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

AI Technical Summary

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

Method used

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  • Thermostable polycrystalline diamond composite piece and preparation method thereof

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Example Embodiment

[0030] Example 1

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

[0032] 1) After ball milling the diamond micropowder with a particle size of 6-12 μm and the metal catalyst Co powder with a particle size of 1-3 μm, put it into a shielding metal cup (molybdenum cup), and then put it into the tungsten-cobalt cemented carbide substrate, Assembled into assembled blocks (e.g. figure 1 (a), where 1 is the cemented carbide substrate, and 2 is the mixture of diamond micropowder and metal catalyst); the assembled block is placed in a vacuum furnace, and the vacuum degree is 6.0×10 -3 Pa, vacuum heat treatment is carried out under the condition of 500℃ for 2h;

[0033] After the vacuum heat-treated assembly block is put into the pressure transfer medium, the sintering pressure is 5.2GPa and the sintering temperature is 1400°C for 10 minutes for high ...

Example Embodiment

[0037] Example 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 that of Example 1):

[0039] 1) The diamond powder with a particle size of 15-25 μm and a metal catalyst nickel-iron alloy with a particle size of 1-3 μm are ball-milled and mixed into a metal cup (tantalum cup) that plays a shielding role, and then put into the tungsten-titanium-cobalt cemented carbide substrate. , assemble into an assembly block; place the assembly block in a vacuum furnace with a vacuum degree of 6.0 × 10 -3 Pa, the temperature is 700 ℃ and vacuum heat treatment is carried out for 5h;

[0040] After the vacuum heat-treated assembly block is put into the pressure transfer medium, the sintering pressure is 5.5 GPa and the sintering temperature is 1500 ℃ for 15 minutes to carry out high temperature and high pressure synthesis. After synthesis, demoulding and preprocessing a...

Example Embodiment

[0044] Example 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 that of Example 1):

[0046] 1) The mixed diamond micro-powder with a particle size of 6-12 μm and a particle size of 15-25 μm (the mass ratio of the two particle sizes of diamond micro-powders is 1:1) and the metal catalyst Co powder with a particle size of 1-3 μm are ball-milled and mixed into The shielding metal cup (molybdenum cup) is then put into the tungsten-titanium-tantalum cemented carbide substrate to assemble into an assembly block; the assembly block is placed in a vacuum furnace, and the vacuum degree is 6.0 × 10 -3 Pa, vacuum heat treatment for 5h under the condition of 600℃;

[0047] After the vacuum heat-treated assembly block is put into the pressure transfer medium, the sintering pressure is 5.8 GPa and the sintering temperature is 1500 ℃ for 30 minutes to carry out high ...

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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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