Processing method for polycrystalline diamond

A technology of polycrystalline diamond and a processing method, which is applied in the process of applying ultra-high pressure and other directions, can solve the problem that the surface of polycrystalline diamond cannot be processed, and the uneven shape or pattern of the surface cannot be processed, and it is difficult to accurately make polycrystalline diamond. and other problems, to achieve the effect of high operability

Active Publication Date: 2018-06-22
ZHUHAI JUXIN TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The processing efficiency of the first method is low, and it has ablation effect on diamond, it is difficult to accurately make polycrystalline diamond with specific configuration or shape, and it cannot be processed for slightly more complicated hollow shapes
In the second way, it is impossible to process the surface of polycrystalline diamond into any uneven shape or pattern
The third method can only process cut surfaces, and it is impossible to prepare polycrystalline diamonds that are slightly more complex or have specific surface configurations or shapes.

Method used

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  • Processing method for polycrystalline diamond

Examples

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Effect test

Embodiment 1

[0035] A processing method for polycrystalline diamond, comprising the following steps:

[0036] (1) Prepare the mold: prepare the mold into the required specific shape, press the cemented carbide and cobalt mixed powder according to the year-on-year enlargement of 1.22 times 1.02 times, and burn it in a vacuum hydrogen furnace at 1400 ° C for 24 hours, sintering Become a mirror image mold, that is, the female mold;

[0037] (2) filling the diamond micropowder with a particle size of 1-30 μm and the mold according to the shape of the finished product in a graphite tube or a metal cup, and sintering and forming it under high temperature and high pressure conditions to make a semi-finished product;

[0038] (3) Using an corrosive solution to remove or corrode the mold on the semi-finished product to obtain polycrystalline diamond of desired configuration or structure, wherein the corrosive solution includes hydrofluoric acid and nitric acid.

[0039] The particle size of the ce...

Embodiment 2

[0046] A processing method for polycrystalline diamond, comprising the following steps:

[0047] (1) Prepare the mold: prepare the mold into a specific shape, press the cemented carbide and cobalt mixed powder according to the year-on-year enlargement of 1.20 times 1.05 times, and burn it in a vacuum hydrogen furnace at 1350°C for 26 hours to sinter into a mirror image mould, i.e. female mold;

[0048] (2) filling the diamond micropowder with a particle size of 1-30 μm and the mold according to the shape of the finished product in a graphite tube or a metal cup, and sintering and forming it under high temperature and high pressure conditions to make a semi-finished product;

[0049] (3) Using an corrosive solution to remove or corrode the mold on the semi-finished product to obtain polycrystalline diamond of desired configuration or structure, wherein the corrosive solution contains hydrofluoric acid and nitric acid.

[0050] Diamond micropowder becomes polycrystalline diamon...

Embodiment 3

[0056] A processing method for polycrystalline diamond, comprising the following steps:

[0057](1) Prepare the mold: prepare the mold into a specific shape, press the cemented carbide and cobalt mixed powder according to the magnification of 1.25 times 1.01 times, and burn it in a vacuum hydrogen furnace at 1450°C for 22 hours to sinter into a mirror image mould, i.e. female mold;

[0058] (2) Fill the diamond micropowder with a particle size of 1-30 μm and the mold according to the finished shape in a graphite tube or metal cup, join the matrix at the end of the diamond micropowder that is not joined to the mold, and then sinter under high temperature and high pressure conditions molding, and then cover the base with a protective sleeve to make a semi-finished product

[0059] (3) Corroding the mold on the semi-finished product with an etching solution to obtain polycrystalline diamond of a desired specific shape or configuration, wherein the etching solution contains hydro...

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Abstract

The invention discloses a processing method for polycrystalline diamond. The processing method comprises the following steps: (1) preparing a die; (2) filling a graphite pipe or a metal cup with diamond micropowder with the particle size of 1-30 mu m and the die according to the shape of a finished product, and carrying out sinter molding under the conditions of high temperature and high pressureto prepare a semi-finished product; and (3) removing the die on the semi-finished product by using sand blasting or a corrosive liquid to obtain the polycrystalline diamond with the required configuration or structure, wherein the corrosive liquid contains hydrofluoric acid and nitric acid. By using the processing method disclosed by the invention, the configuration or structure of the polycrystalline diamond can be processed into the required specific shape, the high-precision processing of the complex surface and spatial shape of the polycrystalline diamond can be realized, and therefore, special-shaped polycrystalline diamond is obtained; and compared with a traditional method, the processing method disclosed by the invention is cheaper, more convenient and rapider, free of special equipment and relatively high in operability.

Description

technical field [0001] The invention relates to polycrystalline diamond shape processing technology, in particular to a polycrystalline diamond processing method. Background technique [0002] Polycrystalline diamond (PCD) is synthesized with micron-sized diamond powder under high temperature and high pressure conditions. It has the advantages of wear resistance and hardness close to that of single crystal diamond. Due to its isotropic characteristics, there is no cleavage plane and the impact resistance is also improved. uplifted. Widely used in wire drawing dies, diamond composite sheets, turbo drilling tools, etc. For the processing of the surface configuration or shape of polycrystalline diamond, there are currently only three methods in the world: 1. Laser engraving (or laser cutting); 2. EDM cutting; 3. Grinding. The processing efficiency of the first method is low, and it has an ablation effect on the diamond. It is difficult to accurately make the polycrystalline d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J3/06
CPCB01J3/06
Inventor 周勃刘旭辉张琪张辰苏建安
Owner ZHUHAI JUXIN TECH DEV
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