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Preparation method and product of polycrystalline diamond composite sheet with uniform microstructure

A polycrystalline diamond and microstructure technology is applied in the field of superhard composite materials to achieve the effect of extending the overall service life, improving the collapse resistance and improving the thermal stability.

Active Publication Date: 2021-05-18
SF DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a preparation method and product of a polycrystalline diamond composite sheet with a uniform microstructure. The present invention solves the problem of eruptive penetration of a polycrystalline diamond composite sheet interface catalyst through sequentially performing multiple high-temperature and high-pressure sintering treatments. The problem of local agglomeration, thereby greatly improving the thermal stability and impact resistance of the composite sheet, and then improving the anti-collapse and anti-delamination effects of the composite sheet during use

Method used

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  • Preparation method and product of polycrystalline diamond composite sheet with uniform microstructure
  • Preparation method and product of polycrystalline diamond composite sheet with uniform microstructure
  • Preparation method and product of polycrystalline diamond composite sheet with uniform microstructure

Examples

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Effect test

Embodiment 1

[0023] In this example, the single-treatment high-temperature and high-pressure sintering process in the prior art is used to prepare polycrystalline diamond composite sheets. Specifically, after the diamond powder and catalyst are assembled in the cemented carbide matrix, the polycrystalline diamond composite sheet is prepared at 1550 ° C and 9.0 GPa pressure conditions. Sinter down for 320s, and finally release the pressure after the equipment cools down to get the polycrystalline diamond composite sheet, its microstructure is as follows figure 1 As shown, the catalyst penetrates into the polycrystalline diamond layer 100 from the interface 210 of the cemented carbide substrate 200, and forms a local agglomeration 201, while the catalyst particles 102 are also dispersed in the partial interstitial region of the diamond particles 101 in the polycrystalline diamond layer 100 103 inside.

Embodiment 2

[0025] This embodiment adopts the two-stage high-temperature and high-pressure sintering treatment described in the present invention to prepare the polycrystalline diamond composite sheet. Specifically, after the diamond powder and the catalyst are assembled in the cemented carbide matrix, the first step is carried out. Stage high temperature and high pressure sintering treatment, the temperature of the first stage high temperature and high pressure sintering treatment is 1450°C, the pressure is 9.0 GPa, and the sintering time is 100s; then the second stage of high temperature and high pressure sintering treatment is carried out, and the temperature of the second stage high temperature and high pressure sintering treatment is 1500°C, pressure 9.0 GPa, sintering time 220s. Finally, after the equipment is cooled, the pressure is released to obtain a polycrystalline diamond composite sheet. The polycrystalline diamond composite sheet prepared in this example has a diameter of 15.8...

Embodiment 3

[0027] This embodiment adopts the two-stage high-temperature and high-pressure sintering treatment described in the present invention to prepare the polycrystalline diamond composite sheet. Specifically, after the diamond powder and the catalyst are assembled in the cemented carbide matrix, the first step is carried out. Stage high temperature and high pressure sintering treatment, the temperature of the first stage high temperature and high pressure sintering treatment is 1420°C, the pressure is 8.0 GPa, and the sintering time is 85s; then the second stage of high temperature and high pressure sintering treatment is carried out, and the temperature of the second stage high temperature and high pressure sintering treatment is 1550°C, the pressure is 9.2 GPa, the sintering time is 250s. Finally, after the equipment is cooled, the pressure is released to obtain a polycrystalline diamond composite sheet. Finally, after the equipment is cooled, the pressure is released to obtain a p...

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Abstract

The invention belongs to the technical field of superhard composite materials, and in particular relates to a preparation method and product of a polycrystalline diamond composite sheet with a uniform microstructure. Step, the high temperature and high pressure sintering step includes at least two stages of high temperature and high pressure sintering treatment in sequence, and the temperature of each high temperature and high pressure sintering treatment increases sequentially, and the pressure is the same or increases sequentially. The present invention solves the problem of local agglomeration formed by eruptive penetration of catalysts at the interface of the polycrystalline diamond composite sheet through sequentially performing multiple high-temperature and high-pressure sintering treatments, thereby greatly improving the thermal stability, impact resistance, etc. of the composite sheet, and further improving Anti-collapse and anti-delamination effects of the composite sheet during use.

Description

technical field [0001] The invention belongs to the technical field of superhard composite materials, and in particular relates to a preparation method and a product of a polycrystalline diamond composite sheet with uniform microstructure. Background technique [0002] Polycrystalline diamond composite sheet is a composite material formed by sintering a diamond layer and a cemented carbide substrate in a high temperature and high pressure (HTHP) environment. It is used in wear-resistant cutting elements for drilling tools such as oil and natural gas. However, in the traditional single-treatment high-temperature and high-pressure process, the catalyst in the cemented carbide substrate melts and rapidly increases, which causes the catalyst in the substrate to penetrate into the polycrystalline diamond layer in an eruptive manner, resulting in the presence of partially agglomerated catalysts or other substrates in the polycrystalline diamond layer. Element. Partial catalysts o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/14B22F1/00C22C26/00
CPCB22F1/0003B22F3/14C22C26/00
Inventor 赵东鹏方海江王勇峰李锦程戎卧龙杨健
Owner SF DIAMOND CO LTD