EP1095168A1 - Corps en metal dur ou en cermet, et son procede de production - Google Patents

Corps en metal dur ou en cermet, et son procede de production

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Publication number
EP1095168A1
EP1095168A1 EP99941397A EP99941397A EP1095168A1 EP 1095168 A1 EP1095168 A1 EP 1095168A1 EP 99941397 A EP99941397 A EP 99941397A EP 99941397 A EP99941397 A EP 99941397A EP 1095168 A1 EP1095168 A1 EP 1095168A1
Authority
EP
European Patent Office
Prior art keywords
phase
nitrogen
cermet
mass
sintering temperature
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.)
Granted
Application number
EP99941397A
Other languages
German (de)
English (en)
Other versions
EP1095168B1 (fr
Inventor
Limin Chen
Walter Lengauer
Hans Werner Daub
Klaus Dreyer
Dieter Kassel
José Garcia
Georg Korb
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.)
Widia GmbH
Original Assignee
Widia GmbH
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
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Priority claimed from DE19845376A external-priority patent/DE19845376C5/de
Priority claimed from DE1999122057 external-priority patent/DE19922057B4/de
Application filed by Widia GmbH filed Critical Widia GmbH
Publication of EP1095168A1 publication Critical patent/EP1095168A1/fr
Application granted granted Critical
Publication of EP1095168B1 publication Critical patent/EP1095168B1/fr
Anticipated expiration legal-status Critical
Revoked 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
    • 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
    • C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
    • 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
    • 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
    • C22C29/06—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 carbides, but not containing other metal compounds
    • C22C29/08—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 carbides, but not containing other metal compounds based on tungsten carbide
    • 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
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12014—All metal or with adjacent metals having metal particles
    • Y10T428/12028—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]

Definitions

  • the invention relates to a hard metal or cermet body with a hard phase consisting of WC and / or at least one carbide, nitride, carbonitride and / or oxicarbonitride of at least one of the elements of the IVa, Va or Vla group of the periodic table and a binder metal phase Fe, Co and / or Ni, the proportion of which is 3 to 25% by mass.
  • the invention further relates to a method for producing such a hard metal or cermet body by mixing, grinding, granulating and pressing a starting mixture containing corresponding constituents and then sintering.
  • EP 0 344 421 A1 proposes a cermet which should either have an average grain size of the hard material phase in the surface layer compared to a core with a penetration depth of 0.05 mm, which is between 0.8 and 1.2 times that average grain size of the hard material phase in the cermet core or in the same penetration depth relates to a binder phase which corresponds to 0.7 to 1.2 times the average binder content of the cermet core or in which the hardness in the aforementioned penetration depth between the 0.95 and 1.1 times the average hardness of the cermet core.
  • the starting mixture is sintered after grinding, mixing and pre-pressing, sintering in a first stage up to 1300 ° C or below under vacuum or an inert gas atmosphere, while in a second stage above 1300 ° C at a nitrogen pressure of 0.1 to 20 torr (13.3 Pa to 2.66 x 10 3 Pa) is sintered, and the nitrogen pressure should also rise with increasing temperature.
  • EP 0 368 336 B1 describes a cermet substrate with a hard surface layer in which the region with the maximum hardness is present at a depth between 5 ⁇ m and 50 ⁇ m from the substrate surface, and the substrate surface has a hardness of 20 to 90% of the maximum Hardness.
  • the pre-pressed mixture is subjected to an initial temperature increase to 1100 ° C. in a vacuum, a subsequent temperature increase from 1100 ° C. to a temperature range between 1400 ° C. and 1500 ° C. in a nitrogen atmosphere, and a subsequent sintering in a vacuum.
  • EP 0 374 358 B1 describes a process for producing a cermet with 7 to 20% by weight binder phase and a hard phase made of titanium carbide, titanium nitride and / or titanium carbonitride with 35 to 59% by weight Ti, 9 to 29% by weight W, 0.4 to 3.5% by weight Mo, 4 to 24% by weight of at least one metal from Ta, Nb, V and Zr, 5.5 to 9.5% by weight N 2 and 4, 5 to 12 wt .-% C.
  • the formulated, mixed, dried and pre-pressed mass is sintered in such a way that the temperature is raised to 1350 ° C. in vacuo, the nitrogen atmosphere being set to 1 Torr (133 Pa) at 1350 ° C. , the nitrogen partial pressure is gradually increased together with the temperature increase from 1350 ° C. to the sintering temperature, the nitrogen atmosphere being set to 5 Torr (665 Pa) at the sintering temperature.
  • EP 0 492 059 A2 describes a cermet body whose hardness is at a penetration depth of not less than 1 mm higher than in the interior of the cermet, the binder content in a layer thickness of 0.5 to 3 ⁇ m compared to the core substrate being able to be minimized.
  • the cermet should have a hard material coating in a thickness of 0.5 to 20 ⁇ m made of carbides, nitrides, oxides and borides of titanium and A1 2 0 3 .
  • a green body is first heated to a temperature between 1100 ° C and 1400 ° C under vacuum, then nitrogen gas let in up to a pressure at which the partial nitrogen pressure is between 5 and 10 Torr (665 and 1330 Pa), so that the substrate surface is denitrified.
  • the sintering and the final cooling are carried out under a non-oxidizing atmosphere, such as a vacuum or an inert gas atmosphere.
  • the body is coated using CVD or PVD.
  • EP 0 499 223 suggests that the relative concentration of the binder in a 10 ⁇ m-thick layer near the surface be 5 to 50% of the average mean content of binder in the cermet core and in the layer below it from 10 ⁇ m to 100 ⁇ m penetration depth adjust the binder content to 70 to 100% relative to the cermet core.
  • the sintering is carried out under nitrogen gas at a constant pressure of 5 to 30 Torr (665 to 3.99 x 10 3 Pa) and the cooling under vacuum at a cooling rate of 10 to 20 ° C / min.
  • EP 0 519 895 A1 discloses a cermet with a three-layer edge zone in which the first layer extends to a depth of 50 ⁇ m TiN, the next layer from 50 to 150 ⁇ m penetration depth with a binder enrichment and the next layer from 150 ⁇ m to 400 ⁇ m is formed with a binder depletion relative to the interior of the cermet core.
  • the sintered body is in an atmosphere of N 2 and / or NH 3, possibly in combination with CH 4 , CO, C0 2 at 1100 ° C to 1350 ° C for 1 to 25 hours at atmospheric pressure or a pressure above 1.1 bar ( 1.1 x 10 5 Pa) treated.
  • the cermets known from the prior art either have different binder contents on the surface, which is recognizable by their spotty appearance, or tend to adhere. tings of the binder with the sintered base, which leads to changes in the composition in the contact zone due to the associated reaction.
  • Another disadvantage of the cermets known to date in the prior art is the poor adhesion of wear protection layers applied to the surface when the binder metal content is increased. If there is an increased nickel content in the surface, no CVD coating is possible at all.
  • a cermet is therefore proposed in DE 44 23 451 AI which has a hard material content of 95 to 75% by mass and 5 to 25% by mass of Co and / or Ni binder, the hard material phase consisting of carbonitrides with cubic Bl -Crystalline structure exists and 30 to 60 mass% Ti, 5 to 25 mass% W, 5 to 15 mass% Ta, of which up to 70 mass% can be replaced by Nb, 0 to 12 mass% Mo, 0 to 5 mass% V , 0 to 2 mass% Cr, 0 to 1 mass% Hf and / or Zr contains.
  • the (C + N) content in the carbonitride phase should be> 80 mol%, the nitrogen content N / (C + N) being between 0.15 and 0.7.
  • the content of the binder phase in relation to the underlying cermet core area is less than 30% by mass.
  • the titanium content is 1.1 to 1.3 times as large as in the underlying cermet core areas, whereas the sum of the contents of tungsten, tantalum and any proportions of molybdenum, niobium, vanadium and / or chromium in only 0 , 7 to 1 times the amount relative to the underlying cermet core areas.
  • the relative content of binder phase is 90% by mass
  • the relative Ti content is 100% to 120%
  • the sum of the contents of tungsten, tantalum and possibly molybdenum, niobium, vanadium, chromium is between 80 in the same surface zone % By mass and 110% by mass, each relative to the core of the cermet.
  • This edge structure according to the above-mentioned document is produced by a process for cermet production, according to which the green compact produced by mixing, milling, granulating and pressing is first heated to the melting point of the binder phase under vacuum with a pressure below 10 "1 mbar (10 Pa).
  • EP 0 687 744 A2 also describes a nitrogen-containing sintered hard metal alloy with at least 75% by weight and a maximum of 95% by weight of hard phase, which contains titanium, an element from the Via group of the periodic table and WC, the remainder of the binder phase made of nickel and cobalt.
  • the alloy has 5% by weight to 60% by weight of titanium in the form of TiC and 30% by weight to 70% by weight of a metal in the form of a metal carbide.
  • the cemented carbide alloy should have a soft, outermost surface layer, which consists of a binder phase and WC. Under this outermost layer is a 3 ⁇ m to 30 ⁇ m thick layer, which should consist essentially of WC with a low proportion of binder metal.
  • a sintered hard metal alloy of the composition mentioned at the outset likewise describes EP 0 822 265 A2.
  • the sintered body produced from this should have an edge region which is divided into three layers, of which the outermost layer has a WC content between 0 and 30% by volume, the remainder of the binder phase middle layer 50 vol .-% to 100 vol .-% WC, rest of the binder phase, and a third bottom layer has a WC volume fraction between 0 and 30 vol .-%, rest of the binder.
  • covalent hard materials such as e.g. Diamond, cubic boron nitride, carbon nitride, fullerenes and metallic hard materials (carbides, nitrides, carbonitrides or oxicarbonitrides of the elements of the IVa to Vla group of the periodic table) as well as other layers which contain at least one of the elements B, C, N or 0 , guaranteed.
  • a hard metal or cermet body according to claim 1 which according to the invention is characterized in that WC crystallites protrude from the body surface by 2 to 20 ⁇ m, preferably 5 to 10 ⁇ m.
  • a coarse-grained surface morphology is created by these crystals, which creates the adhesion of applied surface layers by interlocking the crystallites with the deposited phases.
  • These WC crystallites are so firmly integrated into the near-surface edge zone that they did not break out even during trial grinding work. The created surface roughness thus provides an ideal “anchorage" for the application of surface coatings.
  • the proportion of WC in the total hard material phase of the hard metal or cermet body is at least 50% by mass and a maximum of 96% by mass.
  • the WC crystallites are preferably on the Body edge zone or surface connected with up to 50 vol .-% of a cubic phase of another hard material of different composition and binding metal parts.
  • This cubic phase can essentially consist of carbides, nitrides, carbonitrides and / or oxicarbonitrides of at least one of the IVa, Va and / or Vla elements (except W) of the periodic system.
  • the cubic phase can be single or multi-phase, in particular, for example, consist of Ti (C, N) and (Ti, W) C.
  • metals from the IVa, Va and / or Vla group of the periodic table preferably W, Ta, Nb, Mo and Cr
  • metals from the IVa, Va and / or Vla group of the periodic table can also be incorporated into the structure of the hard metal or cermet body, in particular in the edge zone near the body surface.
  • the cubic phases in the edge zone can each have a homogeneous structure or a local core-edge structure, as is known in principle from cermets.
  • the present invention particularly includes cermet bodies whose phases with a cubic crystal structure 30 to 60 mass% titanium, 5 to 15 mass% tantalum and / or niobium, 0 to 12 mass% molybdenum, 0 to 5 mass% vanadium, 0 to 2 masses % Chromium, 0 to 1% by mass hafnium and / or zirconium, with up to 2% aluminum and / or metallic tungsten, titanium, molybdenum, vanadium and / or chromium being dissolved in the binder phase.
  • the edge zones near the surface can be constructed essentially homogeneously or have a gradient in the composition or surface zones near the surface of different compositions, an essentially first in an outer layer adjoining the body surface and reaching to a depth of between 2 ⁇ m and 3 ⁇ m Binder phase-free carbonitride phase is located, which adjoins an underlying middle layer with a thickness of 5 ⁇ m to 150 ⁇ m from an essentially pure WC-Co composition, and what is a third bottom layer with a thickness of connects at least 10 microns and a maximum of 650 microns, the proportions of the binder phase and the IVa and / or Va elements increase to the substantially constant value present inside the body and the tungsten proportion drops to the essentially constant value inside the body.
  • the different layers of the sintered body described above merge continuously, titanium being preferably used as the metal of the carbonitride phase.
  • the content of titanium and / or a further element of the IVa to Vla group of the periodic table, with the exception of tungsten, is maximum in the outer layer, then drops steeply to a minimum value during the transition to the middle layer and increases during the transition to the third lowest layer to a depth of penetration of approx. 800 ⁇ m from the surface gradually increases to an average value corresponding to the proportion of the total composition inside the body, which is below the titanium or other metal content in the outer layer.
  • the nitrogen content in the middle layer is minimal and increases to proportions above the average nitrogen content of the alloy which are present in the core interior as the transition to the outermost layer occurs.
  • the hard phase WC can possibly only be formed from (Ti, W) C or (Ti, W) (C, N) during sintering.
  • the binder phase content in the middle layer is preferably at most 0.9 times the binder phase content in the interior of the body, while the tungsten content in this middle layer is at least 1.1 times the tungsten content in the interior of the body.
  • edge zone areas are also possible in which the individual layers are not sharply separated from one another, but rather the respective metal and non-metallic Gradually change the proportion of tallies in the alloy over wide transition areas.
  • the body characterized according to claim 9 fulfills the following conditions in three layers forming the edge region:
  • the tungsten and binder phase components are at most 0.8 times that of the total composition resulting portion.
  • the proportion of tungsten and the binder phase towards the inside of the body essentially increases continuously, whereas the proportion of nitrogen towards the inside of the body essentially decreases continuously.
  • the tungsten and binder phase contents pass through a maximum and the contents of elements of the IVa and / or Va group of the periodic table pass through a minimum.
  • the tungsten and binder phase components drop to essentially constant values inside the body, which correspond to the component in the overall composition, and the contents of elements the IVa and Va groups of the periodic table, in particular titanium, rise to essentially constant values.
  • the nitrogen content remains essentially constant during the transition from the middle layer to the lowest layer down to the inside of the body.
  • the alloys of the bodies according to the invention can contain up to 2% by mass of chromium and / or molybdenum and in the hard material phase TiCN in an amount between 3 to 40% by mass of TiCN or up to 40% by mass of TiC and / or TiN.
  • the hard metal or cermet body according to the invention is preferably provided with at least one hard material layer and / or one ceramic layer (A1 2 0 3 ) or diamond, cubic boron nitride or similar layers.
  • nitrogen-free mixtures of hard materials and binding metals these are pre-pressed into a green body and first heated to a temperature between 1200 ° C and the sintering temperature in a vacuum up to about 1200 ° C and then in an inert gas atmosphere, after which at least temporarily at least when the sintering temperature is reached a nitrogen and possibly carbon-containing atmosphere is set at a pressure between 10 3 and 10 7 Pa, preferably between 5 x 10 3 Pa and 5 x 10 4 Pa. If the sintering temperature has not already been reached, the temperature is still increased to this temperature and maintained for a holding time of at least 20 minutes or only a slight cooling of at most 2 ° C./min is carried out in this time of at least 20 minutes. When the sintered body is finally cooled, the set nitrogen and possibly carbon-containing gas atmosphere is maintained until at least 1000 ° C is reached.
  • the nitrogen-containing gas can also be introduced into the furnace atmosphere at a later time, at the latest when the sintering temperature is reached and depending on the nitrogen content in the starting mixture. In any case It must be ensured via the process control and / or the starting mixture that there are sufficiently high proportions of carbon and tungsten to form the WC crystallites on the surface. Possibly. the sinter holding time must be extended accordingly.
  • the nitrogen and possibly carbon-containing atmosphere by introducing precursors, i.e. Nitrogen and possibly carbon-containing gases or possibly also by carbon-containing crucible materials in such a way that nitrogen and carbon are formed in situ under the prevailing temperature and pressure.
  • precursors i.e. Nitrogen and possibly carbon-containing gases or possibly also by carbon-containing crucible materials in such a way that nitrogen and carbon are formed in situ under the prevailing temperature and pressure.
  • the size and frequency of the WC crystallites can be influenced with the period of time and with the gas composition at which the sintered body is above eutectic temperatures. Longer treatment times and a higher proportion of carbon lead to larger and / or more frequently occurring WC crystallites.
  • the sintered body is heated to 1200 ° C. during the heating phase and this temperature is held for a period of at least 20 minutes, preferably more than one hour, before the further heating to the sintering temperature is continued.
  • an inert gas atmosphere for example an inert gas atmosphere.
  • the inert gas pressure of 10 3 to 10 4 Pa is maintained until the sintering temperature is reached, after which an atmosphere containing nitrogen and possibly carbon is set at a higher pressure of more than 10 4 Pa above 1450 ° C., preferably close to 1500 ° C. .
  • the sintered body made of a hard metal or a cermet can be subjected to a "pendulum annealing" after holding the sintering temperature for at least 0.5 hours, i.e. a temperature control in which the eutectic melting point is oscillated below and exceeded at least once, preferably several times, the temperature exceeding and falling below the eutectic point by at least 20 ° C., preferably at least 50 ° C.
  • the heating and cooling rates and the rate at which the temperature falls below and exceeds the eutectic melting point are preferably at a maximum of 10 ° C./min. However, cooling and / or heating speeds between 2 ° C./min and 5 ° C./min are preferred.
  • the atmospheric gas mixture set after reaching the sintering temperature can be selected from N 2 and CO with a ratio N 2 / (N 2 + CO) between 0.1 and 0.9.
  • the surface of the finished sintered body can be subjected to an etching treatment by means of gases or liquids, as a result of which the WC crystallites emerge more clearly through the formation of reliefs.
  • this measure can be used to remove binder metal components on the substrate body surface which are undesirable in a diamond coating.
  • FIG. 4 shows a scanning electron micrograph of the surface of the sintered body according to FIG. 2,
  • Fig. 8 is a temperature-time diagram in another
  • a WC-TiC-TiN-TaC-NbC-Co green compact with a composition with 1.3 mass% TiC was subjected to the temperature control shown in FIG. 1.
  • the green body was heated for about 3 hours in a vacuum atmosphere to a temperature of 1200 ° C, which was then maintained for about half an hour.
  • An inert gas was then admitted at a pressure of 5 ⁇ 10 3 Pa and the heating was continued at 1485 ° C. until the sintering point was reached.
  • the inert gas atmosphere was replaced by a nitrogen atmosphere under a pressure of 5 ⁇ 10 4 Pa.
  • the sintering temperature was maintained for about half an hour after which the furnace atmosphere was cooled to 1400 ° C.
  • the temperature of 1400 ° C was maintained for about 5 hours after which the sintered body was cooled to room temperature. After reaching the sintering temperature until reaching 1000 ° C in the cooling phase, the nitrogen atmosphere was maintained under the pressure mentioned.
  • FIG. 4 shows a scanning electron micrograph of the surface of the sintered body according to FIG. 2, which shows that the WC crystallites are firmly integrated into the surface edge zones from which they protrude by 2 ⁇ m to 20 ⁇ m.
  • the WC crystallites Share of face-centered cubic phase (Ti, Ta, Nb, W) (C, N) and binder phase.
  • face-centered cubic phase Ti, Ta, Nb, W
  • C, N binder phase
  • the proportion of tantalum and niobium carbides that can be estimated according to this is about 20 mol%.
  • An inhomogeneous and / or at least two-phase structure of the face-centered cubic phase can be derived from the peak shape of the diffraction lines, in a manner similar to that known for cermets with a core-shell structure.
  • FIG. 6 shows an edge zone structure of a sintered body of another mixture which has a (larger) proportion of TiC, namely 6% by mass.
  • This sintered body is treated in the same manner described above, larger proportions of face-centered cubic phase are formed between the WC crystallites protruding from the surface.
  • the WC crystallites are significantly larger than in the case of sintered bodies which have only a lower carbide content in the starting mixture.
  • FIG. 7 An edge zone structure of a further sintered sample is shown in FIG. 7.
  • the structure according to FIG. 7 was obtained when the body was treated in accordance with FIG. 8.
  • the body is cooled to 1200 ° C. and then reheated to 1400 ° C.
  • the temperature of 1400 ° C was maintained for about 2 1/2 hours before the body was cooled.
  • WC crystallites protrude from the surface edge zone, which in an intermediate layer with an enrichment of face-centered cubic phase of carbides, Nitrides and carbonitrides of titanium, tantalum, niobium or tungsten border.
  • This layer does not have to be strictly single-phase or homogeneous, but can consist of carbon-rich and low-carbon phases.
  • Certain proportions of binder material are also incorporated into the intermediate layer.
  • the sintered core joins the edge zone, which corresponds in its composition and its layer structure to the overall composition.
  • the described edge structure which differs in its structure from layers below, is formed in particular by heat treatments with changing temperatures, as can be seen, for example, from FIG. 8.
  • FIGS. 10 and 11 Variations in the temperature control are shown in FIGS. 10 and 11.
  • the heating speed to temperatures up to 1200 ° C. and up to 1485 ° C. (sintering temperature) is chosen to be greater, namely with 5 ° C./min in comparison to the lower heating speed in the temperature profile according to FIG. 8.
  • the cooling rate following the holding time to the sintering temperature was chosen to be 2 ° C./min.
  • Both the heating rate from 1200 ° C to 1400 ° C and the cooling rate selected after a holding time of approx. 2 1/2 hours is 5 ° C / min. 11, in comparison to FIG. 1, a higher heating rate of 5 ° C./min in the first two heating phases was also chosen instead of the significantly lower heating rate shown in FIG. 1.

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

Abstract

L'invention concerne un corps en métal dur ou en cermet comportant une phase substance dure constituée de WC et/ou d'au moins un carbure, nitrure, carbonitrure et/ou oxycarbonitrure d'au moins un des éléments des groupes IVa, Va ou VIa de la classification périodique des éléments, et une phase métal liant constituée de Fe, Co et/ou Ni, dont la proportion est de 3 à 25 % en masse. En particulier pour que l'adhérence des couches superficielles appliquées soit améliorée, il est proposé que des cristallites de WC dépassent de 2 à 20 mu m de la surface du corps de métal dur ou de cermet.
EP99941397A 1998-07-08 1999-06-26 Corps en metal dur ou en cermet, et son procede de production Revoked EP1095168B1 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
DE19830385 1998-07-08
DE19830385 1998-07-08
DE19845376A DE19845376C5 (de) 1998-07-08 1998-10-02 Hartmetall- oder Cermet-Körper
DE19845376 1998-10-02
DE1999122057 DE19922057B4 (de) 1999-05-14 1999-05-14 Hartmetall- oder Cermet-Körper und Verfahren zu seiner Herstellung
DE19922057 1999-05-14
PCT/DE1999/001875 WO2000003047A1 (fr) 1998-07-08 1999-06-26 Corps en metal dur ou en cermet, et son procede de production

Publications (2)

Publication Number Publication Date
EP1095168A1 true EP1095168A1 (fr) 2001-05-02
EP1095168B1 EP1095168B1 (fr) 2002-07-24

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EP99941397A Revoked EP1095168B1 (fr) 1998-07-08 1999-06-26 Corps en metal dur ou en cermet, et son procede de production

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US (1) US6506226B1 (fr)
EP (1) EP1095168B1 (fr)
AT (1) ATE221140T1 (fr)
WO (1) WO2000003047A1 (fr)

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US6506226B1 (en) 2003-01-14
ATE221140T1 (de) 2002-08-15
EP1095168B1 (fr) 2002-07-24

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