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Artificial synthesis method for gem-quality colorless diamond

An artificial synthesis, diamond technology, applied in chemical instruments and methods, single crystal growth, polycrystalline material growth and other directions, can solve the problems of large influence of synthesis particle size, low yield, limited growth space, etc., to achieve uniform and high-quality synthesis , fully absorb, prevent the effect of ginseng

Active Publication Date: 2017-10-20
HENAN POWER NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is based on the principle of temperature difference method, and carbon atoms are deposited on the crystal bed through the catalyst layer at high temperature by stacking to achieve growth. Due to the limitation of structure and growth principle, the growth space is limited, and the yield of single synthesis is not high. , and the synthetic particle size is greatly affected by the thickness of the catalyst layer, so it is difficult to realize the synthesis of large-grained diamonds and high yields

Method used

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  • Artificial synthesis method for gem-quality colorless diamond
  • Artificial synthesis method for gem-quality colorless diamond
  • Artificial synthesis method for gem-quality colorless diamond

Examples

Experimental program
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Effect test

Embodiment 1

[0056] A kind of synthetic method of gem grade colorless diamond, comprises the following steps:

[0057] (1) Preparation of diamond growth layer:

[0058] Take the Fe-based metal catalyst Fe with a particle size of 10-50 μm 65 Ni 30 co 5 , natural graphite with a particle size of 5-40 μm (purity ≥ 99.99%) and trace element Cu (purity ≥ 99.9%) are mixed according to a mass ratio of 50:50:0.5, and then the above-mentioned mixture is added to the three-dimensional mixer Mix under room temperature for 12 hours, carry out isostatic pressing 240Mpa, granulate (particle diameter is 4~6mm), be pressed into the cylindrical diamond growth layer that thickness is 10mm, diameter is 40mm; High vacuum reduction at 850°C for 24 hours, after the reduction is completed, the temperature is naturally cooled to room temperature, and then vacuum packaged for use;

[0059] (2) Preparation of diamond synthesis column:

[0060] ①.Using conventional methods to prepare high-purity magnesium oxide...

Embodiment 2

[0078] A kind of synthetic method of gem grade colorless diamond, comprises the following steps:

[0079] (1) Preparation of diamond growth layer:

[0080] Take the Fe-based metal catalyst Fe with a particle size of 2-40 μm 65 Ni 30 co 5 , high-purity graphite (purity ≥ 99.99%) with a particle size of 2-40 μm and trace element Cu (purity ≥ 99.9%) are mixed according to a mass ratio of 70:30:1, and then the above-mentioned mixture is added to the three-dimensional mixer Mix at medium temperature for 12 hours, carry out isostatic pressing at 240Mpa, granulate (particle size is 4-6mm), and press into a cylindrical diamond growth layer with a thickness of 8mm and a diameter of 40mm; after the pressing is completed, the prepared diamond growth layer Under the condition of a temperature of 800°C, it was reduced in a high vacuum for 24 hours. After the reduction was completed, the temperature was naturally cooled to room temperature, and then vacuum-packed for use;

[0081] (2) P...

Embodiment 3

[0100] A kind of synthetic method of gem grade colorless diamond, comprises the following steps:

[0101] (1) Preparation of diamond growth layer:

[0102] Take the Fe-based metal catalyst Fe with a particle size of 2-50 μm 70 Ni 29 co 1 , natural graphite (purity ≥ 99.99%) with a particle size of 2 to 40 μm and trace element Ti (purity ≥ 99.9%) are mixed according to a mass ratio of 50:50:0.5, and then the above-mentioned mixture is added to the three-dimensional mixer Mix under room temperature for 16 hours, carry out isostatic pressing 300Mpa, granulate (particle diameter is 4~6mm), be pressed into the cylindrical diamond growth layer that height is 25mm, diameter is 35mm; High vacuum reduction at 900°C for 30 hours, after the reduction is completed, the temperature is naturally cooled to room temperature, and then vacuum packaged for later use;

[0103] (2) Preparation of diamond synthesis column:

[0104] ①.Using conventional methods to prepare high-purity magnesium ...

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Abstract

The invention discloses an artificial synthesis method for a gem-quality colorless diamond. The method comprises the following steps: firstly pressing a Fe-based metallic catalyst, high-purity graphite and a microelement into a diamond growth layer; placing the diamond growth layer and a nitrogen removal metal layer in a high-purity magnesium oxide cup in different arrangement modes to form a diamond synthesis column; sequentially arranging a heating carbon tube, a pressure transfer salt tube and composite pyrophyllite outside the diamond synthesis column, arranging a heating carbon plate and an electric conductive metal ring at the two ends to combine to form a diamond synthesis block; drying the diamond synthesis block in vacuum, putting the dried diamond synthesis block in a high temperature press for 24-300 hours at the temperature of 1300-1500 DEG C and under the pressure of 5.5-6.5 GPa, and synthesizing at the high temperature and the high pressure to prepare the colorless diamond. The structure used in the method is reasonable, the preparation operation is simple, the cost is low, the crystal form of the obtained colorless diamond is intact and consistent, the granularity is even, the color is pure, the conversion rate is high, and the difficult problems of long synthesis period, low yield and poor consistency of the conventional colorless diamond are effectively solved.

Description

technical field [0001] The invention relates to the technical field of artificial crystal synthesis and crystal color change, in particular to an artificial synthesis method of gem-grade colorless diamonds. technical background [0002] Colorless diamonds are Ⅱa (nitrogen content) diamonds, which are widely used in electronics, aerospace, laser transmitters, diamond jewelry and other fields due to their unique properties. Prospects: The existing known colorless diamonds mainly come from natural diamond mines, and the formation of natural diamonds takes hundreds of millions of years, the output is scarce, and the price is expensive. Long-term mining will cause the depletion of natural diamond resources, and the cost is extremely high. Therefore, there is an urgent need for the research and development of synthetic diamonds. [0003] At present, the methods of synthetic diamonds have been studied, and the methods are mainly CVD and temperature difference method, but the tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/04C30B1/12
CPCC30B1/12C30B29/04
Inventor 邵增明张存升陈正威关博田秀峰
Owner HENAN POWER NEW MATERIAL
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