EP0518840A1 - Verfahren zur Herstellung von gesinterten Carbonitridlegierungen - Google Patents

Verfahren zur Herstellung von gesinterten Carbonitridlegierungen Download PDF

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Publication number
EP0518840A1
EP0518840A1 EP92850139A EP92850139A EP0518840A1 EP 0518840 A1 EP0518840 A1 EP 0518840A1 EP 92850139 A EP92850139 A EP 92850139A EP 92850139 A EP92850139 A EP 92850139A EP 0518840 A1 EP0518840 A1 EP 0518840A1
Authority
EP
European Patent Office
Prior art keywords
binder phase
agglomerate size
powder
hard constituents
milling
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Withdrawn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
EP92850139A
Other languages
English (en)
French (fr)
Inventor
Gerold Weinl
Ake Östlund
Ulf Jutterström
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
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 Sandvik AB filed Critical Sandvik AB
Publication of EP0518840A1 publication Critical patent/EP0518840A1/de
Withdrawn legal-status Critical Current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
    • 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
    • C22C29/04—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 carbonitrides

Definitions

  • the present invention relates to a method of manufacturing sintered titanium based carbonitride alloys with powder metallurgical methods.
  • a powder with a certain agglomerate size and distribution it has turned out that lower compaction pressure as well as lower porosity can be obtained.
  • Sintered titanium based carbonitride alloys so-called cermets, are today well established as insert material in the metal cutting industry and are especially used for finishing. They contain mainly carbonitride hard constituents embedded in a binder phase.
  • the hard constituent grains generally have a complex structure with a core surrounded by a rim of other composition. Their grain size is usually ⁇ 2 ⁇ m.
  • binder phase generally contains cobalt as well as nickel.
  • the amount of binder phase is generally 5 - 25 % by weight.
  • Sintered carbonitride alloys are as conventional cemented carbide manufactured by powder metallurgical methods, namely, milling, pressing and sintering.
  • the milling is generally performed in an inorganic milling liquid and normally together with a pressing agent.
  • the object of the pressing agent is to act lubricating during the subsequent tool pressing.
  • the pressing agent also has another object, namely, to protect the fresh surfaces resulting from the milling against oxygen pick up.
  • the milling liquid is removed usually by spray drying.
  • spray drying By a proper choice of conditions during the spray drying spherical agglomerates are obtained with desired size and size distribution. These agglomerates are more or less completely covered by the pressing agent. The larger the size of the agglomerates is, the more favourable ratio surface/volume such agglomerates have. It can, thus, be expected that materials sensitive to oxygen shall have as large agglomerate size as possible in order to minimize this oxygen pick up.
  • a mean agglomerate size of 100-150 ⁇ m with a span ⁇ 2 has been found suitable. It has now surprisingly turned out that for titanium based carbonitride alloys the mean agglomerate size shall be 40-80 ⁇ m, preferably 40-60 ⁇ m and the span ⁇ 1.5, preferably ⁇ 1.2. In this way lower compaction pressure and less porosity is obtained than if the usual mean agglomerate size for conventional cemented carbide is used.
  • High compaction pressure is linked to an increased risk for the generation of cracks as well as uneven density distribution in connection with the compaction.
  • the presence of cracks and uneven density distribution can lead to problems with crack generation as well as deviations in dimension in the sintered carbonitride alloy.
  • the presence of pores also can result in deviations in dimensions and influence on the mechanical properties of the finished alloy.
  • agglomerate porosity i.e., the original agglomerates are visible and material has not filled the voids between them.
  • Such porosity can be very disastrous since these pores are relatively large, on one hand, and can be angular and have a strong notch effect, on the other.
  • Carbonitride alloys as such are from a general point of view more brittle than cemented carbide and have more difficulty to stop possible cracks. They are, thus, more notch sensitive than cemented carbide.
  • the present invention thus, relates to a way of manufacturing carbonitride alloys using a powder with a mean agglomerate size which is considerably smaller that the size which has turned out to be suitable for conventional cemented carbide.
  • a powder with a mean agglomerate size which is considerably smaller that the size which has turned out to be suitable for conventional cemented carbide.
  • Titanium based carbonitride alloys with the following composition in weight-% 15 W, 39.2 Ti, 5.9 Ta, 8.8 Mo, 11.5 Co, 7.7 Ni, 9.3 C, 2.6 N were manufactured with an agglomerate size of 125 ⁇ m and span 1.8, A, and with an agglomerate size of 55 ⁇ m and span 1.1, B, (according to the invention).
  • the compaction pressure was measured and after sintering the porosity was evaluated. Sintering took place in vacuum at 1430°C for 90 min.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
EP92850139A 1991-06-12 1992-06-10 Verfahren zur Herstellung von gesinterten Carbonitridlegierungen Withdrawn EP0518840A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9101799A SE500048C2 (sv) 1991-06-12 1991-06-12 Sätt att tillverka sintrade karbonitridlegeringar
SE9101799 1991-06-12

Publications (1)

Publication Number Publication Date
EP0518840A1 true EP0518840A1 (de) 1992-12-16

Family

ID=20383013

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92850139A Withdrawn EP0518840A1 (de) 1991-06-12 1992-06-10 Verfahren zur Herstellung von gesinterten Carbonitridlegierungen

Country Status (2)

Country Link
EP (1) EP0518840A1 (de)
SE (1) SE500048C2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4340652A1 (de) * 1993-11-30 1995-06-01 Krupp Widia Gmbh Verbundwerkstoff und Verfahren zu seiner Herstellung
CN109576545A (zh) * 2018-12-12 2019-04-05 南京航空航天大学 一种具有混晶结构的Ti(C,N)基金属陶瓷及其制备方法
US10731237B1 (en) * 2016-09-23 2020-08-04 United States Of America As Represented By The Administrator Of National Aeronautics And Space Administration Ultra high temperature ceramic coatings and ceramic matrix composite systems

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971656A (en) * 1973-06-18 1976-07-27 Erwin Rudy Spinodal carbonitride alloys for tool and wear applications
EP0368336A2 (de) * 1988-11-11 1990-05-16 Mitsubishi Materials Corporation Schneidkörperblatt und Verfahren zu dessen Herstellung
EP0425061A2 (de) * 1989-10-23 1991-05-02 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Hartmetall auf der Basis von Titankarbonitrid

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971656A (en) * 1973-06-18 1976-07-27 Erwin Rudy Spinodal carbonitride alloys for tool and wear applications
EP0368336A2 (de) * 1988-11-11 1990-05-16 Mitsubishi Materials Corporation Schneidkörperblatt und Verfahren zu dessen Herstellung
EP0425061A2 (de) * 1989-10-23 1991-05-02 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Hartmetall auf der Basis von Titankarbonitrid

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4340652A1 (de) * 1993-11-30 1995-06-01 Krupp Widia Gmbh Verbundwerkstoff und Verfahren zu seiner Herstellung
US6124040A (en) * 1993-11-30 2000-09-26 Widia Gmbh Composite and process for the production thereof
DE4340652C2 (de) * 1993-11-30 2003-10-16 Widia Gmbh Verbundwerkstoff und Verfahren zu seiner Herstellung
US10731237B1 (en) * 2016-09-23 2020-08-04 United States Of America As Represented By The Administrator Of National Aeronautics And Space Administration Ultra high temperature ceramic coatings and ceramic matrix composite systems
CN109576545A (zh) * 2018-12-12 2019-04-05 南京航空航天大学 一种具有混晶结构的Ti(C,N)基金属陶瓷及其制备方法
CN109576545B (zh) * 2018-12-12 2020-09-25 南京航空航天大学 一种具有混晶结构的Ti(C,N)基金属陶瓷及其制备方法

Also Published As

Publication number Publication date
SE9101799L (sv) 1992-12-13
SE500048C2 (sv) 1994-03-28
SE9101799D0 (sv) 1991-06-12

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