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Use of nonmetal catalyst in synthetic diamond

A synthetic, non-metallic technology, applied in the application of ultra-high pressure process, etc., can solve the problems of unable to meet market demand, limit the development and application of special diamond, lack of in-depth understanding, etc., to achieve complete crystal form and average compression resistance Increased strength and uniform particle size distribution

Inactive Publication Date: 2015-11-04
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At this stage, artificially synthesized diamond has achieved great success, but there are still some problems. For example, the product has many shortcomings in terms of yield, crystal shape, inclusions, color, strength and other physical properties. With the advancement of science and technology and the demand for special properties of diamond Further improvement and amplification, unable to meet the market demand in more stringent and demanding fields
Secondly, most of the catalysts used in diamond synthesis are metals and their alloys. The lack of in-depth understanding of the carbon phase transition process and kinetic mechanism under the action of catalysts further limits the development and application of special diamonds synthesized with diverse catalysts.

Method used

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  • Use of nonmetal catalyst in synthetic diamond

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Experimental program
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Effect test

Embodiment 1

[0021] The application of the non-metallic catalyst in the artificial synthesis of diamond in the present embodiment comprises the following steps: the synthetic block uses semi-sintered magnesium oxide as the pressure transmission medium, the graphite furnace as the heating body, and uses high-purity graphite powder as the carbon source and Se crystal powder as the Non-metallic catalyst, the purity of Se crystal powder is >99.9%, the particle size is 80 mesh, the mass ratio of high-purity graphite powder to Se crystal powder is 1:1, and the layered contact assembly process is adopted. After reduction and vacuum treatment, the synthetic The block is placed in a six-to-eight (6 / 8) two-stage increased large cavity high-pressure device, and synthesized under the conditions of a diamond thermodynamically stable zone with a pressure of 9.6GPa and a temperature of 1850°C for 60 minutes. figure 1 It is the electron micrograph of diamond before acid treatment in this embodiment.

[00...

Embodiment 2

[0027] The application of the non-metallic catalyst in the artificial synthesis of diamond in the present embodiment comprises the following steps: the synthetic block uses semi-sintered magnesium oxide as the pressure transmission medium, the graphite furnace as the heating body, the high-purity graphite powder as the carbon source and the Se crystal powder as the non-metallic catalyst. Metal catalyst, the purity of Se crystal powder is >99.9%, the particle size is 200 mesh, the mass ratio of graphite to Se crystal powder is 1:2, the powder is mixed and assembled, after reduction and vacuum treatment, the synthetic block is put into six containing eight (6 / 8) In the two-stage increased large cavity high-pressure device, it was synthesized under the conditions of a pressure of 9.6GPa and a temperature of 1900°C in the diamond thermodynamic stable zone for 60 minutes.

[0028] The application of the non-metallic catalyst of the present embodiment in the synthetic diamond compris...

Embodiment 3

[0033] In the present embodiment, the application of non-metallic catalyst in synthetic diamond comprises the following steps: the synthetic block uses pyrophyllite as the pressure transmission medium, the graphite furnace is the heating body, and the high-purity graphite powder is used as the carbon source and Se crystal powder as the non-metallic catalyst , the purity of the Se crystal powder is >99.9%, the particle size is 300 mesh, the mass ratio of the high-purity graphite powder to the Se crystal powder is 1:3, the powder is mixed and assembled, and after reduction and vacuum treatment, the synthetic block is put into a six-containing Eight (6 / 8) two-stage increased large-cavity high-pressure devices were synthesized under the conditions of diamond thermodynamic stability zone pressure 9GPa and temperature 1900°C for 120 minutes.

[0034] The application of the non-metallic catalyst of the present embodiment in the synthetic diamond comprises the following steps:

[0035...

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Abstract

The invention discloses a use of a nonmetal catalyst in synthetic diamond. Graphite as a carbon source and inorganic non-metallic elements such as Se and / or Te are synthesized into diamond. Under the conditions of a high temperature and high pressure, the non-metallic catalyst Se and Te crystals are in a melt state. The diamond grows in a liquid isotropic environment and has complete crystal structures and uniform particle size distribution. Under special synthesis environmental conditions, mean compressive strength of the diamond is greatly improved than that of the common industrial synthetic diamond. The diamond crystal contains a trace amount of catalyst elements Se and Te which are semiconductor materials and polyelectron systems, realizes diamond semiconductor characteristics by doping and is a novel high temperature-resistant semiconductor material.

Description

technical field [0001] The invention relates to the application of non-metallic catalyst in the field of synthetic diamond, in particular to the application of selenium and / or tellurium in synthetic diamond. Background technique [0002] Diamond has many excellent physical and chemical properties. It is a kind of extreme functional material. It is widely used in petroleum, machinery, stone, electronics, chemical industry, transportation and other industrial fields. It also plays an important role in national defense, medical treatment, technology, decoration and other fields. Role. In synthetic diamond, graphite is often used as the carbon source, but the transformation from graphite-structured carbon to diamond-structured carbon requires abnormally high temperature and pressure (usually temperature > 2000°C, pressure > 12GPa), and the cost is extremely high, which is not conducive to industry. Production. At present, the main method of artificially synthesizing diam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J3/06
Inventor 吕世杰杜凯建青媛王翚张乐李立本
Owner HENAN UNIV OF SCI & TECH