EP0563203B1 - Method of producing a sintered carbonitride alloy for intermittent machining of materials difficult to machine - Google Patents
Method of producing a sintered carbonitride alloy for intermittent machining of materials difficult to machine Download PDFInfo
- Publication number
- EP0563203B1 EP0563203B1 EP92901893A EP92901893A EP0563203B1 EP 0563203 B1 EP0563203 B1 EP 0563203B1 EP 92901893 A EP92901893 A EP 92901893A EP 92901893 A EP92901893 A EP 92901893A EP 0563203 B1 EP0563203 B1 EP 0563203B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- carbonitride
- alloy
- metals
- complex
- carbon
- 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
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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
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- 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 producing 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 traditional 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 compensated for by a higher content of group VI metals i.e. in principle Mo and W and by higher carbon content.
- group VI metals i.e. in principle Mo and W and by higher carbon content.
- the higher content of Mo, W and C has inter alia the advantage that the wetting against the binderphase is improved i.e. the sintering is facilitated.
- 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 element 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 complex carbonitride solid solution comprising also the group VI element(s), milling said solid solution to obtain a carbonitride powder which is mixed with Co and/or Ni and sintered.
- the invention is defined in claim 1.
- titanium and tantalum shall be present in the raw material according to the invention.
- vanadium, niobium and suitably also zirconium and hafnium are present in the complex carbonitride form if they are part of the finished sintered alloy.
- the raw material accordinging to the invention is produced directly by carbonitriding of the oxides of the metals or the metals themselves.
- a carbonitride 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 addition, if any, and minor additions of e.g. TiC, TiN, TaC, VC or combinations thereof due to small deviations in composition of the complex raw material whereafter 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 metals are V, Nb and/or Ta.
- the window comprises the composition area: 0.84 ⁇ X IV ⁇ 0.97 0.44 ⁇ X C ⁇ 0.55 and in particular: 0.86 ⁇ X IV ⁇ 0.95 0.46 ⁇ X C ⁇ 0.53
- the latter restricted window can be divided into two, one without other group V metals than Ta: 0.905 ⁇ X IV ⁇ 0.95 0.46 ⁇ X C ⁇ 0.53 and another one with other group V elements than Ta i.e. V and Nb: 0.86 ⁇ X IV ⁇ 0.905 0.46 ⁇ X C ⁇ 0.53
- the invention comprises stoichiometric 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 (Ti 0.88 , Ta 0.06 , Nb 0.06 ) (C 0.51 , N 0.49 ) as well as with the use of simple raw material: TiN, TiC and VC. In both cases also WC and Mo 2 C were added in addition to Co and Ni. The following compaction pressure and porosity after milling and sintering to the same grain size were obtained: Compaction Porosity pressure, N/mm 2 Alloy according to the invention A00 154 Simple raw materials A06-A08 206 B04
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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)
- Ceramic Products (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
Abstract
Description
- The present invention relates to a method of producing 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 traditional 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 compensated for by a higher content of group VI metals i.e. in principle Mo and W and by higher carbon content. The higher content of Mo, W and C has inter alia the advantage that the wetting against the binderphase is improved i.e. the sintering is facilitated. As a raw material a carbonitride of titanium and a group VI metal is used.
- By changing the raw material it is possible to vary the core-rim-composition. In e.g. Swedish Patent Specification 459 862 it is shown how it is possible to use (Ti,Ta)C as a raw material to get a duplex structure with cores with a high content of titanium and tantalum but low content of nitrogen. The surrounding rims have higher contents of group VI-metals, i.e. molybdenum and tungsten and higher contents of nitrogen than the cores. This leads inter alia to an improved resistance against plastic deformation.
- Furthermore, it has in Swedish Patent Application 8902306-3 been shown how by mixing various types of core-rim structures in one and the same alloy advantages and drawbacks can be balanced out in such a way that optimized alloys are obtained.
- EP-A-259192 discloses a sintered alloy comprising a mixed carbonitride of titanium and at least one element 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 complex carbonitride solid solution comprising also the group VI element(s), milling said solid solution to obtain a carbonitride powder which is mixed with Co and/or Ni and sintered.
- It has now turned out that unique structures as well as unique properties are obtained in producing sintered titaniumbased carbonitride alloys if one uses complex cubic carbonitride raw material consisting of metals from groups IV and V of the periodic system and carbon and nitrogen as the main part of the powder mixture such that >95% of the amount of the metals in the finished alloy come from the said complex carbonitride. At least two, preferably at least three from the groups IV and V metals are present in the finished sintered carbonitride alloy. Preferably all of the nitrogen shall be present in the mentioned carbonitride raw material.
- The invention is defined in
claim 1. - In particular, as the above-mentioned metals titanium and tantalum shall be present in the raw material according to the invention. Preferably also vanadium, niobium and suitably also zirconium and hafnium are present in the complex carbonitride form if they are part of the finished sintered alloy. Metals from group VI, Cr, Mo and W, shall, if they are present, be added as multiple carbides, single carbides and/or as metal+carbon.
- The raw material acording to the invention is produced directly by carbonitriding of the oxides of the metals or the metals themselves. As a result a carbonitride powder with essentially equiaxial grains and a narrow grain size distribution is obtained with a mean grain size of 0.8 - 3 µm, preferably 1 - 2 µm.
- As mentioned interesting properties of a sintered carbonitride alloy are obtained if the special raw materials according to this invention are used. Thus, it has turned out that a carbonitride alloy with extremely positive properties at intermittent machining of materials difficult to machine which materials have a tendency to clad if a raw material with e.g. the composition (Ti0.93,Ta0.07) (C0.48,N0.52) is used. This effect is further increased if in addition vanadium is added whereby the corresponding formula will be (Ti0.88,Ta0.06,V0.06)(C0.51,N0.49). Corresponding inserts made from simple raw materials and in exactly the same equipment give considerably decreased properties in toughness inter alia greater scatter at the same wear resistance. This means that the reliability of such inserts is considerably decreased which means that they are not as efficient when producing with limited manning a production form with increased importance due to increasing labour costs.
- One of the reasons for this positive behaviour has turned out to be that a considerably lower porosity level is obtained with this complex raw material compared to conventional raw materials without having to use any other means such as HIP and this with even lower compaction pressure than for conventional material. This is a great advantage from production point of view inter alia due to reduced tool wear and considerably lower risk for unfavourable pressing cracks.
- 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 addition, if any, and minor additions of e.g. TiC, TiN, TaC, VC or combinations thereof due to small deviations in composition of the complex raw material whereafter 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 metals are V, Nb and/or Ta.
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-
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- For titanium the following applies xTi>0.7 preferably xTi>0.75.
- In the above given molar ratios for carbon and nitrogen usual amounts of oxygen may be present i.e. substitute carbon and nitrogen even if it is desirable to keep such amounts of oxygen low <0.8 %, preferably <0.5 %. The invention comprises stoichiometric 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 (Ti0.88, Ta0.06, Nb0.06) (C0.51, N0.49) as well as with the use of simple raw material: TiN, TiC and VC. In both cases also WC and Mo2C were added in addition to Co and Ni. The following compaction pressure and porosity after milling and sintering to the same grain size were obtained:
Compaction Porosity pressure,
N/mm2Alloy according to the invention A00 154 Simple raw materials A06-A08 206 B04
Claims (1)
- Method of making a sintered titanium based carbonitride alloy for fine machining with 3 - 25 weight % binder phase by milling, pressing and sintering of a powder mixture according to known powder metallurgical technique in which the main part of said powder mixture is a complex cubic carbonitride powder consisting of metals from groups IV and V of the periodic system and carbon and nitrogen, more than 95 % of the amount of said metals in the finished alloy coming from said complex carbonitride and said complex carbonitride having the composition
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9004119 | 1990-12-21 | ||
SE9004119A SE9004119D0 (en) | 1990-12-21 | 1990-12-21 | PREPARED FOR PREPARATION OF A SINTERED CARBON NITROGEN ALLOY FOR INTERMITTENT PROCESSING OF REPLACED MATERIALS |
PCT/SE1991/000888 WO1992011396A1 (en) | 1990-12-21 | 1991-12-19 | Method of producing a sintered carbonitride alloy for intermittent machining of materials difficult to machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0563203A1 EP0563203A1 (en) | 1993-10-06 |
EP0563203B1 true EP0563203B1 (en) | 1997-04-09 |
Family
ID=20381289
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92901893A Expired - Lifetime EP0563203B1 (en) | 1990-12-21 | 1991-12-19 | Method of producing a sintered carbonitride alloy for intermittent machining of materials difficult to machine |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0563203B1 (en) |
JP (1) | JPH06504588A (en) |
AT (1) | ATE151473T1 (en) |
DE (1) | DE69125626T2 (en) |
SE (1) | SE9004119D0 (en) |
WO (1) | WO1992011396A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040035246A1 (en) * | 2000-12-19 | 2004-02-26 | Mitsuo Kuwabara | Composite material |
CN109338196B (en) * | 2018-11-30 | 2020-12-11 | 岭南师范学院 | Ti (C, N) -based metal ceramic and preparation method and application thereof |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU501073B2 (en) * | 1974-10-18 | 1979-06-07 | Sumitomo Electric Industries, Ltd. | Cemented carbonitride alloys |
US4769070A (en) * | 1986-09-05 | 1988-09-06 | Sumitomo Electric Industries, Ltd. | High toughness cermet and a process for the production of the same |
-
1990
- 1990-12-21 SE SE9004119A patent/SE9004119D0/en unknown
-
1991
- 1991-12-19 DE DE69125626T patent/DE69125626T2/en not_active Expired - Fee Related
- 1991-12-19 JP JP4501799A patent/JPH06504588A/en active Pending
- 1991-12-19 EP EP92901893A patent/EP0563203B1/en not_active Expired - Lifetime
- 1991-12-19 WO PCT/SE1991/000888 patent/WO1992011396A1/en active IP Right Grant
- 1991-12-19 AT AT92901893T patent/ATE151473T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE69125626T2 (en) | 1997-07-24 |
JPH06504588A (en) | 1994-05-26 |
SE9004119D0 (en) | 1990-12-21 |
EP0563203A1 (en) | 1993-10-06 |
ATE151473T1 (en) | 1997-04-15 |
WO1992011396A1 (en) | 1992-07-09 |
DE69125626D1 (en) | 1997-05-15 |
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