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Polycrystalline diamond compact and synthetic method thereof

A technology of diamond composite sheet and polycrystalline diamond, which is used in earth-moving drilling, drilling equipment, drill bits, etc., can solve the problems of increasing the depth of decobalt, failure, etc., to improve the quality of decobalt, increase the depth, improve performance and service life Effect

Active Publication Date: 2021-07-09
重庆北思卡新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above problems, the present invention proposes a polycrystalline diamond composite sheet structure, which adopts a cylindrical hard alloy core body, so that the polycrystalline diamond is completely covered on its outer surface, avoiding the contact between the hard alloy and the decobalt solution, and solving the problem of The problem of sealing failure of cobalt removal greatly improves the effect of cobalt removal, increases the depth of cobalt removal, avoids the failure of the alloy substrate during drilling, and greatly improves the working performance and service life of the polycrystalline diamond composite sheet

Method used

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  • Polycrystalline diamond compact and synthetic method thereof
  • Polycrystalline diamond compact and synthetic method thereof
  • Polycrystalline diamond compact and synthetic method thereof

Examples

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Embodiment 1

[0029] A method for synthesizing a polycrystalline diamond compact, characterized in that: the method for synthesizing the polycrystalline diamond compact comprises:

[0030] 1. Mix diamond particles with a particle size of 1-2 and 10-20 μm in a ratio of 2:8 with metal catalyst cobalt with a particle size of 1-3 μm in a ratio of 95:5;

[0031] 2. Coat the mixture of the previous step on the outer surface of the cylindrical cemented carbide core, wherein the diameter of the cemented carbide core is 12 mm, the height is 9 mm, and the thickness of the coated diamond particles is 2 mm;

[0032] 3. Put the above materials into a high-temperature and high-pressure container, and sinter at 5-9GPa and 1400-1800°C for 10 minutes.

[0033] 4. Using electric discharge machining, the sintered diamond composite sheet is processed into a diamond composite sheet with a diameter of 15.88mm and a height of 13.2mm;

[0034] 5. Immerse the processed diamond composite sheet in aqua regia at a te...

Embodiment 2

[0038] A method for synthesizing a polycrystalline diamond compact, characterized in that: the method for synthesizing the polycrystalline diamond compact comprises:

[0039] 1. Mix two kinds of diamond powder with a particle size of 3-6μm and 20-30um in a ratio of 2:8 with metal catalyst cobalt with a particle size of 1-3μm in a ratio of 95:5;

[0040] 2. Coat the mixture of the previous step on the outer surface of the cylindrical cemented carbide core, wherein the diameter of the cemented carbide core is 10.9 mm, the height is 8 mm, and the thickness of the coated diamond particles is 2.5 mm;

[0041] 3. Put the above materials into a high-temperature and high-pressure container, and sinter at 5-9GPa and 1400-1800°C for 10 minutes;

[0042] 4. The polycrystalline diamond composite sheet synthesized by the above method is processed into a cylinder with a diameter of 15.88mm and a height of 13.2mm by a grinder;

[0043] 5. Immerse the processed diamond composite sheet in aqu...

Embodiment 3

[0047] A method for synthesizing a polycrystalline diamond compact, characterized in that: the method for synthesizing the polycrystalline diamond compact comprises:

[0048]1. Mix two kinds of diamond powder with a particle size of 3-6μm and 20-30um in a ratio of 2:8 with metal catalyst cobalt with a particle size of 1-3μm in a ratio of 95:5;

[0049] 2. Make the above mixture into a cylinder with a diameter of 16.5mm and a height of 15mm;

[0050] 3. Put the above materials into a high-temperature and high-pressure container, and sinter at 5-9GPa and 1400-1800°C for 10 minutes;

[0051] 4. The polycrystalline diamond composite sheet synthesized by the above method is processed into a cylinder with a diameter of 13.44mm and a height of 8.1mm by laser equipment;

[0052] 5. Immerse the processed diamond composite sheet in aqua regia at a temperature of 80°C for 7-40 days to remove metal cobalt and WC in the polycrystalline diamond layer;

[0053] 6. By means of chemical depo...

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Abstract

The invention discloses a synthetic method for a polycrystalline diamond compact. The method comprises the steps that a mixture of a large number of diamond particles and metal catalysts is directly sintered or coated around a hard alloy core body, sintering at the pressure of 5-8.5 GPa and the temperature of 1400-1700 DEG C is performed to form the polycrystalline diamond compact, molding is performed by laser or mechanical processing, then cobalt-removal mixture soaking is performed for 5-30 days, the metal catalysts in gaps of all or most polycrystalline diamonds are removed, a cobalt-removal layer with the depth being 1.1-2 mm is arranged on the surface layer of the diamond compact, a welding agent affinity layer with the thickness being 5-100 micrometers is arranged outside the cobalt-removal layer, 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 exploitation of petroleum, natural gas and shale gas.

Description

technical field [0001] The invention belongs to the technical field of diamond composite sheets, and in particular relates to a polycrystalline diamond composite sheet and a synthesis method thereof. Background technique [0002] Polycrystalline diamond compact (or PDC) is a composite superhard material with excellent performance. It is formed by sintering micron-sized diamond particles and sintering catalyst on the cemented carbide sink under high temperature and high pressure conditions. Polycrystalline diamond not only retains the high hardness, high heat resistance, and corrosion resistance of diamond particles, but also has weldability comparable to alloys. It is used in hard material processing, geological drilling, mineral mining, shield construction, and oil and gas exploration. It has a wide range of applications in mining and other fields. [0003] Sintering aid plays an important role in promoting the preparation of PDC, but it is also an important factor leading...

Claims

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Application Information

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IPC IPC(8): B22F5/00B22F7/08B22F3/14B22F3/24E21B10/46
CPCB22F5/00B22F7/08B22F3/14B22F3/24E21B10/46B22F2003/242B22F2005/001B22F2003/244
Inventor 陈本富
Owner 重庆北思卡新材料股份有限公司
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