Process for synthesizing diamond

A synthesis process, diamond technology, applied in the application of ultra-high pressure process, etc., can solve the problems of irregular crystal shape, low efficiency, time-consuming, etc., achieve the effect of complete and regular crystal, avoid more nucleation, and improve extraction rate

Active Publication Date: 2010-10-20
ZHENGZHOU ARTIFICIAL DIAMOND & PROD ENG TECH RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above process has the defects of low diamond output, irregular crystal shape, low efficiency,

Method used

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  • Process for synthesizing diamond
  • Process for synthesizing diamond
  • Process for synthesizing diamond

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1:

[0020] Diamond synthesis process, the steps are: (1) Put the synthetic block of pyrophyllite into the high-pressure chamber of the six-sided press, and push the six pistons of the six-sided press forward under the action of the booster pump to make the six-sided press The six cemented carbide tops of the press are filled with liquid and pressurized. After the pressure reaches 4MPa, the six-sided top press is connected to the overpressure to 55MPa. During the process of increasing from normal pressure to 55MPa, the pressure increase speed is controlled at 1Mpa / s; Press for 4 minutes, then pressurize to a synthesis pressure of 70MPa in 15 seconds, in order to fully melt the graphite column (graphite powder and metal catalyst powder) in the synthesis cavity of the pyrophyllite synthesis block, so that the graphite is fully converted; During the pressurization process, start heating when the pressure is 35MPa, so as to prevent the pyrophyllite from being unable...

Example Embodiment

[0021] Example 2:

[0022] Diamond synthesis process, the steps are: (1) Put the synthetic block of pyrophyllite into the high-pressure chamber of the six-sided press, and push the six pistons of the six-sided press forward under the action of the booster pump to make the six-sided press The six tungsten carbide tops of the press are filled with liquid and pressurized. After reaching the pressure of 5MPa, the six-sided top press is connected to overpressure to 59MPa, and the pressure increase speed is controlled to 0.5Mpa / s during the process of increasing from normal pressure to 59MPa; Hold the pressure for 6 minutes, then pressurize to a synthesis pressure of 75MPa in 18 seconds, in order to fully melt the graphite column (graphite powder and metal catalyst powder) in the synthesis cavity of the pyrophyllite synthesis block, so that the graphite is fully converted; from normal pressure to 75MPa During the supercharging process, the heating starts when the pressure is 38MPa, ...

Example Embodiment

[0023] Example 3:

[0024] Diamond synthesis process, the steps are: (1) Put the synthetic block of pyrophyllite into the high-pressure chamber of the six-sided press, and push the six pistons of the six-sided press forward under the action of the booster pump to make the six-sided press The six cemented carbide tops of the press are filled with liquid and pressurized. After the pressure reaches 6MPa, the six-sided top press is connected to overpressure to 65MPa, and the pressure increase speed is controlled to 0.1Mpa / s during the process of increasing from normal pressure to 65MPa; Hold the pressure for 8 minutes, then pressurize to a synthesis pressure of 80MPa in 20 seconds, in order to fully melt the graphite column (graphite powder and metal catalyst powder) in the synthesis cavity of the pyrophyllite synthesis block, so that the graphite is fully converted; increase from normal pressure to 80MPa When the pressure is 40MPa during the pressurization process, start heating ...

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Abstract

The invention belongs to the technical field of diamond synthesis and relates to a process for synthesizing diamond by adopting a special hexahedron press. The process has the steps as follows: (1) placing synthesized blocks in a high pressure cavity of the hexahedron press, pressurizing, connecting with overpressure to 55-65MPa after the pressure reaches 4-6MPa, preserving the pressure for 4-8min, and increasing the pressure to 70-80MPa after 15-20s; (2) preserving the pressure for 1-3min; (3) continuously increasing the pressure at the speed of 0.01-0.03MPa/s; and (4) preserving the pressure and cooling when the pressure is increased to 85-95MPa, and releasing the pressure to normal temperature when the temperature is reduced to the room temperature. The diamond product manufactured by the process for synthesizing the diamond has complete and regular crystals and golden color, and the process with short synthesis time and high extraction ratio can be used for grow the diamond products with the same particle size.

Description

technical field [0001] The invention belongs to the technical field of diamond synthesis, and relates to a process for synthesizing diamond by using a six-sided top press. Background technique [0002] The static pressure catalyst method is mainly used in China to synthesize diamond by six-sided top press. The static pressure catalyst method refers to the method of synthesizing diamond under the condition of constant ultra-high temperature and high pressure and the participation of catalyst under the condition of diamond thermodynamic stability. The static pressure catalyst method uses graphite as raw material, transition metal or alloy as catalyst, a hydraulic press to generate constant high pressure, and DC or AC to generate continuous high temperature to convert graphite into diamond. The conversion conditions are generally 5-7Gpa, 1300-1700°C. The technical parameters of the synthesis process of the six-sided top press synthetic diamond mainly refer to three parameters...

Claims

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Application Information

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IPC IPC(8): B01J3/06
Inventor 薛胜辉王蕊蕊彭献伟刘广利
Owner ZHENGZHOU ARTIFICIAL DIAMOND & PROD ENG TECH RES CENT
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