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Nano-structured boron-bearing hexagonal diamond polycrystalline superhard composite and preparation method and application thereof

A diamond polycrystalline, nanostructured technology, applied in chemical instruments and methods, technological processes using ultra-high pressure, and methods of chemically changing substances by using atmospheric pressure, etc.

Active Publication Date: 2019-04-05
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Today, little research has been done on high boron content diamond composites, especially boron-hexagonal diamond composites

Method used

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  • Nano-structured boron-bearing hexagonal diamond polycrystalline superhard composite and preparation method and application thereof
  • Nano-structured boron-bearing hexagonal diamond polycrystalline superhard composite and preparation method and application thereof
  • Nano-structured boron-bearing hexagonal diamond polycrystalline superhard composite and preparation method and application thereof

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Experimental program
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Embodiment 1-16

[0050] A nanostructured boron-containing hexagonal diamond polycrystalline superhard composite material, which is prepared by the following preparation method:

[0051] The first step: according to various carbon powders (comprising: nano / micro diamond and amorphous carbon powder) and amorphous boron material according to various chemical ratios of atoms as shown in Table 1, through fully mixing, under different experimental conditions Lower (2-5×10 -5 Pa), carry out vacuum heat treatment for 30-60min.

[0052] The second step: the initial material powder after vacuum heat treatment is placed in such as figure 2 On the two-stage pressurization experimental device based on the hinged domestic hexagonal press shown, corresponding to the data in Table 2, through the regulation of pressure, temperature, sintering / reaction time, to prepare nanostructured boron-containing hexagonal diamond polymer crystal superhard composite material.

[0053] The hardness of each sample was tes...

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Abstract

The invention relates to a nano-structured boron-bearing hexagonal diamond polycrystalline superhard composite and a preparation method and application thereof, and belongs to the field of superhard materials. The preparation method of the nano-structured boron-bearing hexagonal diamond polycrystalline superhard composite includes: mixing well carbon powder having different crystal structures andan amorphous boron powder initial material, subjecting the mixture to vacuum thermal treatment, adding the initial material subjected to vacuum treatment into a high-temperature high-pressure chamber,and carrying out solid-phase reaction / sintering under the pressure of 21-27 GPa and the temperature of 1000-1600 DEG C. The nano-structured boron-bearing hexagonal diamond polycrystalline superhard composite formed under high temperature and high pressure may form tightly-combined high-strength D-D and B-C chemical bonds between grains, and accordingly, has excellent mechanical properties / hardness, high thermal stability, and good heat conductivity, electrical conductivity / electrical properties; therefore, the composite herein is effectively applicable to electrical devices, tool materials and anvil materials.

Description

technical field [0001] The invention relates to the field of superhard materials, and in particular to a nanostructured boron-containing hexagonal diamond polycrystalline superhard composite material and a preparation method and application thereof. Background technique [0002] Compared with ordinary diamond, boron-containing diamond has the advantages of strong oxidation resistance, good heat resistance, good chemical inertness, excellent electrical properties, low dielectric constant, and good thermal conductivity. Compared with polycrystalline cubic diamond, polycrystalline hexagonal diamond has more excellent mechanical hardness, thermodynamic stability and strength. Boron-containing polycrystalline hexagonal diamond, because of its excellent stability, mechanical and electrical properties, can work at higher temperatures and harsh environments, and is used in tool materials, electronic components, and high-temperature and high-pressure anvil materials. At present, the...

Claims

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Application Information

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IPC IPC(8): C04B35/52C04B35/583C04B35/622B01J3/06
CPCB01J3/062B01J3/065B01J2203/0605B01J2203/0625C04B35/52C04B35/583C04B35/622
Inventor 邹永涛赵予生王培王善民王李平
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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