WO1998040525A1 - Hartmetall- oder cermet-sinterkörper und verfahren zu dessen herstellung - Google Patents
Hartmetall- oder cermet-sinterkörper und verfahren zu dessen herstellung Download PDFInfo
- Publication number
- WO1998040525A1 WO1998040525A1 PCT/DE1998/000674 DE9800674W WO9840525A1 WO 1998040525 A1 WO1998040525 A1 WO 1998040525A1 DE 9800674 W DE9800674 W DE 9800674W WO 9840525 A1 WO9840525 A1 WO 9840525A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sintering
- platelets
- microwave
- sintered body
- hard
- Prior art date
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 45
- 239000002184 metal Substances 0.000 title claims abstract description 45
- 239000011195 cermet Substances 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title claims description 24
- 238000004519 manufacturing process Methods 0.000 title abstract description 13
- 238000005245 sintering Methods 0.000 claims abstract description 52
- 239000000843 powder Substances 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 19
- 239000011230 binding agent Substances 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims description 29
- 150000002739 metals Chemical class 0.000 claims description 22
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 20
- 229910052721 tungsten Inorganic materials 0.000 claims description 17
- 239000010937 tungsten Substances 0.000 claims description 17
- 238000009768 microwave sintering Methods 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 13
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 230000005855 radiation Effects 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 150000001247 metal acetylides Chemical class 0.000 claims description 5
- 150000004767 nitrides Chemical class 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 4
- 239000003966 growth inhibitor Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims 2
- 230000015572 biosynthetic process Effects 0.000 claims 2
- 229910017464 nitrogen compound Inorganic materials 0.000 claims 1
- 150000002830 nitrogen compounds Chemical class 0.000 claims 1
- 239000012071 phase Substances 0.000 abstract description 13
- 239000007790 solid phase Substances 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 11
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 8
- 238000009770 conventional sintering Methods 0.000 description 8
- 239000002245 particle Substances 0.000 description 7
- 229910017052 cobalt Inorganic materials 0.000 description 6
- 239000010941 cobalt Substances 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 5
- 239000012779 reinforcing material Substances 0.000 description 5
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 230000003993 interaction Effects 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 230000000737 periodic effect Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 229910009043 WC-Co Inorganic materials 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000007571 dilatometry Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000005670 electromagnetic radiation Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229910001092 metal group alloy Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052574 oxide ceramic Inorganic materials 0.000 description 2
- 239000011224 oxide ceramic Substances 0.000 description 2
- 238000002411 thermogravimetry Methods 0.000 description 2
- SDGKUVSVPIIUCF-UHFFFAOYSA-N 2,6-dimethylpiperidine Chemical compound CC1CCCC(C)N1 SDGKUVSVPIIUCF-UHFFFAOYSA-N 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- -1 Tungsten carbides Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000002902 bimodal effect Effects 0.000 description 1
- 230000037396 body weight Effects 0.000 description 1
- 238000007707 calorimetry Methods 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011143 downstream manufacturing Methods 0.000 description 1
- 238000001493 electron microscopy Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052575 non-oxide ceramic Inorganic materials 0.000 description 1
- 239000011225 non-oxide ceramic Substances 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 210000002381 plasma Anatomy 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- HHIQWSQEUZDONT-UHFFFAOYSA-N tungsten Chemical compound [W].[W].[W] HHIQWSQEUZDONT-UHFFFAOYSA-N 0.000 description 1
- 238000007514 turning Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/23—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces involving a self-propagating high-temperature synthesis or reaction sintering step
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
- C22C1/058—Mixtures of metal powder with non-metallic powder by reaction sintering (i.e. gasless reaction starting from a mixture of solid metal compounds)
-
- 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
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
Definitions
- the invention relates to a hard metal or cermet sintered body, consisting of at least one WC containing hard material phase and a binder phase as well as embedded WC platelets (plate-like reinforcing materials).
- a hard metal composite body made of hard material phases such as tungsten carbide and / or carbides or nitrides of the elements of the IVa or Va group of the periodic table, of reinforcing materials and of a binder metal phase such as cobalt, iron or nickel is known from EP 0 448 572 B1 is known as the reinforcing materials either single-crystal platelet-shaped reinforcing material made of borides, carbides, nitrides or carbonitrides of the elements of the IVa or Vla group of the periodic table or mixtures thereof or of SiC, Si 3 N, Si 2 N 2 0,
- Reinforcement materials made of SiC, Si 3 N4, Si 2 N 2 0, Al 2 0 3 , Zr0 2 ,
- A1N and / or BN has.
- the proportion of the reinforcing materials is 2 to 40% by volume, preferably 10 to 20% by volume.
- US-A-3 647 401 describes anisodimensional tungsten carbide platelets with a maximum dimension between 0.1 to 50 and a largest dimension which is at least three times as large as the smallest dimension. These platelets are bound by cobalt, which is present in an amount of 1 to 30% based on the total body weight. The body has a density of 95% of the theoretical maximum density.
- CH 522 038 describes a cemented cemented carbide body containing tungsten carbide particles, the mean grain size of which is smaller than 1 ⁇ m, at least 60% of the particles being smaller than 1 ⁇ m.
- the metal phase content is between 1 to 30% and is composed of 8 to 33% by weight of tungsten and 67 to 62% by weight of cobalt.
- the largest areas of the anisodimensional WC particles should be oriented practically parallel to a reference line.
- WO 96/22399 describes a multiphase sintered body which has a first hard phase made of carbides, nitrides, carbonitrides or carbooxynitrides of the elements of the IVa, Va or Vla metals of the periodic table.
- the second phase consists of a solid solution with particle sizes between 0.01 and 1 / im of carbides, nitrides, carbonitrides and carbooxynitrides of at least two elements of the IVa to Vla group of the periodic table.
- the binder is composed of cobalt, nickel, iron, chromium, molybdenum and tungsten, as well as mixtures thereof.
- the sintered body can contain WC platelets made of tungsten carbide with a size between 0.1 and 0.4 p, which are to be formed in situ.
- microwaves describes electromagnetic radiation in the frequency range of approximately IO 8 to 10 11 Hz (corresponding to a wavelength in a vacuum of approximately 1 mm to 1 m).
- Commercially available microwave generators generate monochromatic radiation, ie waves with a certain frequency.
- Generators with 2.45 • IO 9 Hz, which corresponds to a wavelength of 12 cm, are widespread.
- thermal radiation (Planckian radiation) has a very large frequency bandwidth and in typical sintering processes it has its energy maximum at a wavelength of 1 to 2 ⁇ m. Matter, which is exposed to electromagnetic radiation, can heat up due to the interaction with the field and thereby withdraw energy from the wave field. Since this interaction is strongly frequency-dependent, matter is also heated in the microwave field and by thermal radiation due to various heating mechanisms.
- the interaction of matter with a microwave field takes place via the electrical dipoles or free charges present in the material.
- the range of absorption properties of materials for microwaves ranges from transparent (oxide ceramics, some organic polymers) to partially transparent (oxide ceramics, non-oxide ceramics, filled polymers, semiconductors) to reflective (metals).
- the behavior of a material in the microwave field depends on the microwave frequency and to a large extent on the temperature: material that is microwave-transparent at room temperature can absorb or reflect strongly at elevated temperatures. For most substances, the depth of penetration of the microwaves is much greater than that for infrared radiation, which, depending on the sample size, has the result that the material - in contrast to "skin heating" with infrared radiation - can be heated in volume with microwaves.
- the penetration depth of microwaves with a frequency of 2.45 GHz at a temperature of 20 ° C (calculated from the measurement of the dielectric constant) is different for different substances and has the following values: 1.7 ⁇ m for aluminum, 2.5 ⁇ m for cobalt
- a sufficiently fine division of the metallic phases in a mixture with non- or semiconductor powders results in an extremely effective heating system which, microscopically speaking, is based on "ohmic losses" between the grains and high-frequency eddy currents on the single grain.
- the different behavior of solid bodies and powder-metallurgical pressed bodies in the microwave field can be clearly seen from the penetration depths cited above. More detailed investigations show that the penetration depth of the microwaves in metal or semiconductor compacts also depends on the microwave field strength and becomes significantly lower at higher power densities. This phenomenon is attributed to the shielding of the sample by electrically conductive plasmas, which are ignited in the edge area of the porous compact after the dielectric strength has been reached in the pores.
- thermofravimetry shows the thermofravimetry, the dilatometry and the dynamic differential calometry in a reaction sintering as a function of the temperature
- FIG. 3 SEM image of a structure of reaction-sintered WC-6Co hard metals made of 2.4 ⁇ m W powder, which is produced with and without VC by microwave sintering (Fig. A, c) and by conventional sintering (Fig. B, d) has been,
- Fig. 5 is a SEM image of a hard metal body according to the invention
- Fig. 1 shows schematically the structure of a suitable oven.
- the microwave with a frequency of 2.45 GHz is generated by a magnetron and guided into the metal resonator housing.
- the hard metal sinter batch is located inside the resonator and is surrounded by a microwave-transparent, thermal insulation. If the resonator is designed accordingly, the batch is in a homogeneous magnetic field and is heated homogeneously.
- the batch temperature and the coupled microwave power are used to control the microwave sintering process with a microprocessor.
- tungsten powder can no longer be carburized in a separate process step, but rather by integrating carburizing into the sintering process.
- the compacts are produced in the usual way of shaping, starting from a mixture of tungsten, carbon and cobalt powder instead of the tungsten carbide-cobalt powder mixture.
- the resulting heat of reaction contributes to additional heating in the volume of the compact and enables the sintering process to be shortened.
- 2 shows the thermogravimetry (TG, DTG), the dilatometry (DIL, DDIL) and the dynamic differential calorimetry (DSC) of a reaction sintering of a WC-6 M% Co hard metal for temperatures from 500 ° C.
- the endothermic reduction of the oxides present in the tungsten powder can be seen on the DSC signal from 750 "C, which corresponds to the corresponding decrease in mass in thermogravimetry and a first shrinkage stage of the sample in the dilatometer signal.
- reaction-sintered hard metals Due to the elimination of the separate carburization step and the shortened thermal treatment, the structure of reaction-sintered hard metals has a much finer microstructure than conventionally sintered materials.
- reaction sintering is carried out using microwave radiation (MWRS), on the one hand a further refinement of the structure is possible, and on the other hand the residual porosity can be significantly reduced compared to conventional reaction sintering (RS).
- MWRS microwave radiation
- RS conventional reaction sintering
- HV30 The Vickers hardness was 1560 after conventional sintering, 1630 after microwave sintering, 1720 after conventional reaction sintering, and 1770 after microwave reaction sintering.
- reaction sintering in particular microwave reaction sintering, this process offers great potential for simplifying and shortening the process flow and for saving energy in the production of hard metals.
- upstream and downstream process steps such as mixing, breaking, crushing, etc., are also omitted.
- a process time gain can also be achieved in this way.
- WC-6 M% Co-hard metals with differently fine tungsten powders were manufactured using conventional (RS) and microwave heating (MWRS).
- the tungsten powders used had an average grain size of 0.4 ⁇ m, 1 ⁇ m and 2.4 ⁇ m (both FSSS) with doping of 0.2 M% VC or missing VC.
- a quality with an FSSS value of 1.6 ⁇ m was used as the cobalt powder.
- the microwave reaction sintering process can thus be used to produce dense composite bodies in which WC platelets are embedded in an ultra-fine hard metal matrix with high hardness and strength. These platelets serve as a mechanical reinforcement of the hard metal and are known to increase wear resistance and impact resistance when using this composite body as a cutting material for machining.
- the present invention can be characterized as follows:
- the invention has for its object to bring about a simultaneous increase in hardness and toughness in hard metal or Cemert sintered bodies of the type mentioned.
- the method according to the invention is in no way limited to a possible unimodal initial grain size distribution; rather, powders with a wide or bimodal size distribution can also be used.
- the sintering of hard metals and cermets in the microwave field enables the structure to be refined compared to conventional sintering technology due to the heating mechanisms described and the shorter sintering times and low sintering temperatures that can be achieved as a result.
- microwave reaction sintering with mixtures of metallic tungsten powders, carbon and cobalt leads to finer structures than conventional production with WC-Co as the starting material.
- the reaction sintering of powders which contain both tungsten and carbon, but which can also contain WC in the starting mixture can be carried out completely or as partial reaction sintering, the partial proportions of the reaction sintering being between 1% and 100% (based on the complete sintering process) be.
- the grain growth in the sintered body can be controlled.
- the WC platelet growth can also be controlled via the partial proportion of the reaction sintering, as a result of which the platelet concentration in the sintered body can be controlled.
- the volume fraction of the WC platelets in the total sintered body volume is preferably up to 25 vol%.
- the platelet portion measured as the area portion of a metallographic cut, should be max. Amount to 20%, whereby all WC crystals are counted with a length / width ratio, the so-called aspect ratio of greater than 3.
- the maximum aspect ratio is preferably max. 10 + 1.
- the rate of growth can be controlled.
- Additional control options result from the addition of grain growth inhibitors, such as, in particular, VC, preferably in the size of 0.2% by mass, which promote platelet growth at the expense of giant grain growth.
- grain growth inhibitors such as, in particular, VC
- further control options can be achieved via the temperature holding times and the temperature level during sintering.
- microwave reaction sintering is that a more homogeneous structure, better compaction, i.e. a lower residual porosity can be achieved as well as shorter sintering times and lower sintering temperatures. This results in lower manufacturing costs.
- UV powder 0.2% addition of VC, 6% copowder with a grain size of 1.6 ⁇ m and a stoichiometric addition of carbon in the form of carbon black are mixed and with the addition of acetone 36 Hours were milled in a ball mill before 2% wax was then added as a pressing aid, distilled off and granulated.
- the granules were pressed into green bodies by means of die presses and heated in the microwave sintering oven at 500 ° C./hour to 900 ° C. and then with the onset of the carburization reaction heated to the sintering temperature of 1350 ° C within 10 min using microwaves. After a waiting time of 20 minutes, the sample is cooled by switching off the microwave heating.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE59801638T DE59801638D1 (de) | 1997-03-10 | 1998-03-06 | Hartmetall- oder cermet-sinterkörper und verfahren zu dessen herstellung |
EP98919052A EP0966550B1 (de) | 1997-03-10 | 1998-03-06 | Hartmetall- oder cermet-sinterkörper und verfahren zu dessen herstellung |
AT98919052T ATE206481T1 (de) | 1997-03-10 | 1998-03-06 | Hartmetall- oder cermet-sinterkörper und verfahren zu dessen herstellung |
US09/367,004 US6293986B1 (en) | 1997-03-10 | 1998-03-06 | Hard metal or cermet sintered body and method for the production thereof |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19709527 | 1997-03-10 | ||
DE19709527.5 | 1997-03-10 | ||
DE19725914.6 | 1997-06-19 | ||
DE19725914A DE19725914A1 (de) | 1997-03-10 | 1997-06-19 | Hartmetall- oder Cermet-Sinterkörper und Verfahren zu dessen Herstellung |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998040525A1 true WO1998040525A1 (de) | 1998-09-17 |
Family
ID=26034637
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1998/000674 WO1998040525A1 (de) | 1997-03-10 | 1998-03-06 | Hartmetall- oder cermet-sinterkörper und verfahren zu dessen herstellung |
Country Status (4)
Country | Link |
---|---|
US (1) | US6293986B1 (de) |
EP (1) | EP0966550B1 (de) |
AT (1) | ATE206481T1 (de) |
WO (1) | WO1998040525A1 (de) |
Cited By (1)
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RU2625922C1 (ru) * | 2016-01-29 | 2017-07-19 | Вазген Эдвардович Лорян | Реактор для получения самораспространяющимся высокотемпературным синтезом тугоплавких неорганических соединений |
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CA2409433A1 (en) * | 2002-10-23 | 2004-04-23 | Consolidated Civil Enforcement Inc. | Method of cryogenic treatment of tungsten carbide containing cobalt |
US7175687B2 (en) * | 2003-05-20 | 2007-02-13 | Exxonmobil Research And Engineering Company | Advanced erosion-corrosion resistant boride cermets |
US7384443B2 (en) * | 2003-12-12 | 2008-06-10 | Tdy Industries, Inc. | Hybrid cemented carbide composites |
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US20050211475A1 (en) | 2004-04-28 | 2005-09-29 | Mirchandani Prakash K | Earth-boring bits |
US20080101977A1 (en) * | 2005-04-28 | 2008-05-01 | Eason Jimmy W | Sintered bodies for earth-boring rotary drill bits and methods of forming the same |
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Also Published As
Publication number | Publication date |
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ATE206481T1 (de) | 2001-10-15 |
US6293986B1 (en) | 2001-09-25 |
EP0966550A1 (de) | 1999-12-29 |
EP0966550B1 (de) | 2001-10-04 |
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