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Preparation method for carbon source for synthesizing large-size polycrystalline diamond

A polycrystalline diamond, large-scale technology, applied in chemical instruments and methods, ultra-high pressure process, graphite and other directions, can solve problems such as inconclusive, achieve high forming density, reduce loss, and uniform particle size.

Active Publication Date: 2018-06-15
ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The transformation mechanism of graphite to diamond under the condition of ultra-high pressure and high temperature has been discussed for decades, and no conclusion has been reached so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The invention provides a method for preparing a carbon source for synthesizing large-scale polycrystalline diamond, which specifically includes the following steps:

[0022] 1) Sieve the flake graphite for grain size, and take ≤600 mesh as the sample to be processed;

[0023] 2) Put the sample to be treated obtained in step 1) into a ball mill tank, add alcohol to mix it into a paste, then add steel balls, and mill on a ball mill for 8-30 hours;

[0024] 3) After the ball milling, pour the ball-milled graphite into the beaker with pure water, re-classify the particle size, select ≤5000 mesh and then settle;

[0025] 4) Pour off the clear water after precipitation, add hydrochloric acid and boil on an electric furnace for half an hour to further remove impurities, after natural cooling, wash with pure water until neutral, and dry the precipitate obtained after precipitation in a vacuum drying oven;

[0026] 5) The dried precipitate was subjected to H2O in a high-tempera...

Embodiment approach

[0028] As an embodiment of the present invention, the purity requirement of the flake graphite in step 1) of the preparation method is very high, ≥99.99%. The flake graphite of this purity can be purchased from LC(-) of Qingdao Baichuan Graphite Co., Ltd. 325-9999 flake graphite, the purpose of using high-purity flake graphite is to reduce the impurity content in the synthetic polycrystalline diamond and ensure the quality of polycrystalline diamond.

[0029] As an embodiment of the present invention, the mass of steel balls added in step 2) of the preparation method is 10 to 20 times the mass of graphite flakes of the sample to be treated. As another embodiment of the present invention, three sizes of steel balls, 6 mm, 8 mm, and 10 mm, are used in combination at a mass ratio of 2:3:5.

[0030] As an embodiment of the present invention, the ball milling pot used in step 2) of the preparation method is an iron ball milling pot. The reason for using the iron ball milling pot is...

Embodiment 1

[0034] In the present embodiment, the flaky graphite is screened for grain size with a vibrating screening machine, and 325 to 400 meshes are selected as the sample to be processed, from which 100 grams of graphite is put into an iron ball mill jar, and an appropriate amount of alcohol is added to form a paste, and then Add steel balls whose mass ratio is 10 times the weight of graphite (steel balls adopt three sizes of 6mm, 8mm, and 10mm and mix them according to the mass ratio of 2:3:5), tighten the ball mill jar to start ball milling, ball milling for 8 hours, and then use pure Rinse the ball-milled graphite into a beaker with water, re-classify the particle size, select a particle size below 700 mesh, and then precipitate; pour off the precipitated water, add an appropriate amount of hydrochloric acid, boil on an electric furnace for half an hour, further remove impurities, and cool naturally Afterwards, it was washed with pure water to neutrality, and the precipitate obtai...

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Abstract

The invention provides a preparation method for a carbon source for synthesizing large-size polycrystalline diamond. The method uses flake graphite as a raw material, and the carbon source for synthesizing large-size polycrystalline diamond is synthesized through screening, ball milling, fine processing and grading processes. The method allows the carbon source with a uniform particle size and a high molding density to be obtained, and reduces the pressure loss caused by the volume collapse reduction in the synthesis process. The graphitization degree, the porosity, the ash content, the resistivity and the crystal structure of the carbon source obtained by the preparation method can greatly reduce the pressure and the temperature needed by the synthesis of high-quality and large-size polycrystalline diamond, and can achieve the purposes of stable transformation and cost saving.

Description

technical field [0001] The invention belongs to the technical field of raw and auxiliary materials for superhard material production, in particular to a method for preparing a carbon source for synthesizing large-scale polycrystalline diamond. Background technique [0002] At present, there are two main ways to prepare large-scale polycrystalline diamond under high temperature and high pressure: one is to synthesize diamond from graphite, and then sinter diamond powder; the other is to directly transform graphite into polycrystalline diamond at one time. The pathway is formed by the direct conversion of graphite under the conditions of ultra-high pressure and high temperature of 14-18GPa and 2300-2600K. The overall performance of the polycrystalline diamond synthesized by the second way is far superior to the first way, which is the current and future development direction. Large-scale polycrystalline diamond can be widely used in geology, metallurgy, oil drilling and other...

Claims

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Application Information

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IPC IPC(8): C01B32/21C01B32/215B01J3/06
CPCB01J3/06
Inventor 张相法张奎薛磊王永凯位星鲁翠莲
Owner ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
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