ZA200300825B - Method of producing an abrasive product containing cubic boron nitride. - Google Patents
Method of producing an abrasive product containing cubic boron nitride. Download PDFInfo
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- ZA200300825B ZA200300825B ZA200300825A ZA200300825A ZA200300825B ZA 200300825 B ZA200300825 B ZA 200300825B ZA 200300825 A ZA200300825 A ZA 200300825A ZA 200300825 A ZA200300825 A ZA 200300825A ZA 200300825 B ZA200300825 B ZA 200300825B
- Authority
- ZA
- South Africa
- Prior art keywords
- metal
- boron nitride
- alloy
- cubic boron
- mixture
- Prior art date
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- 229910052582 BN Inorganic materials 0.000 title claims description 50
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 title claims description 50
- 238000000034 method Methods 0.000 title claims description 27
- 229910052751 metal Inorganic materials 0.000 claims description 72
- 239000002184 metal Substances 0.000 claims description 72
- 239000002245 particle Substances 0.000 claims description 50
- 229910045601 alloy Inorganic materials 0.000 claims description 45
- 239000000956 alloy Substances 0.000 claims description 45
- 239000000203 mixture Substances 0.000 claims description 31
- 229910052723 transition metal Inorganic materials 0.000 claims description 16
- 150000003624 transition metals Chemical class 0.000 claims description 16
- 150000004767 nitrides Chemical class 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 230000001427 coherent effect Effects 0.000 claims description 8
- 239000002243 precursor Substances 0.000 claims description 8
- 229910017052 cobalt Inorganic materials 0.000 claims description 7
- 239000010941 cobalt Substances 0.000 claims description 7
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 239000004411 aluminium Substances 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- 239000010936 titanium Substances 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 claims description 3
- 229910003468 tantalcarbide Inorganic materials 0.000 claims description 3
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 claims description 3
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 claims description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 229910052684 Cerium Inorganic materials 0.000 claims description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 2
- 229910052776 Thorium Inorganic materials 0.000 claims description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 2
- 229910052788 barium Inorganic materials 0.000 claims description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052790 beryllium Inorganic materials 0.000 claims description 2
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000011651 chromium Substances 0.000 claims description 2
- 229910052735 hafnium Inorganic materials 0.000 claims description 2
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052746 lanthanum Inorganic materials 0.000 claims description 2
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 2
- 229910052744 lithium Inorganic materials 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 239000011733 molybdenum Substances 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- 239000010955 niobium Substances 0.000 claims description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 229910052712 strontium Inorganic materials 0.000 claims description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims description 2
- 229910052715 tantalum Inorganic materials 0.000 claims description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 2
- -1 ytrium Chemical compound 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims 1
- 239000000463 material Substances 0.000 description 15
- 238000005245 sintering Methods 0.000 description 9
- 150000001247 metal acetylides Chemical class 0.000 description 6
- 239000002775 capsule Substances 0.000 description 5
- 229910003460 diamond Inorganic materials 0.000 description 5
- 239000010432 diamond Substances 0.000 description 5
- 150000002739 metals Chemical class 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Description
METHOD OF PRODUCING AN ABRASIVE PRODUCT
CONTAINING CUBIC BORON NITRIDE
THIS invention relates to a method of producing an abrasive product containing cubic boron nitride and cemented carbide.
Cemented carbide is a material which is used extensively in industry for a variety of applications, both as an abrading material and as a wear resistant material. Cemented carbides generally consist of suitable carbide particles such as tungsten carbide, tantalum carbide or titanium carbide, bonded together by means of a bonding metal such as cobalt, iron or nickel, or an alloy thereof. Typically, the metal content of cemented carbides is about 3 to 35% by weight. They are produced by sintering the carbide particles and the bonding metal at temperatures of the order of 1400°C.
At the other end of the spectrum, ultrahard abrasive and wear resistant products are found. Diamond and cubic boron nitride compacts are
CONFIRMATION COPY
- polycrystalline masses of diamond or cubic boron nitride particles, the bonding being created under conditions of elevated temperature and pressure at which the ultrahard component, i.e the diamond or cubic boron nitride, is crystallographically stable. Polycrystalline diamond (PCD) and polycrystalline cubic boron nitride (PCBN) can be produced with or without a second phase or bonding matrix. The second phase, when provided, may be, in the case of diamond, a catalyst/solvent such as cobalt, or may be a carbide forming element such as silicon. Similar sintering mechanisms are utilised in PCBN synthesis with various carbides, nitrides and borides being common second phases.
PCD and PCBN have a far higher wear resistance than cemented carbides, but tend to be somewhat brittle. This brittleness can lead to edge chipping of the working surface which can present a problem in applications where fine finishes are required. Furthermore, ultrahard products such as PCD and
PCBN can generally not be directly brazed onto a metallic support. They are therefore often sintered in combination with a cemented carbide substrate.
The bi-layered nature of such ultrahard products can be problematic in terms of thermo-mechanical stresses between the two materials: differential expansion : and shrinkage on heating and cooling due to different thermal expansion coefficients and elastic moduli can lead to crack formation or unfavourable residual stresses if the substrate and the ultrahard products are too dissimilar.
Another potential problem of such bi-layered materials is that of undercutting, i.e preferential wear of the less abrasion resistant carbide support. Further, machining of ultrahard products is difficult and costly, where carbide products can be relatively easily ground to the final geometry.
Efforts have been made to solve some of these problems.
JP-A-57 116 742 discloses the preparation of a modified cemented carbide under hot pressing conditions, i.e temperatures of the order of 1400°C to
; N 1500°C with little or no pressure being applied. These are not conditions at which cubic boron nitride is crystallographically stable.
European Patent No 0 256 829 describes a method of producing an abrasive and wear resistant material comprising a mass of carbide particles, a mass of cubic boron nitride particles and a bonding metal or alloy bonded into a coherent, sintered form, the cubic boron nitride particle content of the material not exceeding 20% by weight and the material being substantially free of hexagonal boron nitride, which comprises contacting appropriate amounts of a mass of carbide particles and a mass of cubic boron nitride particles with a bonding metal or alloy and sintering the particles and metal or alloy under ’ temperature and pressure conditions at which the cubic boron nitride is crystallographically stable.
According to the invention there is provided a method of producing an abrasive product comprising: (1) providing a mixture of a mass of discrete carbide particles and a mass of cubic boron nitride particles, the cubic boron nitride particles being present in the mixture in an amount such that the cubic boron nitride content of the abrasive product is 25% or less by weight; and (2) subjecting the mixture to elevated temperature and pressure conditions at which the cubic boron nitride is crystallographically stable and at which substantially no hexagonal boron nitride is formed, in the presence of a bonding metal or alloy capable of bonding the mixture into a coherent, sintered product, wherein the bonding metal or alloy comprises a combination of: (a) a transition metal or a transition metal alloy, preferably cobalt, iron or nickel, or alloys thereof; and
(b) from greater than 0% up to 40% by volume of the bonding metal or alloy (i.e. metal (a) plus metai (b)) of a second metal which is a stronger nitride and/or boride former than the transition metal or the transition metal alloy, or an alloy of the second metal; to produce the abrasive product.
The metal (b) is preferably selected from the group consisting of aluminium, silicon, titanium, zirconium, molybdenum, niobium, tungsten, vanadium, hafnium, tantalum, chromium, magnesium, calcium, barium, ytrium, beryllium, cerium, strontium, thorium, lanthanum and lithium.
The preferred metal (b) is selected from the group consisting of silicon, aluminium and titanium.
Preferably, the bonding metal or alloy comprises from 60% to 99.5% by volume of the metal (a) and from 0.5% to 40% inclusive by volume of the metal (b).
The metal (a) is preferably provided in powdered form, but may also be added in the form of an organic precursor or salt precursor that is subsequently pyrolised to result in finely dispersed metal.
The metal (b) may be provided in powdered form but may also be added in the form of an organic precursor or salt precursor. Additionally, the metal (b) may be provided in the form of a non-stoichiometric carbide, nitride or boride or in the form of a stoichiometric carbide, nitride or boride where this is sufficiently soluble in the metal (a) such that metal (b) can migrate through metal (a).
The metals (a) and (b) may also be provided in the form of an alloy of the metals (a) and (b).
The bonding metal or alloy, e.g the metals (a) and (b) may be mixed with the carbide particles and with the cubic boron nitride particles and the mixture may then be sintered as such, or the mixture may first be cold-pressed to produce a weak but coherent body prior to sintering.
Alternatively, the bonding metal or alloy, e.g the metais (a) and (b) may be supplied in the form of a separate layer adjacent to the cubic boron nitride- carbide mixture and infiltrated during the high temperature/high pressure treatment step.
The cubic boron nitride particles are preferably present in the mixture in an amount such that the cubic boron nitride content of the abrasive product is from 10% to 18% inclusive by weight.
The cubic boron nitride particles may be fine or coarse. The cubic boron nitride particles preferably have a particle size in the range of from 0,2 um to 70 um inclusive, preferably less than 20 ym, more preferably less than 10 pm.
The bonding metal or alloy is preferably used in an amount of from 2% to 20% inclusive by weight of the abrasive product, more preferably from 5% to 20% inclusive by weight of the abrasive product, most preferably less than 15% by weight of the abrasive product.
The carbide particles may be any carbide particles used in the manufacture of conventional cemented carbides. Examples of suitable carbides are tungsten carbide, tantalum carbide, titanium carbide and mixtures of two or more thereof.
The carbide particles preferably have a particle size in the range of from 0,1 pum to 10 pm inclusive.
The sintering of the mixture of carbide and cubic boron nitride particles and the bonding metal or alloy preferably takes place at a temperature in the range of from 1200°C to 1600°C inclusive, and at a pressure from 30 to 70 kbar inclusive.
This step is preferably carried out under controlled non-oxidising conditions.
The sintering of the mixture of carbide and cubic boron nitride particles and the bonding metal or alloy may be carried out in a conventional high temperature/high pressure apparatus. The mixture may be loaded directly into the reaction capsule of such an apparatus. Aiternatively, the mixture may be placed on a cemented carbide support or a recess formed in a carbide support, and loaded in this form into the capsule.
In a preferred method of the invention, the carbide particles, the cubic boron nitride particles and the bonding metal or alloy have volatiles removed from them prior to sintering, e.g by heating them in a vacuum. These components are preferably then vacuum sealed by, for example, electron beam welding prior to sintering. The vacuum may, for example, be a vacuum of 1 mbar or less and the heating may be a temperature in the range of 500°C to 1200°C inclusive.
The abrasive product produced by the method of the invention may be used as an abrasive product for abrading materials, or as a wear resistant material, particularly in tool components or inserts which consist of an abrasive compact bonded to a cemented carbide support. Typical applications include the cutting of wood and construction materials as well as the machining of various metallic work pieces such as stainless steel, nodular cast irons and superalloys.
The crux of the invention is a method of producing an abrasive product by providing a mixture of a mass of discrete carbide particles and a mass of cubic boron nitride particles, and subjecting the mixture to elevated temperature and pressure conditions at which the cubic boron nitride is crystallographically stable and at which substantially no hexagonal boron nitride is formed, in the presence of a bonding metal or alloy capable of bonding the mixture into a coherent, sintered product. The cubic boron nitride particles are present in the mixture in an amount such that the cubic boron nitride content of the abrasive product is 25% or less by weight, preferably in the range of from 10% to 18% inclusive by weight.
The bonding metal or alloy comprises a combination of: (a) a transition metal or a transition metal alloy, preferably cobalt, iron or nickel, or alloys thereof; (b) from greater than 0% up to 40% by volume of the bonding metal or alloy of a second metal which is a stronger nitride or boride former than the transition metal or transition metal alloy, or an alloy of the second metal.
The abrasive product produced is, in effect, a cemented carbide which has been modified by the addition of cubic boron nitride particles. The addition of these particles provides the cemented carbide with greater abrasive and wear resistant properties.
The abrasive product produced must be substantially free of hexagonal boron nitride. The presence of any significant quantity of hexagonal boron nitride reduces the abrasive wear resistant properties of the product. In producing the product, it is important that conditions are chosen which achieve this.
The sintering step is carried out in the presence of a bonding metal or alloy which comprises a combination of (a) a transition metal or transition metal alloy and (b) from greater than 0% up to 40% by volume of the bonding metal or alloy of a second metal which is a stronger nitride or boride former than the transition metal or transition metal alloy, or an alloy of this second metal.
As the boride or nitride forming metals tend to react with the cubic boron nitride particles, high amounts of such metals can result in excessive loss of the cubic boron nitride phase and the formation of a high proportion of undesirable brittle phases. Thus, metal (b) is used in an amount up to 40% by volume of the bonding metal or alloy, i.e the total metal content, and this has been found sufficient to achieve a highly wear resistant product.
The presence of the metal (b) leads to improved bonding of the cubic boron nitride grains to the carbide matrix and thus to an improvement in the properties of the abrasive product produced.
The invention will now be described in more detail with reference to the following examples.
Example 1 (Comparative Example)
A powder mixture of 10,6 wt % cubic boron nitride, 79,6 wt % tungsten carbide and 9,8 wt % cobalt, all in the size range 1 to 2 micron, was thoroughly mixed in a planetary ball mill to achieve a homogeneous blend of the materials. The blend was uniaxially compacted to form a coherent pellet. The pellet was loaded into a metal canister and subsequently outgassed under vacuum at 1100°C and sealed by electron beam welding. The sealed containers were loaded into the reaction capsule of a standard high pressure/high temperature apparatus and the loaded capsules placed into the reaction centre of this apparatus. The contents of the capsule were exposed to a temperature of approximately 1450°C and a pressure of 50 kbar. These conditions were maintained for 10 minutes. After completion of the treatment a weli-sintered, hard and wear resistant material was recovered from the canister.
The abrasion resistance of the material was tested using a turning test where silica flour filled epoxy resin was machined using the following conditions:
Sample format: 90° quadrant 3,2 mm thick
Tool hoider: neutral
Rate angle: 0°
Clearance angle: 6°
Cutting speed: 10 m/min
Depth of cut: 1,0 mm
Feed rate: 0,3 mmirev
Test duration: 60s
Under the given conditions the material exhibited a maximum flank wear width of 0,17 mm.
Example 2
In order to assess the benefit of a nitride and boride forming additive the following mix was prepared using the method of Example 1: 10,6 wt % cubic boron nitride 79,6 wt % tungsten carbide 9,2 wt % cobalt 0,6 wt % aluminium
Using the same turning test as in Example 1 the material showed a maximum flank wear width of 0,14 mm.
Claims (18)
1 A method of producing an abrasive product comprising:
(1) providing a mixture of a mass of discrete carbide particles and a mass of cubic boron nitride particles, the cubic boron nitride particles being present in the mixture in an amount such that the cubic boron nitride content of the abrasive product is 25% or less by weight; and
(2) subjecting the mixture to elevated temperature and pressure conditions at which the cubic boron nitride is crystallographically stable and at which substantially no hexagonal boron nitride is formed, in the presence of a bonding metal or alloy capable of bonding the mixture into a coherent, sintered product, wherein the bonding metal or alloy comprises a combination of:
(a) a transition metal or a transition métal alloy; and
(b) from greater than 0% up to 40% by volume of the bonding metal or alloy of a second metal which is a stronger nitride or boride former than the transition metal or the transition metal alloy, or an alloy of the second metal;
to produce the abrasive product.
2 A method according to claim 1 wherein the transition metal is selected from the group consisting of cobalt, iron and nickel.
3 A method according to either of claims 1 or 2 wherein the second metal (b) is selected from the group consisting of aluminium, silicon, titanium, zirconium, molybdenum, niobium, tungsten, vanadium, hafnium, tantalum, chromium, magnesium, calcium, barium, ytrium, beryllium, cerium, strontium, thorium, lanthanum and lithium.
4 A method according to claim 3 wherein the second metal (b) is selected from the group consisting of silicon, aluminium and titanium.
A method according to any one of claims 1 to 4 wherein the bonding metal or alloy comprises from 60% to 99.5% inclusive by volume of the metal (a) and from 0.
5% to 40% inclusive by volume of the metal (b).
6 A method according to any one of claims 1 to 5 wherein the metal (a) is provided either in powdered form or in the form of an organic precursor or salt precursor that is subsequent pyrolised to result in finely dispersed metal.
7 A method according to any one of claims 1 to 6 wherein the metal (b) is provided either in powder form; or in the form of an organic precursor or salt precursor; or in the form of a non-stoichiometric carbide, nitride or boride; or in the form of a stoichiometric carbide, nitride or boride where this is sufficiently soluble in the metal (a).
8 A method according to any one of claims 1 to 5 wherein the metal (a) and the metal (b) are provided in the form of an alloy of the metal (a) with the metal (b).
9 A method according to any one of claims 1 to 8 wherein in step (1) the bonding metal or alloy is mixed with the carbide particles and with the cubic boron nitride particles, and in step (2) the mixture is subjected to the elevated temperature and pressure conditions.
A method according to any one of claims 1 to 8 wherein in step (1) the bonding metal or alloy is mixed with the carbide particles and with the cubic boron nitride particles, whereafter the mixture is cold-pressed to produce a weak coherent body, and in step (2) the weak coherent body is subjected to the elevated temperature and pressure conditions.
11 A method according to any one of claims 1 to 8 wherein in step (1) the bonding metal or alloy is supplied in the form of a separate layer adjacent to the mixture of the mass of carbide particles and the mass of cubic boron nitride particles, and in step (2) the bonding metal or alloy is infiltrated when the mixture is subjected to the elevated temperature and pressure conditions.
12 A method according to any one of claims 1 to 11 wherein the cubic boron nitride particles are present in the mixture in an amount such that the cubic boron nitride content of the abrasive product is from 10% to 18%
: inclusive by weight.
13 A method according to any one of claims 1 to 12 wherein the cubic boron nitride particles have a particle size in the range of from 0,2 pm to 70 pm inclusive.
14 A method according to any one of claims 1 to 13 wherein the bonding metal or alloy is used in an amount of from 2% to 20% inclusive by weight of the abrasive product.
A method according to any one of claims 1 to 14 wherein the carbide particles are selected from the group consisting of tungsten carbide particles, tantalum carbide particles, titanium carbide particles, and mixtures of two or more thereof.
16 A method according to any one of claims 1 to 15 wherein the carbide particles have a particle size in the range of from 0,1 um to 10 pm inclusive.
~ WO 02/12578 PCT/IB01/01385
17 A method according to any one of claims 1 to 16 wherein in step (2) the elevated temperature and pressure conditions are a temperature in the range of from 1200°C to 1600°C inclusive and a pressure of from 30 kbar to 70 kbar inclusive.
18 A method according to any one of claims 1 to 17 wherein step (2) is carried out under controlled non-oxidising conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA200300825A ZA200300825B (en) | 2000-08-08 | 2003-01-30 | Method of producing an abrasive product containing cubic boron nitride. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA200004045 | 2000-08-08 | ||
| ZA200300825A ZA200300825B (en) | 2000-08-08 | 2003-01-30 | Method of producing an abrasive product containing cubic boron nitride. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ZA200300825B true ZA200300825B (en) | 2004-02-24 |
Family
ID=32853698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ZA200300825A ZA200300825B (en) | 2000-08-08 | 2003-01-30 | Method of producing an abrasive product containing cubic boron nitride. |
Country Status (1)
| Country | Link |
|---|---|
| ZA (1) | ZA200300825B (en) |
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2003
- 2003-01-30 ZA ZA200300825A patent/ZA200300825B/en unknown
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