Thermostable polycrystalline diamond composite piece and preparation method thereof

A polycrystalline diamond, thermally stable technology, used in drilling equipment, earth-moving drilling, drill bits, etc., can solve the problem of reducing the mechanical properties of the polycrystalline diamond composite sheet and the cemented carbide substrate. The bonding strength of the polycrystalline diamond layer and the cemented carbide substrate, etc. problems, to achieve the effects of high social value and economic benefits, high thermal stability and wear resistance, and excellent comprehensive mechanical properties

Inactive Publication Date: 2015-12-16
FUNIK ULTRAHARD MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a thermally stable polycrystalline diamond composite sheet to solve the problem of reducing the mechanical properties of the polycrystalline diamond composite sheet hard alloy substrate and the bonding strength between the polycrystalline diamond layer and the hard alloy substrate The problem

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  • Thermostable polycrystalline diamond composite piece and preparation method thereof

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Embodiment 1

[0031] The thermally stable polycrystalline diamond compact of the present embodiment is prepared by the following method (the preparation process is as follows: figure 1 shown):

[0032] 1) Put the diamond powder with a particle size of 6-12 μm and the metal catalyst Co powder with a particle size of 1-3 μm into a metal cup (molybdenum cup) that acts as a shield, and then put it into a tungsten-cobalt cemented carbide substrate. Assembled into assembly blocks (such as figure 1 (a), wherein 1 is a cemented carbide substrate, and 2 is a mixture of diamond micropowder and metal catalyst); the assembly block is placed in a vacuum furnace, and the vacuum degree is 6.0 × 10 -3 Pa, the temperature is 500 ℃ under the condition of vacuum heat treatment for 2h;

[0033] Put the assembly blocks that have undergone vacuum heat treatment into the pressure transmission medium, and keep them warm for 10 minutes at a sintering pressure of 5.2GPa and a sintering temperature of 1400°C for hi...

Embodiment 2

[0038] The thermally stable polycrystalline diamond composite sheet of the present embodiment is prepared by the following method (the preparation process is the same as in Example 1):

[0039] 1) Put the diamond powder with a particle size of 15-25 μm and the metal catalyst nickel-iron alloy ball mill with a particle size of 1-3 μm into the metal cup (tantalum cup) that acts as a shield, and then put it into the tungsten-titanium-cobalt cemented carbide substrate , assembled into assembly blocks; place the assembly blocks in a vacuum furnace at a vacuum degree of 6.0×10 -3 Pa, the temperature is 700 ℃ under the condition of vacuum heat treatment for 5h;

[0040] Put the vacuum heat-treated assembly block into the pressure transmission medium, keep it warm for 15 minutes at a sintering pressure of 5.5GPa and a sintering temperature of 1500°C for high-temperature and high-pressure synthesis, demould after synthesis and pre-process to obtain a polycrystalline diamond composite; ...

Embodiment 3

[0045] The thermally stable polycrystalline diamond composite sheet of the present embodiment is prepared by the following method (the preparation process is the same as in Example 1):

[0046] 1) Mix the mixed diamond powder with a particle size of 6-12 μm and 15-25 μm (the mass ratio of the two particle sizes of diamond powder is 1:1) and the metal catalyst Co powder with a particle size of 1-3 μm, and then load it into the ball mill. Shielding effect of the metal cup (molybdenum cup), and then put the tungsten titanium tantalum carbide substrate, assembled into an assembly block; the assembly block is placed in a vacuum furnace at a vacuum degree of 6.0 × 10 -3 Pa, the temperature is 600 ℃ under the condition of vacuum heat treatment for 5h;

[0047] Put the vacuum heat-treated assembly block into the pressure transmission medium, keep it warm for 30 minutes under the conditions of sintering pressure 5.8GPa and sintering temperature 1500°C for high-temperature and high-pres...

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Abstract

The invention discloses a thermostable polycrystalline diamond composite piece and a preparation method thereof. The thermostable polycrystalline diamond composite piece is prepared through the following steps of: coating a plastic layer on the surface of a hard alloy matrix of a polycrystalline diamond composite body compounded through high temperature and high pressure; and then immersing the coated polycrystalline diamond composite body into acid liquor so as to perform acid cooking. According to the thermostable polycrystalline diamond composite piece disclosed by the invention, the plastic layer is coated on the surface of the hard alloy matrix of the polycrystalline diamond composite body during preparing the thermostable polycrystalline diamond composite piece, and only the surface of a polycrystalline diamond layer is exposed into the acid liquor when the acid cooking is performed so as to prevent the hard alloy matrix and joints between the polycrystalline diamond layer and the hard alloy matrix from being damaged by the acid liquor. Compared with a conventional polycrystalline diamond composite piece, the thermostable polycrystalline diamond composite piece disclosed by the invention has excellent synthesized mechanical properties, particularly has high heat stability and a good abrasion resistant property, is suitable for the application fields of oil drilling, geological drilling, coal mining and the like, and has a high social value and high economic benefits.

Description

technical field [0001] The invention belongs to the technical field of polycrystalline diamond composite sheets, in particular to a thermally stable polycrystalline diamond composite sheet, and also relates to a preparation method of a thermally stable polycrystalline diamond composite sheet. Background technique [0002] Polycrystalline diamond compact (Polycrystallinediamondcompact, PDC) is made by adding a certain amount of catalyst to diamond powder and assembling it with a cemented carbide substrate, and then sintering it on a special diamond hydraulic press under ultra-high temperature and high pressure conditions. It is composed of a polycrystalline diamond layer and a cemented carbide substrate. Due to the high hardness and good wear resistance of the polycrystalline diamond layer, coupled with the good toughness and weldability of the cemented carbide substrate, it is widely used in oil drilling, geological drilling and coal fields. Widely used in mining application...

Claims

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Application Information

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IPC IPC(8): E21B10/46
Inventor 王彬彬
Owner FUNIK ULTRAHARD MATERIAL
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