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Method for preparing carbon source used for synthesis of IIa type diamonds

A technology of carbon source and diamond, which is applied in the processing field of diamond synthetic raw materials, can solve the problems affecting the quality of synthetic type IIa diamonds and unstable carbon source quality, and achieve the effects of reduced nitrogen content, smooth surface and uniform carburization

Active Publication Date: 2017-11-03
ZHONGNAN DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One of purpose of the present invention is to provide a kind of preparation method that is used for the carbon source of IIa type diamond synthesis in view of the above-mentioned deficiencies, in order to solve the unstable quality of the carbon source used in the synthesis of IIa type diamond in the prior art, which affects the final synthesis of IIa Technical issues such as the quality of diamonds

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Present embodiment is a kind of preparation method for the carbon source of IIa type diamond synthesis, and this method comprises the following steps, preferably operates according to the order from top to bottom:

[0015] Step 1, mixing high-purity graphite with a graphite content of more than 99.9% and diamond micropowder in a ratio of 1999:1, and pressing them into shape by a press;

[0016] Step 2. Put the mixture obtained in the previous step into a vacuum sintering furnace for continuous sintering. The sintering temperature in this step is 1050° C., and the holding time is 17 hours;

[0017] Step 3. The mixture after the sintering in the previous step is sintered for the second time in a vacuum sintering furnace. The sintering temperature in this step is 850° C., and the holding time is 12 hours;

[0018] Step 4. The mixture after the sintering in the previous step is sintered for the third time in a vacuum sintering furnace. The sintering temperature in this step...

Embodiment 2

[0022] Present embodiment is also a kind of preparation method for the carbon source of type IIa diamond synthesis, and the method comprises the following steps, preferably operated in order from top to bottom:

[0023] Step 1. Mix high-purity graphite with a graphite content of more than 99.9% and diamond micropowder at a ratio of 1999.9:0.1. The mixing method is to use a mixer to mix the mixture of high-purity graphite and diamond micropowder for 13 hours, and use a four-column press. The machine presses the mixture into shape;

[0024] Step 2. Put the mixture obtained in the previous step into a vacuum sintering furnace for continuous sintering. The sintering temperature in this step is 1150° C., and the holding time is 13 hours;

[0025] Step 3. The mixture after the sintering in the previous step is sintered for the second time in a vacuum sintering furnace. The sintering temperature in this step is 950° C., and the holding time is 8 hours;

[0026] Step 4. The mixture a...

Embodiment 3

[0030] The present embodiment is still a kind of preparation method for the carbon source of type IIa diamond synthesis, and the method comprises the following steps, preferably according to the order from top to bottom:

[0031] Step 1. Mix high-purity graphite with a graphite content of more than 99.9% and diamond micropowder at a ratio of 1999.5:0.5. The mixing method is to use a mixer to mix the mixture of high-purity graphite and diamond micropowder for 17 hours, and use a four-column press. The machine presses the mixture into shape;

[0032] Step 2. Put the mixture obtained in the previous step into a vacuum sintering furnace for continuous sintering. The sintering temperature in this step is 1100° C., and the holding time is 15 hours;

[0033] Step 3. The mixture after the sintering in the previous step is sintered for the second time in a vacuum sintering furnace. The sintering temperature in this step is 900° C., and the holding time is 10 hours;

[0034] Step 4. Th...

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Abstract

The invention discloses a method for preparing a carbon source used for synthesis of IIa type diamonds and belongs to a processing method for diamond synthesis raw materials. The method comprises the following steps: A, mixing high purity graphite with the graphite content of 99.9% or higher and diamond micro-powder together according to a ratio of (1999-1999.9):(0.1-1), and performing compression molding by using a press; B, continuously sintering the mixture obtained in the previous step for three times, wherein the primary sintering temperature is 1050-1150 DEG C, the secondary sintering temperature is 850-950 DEG C, and the tertiary sintering temperature is 750-850 DEG C. The high purity graphite with the graphite content of 99.9% or higher is mixed with the diamond micro-powder, and the mixture is subjected to three-time sintering and purification, so that the consistency and reliability of the finished carbon source are obviously improved. Moreover, the nitrogen content of the carbon source is effectively reduced, the color grade of the product is effectively improved, carburization is uniform during synthesis of IIa type diamonds, and the diamond growth surface is even.

Description

technical field [0001] The present invention relates to a kind of processing method of diamond synthesis raw material, more specifically, the present invention mainly relates to a kind of preparation method of the carbon source that is used for IIa type diamond synthesis. Background technique [0002] At present, large-grain artificial diamonds have entered the field of jewelry. Large-grain colorless diamonds (Type IIa) for jewelry have great market space and prospects. In recent years, the synthesis technology of Type IIa diamonds at home and abroad has developed rapidly, and many enterprises have industrial The technical basis for the production of type IIa diamonds, the method used is the temperature gradient method. As a key component of the synthesis of type IIa diamonds by the temperature gradient method, the carbon source plays a vital role in the quality stability. Therefore, it is necessary to study and improve the processing method of the carbon source used in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/52C04B35/64
CPCC04B35/522C04B35/64C04B2235/661
Inventor 刘乾坤
Owner ZHONGNAN DIAMOND CO LTD
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