A kind of graphite core column material and preparation method thereof

A technology of graphite core column and graphite layer, which is applied in the field of superhard material graphite core column synthesis, can solve the problems of insufficient penetration, influence, and impact on the output and quality of artificial diamond, and achieve the purpose of increasing output and quality, improving catalytic performance, increasing The effect of a large contact area

Active Publication Date: 2016-04-06
ZHONGNAN DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the insufficient penetration of the traditional powdered graphite core column, it affects the graphite crystallization and diamond crystal precipitation process during alloy melting, which in turn affects the output and quality of synthetic diamond.

Method used

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  • A kind of graphite core column material and preparation method thereof
  • A kind of graphite core column material and preparation method thereof
  • A kind of graphite core column material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0019] A kind of preparation method of graphite core column material, concrete steps are as follows:

[0020] The first step: using the sol-gel method to prepare nano-iron oxide powder with uniform particle size; 2 In the atmosphere, using 99.93% pure nickel block as raw material, nano-nickel powder with uniform particle size was prepared by plasma arc method; nano-iron oxide powder, nano-nickel powder and nano-graphite powder were taken and mixed to obtain nano-mixed powder; , in terms of Fe / Ni, the molar ratio of iron oxide powder to nickel powder is 1:1; the mass percentage of graphite powder in the mixed powder is 60%.

[0021] The second step: place the nano-mixed powder in a closed system for vacuuming, at a vacuum degree of 10 -3 Pa, filled with hydrogen, heated to 1200 ° C for 8 hours to achieve reduction treatment, remove the oxygen content in it, and improve the catalyst activity.

[0022] Step 3: After the heat preservation heat treatment in the second step, the t...

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PUM

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Abstract

The invention belongs to the technical field of superhard material graphite core column synthesis, and discloses a graphite core column material and a preparation method thereof. The material is composed of graphite layers and metal catalyst molecule layers, and the metal catalyst molecule layers are interposed between the graphite layers. Take iron oxide powder, nickel powder and graphite powder and mix them evenly to obtain a mixed powder; place the mixed powder in a closed system to evacuate, then fill it with hydrogen, heat it to 1000-1500°C for 7-15 hours for reduction treatment, first Lower the temperature to 200-700°C and keep it warm for 1-5h to realize intercalation. When the temperature is lowered to less than 200°C, cool down to room temperature while introducing air to obtain the graphite core column material. The invention inserts a layer of metal catalyst molecules every 20 graphite layers, fully makes the graphite atoms contact with the metal catalyst molecules, and effectively improves the catalytic performance of the metal catalyst.

Description

technical field [0001] The invention belongs to the technical field of superhard material graphite core column synthesis, and in particular relates to a graphite core column material and a preparation method thereof. Background technique [0002] It is generally believed in the superhard material industry that graphite and metal alloys interpenetrate under high temperature and high pressure conditions. The molten alloy most preferentially infiltrates along the cracks and pores in the graphite, and cuts the graphite into small pieces or strips. The penetration or dissolution of graphite into metal alloys is in the form of atoms and groups of atoms. Under the condition that the temperature is not too high, graphite enters the alloy in the form of atoms. As the temperature increases, the alloy is further melted, and the graphite begins to recrystallize in the alloy in the form of dendritic graphite, and then diamond crystals begin to grow. [0003] Due to the insufficient pen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04
Inventor 贾攀刘乾坤赵鑫王志涛张亚东邢志华
Owner ZHONGNAN DIAMOND CO LTD
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