CN113084173B - Polycrystalline diamond compact and synthesis method thereof - Google Patents
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- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 116
- 239000010432 diamond Substances 0.000 title claims abstract description 116
- 238000001308 synthesis method Methods 0.000 title claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 42
- 239000000956 alloy Substances 0.000 claims abstract description 42
- 229910052751 metal Inorganic materials 0.000 claims abstract description 32
- 239000002184 metal Substances 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 27
- 239000003054 catalyst Substances 0.000 claims abstract description 17
- 239000002245 particle Substances 0.000 claims abstract description 17
- 238000005245 sintering Methods 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 238000003466 welding Methods 0.000 claims abstract description 13
- 239000011248 coating agent Substances 0.000 claims abstract description 10
- 238000000576 coating method Methods 0.000 claims abstract description 10
- 230000002194 synthesizing effect Effects 0.000 claims abstract description 8
- 238000002791 soaking Methods 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 229910017052 cobalt Inorganic materials 0.000 claims description 40
- 239000010941 cobalt Substances 0.000 claims description 40
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 40
- 238000002156 mixing Methods 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- 238000005234 chemical deposition Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 150000002736 metal compounds Chemical class 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 claims description 3
- 238000010892 electric spark Methods 0.000 claims description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 2
- 229910017604 nitric acid Inorganic materials 0.000 claims description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 2
- 239000010410 layer Substances 0.000 abstract 5
- 230000003628 erosive effect Effects 0.000 abstract 1
- 239000003209 petroleum derivative Substances 0.000 abstract 1
- 239000002344 surface layer Substances 0.000 abstract 1
- 239000011159 matrix material Substances 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000005553 drilling Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- QZPSXPBJTPJTSZ-UHFFFAOYSA-N aqua regia Chemical compound Cl.O[N+]([O-])=O QZPSXPBJTPJTSZ-UHFFFAOYSA-N 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- HZEWFHLRYVTOIW-UHFFFAOYSA-N [Ti].[Ni] Chemical group [Ti].[Ni] HZEWFHLRYVTOIW-UHFFFAOYSA-N 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- 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
-
- 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
- B22F3/24—After-treatment of workpieces or articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- 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
- B22F7/06—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 workpieces or articles from parts, e.g. to form tipped tools
- B22F7/08—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 workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- 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
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/241—Chemical after-treatment on the surface
- B22F2003/242—Coating
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- 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
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/241—Chemical after-treatment on the surface
- B22F2003/244—Leaching
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
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Abstract
The invention discloses a method for synthesizing a polycrystalline diamond compact, which comprises the steps of directly sintering or coating a large amount of mixture of diamond particles and a metal catalyst around a hard alloy core, sintering at 5-8.5 GPa and 1400-1700 ℃, forming by laser or mechanical processing, soaking in a decobalting mixture for 5-30 days to remove all or most of the metal catalyst in the clearance of the polycrystalline diamond, wherein the surface layer of the polycrystalline diamond compact is provided with a decobalting layer with the depth of 1.1-2 mm, the decobalting layer is externally provided with a welding agent affinity layer with the thickness of 5-100 um, the welding agent affinity layer is a metal layer and comprises one or more of Ti, ni, co, ag and Mn, and the diamond compact synthesized by the method has excellent wear resistance, high temperature resistance and erosion resistance in the exploitation of petroleum gas and shale gas.
Description
Technical Field
The invention belongs to the technical field of diamond compacts, and particularly relates to a polycrystalline diamond compact and a synthesis method thereof.
Background
Polycrystalline diamond compacts (or PDCs) are composite superhard materials with very excellent properties, which are formed by sintering micron-sized diamond particles and a sintering catalyst on a cemented carbide substrate under high-temperature and high-pressure conditions. The polycrystalline diamond not only keeps the high hardness, high heat resistance and corrosion resistance of diamond particles, but also has weldability similar to that of alloy, and has wide application in the fields of hard material processing, geological drilling, mineral exploitation, shield construction, oil and gas exploration and exploitation and the like.
The sintering aid plays an important role in promoting the production of the PDC, but it is also an important factor causing the PDC to fail during use. The common sintering aid for polycrystalline diamond compacts is cobalt, and metallic iron, nickel, alloys thereof, and the like may also be used. In the high-temperature high-pressure sintering process, the metal sintering aid promotes a large amount of diamond grains to directly form bonds (D-D bonds), so that the polycrystalline diamond compact has high strength and wear resistance. The polycrystalline diamond compact mostly works under the conditions of high temperature and high stress, and because the difference between the thermal expansion coefficients of the metal sintering aid and diamond is large, diamond grains in a diamond layer are easy to fall off in the working process, so that the service performance of the polycrystalline diamond compact can be reduced. In addition, when the temperature is higher than 700 ℃, the sintering aid metal cobalt, iron and the like can catalyze the diamond to reversely convert to graphite, so that the hardness and the wear resistance of the polycrystalline diamond compact are sharply reduced. Therefore, the metal sintering aid cobalt in the diamond layer of the polycrystalline diamond compact is removed, and the service performance of the polycrystalline diamond compact can be greatly improved.
The existing polycrystalline diamond compact structure is formed by sintering an upper layer of polycrystalline diamond and a lower layer of hard alloy substrate, in the strong acid cobalt removal process, the hard alloy substrate is not completely coated by the polycrystalline diamond layer, so that the strong acid corrodes the alloy substrate, the cobalt removal cannot be carried out for a long time, the cobalt removal reaction is limited, the depth of the cobalt removal layer is limited and is mostly 0.4-0.9mm, and the performance of the polycrystalline diamond compact is greatly reduced after the cobalt removal layer on the surface is worn in the use process of the PDC. The alloy below the polycrystalline diamond layer of the traditional diamond compact is easily corroded by acid and alkali in the process of stratum drilling, so that the compact loses the matrix support and fails prematurely.
Disclosure of Invention
Aiming at the problems, the invention provides a polycrystalline diamond compact structure, which adopts a cylindrical hard alloy core body to completely coat polycrystalline diamond on the outer surface of the core body, avoids the contact of the hard alloy and a cobalt removal liquid, solves the problem of sealing failure of cobalt removal, greatly improves the cobalt removal effect, increases the cobalt removal depth, avoids the failure of an alloy substrate in the drilling process, and greatly improves the working performance and the service life of the polycrystalline diamond compact.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for synthesizing a polycrystalline diamond compact is characterized by comprising the following steps: the synthesis method of the polycrystalline diamond compact comprises the following steps:
mixing, namely mixing the diamond particles with a metal catalyst;
coating, namely preparing the mixed diamond particles and metal catalyst mixture into a cylindrical shape, or coating the mixed diamond particles and metal catalyst mixture on the outer surface of the hard alloy core;
sintering, namely sintering the cylindrical mixture or the hard alloy core body coated with the mixture for 10 to 30 minutes under the conditions of 5 to 9GPa and 1400 to 1800 ℃;
forming, namely machining and forming the sintered diamond compact by adopting laser processing, electric spark processing or mechanical processing;
cobalt removal, namely soaking the processed and formed diamond composite sheet into cobalt removal liquid for 5-30 days to remove the metal catalyst;
and (2) coating a film, namely coating a welding agent affinity layer with the thickness of 5-100 um on the surface of the diamond of the cobalt-removed diamond composite sheet by a chemical deposition or physical diffusion method, wherein the welding agent affinity layer is a metal layer and comprises but is not limited to one or more of Ti, ni, co, ag and Mn, or one or more of metal compounds.
Further, the metal catalyst is metal cobalt, iron, nickel and manganese.
Furthermore, the granularity of the diamond particles is 1-60 mu m, and the mixing proportion of the diamond particles and the metal catalyst is 1-18%.
Further, the cobalt removing solution is sulfuric acid, nitric acid, hydrochloric acid, hydrofluoric acid or a mixed solution of 2 or three of them, the concentration of the solution is 30-80%, and the temperature of the solution is 30-110 ℃.
A polycrystalline diamond compact produced by the method is characterized in that: the polycrystalline diamond coating comprises a polycrystalline diamond layer, wherein the outermost layer of the polycrystalline diamond layer is a cobalt removal layer, the depth of the cobalt removal layer is 1.1-2 mm, a welding agent affinity layer with the thickness of 5-100 um is arranged outside the cobalt removal layer, the welding agent affinity layer is a metal layer, and metal comprises one or more of Ti, ni, co, ag and Mn or one or more of metal compounds.
Furthermore, a hard alloy core body is arranged inside the polycrystalline diamond layer, and the hard alloy core body is cylindrical.
Further, the hard alloy core body is made of tungsten carbide alloy.
Furthermore, the diameter of the hard alloy core body is phi 1-phi 24mm, and the height is 1-24 mm.
Furthermore, the diameter of the hard alloy core body is phi 3-phi 20mm, and the height is 2-18 mm.
Furthermore, the thickness of the polycrystalline diamond layer is 1.0-4.0 mm.
The invention has the beneficial effects that: through improving the structure of polycrystalline diamond compact, make and take off the cobalt in-process and take off the cobalt liquid and can not contact the carbide core, solved the sealed inefficacy problem of taking off the cobalt process, improve and take off the cobalt quality, very big improvement take off the degree of depth on cobalt layer, effectively promote polycrystalline diamond compact's performance and life.
Drawings
Fig. 1 is a schematic diagram of a longitudinal cross-sectional structure of an embodiment of a polycrystalline diamond compact.
Fig. 2 is a schematic diagram of a lateral cross-sectional structure of an embodiment of a polycrystalline diamond compact.
Fig. 3 is a schematic diagram of a longitudinal cross-sectional structure of an embodiment of a polycrystalline diamond compact.
Fig. 4 is a schematic diagram of a lateral cross-sectional structure of an embodiment of a polycrystalline diamond compact.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings.
Example 1:
a method for synthesizing a polycrystalline diamond compact is characterized by comprising the following steps: the synthesis method of the polycrystalline diamond compact comprises the following steps:
1. mixing diamond particles with the particle sizes of 1-2 and 10-20 mu m and a metal catalyst cobalt with the particle size of 1-3 mu m according to the ratio of 2: 5, mixing in proportion;
2. coating the mixture of the previous step on the outer surface of a cylindrical hard alloy core body, wherein the diameter of the hard alloy core body is 12mm, the height of the hard alloy core body is 9mm, and the thickness of the coated diamond particles is 2mm;
3. the materials are put into a high-temperature high-pressure container and sintered for 10 minutes under the conditions of 5-9 GPa and 1400-1800 ℃.
4. Processing the sintered diamond compact into a diamond compact with the diameter of 15.88mm and the height of 13.2mm by adopting electric spark processing;
5. and (3) soaking the processed and formed diamond compact in aqua regia at the temperature of 80 ℃ for 30 days to remove cobalt in the polycrystalline diamond layer and other WC (wolfram carbide) entering from the alloy matrix.
6. By a chemical deposition method, a welding agent affinity layer 4 with the thickness of 10 mu m is covered on the surface of the polycrystalline diamond composite sheet after cobalt removal, so that the polycrystalline diamond composite sheet is convenient to weld with a drill bit steel body or a matrix, and the metal layer is Ti.
The polycrystalline diamond compact synthesized by the method has the advantages that the diameter of the hard alloy core body 1 is 12mm, the height is 9mm, the thickness of the polycrystalline diamond layer 2 is 2mm, the depth of the cobalt removal layer 3 is 1.2mm measured by an X-ray nondestructive detector, the polycrystalline diamond compact prepared by the method is loaded on a rigid body or a matrix drill bit to be applied to experiments, and the drilling footage can be improved by 20 percent compared with that of a common plane tooth.
Example 2:
a method for synthesizing a polycrystalline diamond compact is characterized by comprising the following steps: the synthesis method of the polycrystalline diamond compact comprises the following steps:
1. mixing two kinds of diamond powder with the granularity of 3-6 microns and 20-30 microns in a ratio of 2: 5, mixing in proportion;
2. coating the mixture of the previous step on the outer surface of a cylindrical hard alloy core body, wherein the diameter of the hard alloy core body is 10.9mm, the height of the hard alloy core body is 8mm, and the thickness of the coated diamond particles is 2.5mm;
3. the materials are put into a high-temperature high-pressure container and sintered for 10 minutes under the conditions of 5-9 GPa and 1400-1800 ℃;
4. the polycrystalline diamond compact synthesized by the method is processed into a cylinder with the diameter of 15.88mm and the height of 13.2mm by a grinding machine;
5. soaking the formed diamond composite sheet in aqua regia at 70 ℃ for 35 days to remove metal cobalt and WC in the polycrystalline diamond layer;
6. by a physical diffusion method, an alloy layer with the thickness of 10um is covered on the surface of the polycrystalline diamond compact after cobalt removal, the alloy layer is a welding agent affinity layer 4, so that the polycrystalline diamond compact is convenient to weld with a drill bit steel body or a matrix, and the alloy layer is a titanium-nickel alloy.
The polycrystalline diamond compact synthesized by the method has the advantages that the diameter of the hard alloy core body 1 is 10.9mm, the height is 8mm, the thickness of the polycrystalline diamond layer 2 is about 2mm, the depth of the cobalt-removing layer 3 is 1.2mm measured by an X-ray nondestructive detector, the polycrystalline diamond compact prepared by the method is loaded on a rigid body or a matrix drill bit to be applied to experiments, and the drilling footage can be improved by 25 percent compared with that of a common plane tooth.
Example 3:
a method for synthesizing a polycrystalline diamond compact is characterized by comprising the following steps: the synthesis method of the polycrystalline diamond compact comprises the following steps:
1. mixing two kinds of diamond powder with the granularity of 3-6 microns and 20-30 microns and metal catalyst cobalt with the granularity of 1-3 microns according to the proportion of 2: 5, mixing in proportion;
2. making the mixture into a cylinder with diameter of 16.5mm and height of 15 mm;
3. the materials are put into a high-temperature high-pressure container and sintered for 10 minutes under the conditions of 5-9 GPa and 1400-1800 ℃;
4. the polycrystalline diamond compact synthesized by the method is processed into a cylinder with the diameter of 13.44mm and the height of 8.1mm by laser equipment;
5. soaking the formed diamond composite sheet in aqua regia at the temperature of 80 ℃ for 7-40 days to remove metal cobalt and WC in the polycrystalline diamond layer;
6. by a chemical deposition method, an alloy layer with the thickness of 10um is covered on the surface of the polycrystalline diamond compact after cobalt removal, the alloy layer is a welding agent affinity layer 4, so that the polycrystalline diamond compact is convenient to weld with a drill bit steel body or a matrix, and the alloy layer is a titanium-nickel alloy.
The diameter of the polycrystalline diamond compact synthesized by the method is 13.4mm, the height of the polycrystalline diamond compact is 8.1mm, the depth of the cobalt removal layer 3 is measured as complete cobalt removal by an X-ray nondestructive detector, the polycrystalline diamond compact prepared by the method is loaded on a rigid body or a matrix drill bit, and the drilling footage can be improved by 30 percent compared with that of a common plane tooth in an application experiment.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.
Claims (9)
1. A method for synthesizing a polycrystalline diamond compact is characterized by comprising the following steps: the synthesis method of the polycrystalline diamond compact comprises the following steps:
mixing, namely mixing the diamond particles with a metal catalyst;
coating, namely preparing the mixed diamond particles and metal catalyst mixture into a cylinder, or coating the mixed diamond particles and metal catalyst mixture on the outer surface of the hard alloy core;
sintering, namely placing the cylindrical mixture or the hard alloy core body coated with the mixture under the conditions of 5-9 GPa and 1400-1800 ℃ for sintering for 10-30 minutes;
forming, namely processing and forming the sintered diamond compact by adopting laser processing, electric spark processing or mechanical processing;
cobalt removal, namely soaking the processed and formed diamond composite sheet into cobalt removal liquid for 5-40 days to remove the metal catalyst;
covering a film, namely covering a welding agent affinity layer with the thickness of 5-100 um on the surface of the diamond of the cobalt-removed diamond composite sheet by a chemical deposition or physical diffusion method, wherein the welding agent affinity layer is a metal layer and comprises one or more of Ti, ni, co, ag and Mn, or one or more of metal compounds;
the metal catalyst is metal cobalt.
2. The method of synthesizing a polycrystalline diamond compact of claim 1, wherein: the granularity of the diamond particles is 1-60 mu m, and the mixing proportion of the metal catalyst is 1-18%.
3. The method of synthesizing a polycrystalline diamond compact of claim 1, wherein: the cobalt removing solution is a mixed solution of two or three of sulfuric acid, nitric acid, hydrochloric acid and hydrofluoric acid, the concentration of the mixed solution is 30-80%, and the temperature of the mixed solution is 30-110 ℃.
4. A polycrystalline diamond compact produced by the method of claim 1, wherein: including polycrystalline diamond layer (2), polycrystalline diamond layer (2) outmost be decobalt layer (3), decobalt layer (3) degree of depth is 1.1 ~ 2mm, decobalt layer (3) are equipped with a layer thickness outward and are 5 ~ 100 um's welding agent affinity layer (4), welding agent affinity layer (4) are the metal level, and the metal includes the alloy of one or several of Ti, ni, co, ag, mn, or one of them or several metal compound.
5. A polycrystalline diamond compact according to claim 4, wherein: the polycrystalline diamond layer (2) is internally provided with a hard alloy core body (1), and the hard alloy core body (1) is cylindrical.
6. A polycrystalline diamond compact according to claim 5, wherein: the hard alloy core body (1) is made of cobalt-based tungsten carbide alloy.
7. A polycrystalline diamond compact according to claim 5, wherein: the diameter of the hard alloy core body (1) is phi 1-phi 24mm, and the height is 1-24 mm.
8. A polycrystalline diamond compact according to claim 7, wherein: the diameter of the hard alloy core body (1) is phi 3-20 mm, and the height is 2-18 mm.
9. A polycrystalline diamond compact according to claim 4, wherein: the thickness of the polycrystalline diamond layer (2) is 1.0-4.0 mm.
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|---|---|---|---|---|
| GB0913304D0 (en) * | 2009-07-31 | 2009-09-02 | Element Six Ltd | Polycrystalline diamond composite compact elements and tools incorporating same |
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