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Phase-pure large-scale polycrystalline diamond and its synthesis method and application

A polycrystalline diamond and synthesis method technology, applied in the field of ultra-high pressure synthesis of superhard materials, can solve the problems of inconvenient large-scale industrial production, easy scratching of sharp edges, and incomplete transformation, so as to reduce temperature, pressure and reaction The effect of saving time, reducing production costs, and saving manpower and material resources

Active Publication Date: 2021-02-02
ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, under the action of grinding force, the single crystal synthesized by the catalyst method is easy to be brittle along the dissociation surface, and the sharp cutting edge formed is easy to scratch the surface of the workpiece, while the polycrystalline diamond synthesized by adding a binder has better performance. There are great differences, such as polycrystalline diamond synthesized by adding a binder to diamond micropowder, and the binder has a great influence on the mechanical properties such as hardness and strength of polycrystalline diamond, as well as heat resistance and wear resistance. ; If pure graphite is used to directly synthesize polycrystalline diamond, due to the high requirements for the purity of raw material graphite, impurity phases such as black graphite are prone to appear in the synthesized polycrystalline diamond, that is, it cannot be completely transformed during the transformation process, or the complete transformation needs to be relatively complicated synthetic conditions, which invisibly increases the production cost in production, and is not convenient for large-scale industrial production

Method used

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  • Phase-pure large-scale polycrystalline diamond and its synthesis method and application
  • Phase-pure large-scale polycrystalline diamond and its synthesis method and application
  • Phase-pure large-scale polycrystalline diamond and its synthesis method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Take 100g of 0.5 ~ 1μm diamond powder, at 1000℃, 10 -3 Heating in a MPa vacuum furnace for 3 hours, cooling with nitrogen / argon protection, preparing diamond micropowder with a graphitized surface and a graphitized mass ratio of 3%, and compressing the graphitized diamond powder under a pressure of 10-30MPa The density is 2.0~2.5g / cm 3 The cylinder, and then at 700 ° C, 10 -3 Heating in a MPa vacuum furnace for 2 hours, cooling with nitrogen / argon protection, taking out the cylinder on a six-sided top press at 1900°C and 10GPa pressure, pressurizing for 1.5h, taking out the corresponding product and heating it with concentrated sulfuric acid at 250°C After reacting for 1-3 hours, filter and wash the filter residue to obtain pure-phase large-scale polycrystalline diamond.

Embodiment 2

[0032] Take 100g of 1~2μm diamond micropowder, at 1200℃, 10 -4 Heating in a MPa vacuum furnace for 4 hours, cooling with nitrogen / argon protection, preparing diamond micropowder with a graphitized surface and a graphitized mass ratio of 20%, and compressing the graphitized diamond powder under a pressure of 10-30MPa The density is 2.0~2.5g / cm 3 The cylinder, and then at 700 ° C, 10 -3 Heating in a vacuum furnace of MPa for 2 hours, cooling with nitrogen / argon protection, taking out the cylinder and putting it on a six-sided top press at 2000°C and 12GPa pressure for 2 hours, then taking out the corresponding product and heating it with concentrated sulfuric acid at 280°C to react After 1-3 hours, filter and wash the filter residue to obtain pure-phase large-scale polycrystalline diamond.

Embodiment 3

[0034] Take 100g of 5-10μm diamond micropowder, -5Heating in MPa vacuum furnace for 5h, cooling with nitrogen / argon protection, preparing diamond micropowder with surface graphitization and graphitization mass ratio of 40%, and compressing the surface graphitized diamond micropowder under a pressure of 10-30MPa The density is 2.0~2.5g / cm 3 The cylinder, and then at 700 ° C, 10 -3 Heating in a vacuum furnace of MPa for 2 hours, cooling with nitrogen / argon protection, taking out the cylinder and putting it on a six-sided top press at 2200°C and 15GPa pressure for 3 hours, taking out the corresponding product and heating it with concentrated sulfuric acid at 290°C to react After 1-3 hours, filter and wash the filter residue to obtain pure-phase large-scale polycrystalline diamond.

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Abstract

The invention belongs to the technical field of ultra-high pressure synthesis of superhard materials, and in particular relates to a method and application for synthesizing pure-phase large-scale polycrystalline diamond from graphitized diamond. The present invention uses surface graphitized diamond to replace graphite in the prior art to synthesize pure-phase large-scale polycrystalline diamond, without any additives under high temperature and high pressure conditions, and directly converts surface graphitized diamond as a raw material. Compared with the polycrystalline diamond directly converted from graphite, the polycrystalline diamond prepared by the synthesis method of the present invention not only reduces the synthesis temperature, pressure and reaction time, but also can be produced continuously, thus greatly reducing the production cost and saving manpower and material resources.

Description

technical field [0001] The invention belongs to the technical field of ultra-high pressure synthesis of superhard materials, in particular to the synthesis and application of pure-phase large-scale polycrystalline diamond. Background technique [0002] In the prior art, in the field of static ultra-high pressure technology, the synthesis of diamond mostly adopts the method of adding graphite and catalyst to synthesize diamond under high pressure; there are also direct conversion and synthesis of polycrystalline diamond under ultra-high pressure and high temperature synthesis conditions without adding catalyst, or Polycrystalline diamond is prepared by adding binder / sintering aid to diamond powder. Among them, under the action of grinding force, the single crystal synthesized by the catalyst method is easy to be brittle along the dissociation surface, and the sharp cutting edge formed is easy to scratch the surface of the workpiece, while the polycrystalline diamond synthesiz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J3/06
CPCB01J3/062B01J2203/0655
Inventor 张相法位星王永凯薛磊刘红伟
Owner ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES