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
• • 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
  • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
  • B22F1/09—Mixtures of metallic powders
• • 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
  • B22F9/00—Making metallic powder or suspensions thereof
  • B22F9/02—Making metallic powder or suspensions thereof using physical processes
  • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling

Definitions

• the present invention relates to a method of produ ⁇ cing a sintered carbonitride alloy with titanium as main constituent particularly suited for intermittent machining of materials difficult to machine.
• Sintered carbonitride alloys based on mainly titanium usually referred to as cermets have during the last years increased their use at the expense of more tra ⁇ ditional cemented carbide i.e. tungsten carbide based alloys.
• US 3,971,656 discloses the production of an alloy with a duplex hard constituent where the core has a high content of Ti and N and the surrounding rim has a lower content of these two elements which is com- pensated for by a higher content of group VI metals i.e. in principle Mo and and by higher carbon con ⁇ tent.
• group VI metals i.e. in principle Mo and and by higher carbon con ⁇ tent.
• the higher content of Mo, and C has inter alia the advantage that the wetting against the bin- derphase is improved i.e. the sintering is facili- tated.
• As a raw material a carbonitride of titanium and a group VI metal is used.
• EP-A-259192 discloses a sintered alloy comprising a mixed carbonitride of titanium and at least one ele ⁇ ment from the group consisting of group IV, V and VI elements except titanium in a binder phase based on Co and/or Ni.
• the alloy is produced by mixing powders of the hard constituents, heating the mixture in a nitrogen atmosphere at a temperature of at least the sintering temperature to form a solid solution, mil ⁇ ling said solid solution to obtain a carbonitride powder which is mixed with Co and/or Ni and sintered.
• tita ⁇ nium and tantalum shall be present in the raw mate ⁇ rial according to the invention.
• SUBSTITUTE SHEET nium are present if they are part of the finished sintered alloy.
• the raw material accordinging to the invention is produ ⁇ ced directly by carbonitriding of the oxides of the metals or the metals themselves.
• a carbo ⁇ nitride powder with essentially equiaxial grains and a narrow grain size distribution is obtained with a mean grain size of 0.8 - 3 ⁇ m, preferably 1 - 2 ⁇ m.
• the invention thus relates to a method of producing a titanium based carbonitride alloy with 3-25 % by weight binderphase based on Co, Ni and/or Fe using the above mentioned complex raw material.
• This raw material is milled together with carbides from group VI, if any, and binderphase elements and carbon addi ⁇ tion, if any, and minor additions of e.g. TiC, TiN, TaC, VC or combinations thereof due to small devia- tions in composition of the complex raw material whe ⁇ reafter compaction and sintering, preferably in an inert atmosphere, is performed according to known technique.
• Fig 1 shows the 'window' in the composition diagram for Group IV-Group V - C-N, expressed in molar ratio, of the complex raw material which shows the above mentioned advantages in high magnification, whereas fig 2 shows where in the total molar ratio diagram this small area is situated.
• Group IV metals are Ti, Zr and/or Hf and Group V me ⁇ tals are V, b and/or Ta.
• the window comprises the composition area:
• the latter restricted window can be divided into two, one without other group V metals than Ta:
• oxygen may be present i.e. sub ⁇ stitute carbon and nitrogen even if it is desirable to keep such amounts of oxygen low ⁇ 0.8 %, preferably ⁇ 0.5 %.
• the invention comprises ⁇ toichiometric as well as usually substoichiometric carbonitrides.
• Titanium-based carbonitride alloys with 17.5 % Ni+Co binder phase were produced with the use of a complex raw material according to the invention

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Powder Metallurgy (AREA)
• Ceramic Products (AREA)
• Cutting Tools, Boring Holders, And Turrets (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20381289

Family Applications (1)

Country Status (6)

Families Citing this family (2)

Citations (2)

• 1990
  • 1990-12-21 SE SE9004119A patent/SE9004119D0/xx unknown
• 1991
  • 1991-12-19 DE DE69125626T patent/DE69125626T2/de not_active Expired - Fee Related
  • 1991-12-19 AT AT92901893T patent/ATE151473T1/de not_active IP Right Cessation
  • 1991-12-19 WO PCT/SE1991/000888 patent/WO1992011396A1/en active IP Right Grant
  • 1991-12-19 JP JP4501799A patent/JPH06504588A/ja active Pending
  • 1991-12-19 EP EP92901893A patent/EP0563203B1/de not_active Expired - Lifetime

Patent Citations (2)

Also Published As

Similar Documents

Legal Events