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Preparation process of graphite column for diamond synthesis

A preparation process, graphite column technology, applied in the application of ultra-high pressure process, manufacturing tools, material molding presses, etc., can solve the problem that the density of graphite columns will not increase, and achieve single crystal growth with good quality and concentrated particle size The effect of high density and high crystal yield

Active Publication Date: 2021-06-01
ZHENGZHOU SINO CRYSTAL DIAMOND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]At present, the usual way to increase the compression density of graphite columns is to increase the compression pressure, but the compression on the four-column press belongs to the mutual extrusion between particles, which will not produce the second phase of physical The essence of the change is the plastic deformation of the powder particles and the compression of the gaps between the particles. With the further increase

Method used

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  • Preparation process of graphite column for diamond synthesis
  • Preparation process of graphite column for diamond synthesis
  • Preparation process of graphite column for diamond synthesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Metal powder and graphite powder press the graphite column according to the formula of 5:5, and weigh -200 mesh FeNi 3050kg of metal powder, 49kg of high-purity scaly graphite powder with a fineness of 300 mesh or more, and 1kg of nucleating agent for standby. First, add 50kg of metal powder and 1kg of nucleating agent into a 200L three-dimensional mixer, adjust the speed of the mixer to 70r / min, mix for 1.5 hours, add 0.6kg of dispersant solution, mix for 3 hours and then add Graphite powder and the dispersant of 1kg, then continue to mix 3 hours in the mixer. After the mixing is completed, transfer to the double-roll extruder for granulation as soon as possible. The finishing time cannot exceed 1 hour. The speed of the double-roll extruder is set at 1500r / min, and the material is repeatedly granulated twice. Afterwards, the granulated material was pressed and formed on a 150-ton four-column press, the diameter of the mold cavity was 70.8mm, and the weight of the grap...

Embodiment 2

[0036] The difference between this embodiment and Implementation 1 is the difference in the mixing method. In order to compare the technical effects of the conventional mixing method and the graded mixing method of the present invention, this embodiment is designed as a conventional graphite column mixing process. The specific process The process is:

[0037] Press the metal powder and graphite powder into the graphite column according to the formula of 5:5, and first weigh the FeNi finer than 200 mesh 30 50kg of metal powder, 49kg of fine high-purity scaly graphite powder with a size of 300 mesh, and 1kg of nucleating agent for spare use. Add the metal powder, graphite powder, nucleating agent and 1.6kg of dispersant weighed above into the three-dimensional mixer at the same time , the mixing time is set to 8 hours, the speed of the mixer is set to 70r / min, after the mixing is completed, the material is loaded into the silo of the granulator, the speed of the granulator is se...

Embodiment 3

[0039] The difference between this embodiment and Implementation 1 lies in the difference in the pressing method. In order to compare the technical effects of the conventional pressing method and the reheating and repressing method of the present invention, this embodiment is designed as a conventional graphite column pressing process, and the specific process is as follows: :

[0040] Press the metal powder and graphite powder into the graphite column according to the formula of 5:5, first weigh 50kg of FeNi30 metal powder with a size of 200 mesh or finer, 49kg of high-purity scaly graphite powder with a finer size of 300 mesh or smaller, and 1kg of nucleating agent for later use. First, add 50kg of metal powder and 1kg of nucleating agent into a 200L three-dimensional mixer, adjust the speed of the mixer to 70r / min, mix for 1.5 hours, add 0.6kg of dispersant solution, mix for 3 hours and then add Graphite powder and the dispersant of 1kg, then continue to mix 3 hours in the ...

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Abstract

The invention belongs to the field of diamond synthesis, and particularly relates to a preparation process of a graphite column for diamond synthesis. The process comprises the following steps: firstly, adding a nucleating agent and metal powder into a mixer, adding a dispersing agent in the mixing process, continuously mixing, then adding graphite powder and the dispersing agent, continuously mixing, granulating the mixed material twice, then conducting primary compression molding, heating on a medium-frequency heating machine after molding, rapidly carrying out secondary compression molding, repeatedly carrying out reheating and repressing on the graphite column, and finally carrying out microwave reduction treatment on the graphite column. For the requirements of synthesis of a large-cavity industrial diamond on a high density of the graphite column, the graphite column is sintered, reheated and repressed, meanwhile, the segregation effect of the reheating and repressing process on a nucleating agent in the graphite column is considered, the mixing process of the graphite column is improved, the per unit yield and the superior crystal of the synthesized large-cavity industrial diamond are remarkably improved through the prepared product, the synthesis pressure can be reduced, the hammer consumption can be reduced, and the single-machine synthesis benefit can be remarkably improved.

Description

technical field [0001] The invention belongs to the field of diamond synthesis, and in particular relates to a preparation process of a graphite column for diamond synthesis. Background technique [0002] The method used for synthetic diamond synthesis is mainly static pressure catalyst method, that is, graphite and catalyst are made into graphite column, and graphite is converted into diamond under the environment of 5-6GPa, 1200-1500℃, and the catalytic effect of metal catalyst. . Normally, after the bore design of the six-sided top press is determined, the design of the top hammer is completed, and the stroke of the top hammer is also determined at this time. The equipment is completed from the primary overpressure to the secondary overpressure. 3mm, if the pressure continues to increase in the synthetic test, the anvil will continue to move forward. When it exceeds the safe travel range, it will cause the hammer to be squeezed or the seal loss will be too high, and the ...

Claims

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Application Information

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IPC IPC(8): B30B11/00B30B15/34B30B1/34B01J3/06
CPCB30B11/004B30B11/005B30B15/34B30B1/34B01J3/065B01J3/062
Inventor 李盟张建华苏崇姜豪崔雪伟
Owner ZHENGZHOU SINO CRYSTAL DIAMOND
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