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Method for preparing high-performance polycrystalline diamond by utilizing hinge-type cubic press

A technology of polycrystalline diamond and six-sided pressing machine, which is applied in the process of applying ultra-high pressure, etc., can solve the problem of large particle size, affecting hardness, wear resistance, thermal stability, and difficulty in achieving ultra-fine cutting tool edges Problems such as flatness and sharpness, to achieve the effect of reducing costs

Active Publication Date: 2013-10-02
SICHUAN UNIV
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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 diamond polycrystalline materials, it is difficult to achieve the flatness and sharpness of the cutting edge for ultra-fine cutting tools
More importantly, the binders contained in traditional artificial poly(poly)crystalline diamond materials, such as: Co, Ni, etc., seriously affect the hardness, wear resistance, and thermal stability of synthetic diamond poly(poly)crystalline sintered materials.
[0004] Directly use diamond powder or carbon containing part of diamond as raw material to prepare high-performance polycrystalline diamond under high temperature and ultra-high pressure in a hinged six-sided top press. There are no reports in patent literature or non-patent literature.

Method used

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  • Method for preparing high-performance polycrystalline diamond by utilizing hinge-type cubic press
  • Method for preparing high-performance polycrystalline diamond by utilizing hinge-type cubic press
  • Method for preparing high-performance polycrystalline diamond by utilizing hinge-type cubic press

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Commercially available diamond powder with an average particle size of 10-20nm prepared by the detonation method is treated with hydrofluoric acid with a concentration of 20%-40%. The ratio of hydrofluoric acid to diamond powder is 2:1 by weight, add it to the purification kettle, stir and heat it to 70°C in a water bath, and treat it for 72 hours. After the powder settles, pour off the liquid and wash it with deionized water to medium properties, then put the above diamond powder in hydrochloric acid with a concentration of 20%-38%, the ratio of hydrochloric acid to diamond powder is 2:1 by weight, add it to the purification kettle, stir and heat it to 70°C in a water bath, and process After 72 hours, after the powder settles, pour off the liquid and wash it with deionized water to neutrality. After repeating the above acid solution and impurity removal for 3-5 times, dry the diamond powder; then dry the diamond powder in a vacuum of 4x10 -3 Pa, the temperature is 800°...

Embodiment 2

[0046]Commercially available diamond powder with an average particle size of 100-200nm prepared by the detonation method is treated with hydrofluoric acid at a concentration of 20%-40%. Add hydrofluoric acid to diamond powder in a weight ratio of 2:1, add it to the purification kettle, stir and heat it to 70°C in a water bath, and treat it for 72 hours. After the powder settles, pour off the liquid and wash it with deionized water until Neutral, then put the above diamond powder in nitric acid with a concentration of 20%-30%, the ratio of nitric acid to diamond powder is 2:1 by weight, add it to the purification kettle, stir and heat in a water bath to 70°C , treated for 72 hours, after the powder settles, pour off the liquid, and wash with deionized water to neutrality, repeat the above acid dissolution and impurity removal for 3-5 times, then dry the diamond powder; then put the diamond powder in a vacuum 4x10 -4 Pa, the temperature is 1000°C, and the treatment is for 3 hou...

Embodiment 3

[0048] The diamond powder with an average particle size of 0-2 μm prepared by crushing large-grain diamonds is treated with hydrofluoric acid with a concentration of 20%-40%. Add hydrofluoric acid to diamond powder in a weight ratio of 2:1, add it to the purification kettle, stir and heat it to 70°C in a water bath, and treat it for 72 hours. After the powder settles, pour off the liquid and wash it with deionized water until Neutral, then put the above diamond powder in nitric acid with a concentration of 20%-30%, the ratio of nitric acid to diamond powder is 2:1 by weight, add it to the purification kettle, stir and heat in a water bath to 70°C , treated for 72 hours, after the powder settles, pour off the liquid, and wash with deionized water to neutrality, repeat the above acid dissolution and impurity removal for 3-5 times, then dry the diamond powder; then put the diamond powder in a vacuum 4x10 -5 Pa, the temperature is 1200°C, and the treatment is for 2 hours to remov...

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Abstract

The invention discloses a method for preparing high-performance polycrystalline diamond by utilizing a hinge-type cubic press. The method is characterized in that diamond or diamond-containing carbon powder are taken as raw materials, and any metal or ceramic binder is not added. After purification, the powder surfaces are purified for 0.5 h-5 h at a vacuum degree of 4*10<-3>-4*10<-5> Pa, at the temperature of 800-1500 DEG C. The diamond powder with purified surfaces is pre-formed, placed on the hinge-type cubic press, sintered for 1-30 min at the temperature of 1400-2500 DEG C, under the pressure of 8-20 GPa to prepare high-performance polycrystalline diamond block materials. The high-performance polycrystalline diamond is single in phase, chemical bonds are formed among crystal grains, and integrated closely on a large scale to form high-strength diamond- diamond interfaces. The high-performance polycrystalline diamond is almost the same as natural diamond monocrystalline in hardness, and is better than binder-containing artificial polycrystalline diamond in heat stability and hardness.

Description

technical field [0001] The invention relates to a method for preparing high-performance polycrystalline diamond by using a hinged six-sided top press, belonging to the field of preparation of inorganic materials. technical background [0002] Diamond is the hardest substance known in nature. It has excellent performance in terms of wear resistance, compressive strength, heat dissipation rate, and sound transmission rate. It is widely used in industrial and military fields. Natural diamond single crystal was first used in the field of cutting. Its uniform crystal structure without internal grain boundaries enables the cutting edge of natural diamond single crystal tool to theoretically achieve atomic-level flatness and sharpness. It has strong thinning ability and high precision during cutting. Cutting force is small. Its extremely high hardness and wear resistance, corrosion resistance and chemical stability make natural diamond tools have a long life, ensure long-lasting n...

Claims

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Application Information

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IPC IPC(8): B01J3/06
Inventor 贺端威许超王海阔
Owner SICHUAN UNIV
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