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A method for preparing polycrystalline diamond microspheres by hydrothermally synthesizing carbon spheres

A polycrystalline diamond and hydrothermal synthesis technology, which is applied in the preparation/purification of carbon and the process of applying ultra-high pressure, can solve the requirements that it is difficult to meet the requirements of the secondary diamond anvil, the particle size is large, and the artificial polycrystalline Diamond hardness, thermal stability and other issues, to achieve the effect of uniform size, controllable size, and dense block

Active Publication Date: 2019-02-19
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large particle size of synthetic polycrystalline diamond, it is difficult to meet the requirements of diamond for the secondary anvil in the anvil. Moreover, the binder or catalyst contained in traditional synthetic polycrystalline diamond materials seriously affects the performance of synthetic polycrystalline diamond. Hardness, thermal stability

Method used

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  • A method for preparing polycrystalline diamond microspheres by hydrothermally synthesizing carbon spheres
  • A method for preparing polycrystalline diamond microspheres by hydrothermally synthesizing carbon spheres
  • A method for preparing polycrystalline diamond microspheres by hydrothermally synthesizing carbon spheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 0.01mol of glucose and melt it into 100ml of deionized water to make a 0.1mol / L glucose solution, take 16ml of the above solution and put it into a 20ml reaction kettle, tighten and seal the reaction kettle, place it in an oven at room temperature, and the oven heating rate is 200°C / h, 200 ℃ constant temperature for 24 hours, then take out the reaction kettle from the oven, and naturally cool to room temperature. The reaction kettle was opened, the solution in the reaction kettle was removed, the solid product was washed with water and ethanol, centrifuged three times, and then placed in a 60° C. oven for drying for 10 hours to obtain carbon microspheres. X-ray diffraction tests show that the material contains only carbon, such as figure 1 shown; scanning electron microscopy tests showed the material to be uniform carbon microspheres, approximately 10-15 microns in diameter, as in figure 2 shown.

[0029] Put 4g of sodium chloride into a 20ml silicon carbide bal...

Embodiment 2

[0032] Put 3g of sodium chloride into a 20ml silicon carbide ball mill, add silicon carbide grinding balls with a diameter of 5mm, the mass ratio of silicon carbide grinding balls to sodium chloride is 20:1, set the rotation speed to 800 rpm, and stop after 15 minutes of ball milling. 15 minutes, ball milling for 4 hours, to obtain sodium chloride powder

[0033] 0.05 g of carbon microspheres synthesized in Example 1 and 1 g of sodium chloride powder were shaken and mixed, so that the carbon microspheres were evenly distributed in the sodium chloride powder. A certain amount of the above mixture was loaded into a prefabricated mold, and the operation method of Example 1 was repeated to form an assembled block. The assembled block was placed in an oven and kept at 120° C. for 4 hours. Take out the assembly block from the drying box and put it into a high temperature and high pressure device. First, raise the pressure to 20GPa, keep it under this pressure, and raise the temperat...

Embodiment 3

[0035] Take 0.02mol glucose into 100ml deionized water to make 0.2mol / L glucose solution, repeat the operation method of Example 1 to obtain carbon microspheres. X-ray diffraction testing showed that the material contained only carbon; scanning electron microscopy testing showed carbon microspheres ranging in size from 1-5 microns.

[0036]0.05 g of carbon microspheres and 1 g of the sodium chloride powder ball-milled according to Example 2 were shaken and mixed, so that the carbon microspheres were evenly distributed in the sodium chloride powder. Get a certain amount of the above-mentioned mixture and put it into a prefabricated mold. Take a certain amount of the above-mentioned mixture and put it into a prefabricated mold. Repeat the operation method of Example 1 to form an assembly block. Hour. Take out the assembly block from the drying box and put it into a high temperature and high pressure device. First, raise the pressure to 20GPa, keep it under this pressure, and ra...

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Abstract

The invention discloses a method of preparing polycrystalline diamond microspheres by hydro-thermal synthesis of carbon spheres and belongs to the field of material preparation. The method comprises the steps: by taking a 0.1-0.2mol / L glucose solution as a raw material, synthesizing carbon microspheres at constant temperature 2-4 hours in an oven at 200 DEG C by virtue of a hydrothermal method; dispersing the prepared carbon microspheres to ball-milled sodium chloride superfine powder to form a mixture as a raw material, filling a mould with the raw material and performing compression moulding, filling a magnesium oxide pot after demoulding, forming an assembly block with a pressure transmitting medium magnesium oxide, a rhenium tube furnace, a lanthanum chromite ring and an aluminum oxide column, and putting the assembly block in the oven at constant temperature of 120 DEG C in the oven 3-4 hours; and taking out the assembly block and putting the assembly block in a high-temperature high-pressure device, and performing a high-temperature reaction at an ultrahigh pressure to obtain the polycrystalline diamond microspheres. According to the method disclosed by the invention, no catalysts are added, and the obtained diamond microspheres are uniform in size and compact in block, and the Vickers hardness reaches 60-80 GPa.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a method for preparing polycrystalline diamond microspheres by hydrothermally synthesizing carbon spheres. Background technique [0002] Diamond is the hardest substance known in nature. It has excellent compressive strength, wear resistance, thermal conductivity and other properties. It is widely used in materials, industry and military fields. The natural diamond single crystal is used in the diamond anvil device, and the working pressure can reach hundreds of GPa. It is the most important research method in the research of static high pressure. However, because the diamond table in the diamond anvil is generally 30-500 microns, its maximum pressure is limited. In recent years, scholars from Russia, the United States and other countries have tried to put smaller diamond particles in the diamond anvil as a secondary anvil to obtain higher pressure, and have made ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J3/06C01B32/05
CPCB01J3/06B01J2203/0625B01J2203/0655
Inventor 杨斌池方丽王芳彦
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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