EP0792390B1 - Insert en carbure fritte revetu pour applications de coupe de metal - Google Patents

Insert en carbure fritte revetu pour applications de coupe de metal Download PDF

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Publication number
EP0792390B1
EP0792390B1 EP95942809A EP95942809A EP0792390B1 EP 0792390 B1 EP0792390 B1 EP 0792390B1 EP 95942809 A EP95942809 A EP 95942809A EP 95942809 A EP95942809 A EP 95942809A EP 0792390 B1 EP0792390 B1 EP 0792390B1
Authority
EP
European Patent Office
Prior art keywords
binder phase
cemented carbide
weight
max
phase
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
EP95942809A
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German (de)
English (en)
Other versions
EP0792390A1 (fr
Inventor
Marian Mikus
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.)
Sandvik AB
Original Assignee
Sandvik AB
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Filing date
Publication date
Application filed by Sandvik AB filed Critical Sandvik AB
Publication of EP0792390A1 publication Critical patent/EP0792390A1/fr
Application granted granted Critical
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Anticipated expiration legal-status Critical
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • C23C30/005—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process on hard metal substrates

Definitions

  • the present invention relates to coated cemented carbide inserts with improved cutting properties being obtained as a result of modifications of the chemical and mechanical properties of the binder phase.
  • Cemented carbide grades for metal cutting applications generally contain WC, ⁇ -phase (a solid solution of generally TiC, NbC, TaC and WC) and binder phase, generally cobalt. Their properties are optimized by varying the WC grain size, volume fraction of the binder phase and/or the ⁇ -phase and by optimising the carbon content.
  • One recent major improvement of the properties of coated cemented carbide is the introduction of binder phase enriched surface zones.
  • cemented carbides with binder phase enriched surface zones are mainly found in ⁇ -phase containing grades whereas straight WC-Co grades have even binder phase distribution without said binder phase enrichment.
  • the binder phase is based on cobalt containing varying amounts of tungsten and carbon in solid solution. In addition to tungsten or carbon, only very low contents of other elements (mainly impurities) are present in the binder phase.
  • binder phase alloys based on Co-Ni-Cr or Ni-Cr are used e.g. such as disclosed in EP-A-28620.
  • the invention relates to a coated cemented carbide for interrupted machining of steel and cast iron metal cutting applications.
  • Said cemented carbide contains 4-14 weight-% binder phase consisting of in solid solution in weight-%: Co 20-80, Mo 1-6, preferably about 2, Cr 3-15, and rest Ni and, optionally W max 30, Mo max 15, Al max 2 and Fe max 70. V may be added up to 5 weight-%.
  • the Co:Ni weight ratio in the binder phase is about 1:1 or about 3:1.
  • the carbon content should be between a lower value corresponding to the ⁇ -phase limit and an upper value corresponding to the stoichiometric carbon content.
  • the carbon content can be below the ⁇ -phase limit and thus the cemented carbide will contain also ⁇ -phase or other substoichiometric phases. 1-20 volume-% has been found suitable.
  • the invention can be applied to inserts with even distribution of binder phase or, preferably, to inserts with a binder phase enriched surface zone up to 50 ⁇ m.
  • the degree of the binder phase enrichment shall be between 1.2 and 2.5 times, preferably between 1.4 and 1.8, higher than the binder phase content of the rest of the insert.
  • Such inserts can be made e.g. using the technique disclosed in US 4,610,931.
  • the cemented carbide is coated with wear resistant layers as known in the art using known CVD, MTCVD or PVD technique.
  • MTCVD is a moderate temperature CVD-process using e.g. CH 3 CN gas and TiCl 4 . If the total nickel content is more than about 1.5 weight-% care has to be taken to avoid the detrimental effects of nickel on the coating quality e.g. by using at least at the beginning of the coating process a rather low temperature, preferably ⁇ 960 °C.
  • Coatings comprising carbides and/or carbonitrides and/or oxicarbides and/or oxinitrides and/or oxicarbonitrides of titanium and/or Al 2 O 3 are particularly useful.
  • at least one 0.3-5 ⁇ m, preferably 0.5-1.5 ⁇ m, interlayer comprising Ti(C,O) or Ti(C,O,N) or Ti(N,O) is deposited within a part of the coating containing titanium about 0.5-3 ⁇ m from the cemented carbide surface such as disclosed in Swedish Patent Application 9400951-1.
  • the coating thickness shall be 3-16 ⁇ m.
  • the total coating thickness should be 3-7 ⁇ m and for turning applications the total coating thickness should be 5-16 ⁇ m.
  • the present invention is particularly useful in machining of steel and cast iron when the cutting inserts are subjected to thermal and mechanical fatigue conditions. This is typical for milling operations but sometimes it also occurs in certain turning operations with intermittent character.
  • the reason for the observed tool life for the coated cemented carbide according to the present invention is still not understood in detail. It is believed that through the cracks already present in the coating, or formed during the cutting within the cemented carbide or the coating, the binder phase is oxidised causing weakening of the areas close to the coating. By use of the more oxidation resistant binder phase compositions this type of drawback is largely decreased.
  • the chromium addition increases the binder phase oxidation resistance.
  • addition of nickel both increases the oxidation resistance of the cobalt binder phase but also decreases the deformation hardening by stabilization of the FCC-structure of the cobalt phase.
  • the invention has been described with reference to cutting tool inserts of cemented carbide. It is obvious that the invention can be applied to coated cutting tool insert for metal cutting applications containing at least one hard constituent of a carbide, nitride and/or carbonitride of the metals Ti, Ta, Hf, Nb, V, Zr and W or solid solutions thereof in a binder phase.
  • Cutting tool inserts according to the invention with the following composition in weight-%: 91.5 WC, 3.9 Co, 3.7 Ni, 0.8 Cr, 0.1 Mo were prepared and coated with a coating consisting of 0.5 ⁇ m TiN, 5 ⁇ m Ti(C,N) and 3 ⁇ m Al 2 O 3 .
  • the TiN layer was the inner layer closest to the cemented carbide and it was deposited at a temperature of 920 °C.
  • the Ti(C,N) layer was deposited using MTCVD technique.
  • Tool life criterion Edge frittering of the work piece.
  • Cutting tool inserts according to the invention with the following composition in weight-%: 94.5 WC, 3.3 Co, 1.1 Ni, 0.6 Cr, 0.1 Mo, 0.2 VC were prepared and coated with a coating consisting of: 1.5 ⁇ m TiC, 0.5 ⁇ m Ti(C,O), 7 ⁇ m Ti(C,N) and 6 ⁇ m Al 2 O 3 .
  • the TiC layer was the innermost layer closest to the cemented carbide and the Al 2 O 3 layer was the outermost layer.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Ceramic Products (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Chemical Vapour Deposition (AREA)

Claims (4)

  1. Insert revêtu destiné à l'usinage discontinu d'acier et de fonte, constitué d'un revêtement d'une épaisseur de 3 à 16 µm comprenant au moins un élément parmi un carbure ou un carbonitrure ou un oxycarbure ou des oxynitrures ou des oxycarbonitrures de titane ou Al2O3, et d'un substrat contenant au moins un constituant dur d'un carbure, nitrure et/ou carbonitrure des métaux Ti, Ta, Hf, Nb, V, Zr et W ou bien des solutions solides de ceux-ci à une concentration en poids de 4 à 14 % de phase liante, dans lequel la phase liante est constituée, en solution solide, des éléments suivants en pourcentage en poids : Co 20 à 80, Cr 3 à 15, Mo 1 à 6 et, optionnellement, W 30 au maximum, Al 2 au maximum, Fe 70 au maximum et V jusqu'à 5, et le reste de Ni, le rapport en poids Co:Ni étant d'environ 1:1 ou d'environ 3:1.
  2. Insert revêtu selon la revendication 1, caractérisé par une zone de surface enrichie en phase liante d'une épaisseur allant jusqu'à 50 µm.
  3. Insert revêtu selon les revendications 1 ou 2, caractérisé en ce que ledit revêtement contient au moins une couche de 0,3 à 5 µm de Ti(C,O), de Ti(C,O,N) ou de Ti(N,O) à une profondeur de 0,5 à 3 µm depuis la surface du substrat.
  4. Insert revêtu selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il contient 1 à 20 % en volume de phase η ou d'une autre phase en dessous de la stoechiométrie.
EP95942809A 1994-12-30 1995-12-15 Insert en carbure fritte revetu pour applications de coupe de metal Expired - Lifetime EP0792390B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9404587 1994-12-30
SE9404587A SE513978C2 (sv) 1994-12-30 1994-12-30 Belagt hårdmetallskär för skärande metallbearbetning
PCT/SE1995/001516 WO1996021052A1 (fr) 1994-12-30 1995-12-15 Insert en carbure fritte revetu pour applications de coupe de metal

Publications (2)

Publication Number Publication Date
EP0792390A1 EP0792390A1 (fr) 1997-09-03
EP0792390B1 true EP0792390B1 (fr) 2000-03-08

Family

ID=20396539

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95942809A Expired - Lifetime EP0792390B1 (fr) 1994-12-30 1995-12-15 Insert en carbure fritte revetu pour applications de coupe de metal

Country Status (6)

Country Link
EP (1) EP0792390B1 (fr)
AT (1) ATE190363T1 (fr)
DE (1) DE69515503T2 (fr)
IL (1) IL116549A (fr)
SE (1) SE513978C2 (fr)
WO (1) WO1996021052A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6010283A (en) * 1997-08-27 2000-01-04 Kennametal Inc. Cutting insert of a cermet having a Co-Ni-Fe-binder
US6022175A (en) * 1997-08-27 2000-02-08 Kennametal Inc. Elongate rotary tool comprising a cermet having a Co-Ni-Fe binder
US6170917B1 (en) 1997-08-27 2001-01-09 Kennametal Inc. Pick-style tool with a cermet insert having a Co-Ni-Fe-binder
US6024776A (en) * 1997-08-27 2000-02-15 Kennametal Inc. Cermet having a binder with improved plasticity
US5992546A (en) * 1997-08-27 1999-11-30 Kennametal Inc. Rotary earth strata penetrating tool with a cermet insert having a co-ni-fe-binder
DE19836392A1 (de) * 1998-08-12 2000-02-17 Wolfgang Wiesener Oberflächenbeschichtung, körnige Mischung zur Zufuhr zu einer Plasmabeschichtung und Oberflächenbeschichtungsverfahren
US6575671B1 (en) 2000-08-11 2003-06-10 Kennametal Inc. Chromium-containing cemented tungsten carbide body
US6554548B1 (en) 2000-08-11 2003-04-29 Kennametal Inc. Chromium-containing cemented carbide body having a surface zone of binder enrichment
US6612787B1 (en) 2000-08-11 2003-09-02 Kennametal Inc. Chromium-containing cemented tungsten carbide coated cutting insert
JP2002166307A (ja) * 2000-11-30 2002-06-11 Kyocera Corp 切削工具
DE10213963A1 (de) * 2002-03-28 2003-10-09 Widia Gmbh Hartmetall- oder Cermet-Schneidwerkstoff sowie Verfahren zur zerspanenden Bearbeitung von Cr-haltigen Metallwerkstücken
JP7857556B2 (ja) * 2022-12-26 2026-05-13 株式会社タンガロイ 被覆超硬合金

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980002569A1 (fr) * 1979-05-17 1980-11-27 Sandvik Ab Carbure cemente

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4610931A (en) * 1981-03-27 1986-09-09 Kennametal Inc. Preferentially binder enriched cemented carbide bodies and method of manufacture
US4447263A (en) * 1981-12-22 1984-05-08 Mitsubishi Kinzoku Kabushiki Kaisha Blade member of cermet having surface reaction layer and process for producing same
SE9100227D0 (sv) * 1991-01-25 1991-01-25 Sandvik Ab Corrosion resistant cemented carbide

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980002569A1 (fr) * 1979-05-17 1980-11-27 Sandvik Ab Carbure cemente

Also Published As

Publication number Publication date
ATE190363T1 (de) 2000-03-15
SE9404587D0 (sv) 1994-12-30
SE9404587L (sv) 1996-07-01
EP0792390A1 (fr) 1997-09-03
WO1996021052A1 (fr) 1996-07-11
IL116549A0 (en) 1996-03-31
IL116549A (en) 1999-12-22
SE513978C2 (sv) 2000-12-04
DE69515503D1 (de) 2000-04-13
DE69515503T2 (de) 2000-11-23

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