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Preparation method of CBN (Cubic Boron Nitride) mixing type boron-doped diamond and Fe-based alloy catalyst

A kind of boron diamond, base alloy technology

Active Publication Date: 2018-06-05
崔祥仁 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has high requirements for the purity of raw materials and the uniformity of the mixture, and the difficulty in controlling the production process. Unstable performance such as inertia, which is not conducive to the promotion of use

Method used

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  • Preparation method of CBN (Cubic Boron Nitride) mixing type boron-doped diamond and Fe-based alloy catalyst
  • Preparation method of CBN (Cubic Boron Nitride) mixing type boron-doped diamond and Fe-based alloy catalyst
  • Preparation method of CBN (Cubic Boron Nitride) mixing type boron-doped diamond and Fe-based alloy catalyst

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preparation example Construction

[0041] Compared with the traditional diamond synthesis process, CBN is added to the Fe-based alloy catalyst used in the preparation method of the present invention as the source of B element, compared to the current practice of directly adding boron or ordinary borides in the catalyst as the source of B element in the industry , using the B element in CBN to continuously dissolve and penetrate into graphite, and then transform into boron-containing diamond, the boron element in the obtained boron-containing diamond can be distributed more uniformly and the content is more stable, thereby further improving the heat resistance of boron-containing diamond resistance, oxidation resistance, chemical inertness and other properties. In addition, a certain amount of Mn element is added to the Fe-based alloy catalyst, which can effectively change the nucleation conditions of diamond and be more conducive to nucleation. In a preferred embodiment, the Fe-based alloy catalyst includes: 28...

Embodiment

[0055] The synthesis steps are:

[0056] (1) Get fine graphite powder and Fe-based alloy catalyst powder with 400 meshes, mix by weight ratio 11:9, the composition and content of described Fe-based alloy catalyst powder are recorded as: Ni: 28%, CBN: 3%, Co: 5%, Mn: 3%, the balance is Fe;

[0057] (2) Put the raw material obtained in step (1) into a three-dimensional mixer and mix for 6 hours, and after isostatic pressing at 280Mpa, break it into particles smaller than 100 meshes to obtain the mixed material;

[0058] (3) Put the mixed material obtained in step (2) into the mold, and then press it into a columnar stem on a four-column press. The stem size: Φ55mm×43mm, and the stem density: 3.5g / cm 3 , put the formed core column into a vacuum furnace, vacuum treatment at 1100 ° C, fully remove oxygen and other volatile impurities, and naturally cool down to room temperature;

[0059] (4) Put the core column into the diamond synthesis block, and then put the diamond synthesis ...

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Abstract

The invention provides a preparation method of a CBN (Cubic Boron Nitride) mixing type boron-doped diamond. The preparation method comprises the steps of adopting graphite powder and an Fe-based alloycatalyst are adopted as raw materials, mixing the materials, pressing a core column, synthesizing and the like, wherein during a synthesis process, an improved pressure and temperature curve is adopted. The invention further provides the Fe-based alloy catalyst for preparing the boron-doped diamond. The CBN mixing type boron-doped diamond prepared through the invention is consistent in product crystal form, complete in crystal face, remarkably improved and stable in boron content, uniform in distribution, high in heat punching value, greatly improved in performances such as heat resistance, oxidation resistance and chemical inertness, capable of effectively satisfying the fields of machinery, electronics, spaceflight and military industry with high requirements on diamonds, and capable ofbeing used for manufacturing cutting and grinding tools normally working under various higher temperature and severe environments and high-performance electronic elements.

Description

technical field [0001] The invention relates to the field of artificial diamonds, in particular to a preparation method of a CBN mixed boron-containing diamond and an Fe-based alloy catalyst which can be used for preparing the CBN mixed boron-containing diamond. Background technique [0002] At present, with the continuous progress of synthetic diamond synthesis technology, the quality of synthetic diamond single crystal is getting higher and higher. [0003] As a type IIb diamond, boron-containing diamond is a special type of diamond. Although its boron content is generally very low, it is significant for improving and improving the performance of diamond crystals. The specific performance is as follows: [0004] 1. Higher heat resistance: because boron atoms form a boron-carbon structure when they bond with carbon atoms on the surface of the diamond, there are no excess valence electrons to react with external electron-deficient atoms (such as oxygen atoms), and the diamon...

Claims

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Application Information

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IPC IPC(8): C22C33/02C22C38/08C22C38/04
CPCC22C33/0285C22C38/04C22C38/08C22C2026/003
Inventor 崔祥仁大岛龙司
Owner 崔祥仁
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