Method of preparing polycrystalline diamond microspheres by hydro-thermal synthesis of carbon spheres

A technology of polycrystalline diamond and hydrothermal synthesis, applied in the direction of carbon preparation/purification, application of ultra-high pressure process, etc., can solve the problem that it is difficult to meet the requirements of the diamond secondary anvil and affect the hardness and heat of artificial polycrystalline diamond. Stability, large particle size and other issues, to achieve the effect of uniform size, compact block, and controllable size

Active Publication Date: 2017-04-26
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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  • Method of preparing polycrystalline diamond microspheres by hydro-thermal synthesis of carbon spheres
  • Method of preparing polycrystalline diamond microspheres by hydro-thermal synthesis of carbon spheres
  • Method of preparing polycrystalline diamond microspheres by hydro-thermal synthesis of carbon spheres

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Take 0.01mol of glucose and dissolve 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 reactor. Tighten and seal the reactor. Keep the temperature at 200°C for 24 hours, then take out the reaction kettle from the oven, and let it cool down to room temperature naturally. Open the reaction kettle, remove the solution in the reaction kettle, wash the solid product with water and ethanol, centrifuge three times, put it in a 60°C oven and dry it 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 test shows that the material is uniform carbon microspheres with a diameter of about 10‐15 microns, such as figure 2 shown.

[0029] Put 4g of sodium chloride into a silicon carbide ball mill tank with a capacity of 20ml, add silicon carbide grinding balls with a diameter of 5mm, the mass ratio...

Embodiment 2

[0032] Put 3g of sodium chloride into a 20ml silicon carbide ball mill tank, 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 speed at 800 rpm, and pause after 15 minutes of ball milling 15 minutes, accumulative ball milling for 4 hours, to obtain sodium chloride powder

[0033] Mix 0.05 g of carbon microspheres synthesized in Example 1 with 1 g of sodium chloride powder by shaking, so that the carbon microspheres are evenly distributed in the sodium chloride powder. 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, put the assembly block into an oven, and keep the temperature at 120° C. for 4 hours. Take out the assembly block from the drying oven and put it into a high-temperature and high-pressure device. First, raise the pressure to 20GPa, keep it under this pressure, and ...

Embodiment 3

[0035] Take 0.02 mol of glucose and dissolve it into 100 ml of deionized water to form a 0.2 mol / L glucose solution, and repeat the operation method of Example 1 to obtain carbon microspheres. X-ray diffraction tests show that the material contains only carbon; scanning electron microscope tests show that the size of carbon microspheres is 1‐5 microns.

[0036]0.05 g of carbon microspheres and 1 g of sodium chloride powder milled according to Example 2 were shaken and mixed, so that the carbon microspheres were uniformly distributed in the sodium chloride powder. Take 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, and repeat the operation method of Example 1 to form an assembly block. Hour. Take out the assembly block from the drying oven and put it into a high-temperature and high-pressure device. First, raise the pressure to 20GPa, keep it under ...

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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, which is the most important research method in the current static high pressure research. However, since the diamond table in the diamond anvil is generally 30-500 microns, the 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 counter-anvil as a secondary anvil to obtain higher pressure, ...

Claims

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Application Information

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Patent Type & Authority Applications(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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