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Synthesis technique of high-grade self-sharpening polycrystalline diamond

A technology of polycrystalline diamond and synthesis process, which is applied in the application of ultra-high pressure process, etc., can solve the problems of low impact toughness, high processing cost, low grade of polycrystalline diamond, etc., and achieve impact toughness and Excellent thermal stability, comprehensive performance, improved life and processing efficiency, and improved nucleation and growth rates

Inactive Publication Date: 2014-01-22
ZHONGYUAN ENGINEERING COLLEGE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]The application of single crystal diamond has certain disadvantages: due to the cleavage surface, it is easy to passivate after a period of time during the grinding process; If the whole is pulled out from the matrix, the grinding effect will be lost, and the effectiveness of the diamond cannot be fully utilized, resulting in an increase in processing costs
[0005] However, the current self-sharpening polycrystalline diamond products have low output, low quality, low strength, low impact toughness, and poor thermal stability
The researchers of the present invention have found through research that the main reason why polycrystalline diamond has not been popularized and applied is that polycrystalline diamond has low grade and poor comprehensive performance.

Method used

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  • Synthesis technique of high-grade self-sharpening polycrystalline diamond

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Embodiment 1

[0023] Embodiment 1: a kind of synthesis process technology of high-grade self-sharpening polycrystalline diamond, comprising the steps:

[0024] (1) The carbon source graphite, catalyst, active rare earth element and nano-diamond, the raw materials of synthetic diamond, are measured, mixed, granulated and pressed into synthetic rods according to the mass percentage; the mass percentage of the raw materials is: carbon source graphite 25~ 30%, active rare earth elements 0.008-0.02%, nano-diamond 0.5-0.8%, and the balance is catalyst.

[0025] (2) The synthetic rod pressed in step (1) is put into a synthetic block, and the assembled synthetic block is placed in a vacuum drying box for constant temperature drying for use.

[0026] (3) The synthetic block assembled in step (2) is synthesized by a six-sided top press through ultra-high pressure and high temperature.

[0027] (4) Take out the synthetic rod synthesized in step (3), obtain self-sharpening polycrystalline diamond afte...

Embodiment 2

[0028] Embodiment 2: a synthetic process technology of high-grade self-sharpening polycrystalline diamond, is characterized in that comprising the steps:

[0029] (1) The carbon source graphite, catalyst, active rare earth element and nano-diamond, the raw materials of synthetic diamond, are measured, mixed, granulated and pressed into synthetic rods according to the mass percentage; the mass percentage of the raw materials is: carbon source graphite 25~ 30%, active rare earth elements 0.008-0.02%, nano-diamond 0.5-0.8%, and the balance is catalyst.

[0030]Among them, the carbon source graphite is a mixture of 99% flake natural graphite and 1% carbon nanotubes, % are mass percentages, and the particle size of flake natural graphite is 200 mesh; the catalyst is used as a catalyst, and the catalyst adopts gas atomized iron, manganese and nickel. Cobalt metal alloy powder: Nanodiamond is produced by the detonation method as a co-nucleating agent, and the particle size distributi...

Embodiment 3

[0037] Embodiment 3: A synthesis technology of high-grade self-sharpening polycrystalline diamond, the drying temperature in step (4) is preferably 800°C. Other steps are the same as in Example 2.

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Abstract

The invention relates to a synthesis technique of a high-grade self-sharpening polycrystalline diamond, which comprises the following steps: metering and mixing the raw materials for synthesizing the diamond according to percentage by mass, granulating, and pressing into a synthetic stick; putting the synthetic stick into a synthesis block, and drying in a vacuum drying oven at constant temperature for later use, wherein the synthesis block is synthesized at high temperature under superhigh pressure with a cubic press; and taking out the synthetic stick, carrying out after-treatment to obtain a self-sharpening polycrystalline diamond, carrying out in-situ polymerization by a sol-gel process, and applying a zirconia coating on the diamond surface to form the high-grade self-sharpening polycrystalline diamond. The product has the advantages of favorable impact toughness, favorable thermal stability and favorable comprehensive properties, can obviously enhance the holding force of the self-sharpening polycrystalline diamond in a grinding tool, can keep the self-sharpness in the grinding process, and finally, is beneficial to prolonging the service life of th grinding tool and enhancing the machining efficiency of the grinding tool.

Description

technical field [0001] The invention belongs to the technical field of synthesis of superhard materials, and in particular relates to a synthesis technology of self-sharpening polycrystalline diamond. Background technique [0002] Diamond is a superhard material with high hardness. It is mainly used to make various diamond tools, such as grinding tools, wire drawing dies, cutting tools and drilling tools. The diamonds produced in the world are mainly single crystals, which have been widely used. Man-made and natural diamonds are mostly single crystals, and the crystal itself is a complete large grain. Single crystal is a single particle with a complete crystal shape, and the lattice inside the particle is arranged periodically and has anisotropy; polycrystal is a particle with multiple crystal grains, and the lattice of each crystal grain is arranged periodically , is isotropic. Polycrystalline is a collection of single crystals with many oriented grains, and crystals are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J3/06
Inventor 张旺玺聂建军王占勇刘磊卢金斌王艳芝蔡森李启泉梁宝岩
Owner ZHONGYUAN ENGINEERING COLLEGE
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