Preparing method of green diamond

A technology for green diamond and preparation process, applied in the field of preparation of green diamond, can solve the problems of colorless diamond, small diamond particle size, no complete crystal shape, etc., and achieve the effects of simplifying the process, reducing the production cost and overcoming the complexity.

Inactive Publication Date: 2008-07-23
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary synthetic diamonds are mostly synthesized by metal catalysts and graphite systems. The concentration of nitrogen in diamonds is only about 300ppm, and the color of diamonds appears light yellow or yellow.
So far, foreign literature has reported that the concentration of nitrogen in artificially synthesized diamonds using traditional metal catalysts under high temperature and high pressure conditions can only reach

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A kind of method for preparing green diamond is to take graphite as raw material, lithium nitride (Li 3 N) is an additive, FeNi or NiMnCo alloy as a catalyst, and the specific process is: powder graphite, FeNi or NiMnCo alloy catalyst, Li 3 N additives by graphite: FeNi or NiMnCo: Li 3 N = 1: (0.3 ~ 1): (0.005 ~ 0.025) mass ratio mixed evenly and pre-pressed into a columnar bar into the pyrophyllite synthetic block, the assembled synthetic block into the six-sided top diamond press In the high-temperature and high-pressure chamber, pass current, raise the temperature to 1450-1950K within 0.5-5 minutes, and pressurize at the same time, keep the pressure at 4.0-4.8GPa for 0.5-3 minutes, and then continue to increase the pressure to 5.2- 5.8GPa, heat preservation and pressure for 8 to 20 minutes, and then release the pressure after stopping the heat. After acid treatment to remove impurities, nitrogen-rich diamond crystals with uniform particle size are obtained. The crys...

Embodiment 2

[0027] Another method for preparing green diamond is to use graphite as a raw material and use FeNi or NiMnCo alloy as a catalyst. The mass ratio of graphite and alloy catalyst is: graphite: FeNi or NiMnCo=1: 0.3~1, which is characterized in that Lithium nitride (Li 3 N) additives, graphite and Li 3 The mass ratio of N is: graphite: Li 3 N=1:0.005~0.025, its preparation process is: the powder graphite and Li 3 N is mixed evenly and pre-pressed into 1-3mm thick sheets, which are alternately stacked with the alloy catalyst sheets of the above mass ratio and loaded into the pyrophyllite synthesis block, and the assembled synthesis block is put into the high temperature and high pressure of the six-sided top diamond press In the chamber, pass the current, raise the temperature to 1450-1950K within 0.5-5 minutes, and pressurize at the same time, keep the pressure at 4.0-4.8GPa for 0.5-3 minutes, and then continue to increase the pressure to 5.2-5.8GPa , and then heat preservatio...

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Abstract

The invention relates to a preparation method of a green diamond, which adopts plumbago as the material and FeNi or NiMnCo alloy as the catalyst, the mass ratio of the plumbago and alloy catalyst is that plumbago:FeNi or NiMnCo is equal to 1:0.3-1. The invention is characterized in that Li3N additive is added into the plumbago, and the mass ratio of the plumbago and the Li3N is that plumbago:Li3N is equal to 1:0.005-0.025; the preparation process is that: the powdery plumbago, Li3N and alloy catalyst meeting the mass ratio are mixed evenly, pre-pressed into cylindrical bar stock and then are placed into a pyrophyllite synthesized block; the assembled synthesized block is placed into a high pressure and high temperature chamber of a hexahedral anvil diamond press, then the temperature is raised to 1450-1950K within 0.5-5 minutes and at the same time the block is pressurized at the pressure of 4.0-4.8 GPa, and is kept at this temperature for 0.5-3 minutes; then the pressure is improved to 5.2-5.8 GPa, and is kept at the temperature for 8-20 minutes; then a green diamond crystal can be obtained after the heating process is stopped, the pressure is relieved and the impurities are removed. This method simplifies the technique process, reduces the manufacturing cost and is convenient for being carried out.

Description

technical field [0001] The invention relates to a method for preparing artificial diamond, in particular to a method for preparing green diamond. Background technique [0002] Diamond contains a certain amount of impurity elements, and these impurity elements directly affect the properties of diamond. Some impurity elements can improve certain properties of diamond, for example: phosphorus or boron can improve the optical properties, mechanical properties, electrical properties and thermal properties of diamond, etc., thus affecting the potential of diamond in industrial development and science and technology use. [0003] Nitrogen is the most important impurity element in diamond. The mechanical, optical, thermal and electrical properties of diamond will be changed due to the presence of nitrogen impurities. According to the existence form of boron, nitrogen impurities in diamond and the impurities themselves in the crystal lattice, diamonds are usually divided into four ...

Claims

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Application Information

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IPC IPC(8): B01J3/06C30B29/04
Inventor 梁中翥贾晓鹏梁静秋
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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