB Opposition data, opponent's data or that of the opponent's representative modified

Free format text: ORIGINAL CODE: 0009299OPPO

R26 Opposition filed (corrected)

Opponent name: KRUPP WIDIA GMBH * 890920 SANDVIK AKTIEBOLAG

Effective date: 19890721

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19920507

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19920615

Year of fee payment: 7

Ref country code: BE

Payment date: 19920615

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19920616

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19920619

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19920623

Year of fee payment: 7

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19920731

Year of fee payment: 7

ITF It: translation for a ep patent filed
PUAH Patent maintained in amended form

Free format text: ORIGINAL CODE: 0009272

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT MAINTAINED AS AMENDED

27A Patent maintained in amended form

Effective date: 19930324

AK Designated contracting states

Kind code of ref document: B2

Designated state(s): BE CH DE FR GB IT LI NL SE

GBTA Gb: translation of amended ep patent filed (gb section 77(6)(b)/1977)

Effective date: 19930303

REG Reference to a national code

Ref country code: CH

Ref legal event code: AEN

NLR2 Nl: decision of opposition
ET3 Fr: translation filed ** decision concerning opposition
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19930731

Ref country code: GB

Effective date: 19930731

Ref country code: CH

Effective date: 19930731

Ref country code: BE

Effective date: 19930731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19930801

NLR4 Nl: receipt of corrected translation in the netherlands language at the initiative of the proprietor of the patent
BERE Be: lapsed

Owner name: METALLWERK PLANSEE G.M.B.H.

Effective date: 19930731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19940201

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19930731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19940331

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19940401

ZE Nl: corrections to earlier entries in headings pe - xe

Free format text: PAT.BUL.15/93 HEADING RE, SECTION 3, PAGE 2307;SHOULD BE ADDED PAT.BUL.15/93 HEADING RE SECTION 4, PAGE 2307;SHOULD BE DELETED

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 86201344.8

Effective date: 19940310

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050731