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A kind of doped nano polycrystalline diamond and preparation method thereof

A technology of polycrystalline diamond and diamond powder, which is applied in the field of doped nano-polycrystalline diamond and its preparation, and can solve the problems of low hardness, reducing the sintering temperature and pressure of diamond sintered blocks, etc.

Active Publication Date: 2021-11-30
FUNIK ULTRAHARD MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By doping boron in the diamond, the sintering temperature and pressure of the diamond sintered block are reduced, and the fracture toughness of the boron-doped diamond made of micron-sized diamond raw materials is 1.3 times that of the diamond sintered block with cobalt as the binder. times, and its performance is still relatively stable after heat treatment at 1000°C, but its hardness is low, only reaching about 76GPa

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The preparation method of the doped nano-polycrystalline diamond of the present embodiment specifically includes the following steps: dispersing solid boron oxide (with a particle size of 50 to 100 nm) in ethanol to obtain a dispersion of boron oxide; using high-energy ball milling (the speed of ball milling is 80r / min, the time is 12h) mix the dispersion of boron oxide and diamond powder (particle size: 50-100nm) evenly, and then dry at 40°C to obtain a mixture of boron oxide and diamond powder (boron oxide in the mixture The volume fraction is 0.05%); the mixture is placed in a mold and pre-pressed to obtain a blank, and the blank is assembled and sintered at 12GPa and 2000°C for 20min to obtain boron-doped nano-polycrystalline diamond.

Embodiment 2

[0022] The preparation method of the doped nano-polycrystalline diamond of the present embodiment specifically includes the following steps: dispersing solid boron oxide (with a particle size of 50 to 100 nm) in ethanol to obtain a dispersion of boron oxide; using high-energy ball milling (the speed of ball milling is 100r / min, time 10h) mix the boron oxide dispersion with diamond powder (particle size 50-100nm) evenly, and then dry at 40°C to obtain a mixture of boron oxide and diamond powder (the boron oxide in the mixture The volume fraction is 0.5%); the mixture is placed in a mold and pre-pressed to obtain a blank, and after the blank is assembled, it is sintered at 13GPa and 2200°C for 20min to obtain boron-doped nano-polycrystalline diamond.

Embodiment 3

[0024] The preparation method of the doped nano-polycrystalline diamond of the present embodiment specifically comprises the following steps: the solid-state B 6 Disperse O (particle size 50-100nm) in ethanol to obtain B 6 The dispersion of O; adopt high-energy ball milling (the speed of ball milling is 120r / min, and the time is 12h) to make B 6 The dispersion of O and diamond powder (particle size is 50 ~ 100nm) are uniformly mixed, and then dried at 40°C to obtain a mixture of boron oxide and diamond powder (the volume fraction of boron oxide in the mixture is 1%); the mixture Place in a mold to pre-press the blank, assemble the blank and sinter at 15GPa and 1800°C for 25min to obtain boron-doped nano-polycrystalline diamond.

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Abstract

The invention belongs to the technical field of superhard materials, in particular to a doped nanometer polycrystalline diamond and a preparation method thereof. The preparation method of the doped nano-polycrystalline diamond of the present invention comprises the following steps: sintering the raw materials under the conditions of 10-15GPa and 1800-2300° C.; the raw materials are diamond powder and boron source, and the particle size of the diamond powder is 50~100nm, the volume fraction of the boron source in the raw material is 0.05~1%. In the invention, nanometer-scale diamond powder is used as raw material, and boron source and diamond powder are sintered under high temperature and high pressure to obtain boron-doped nanometer polycrystalline diamond. The obtained boron-doped nano-polycrystalline diamond has a hardness of more than 100 GPa, high thermal stability and wear resistance at high temperatures, and has wide application prospects in the ultra-high-speed, high-efficiency, and high-precision cutting fields.

Description

technical field [0001] The invention belongs to the technical field of superhard materials, and in particular relates to a doped nano polycrystalline diamond and a preparation method thereof. Background technique [0002] Polycrystalline diamond has a wide range of applications as a superhard material, and is often used in oil and gas drilling, cutting tools, wear-resistant materials and other fields. Polycrystalline diamond containing binders or sintering aids is widely used in industrial production due to the relatively low synthesis conditions (about 5-6GPa, 1600°C). However, the presence of binders and sintering aids will weaken the performance of polycrystalline diamond. Therefore, it is necessary to find a method that can meet the low requirements on the synthesis conditions and ensure the excellent performance of the obtained polycrystalline diamond. [0003] Boron is a common impurity element in natural diamond, and doping boron in artificial diamond can improve th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/52C04B35/622C04B35/626
CPCC04B35/52C04B35/622C04B35/62605C04B2235/602C04B2235/6567C04B2235/96
Inventor 雷君孔帅斐王彬彬黄红卫李和鑫江明杰
Owner FUNIK ULTRAHARD MATERIAL