CN108342633B - Matrix composition, diamond segment adopting same and preparation method thereof - Google Patents
Matrix composition, diamond segment adopting same and preparation method thereof Download PDFInfo
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- CN108342633B CN108342633B CN201711397647.2A CN201711397647A CN108342633B CN 108342633 B CN108342633 B CN 108342633B CN 201711397647 A CN201711397647 A CN 201711397647A CN 108342633 B CN108342633 B CN 108342633B
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- 239000010432 diamond Substances 0.000 title claims abstract description 173
- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 170
- 239000011159 matrix material Substances 0.000 title claims abstract description 75
- 239000000203 mixture Substances 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 76
- 239000002994 raw material Substances 0.000 claims abstract description 33
- 229910052751 metal Inorganic materials 0.000 claims abstract description 30
- 239000002184 metal Substances 0.000 claims abstract description 30
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000005245 sintering Methods 0.000 claims abstract description 22
- 238000001513 hot isostatic pressing Methods 0.000 claims abstract description 20
- 239000000956 alloy Substances 0.000 claims abstract description 16
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 16
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims description 31
- 239000003292 glue Substances 0.000 claims description 29
- 238000002156 mixing Methods 0.000 claims description 23
- 230000007704 transition Effects 0.000 claims description 22
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 21
- 239000002923 metal particle Substances 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 13
- 238000005507 spraying Methods 0.000 claims description 13
- 239000003979 granulating agent Substances 0.000 claims description 11
- 238000000748 compression moulding Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910002804 graphite Inorganic materials 0.000 claims description 7
- 239000010439 graphite Substances 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 238000005488 sandblasting Methods 0.000 claims description 5
- 238000005469 granulation Methods 0.000 claims description 3
- 230000003179 granulation Effects 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
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- 238000005303 weighing Methods 0.000 claims description 2
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- 238000007731 hot pressing Methods 0.000 abstract description 9
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 6
- 238000004321 preservation Methods 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 5
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000011572 manganese Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000007873 sieving Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000000280 densification Methods 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
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- 238000004663 powder metallurgy Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000036346 tooth eruption Effects 0.000 description 2
- JFARSZKBZGPJGR-UHFFFAOYSA-N 2-(6-azaspiro[2.5]octan-6-yl)-N-[2-(4-fluoro-4-methylpiperidin-1-yl)-6-methylpyrimidin-4-yl]-4-(2-hydroxyethylsulfonylamino)benzamide Chemical compound FC1(CCN(CC1)C1=NC(=CC(=N1)NC(C1=C(C=C(C=C1)NS(=O)(=O)CCO)N1CCC2(CC2)CC1)=O)C)C JFARSZKBZGPJGR-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Images
Classifications
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- 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
-
- B22F1/0003—
-
- 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
- B22F1/17—Metallic particles coated with metal
-
- 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
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
-
- 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
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
- B22F3/15—Hot isostatic pressing
-
- 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
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
-
- 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
- C22C29/067—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 comprising a particular metallic binder
-
- 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
- B22F2998/10—Processes characterised by the sequence of their steps
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
- C22C2026/006—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes with additional metal compounds being carbides
Abstract
The invention relates to a carcass composition, which comprises the following components in percentage by weight: 60-80% of WC powder, 5-15% of Co powder, 5-12% of Cu powder, 3-5% of Mn powder, 2-6% of Zn powder and 3-8% of nickel-based self-fluxing alloy powder; the diamond segment comprises a working layer and is prepared from the following raw materials in percentage by volume: 50-70% of the matrix composition and 30-50% of diamond; also discloses a preparation method of the segment. The nickel-based self-fluxing alloy powder in the matrix composition can be well fused into other metal powder by combining with Mn powder and Zn powder; the diamond is put into the matrix by rounding, and is not easy to fall off; then sequentially carrying out vacuum hot-pressing sintering and hot isostatic pressing treatment; the section block has excellent impact toughness, wear resistance and diamond holding force, and the diamonds are uniformly distributed and stressed and can work in extremely severe drilling/boring environments.
Description
Technical Field
The invention relates to a matrix composition and a diamond segment adopting the composition, in particular to a diamond segment for geological, coal and oil drilling bits or building materials and stone drilling bits; also relates to a preparation method of the diamond segment.
Background
The diamond segment is a sintered body which is mainly made of tungsten carbide and cobalt and is wrapped with coarse-grain diamond, the matrix has strong wear resistance and impact resistance, the drilling and cutting capacity of the coarse-grain diamond is good, and the diamond segment is very suitable for drilling in stratums which are difficult to drill in severe environments. Ordinary diamond segment is formed through hot pressing sintering after matrix powder (generally be the carbide powder of high carbide content) and diamond misce bene, because diamond concentration is high, it is big with matrix powder specific gravity difference, consequently difficult obtain misce bene matrix powder, the crane span structure phenomenon appears between easy diamond of suppression and sintering process, lead to the diamond segment hardness and the weak area of intensity to appear in diamond crane span structure department, can lose efficacy in advance in the weak area in the use, thereby cause the short-lived problem. Moreover, because the diamond segment is subjected to huge pressure and impact force in the deep well, the segment is required to have extremely high impact toughness, and the diamond segment obtained by conventional powder metallurgy cannot meet the huge impact at all.
Disclosure of Invention
In view of the deficiencies of the prior art, it is an object of the present invention to provide a carcass composition.
The invention also aims to provide a diamond segment prepared by adopting the matrix composition and a preparation method thereof. In the diamond segment, the diamonds are uniformly distributed in the segment, have good wear resistance, hardness and impact toughness, and can be used for cutting teeth of drilling bits for geology, coal and petroleum, or cutting teeth of drilling bits for building materials and stone materials, and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
the tire body composition comprises the following components in percentage by weight: 60-80% of WC powder, 5-15% of Co powder, 5-12% of Cu powder, 3-5% of Mn powder, 2-6% of Zn powder and 3-8% of nickel-based self-fluxing alloy powder.
The reason for the selection of the above components is as follows:
the WC powder, which is a strong carbide-forming element, is the most major wear-resistant component of the carcass. The content of WC in the matrix composition provided by the invention is controlled to be 60-80 wt%, if the addition amount exceeds the proportion, the sintering temperature is too high or the sintering compactness of the matrix is not high, and if the addition amount is lower than the proportion, the wear resistance of the matrix is not enough, and the diamond falls off prematurely.
The Co powder can effectively reduce the internal interfacial tension of cobalt and diamond, plays a key role in improving the holding force of the diamond, and can improve the bending strength of the tire body. The content of Co in the carcass composition provided by the invention is controlled to be 5-15 wt%.
The Cu powder and the Zn powder are mutually fused and are main binders of the matrix. The Cu content in the matrix composition provided by the invention is controlled to be 5-12 wt%.
The Mn powder has certain deoxidizing capacity to the metal powder, participates in the alloying of the matrix and strengthens the matrix. The Mn content of the matrix composition provided by the invention is controlled to be 3-5 wt%.
Zn powder and Cu powder are mutually fused and are main binders of the matrix, and the sintering temperature of the matrix can be reduced. The Zn content in the carcass composition provided by the invention is controlled to be 2-6 wt%.
The nickel-based self-fluxing alloy powder plays a key role in improving the holding force of the diamond. The content of the nickel-based self-fluxing alloy powder in the matrix composition provided by the invention is controlled to be 3-8 wt%.
A diamond segment comprising a working layer; the working layer is prepared from the following raw materials in percentage by volume: the matrix composition is 50-70% and the diamond is 30-50%. In the working layer, the diamond concentration was 120-200% calculated as 400% concentration, with 1/4 being the true concentration of diamond relative to all materials in the working layer feedstock, in other words 1/4 being the true concentration of diamond relative to the total addition of the matrix composition and diamond, i.e., 30-50% by volume as described above. The 400% concentration is 17.56 carats of diamondoid per cubic centimeter of the nodal working layer, while the 100% concentration represents 4.39 carats of diamondoid per cubic centimeter of the nodal working layer, so the 120% -200% concentration represents 5.268-8.78 carats of diamondoid per cubic centimeter of the nodal working layer. In the working layer, if the volume percentage of the diamond is lower than 30%, the wear resistance of the segment is insufficient, and if the volume percentage of the diamond exceeds 50%, the strength of the segment is insufficient due to excessive diamond; preferably, the concentration is controlled to be 35-47.5%.
In the diamond segment described above, as a preferred embodiment, the diamond segment further comprises a transition layer made of the matrix composition. The welding strength of the diamond segment can be improved by additionally arranging the transition layer.
In the diamond segment, as a preferred embodiment, the thickness of the transition layer is 1/4-1/6 of the thickness of the working layer, and the diamond segment with the thickness ratio has longer service life.
In the diamond segment, the diamond has a grain size of-18 to +25 meshes (i.e. the diamond can pass through an 18-mesh screen and can not pass through a 25-mesh screen, i.e. the diamond has a size of between about 710 and 1000 microns); preferably, the diamond has a particle size of-18 to +20 mesh (i.e., capable of passing through an 18 mesh screen but not passing through a 20 mesh screen, i.e., diamond having a size between about 850 and 1000 microns), or-20 to +25 mesh (i.e., capable of passing through a 20 mesh screen but not passing through a 25 mesh screen, i.e., diamond having a size between about 710 and 850 microns), or a mixed particle size of-18 to +20 mesh (also referred to as 18/20 mesh) and-20 to +25 mesh (also referred to as 20/25 mesh) (i.e., the diamond is a mixture of-18 to +20 mesh diamond and-20 to +25 mesh diamond). In the diamond segment, as a preferred embodiment, the shape of the diamond segment may be designed arbitrarily according to needs, and is preferably a symmetrical wedge (see fig. 1), a flat round head (see fig. 2), a cylindrical asymmetric wedge (see fig. 3), a racetrack shape (see fig. 4), or the like.
A preparation method of a diamond segment comprises the following steps:
step one, a carcass composition mixing step: weighing the raw materials according to the proportion of the matrix composition, and uniformly mixing to obtain matrix powder;
step two, preparing raw materials of a working layer: spraying glue on the diamond, and then rounding the matrix powder on the surface of the diamond according to the raw material proportion of the working layer to form a metal ball with the center being the diamond and the outer layer being the matrix powder (see figure 5); namely, each metal ball contains one diamond; all the matrix powder required in the working layer is wrapped on the surface of each diamond to form metal balls with uniform granularity, so that the diamonds in the working layer can be uniformly distributed in the matrix;
step three, compression molding treatment: paving the metal balls prepared in the step two into a mold, and performing compression molding treatment to obtain a molded blank;
step four, degumming treatment: degumming the formed blank obtained in the step three;
step five, vacuum sintering treatment: assembling the blank obtained in the step four into a graphite mold, and performing vacuum sintering treatment to obtain a sintered blank;
step six, hot isostatic pressing treatment: and D, wrapping the sintered blank obtained in the fifth step, and then performing hot isostatic pressing treatment to obtain the diamond segment.
The technical idea of the invention is as follows: the diamond particles are uniformly distributed in the matrix material by introducing a glue-rolling process, namely, each diamond is coated with a layer of matrix powder with a certain thickness on the surface according to the designed concentration through special treatment and then sintered into diamond segments. Because the diamond segment is subjected to huge pressure and impact force in a deep well, the segment is required to have extremely high impact toughness, and the diamond segment obtained by conventional powder metallurgy cannot meet the huge impact at all, a hot isostatic pressing process is further adopted in the preparation process of the diamond segment, and under the combined action of high temperature and high pressure, the segment is subjected to balanced pressure in all directions, so that the diamond segment is high in density, good in uniformity, excellent in performance and greatly improved in impact resistance. During rounding, the amount of the matrix composition required for rounding is determined according to the proportion of diamond and the matrix composition in the working layer, namely the concentration of diamond of 120-.
In the above method for manufacturing a diamond segment, as a preferred embodiment, before the third step, the method further includes: preparing a transition layer raw material: taking a proper amount of the matrix powder prepared in the step one, adding glue, uniformly stirring, and performing granulation treatment to obtain metal particles; in the third step, firstly, the metal balls prepared in the second step are paved in a mould, then the metal particles prepared in the transition layer raw material preparation step are paved on the metal balls in the mould, and then the compression molding treatment is carried out to obtain a molding blank.
In the above method for preparing a diamond segment, as a preferred embodiment, after the sixth step, a post-treatment step is further included, in which burrs are polished and sand blasting is performed on the diamond segment, so as to obtain a finished diamond segment product.
In the above method for preparing a diamond segment, as a preferred embodiment, in the step one, the mixing treatment time is 16-24h (e.g. 16.5h, 17h, 18h, 19h, 20h, 21h, 22h, 23h, 23.5h), and during the mixing treatment, 2-5% (e.g. 2.5%, 3%, 3.5%, 4%, 4.5%) of alcohol by weight of the matrix composition is added for wetting the metal powder, so that the mixing between the powders is more uniform.
In the preparation method of the diamond segment, the glue spraying treatment in the step two is to spray glue on the surface of the diamond, the glue is used for enabling the surface of the diamond to stick to the matrix powder to form a round or nearly round metal ball, the glue used in the preparation step of the transition layer raw material is used for granulating the transition layer metal powder, the glue used in the preparation method can be purchased from the market or prepared by a common method, as a preferred embodiment, the glue is prepared by mixing, stirring and heating granulating agents, ethylene glycol and isopropanol, wherein the granulating agents are preferably GB600 granulating agents, and the weight ratio of the granulating agents, the ethylene glycol and the isopropanol is 3:5: 2; the stirring speed is preferably 580-620rpm, and the heating temperature is preferably 60-80 ℃.
In the above method for manufacturing a diamond segment, as a preferred embodiment, in the second step, the amount of the spraying glue treatment is 1-3% (e.g. 1.2%, 1.5%, 1.8%, 2.2%, 2.5%, 2.8%) of the weight of the matrix composition.
In the above method for manufacturing a diamond segment, as a preferred embodiment, the amount of the glue added in the step of manufacturing the transition layer raw material is 2 to 5% (e.g., 2.5%, 3%, 3.5%, 4%, 4.5%) by weight of the matrix composition; more preferably, the particle size of the agglomerated metal powder after granulation, i.e. the particle size of the metal particles, is-20 mesh.
In the above method for preparing diamond segments, as a preferred embodiment, in step three, the pressure of the press forming process is 150-.
In the above method for preparing a diamond segment, as a preferred embodiment, in step four, the temperature of the degumming treatment is 500-.
In the method for preparing the diamond segment, as a preferred embodiment, in the fifth step, the temperature of the vacuum sintering treatment is 980--1Pa or less.
In the method for preparing the diamond segment, as a preferred embodiment, in the sixth step, the hot isostatic pressing treatment temperature is 880-.
The steps and the process conditions can be combined and used on the premise of not conflicting with each other.
Compared with the prior art, the invention has the beneficial effects that:
1) the nickel-based self-fluxing alloy powder, the Mn powder and the Zn powder can be well fused into other metal powder such as tungsten carbide, copper powder and cobalt powder, so that the tire body has good strength and impact toughness.
2) Because the diamond is put into the matrix through rounding, the diamond particles are not in direct contact, the matrix has high holding force on the diamond, and the diamond is not easy to fall off, so the diamond segment block has good wear resistance.
3) After the diamond segment is subjected to vacuum hot-pressing sintering, the matrix is relatively compact, and the densification degree can reach more than 97%; and the densification degree of the matrix is further improved to more than 99 percent through hot isostatic pressing treatment, so that the impact toughness and the wear resistance of the matrix are greatly improved.
4) The diamond segment of the invention has excellent impact toughness, wear resistance and diamond holding force, and the diamond is uniformly distributed and stressed, and can work in extremely severe drilling/boring environment.
Drawings
FIG. 1 is a schematic diagram of a symmetrical wedge diamond segment configuration provided in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic view of an oblate rounded diamond segment configuration provided in accordance with a preferred embodiment of the present invention;
FIG. 3 is a schematic structural view of a cylindrical asymmetric wedge-shaped diamond segment according to a preferred embodiment of the present invention;
FIG. 4 is a schematic view of a racetrack-shaped diamond segment configuration provided by a preferred embodiment of the invention;
FIG. 5 is a schematic illustration of a photograph of a metal ball formed after diamond rounding;
fig. 6 is a photograph showing the distribution of diamond in the diamond segment provided by the present invention.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, and the scope of the present invention includes, but is not limited to, the following examples.
The specific experimental procedures or conditions not specified in the examples can be carried out according to the procedures or conditions of the conventional procedures described in the literature in the field. The rounding equipment used in the embodiment is a sieving machine, namely, the diamond is vibrated on the equipment, rolled, dried and sieved to form a ball; in the embodiment, the glue spraying treatment is carried out by adopting a glue spraying machine; the reagents and raw materials used in the examples are all commercial products, the nickel-based self-fluxing alloy powder is BNi71CrSi, and the alloy powder is prepared according to the following weight percentages of GB 10859-89, AWS: BNi5, brand No.: Titd-Ni 06).
Example 1
1) The components and proportions of the carcass composition used in this example were as follows: the alloy comprises, by weight, 60 parts of tungsten carbide powder, 15 parts of cobalt powder, 12 parts of copper powder, 5 parts of manganese powder, 4 parts of zinc powder and 4 parts of nickel-based self-fluxing alloy powder. Taking the raw materials according to the proportion and mixing the raw materials; adding 3% alcohol based on the weight of the matrix composition during mixing, and mixing for 20 h; a matrix powder was obtained.
2) Preparing a working layer raw material: firstly, spraying glue on the diamond, wherein the glue spraying amount is 2% of the weight of the matrix composition, and the glue is prepared by mixing, stirring and heating GB600 granulating agents, ethylene glycol and isopropanol according to the weight ratio of 3:5:2, the stirring speed is 600rpm, and the heating temperature is 70 ℃; then, according to the proportion of various raw materials in the working layer, rounding all the matrix powder on the surface of the diamond to form metal balls (see figure 5) with the centers of the diamond and the outer layers of the matrix powder, wherein each metal ball contains one diamond; the diamond concentration was 130% (actually 32.5% diamond, 67.5% matrix composition) calculated as 400% concentration, with a diamond grit of 18/20 mesh;
3) preparing a transition layer raw material: firstly, taking a proper amount of the matrix powder prepared in the step 1), adding 3% of glue, uniformly stirring, then granulating, and sieving by using a 20-mesh sieve to form metal particles with the particle size of-20 meshes;
4) putting the metal balls prepared in the step 2) into a steel die, putting the metal particles prepared in the step 3) into the steel die, paving the metal particles on the metal balls, and performing compression molding treatment under the pressure of 150MPa for 8s to obtain a molded blank;
5) placing the formed blank obtained in the step 4) into a reducing furnace for degumming treatment at the temperature of 550 ℃ for 60 min;
6) assembling the formed blank obtained in the step 5) into a graphite mold, and putting the graphite mold into a vacuum hot-pressing sintering furnace for vacuum hot-pressing sintering treatment, wherein the temperature is 980 ℃, the pressure is 40MPa, the heat preservation time is 6min, and the vacuum degree is 1 multiplied by 10-1Pa, obtaining a sintered blank;
7) placing the sintered blank obtained in the step 6) into a steel sheath, and placing the steel sheath into a hot isostatic pressing treatment furnace for hot isostatic pressing treatment, wherein the hot isostatic pressing treatment temperature is 880 ℃, the pressure is 150MPa, and the heat preservation and pressure maintaining time is 60min, so as to obtain a diamond segment;
8) and 7) carrying out burr polishing and sand blasting treatment on the diamond segment obtained in the step 7) to obtain a finished diamond segment product. Fig. 6 is a plan view of the diamond segment prepared in this example, from which it can be seen that the diamond is uniformly distributed within the segment. The diamond segment prepared by the embodiment is a cylinder with the height of 15mm, wherein the transition layer and the working layer are vertically distributed, the thickness of the transition layer is 1/4 of the thickness of the working layer, specifically, the upper part is the working layer with the thickness of 12mm, and the lower part is the transition layer with the thickness of 3 mm; the service life of the diamond segment is tested by a method for testing the abrasion ratio, wherein the abrasion ratio refers to the ratio of the abrasion weight of the segment to the abrasion weight of the segment by grinding the segment and a 80-mesh silicon carbide grinding wheel, the specific test method is shown in JB/T3235-1999, and the service life (abrasion ratio) of the diamond segment prepared by the test embodiment is 10 ten thousand; other performance test results are shown in table 3.
Example 2
1) The components and proportions of the carcass composition used in this example were as follows: the alloy comprises, by weight, 70 parts of tungsten carbide powder, 10 parts of cobalt powder, 5 parts of copper powder, 5 parts of manganese powder, 5 parts of zinc powder and 5 parts of nickel-based self-fluxing alloy powder. Taking the raw materials according to the proportion and mixing the raw materials; adding 3% alcohol based on the weight of the matrix composition during mixing, and mixing for 20 h; a matrix powder was obtained.
2) Preparing a working layer raw material: firstly, spraying glue on the diamond, wherein the glue spraying amount is 2% of the weight of the matrix composition, the glue is prepared by mixing, stirring and heating GB600 granulating agents, ethylene glycol and isopropanol according to the weight ratio of 3:5:2, the stirring speed is 600rpm, and the heating temperature is 70 ℃; then, according to the proportion of various raw materials in the working layer, rounding all the matrix powder on the surface of the diamond to form metal balls (see figure 5) with the centers of the diamond and the outer layers of the matrix powder, wherein each metal ball contains one diamond; the diamond concentration was 150% (actually 37.5% diamond, 62.5% matrix composition), calculated as 400% concentration, diamond 18/20 mesh and 20/25 mesh mixed in a 1:1 weight ratio;
3) preparing a transition layer raw material: firstly, taking a proper amount of the matrix powder prepared in the step 1), adding 3% of glue, uniformly stirring, then granulating, and sieving by using a 20-mesh sieve to form metal particles with the particle size of-20 meshes;
4) putting the metal balls prepared in the step 2) into a steel die, putting the metal particles prepared in the step 3) into the steel die, paving the metal particles on the metal balls, and performing compression molding treatment under the pressure of 150MPa for 8s to obtain a molded blank;
5) placing the formed blank obtained in the step 4) into a reducing furnace for degumming treatment at the temperature of 550 ℃ for 60 min;
6) assembling the formed blank obtained in the step 5) into a graphite mold, and putting the graphite mold into a vacuum hot-pressing sintering furnace for vacuum hot-pressing sintering treatment, wherein the temperature is 1050 ℃, the pressure is 40MPa, the heat preservation time is 6min, and the vacuum degree is 1 multiplied by 10-1Pa, obtaining a sintered blank;
7) placing the sintered blank obtained in the step 6) into a steel sheath, and placing the steel sheath into a hot isostatic pressing treatment furnace for hot isostatic pressing treatment, wherein the hot isostatic pressing treatment temperature is 950 ℃, the pressure is 150MPa, and the heat and pressure preservation time is 60min to obtain a diamond segment;
8) and 7) carrying out burr polishing and sand blasting treatment on the diamond segment obtained in the step 7) to obtain a finished diamond segment product. The diamond segment of this example was formed in the same shape and height as in example 1, wherein the transition layer had a thickness of 1/5 mm, which was the thickness of the working layer, and the diamond segment of this example had a life span (wear ratio) of 12 ten thousand as measured by the same method as in example 1, and the results of the other property measurements are shown in Table 3.
Example 3
1) The components and proportions of the carcass composition used in this example were as follows: the alloy comprises, by weight, 80 parts of tungsten carbide powder, 5 parts of cobalt powder, 6 parts of copper powder, 4 parts of manganese powder, 2 parts of zinc powder and 3 parts of nickel-based self-fluxing alloy powder. Taking the raw materials according to the proportion and mixing the raw materials; adding 3% alcohol based on the weight of the matrix composition during mixing, and mixing for 20 h; a matrix powder was obtained.
2) Preparing a working layer raw material: firstly, spraying glue on the diamond, wherein the glue spraying amount is 2% of the weight of the matrix composition, the glue is prepared by mixing, stirring and heating GB600 granulating agents, ethylene glycol and isopropanol according to the weight ratio of 3:5:2, the stirring speed is 600rpm, and the heating temperature is 70 ℃; then, according to the proportion of various raw materials in the working layer, rounding all the matrix powder on the surface of the diamond to form metal balls (see figure 5) with the centers of the diamond and the outer layers of the matrix powder, wherein each metal ball contains one diamond; the diamond concentration is 190% (actually 47.5% diamond and 52.5% matrix composition) calculated according to the concentration of 400%, and the diamond particle size is 18/20 meshes;
3) preparing a transition layer raw material: firstly, taking a proper amount of the matrix powder prepared in the step 1), adding 3% of glue, and uniformly stirring; then, granulating, and sieving with a 20-mesh sieve to form metal particles with the particle size of-20 meshes;
4) putting the metal balls prepared in the step 2) into a steel die, putting the metal particles prepared in the step 3) into the steel die, paving the metal particles on the metal balls, and performing compression molding treatment under the pressure of 150MPa for 8s to obtain a molded blank;
5) placing the formed blank obtained in the step 4) into a reducing furnace for degumming treatment at the temperature of 550 ℃ for 60 min;
6) assembling the formed blank obtained in the step 5) into a graphite mold, and putting the formed blank into a vacuum hot-pressing sintering furnace for vacuum hot-pressing sintering treatment, wherein the temperature is 1100 ℃, the pressure is 40MPa, the heat preservation time is 6min, and the vacuum degree is 1 multiplied by 10-1Pa, obtaining a sintered blank;
7) placing the sintered blank obtained in the step 6) into a steel sheath, and placing the steel sheath into a hot isostatic pressing treatment furnace for hot isostatic pressing treatment, wherein the hot isostatic pressing treatment temperature is 1000 ℃, the pressure is 150MPa, and the heat preservation and pressure maintaining time is 60min, so as to obtain a diamond segment;
8) and 7) carrying out burr polishing and sand blasting treatment on the diamond segment obtained in the step 7) to obtain a finished diamond segment product. The diamond segment of this example was formed in the same shape and height as in example 1, wherein the transition layer had a thickness of 1/6 mm, which is the thickness of the working layer, and the diamond segment of this example had a life span (wear ratio) of 15 ten thousand as measured by the same method as in example 1, and the results of the other property measurements are shown in Table 3.
Examples 4 to 5
The procedure and parameters were the same as in example 1, except that the parameters of the hot isostatic pressing step were different from those of example 1. The hot isostatic pressing parameters for examples 4-5 are given in table 1 below.
TABLE 1 EXAMPLES 4-5 HIP parameters
Examples 6 to 9
The operation steps and parameters were the same as those of example 1 except that the parameters of the vacuum sintering treatment step were different from those of example 1. The vacuum sintering process parameters for examples 6-9 are shown in Table 2 below.
TABLE 2 vacuum sintering processing parameters for examples 6-9
Examples 10 to 13 and comparative example 1
Examples 10-13 the diamond segment was prepared according to the same method as in example 1, except that the formulation of the matrix composition was different from that of example 1. The formulation of the carcass compositions used in examples 10-13 is given in table 3 below.
TABLE 2 compositions and proportions (wt%) of the carcass compositions of examples 10-13
Test examples
The diamond segments prepared in the above examples and comparative examples were tested according to the present invention and the results are shown in table 3. The hardness HRC is measured by a Rockwell hardness tester; the bending strength is tested by adopting a three-point bending test method on a universal material testing machine; testing the density by adopting a drainage method; the impact work is tested by a pendulum impact tester.
Table 3 diamond segment performance test results of the examples
| Numbering | Hardness HRC | Flexural strength/MPa | Degree of densification/% | Impact work/J |
| Example 1 | 50 | 1015 | 99.5 | 452 |
| Example 2 | 56 | 985 | 99.1 | 428 |
| Example 3 | 58 | 962 | 99 | 410 |
| Example 4 | 48 | 930 | 98.7 | 401 |
| Example 5 | 51 | 928 | 99.0 | 392 |
| Example 6 | 45 | 880 | 98.2 | 368 |
| Example 7 | 52 | 935 | 98.6 | 421 |
| Example 8 | 53 | 910 | 99.2 | 415 |
| Example 9 | 55 | 872 | 98.9 | 388 |
| Example 10 | 47 | 941 | 99.2 | 416 |
| Example 11 | 52 | 918 | 98.9 | 405 |
| Example 12 | 56 | 985 | 99.1 | 428 |
| Example 13 | 58 | 962 | 99.0 | 410 |
| Comparative example 1 | 46 | 815 | 98.4 | 352 |
From the above embodiments, the diamond segment provided by the invention has excellent impact toughness, wear resistance and diamond holding force, and the diamond is uniformly distributed and stressed, so that the diamond segment can work in extremely severe drilling/drilling environments.
Claims (12)
1. A tyre body composition is characterized by comprising the following components in percentage by weight: 60-80% of WC powder, 5-15% of Co powder, 5-12% of Cu powder, 3-5% of Mn powder, 2-6% of Zn powder and 3-5% of nickel-based self-fluxing alloy powder;
the nickel-based self-fluxing alloy powder is BNi71CrSi, and is prepared according to the following formula of GB 10859-89, AWS: BNi5, brand No.: Titd-Ni 06.
2. A diamond segment, wherein the diamond segment comprises a working layer; the working layer is prepared from the following raw materials in percentage by volume: the carcass composition of claim 1, 50-70%, diamond 30-50%;
the diamond segment further comprises a transition layer made from the carcass composition, the transition layer having a thickness 1/4-1/6 of the working layer thickness.
3. A diamond segment according to claim 2 wherein the volume percentage of diamond is 35-47.5%.
4. A diamond segment according to any one of claims 2 or 3 wherein the diamond has a particle size of-18 to +25 mesh.
5. The diamond segment of claim 4 wherein the diamond has a particle size of-18 to +20 mesh, or-20 to +25 mesh, or a mixture of-18 to +20 mesh and-20 to +25 mesh.
6. The diamond segment of claim 4 wherein the diamond segment is shaped as a symmetrical wedge, an oblate button, a cylindrical asymmetric wedge, or a racetrack.
7. A preparation method of a diamond segment is characterized by comprising the following steps:
step one, a carcass composition mixing step: weighing the raw materials according to the proportion of the matrix composition as defined in claim 1, and uniformly mixing to obtain matrix powder;
step two, preparing raw materials of a working layer: spraying glue on the diamond, and then rounding the matrix powder on the surface of the diamond according to the raw material proportion of the working layer in any one of claims 2-6 to form a metal ball with the center being diamond and the outer layer being matrix powder;
step three, compression molding treatment: paving the metal balls prepared in the step two into a mold, and performing compression molding treatment to obtain a molding blank;
step four, degumming treatment: degumming the formed blank obtained in the step three;
step five, vacuum sintering treatment: assembling the blank obtained in the step four into a graphite mold, and performing vacuum sintering treatment to obtain a sintered blank;
step six, hot isostatic pressing treatment: wrapping the sintered blank obtained in the fifth step, and then performing hot isostatic pressing treatment to obtain the diamond segment;
before the third step, the method further comprises the following steps: preparing a transition layer raw material: taking a proper amount of the matrix powder prepared in the step one, adding glue, uniformly stirring, and performing granulation treatment to obtain metal particles; in the third step, firstly, the metal balls prepared in the second step are paved in a mould, then the metal particles prepared in the transition layer raw material preparation step are paved on the metal balls in the mould, and then compression molding treatment is carried out to obtain a molding blank;
in the third step, the pressure of the compression molding treatment is 150-200MPa, and the pressure maintaining time is 5-10 s;
in the fourth step, the temperature of the degumming treatment is 500-550 ℃, and the time is 50-70 min;
in the fifth step, the temperature of the vacuum sintering treatment is 980--1Pa below;
in the sixth step, the temperature of the hot isostatic pressing treatment is 880-.
8. The method for preparing the diamond segment according to claim 7, wherein after the sixth step, the method further comprises a post-treatment step of performing burr grinding and sand blasting on the diamond segment to obtain a finished diamond segment product.
9. The method of producing a diamond segment according to any of claims 7 or 8 wherein in step one, the mixing is carried out for a period of 16 to 24 hours, and during the mixing, an alcohol is added in an amount of 2 to 5% by weight of the matrix composition.
10. The method for preparing a diamond segment according to any one of claims 7 or 8, wherein in the second step, the amount of the sprayed glue of the spraying treatment is 1-3% of the weight of the matrix composition.
11. The method for preparing a diamond segment according to any one of claims 7 or 8, wherein in the step of preparing the raw material of the transition layer, the addition amount of the glue is 2-5% of the weight of the matrix composition; the particle size of the metal particles is-20 meshes.
12. The method for preparing the diamond segment according to any one of claims 7 or 8, wherein in the step two and in the step of preparing the transition layer raw material, the glue is prepared by mixing, stirring and heating granulating agents, ethylene glycol and isopropanol, wherein the granulating agents are GB600 granulating agents, and the weight ratio of the granulating agents to the ethylene glycol and the isopropanol is 3:5: 2; the stirring speed is 580-620rpm, and the heating temperature is 60-80 ℃.
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