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Synthesis method of micropowder grade cubic boron nitride single crystal

A cubic boron nitride and synthesis method technology, applied in chemical instruments and methods, single crystal growth, single crystal growth, etc., can solve problems such as inability to obtain cBN single crystal, and achieve the effect of complete crystal form and stable process

Active Publication Date: 2020-01-10
ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is still a relatively coarse cBN single crystal, and it is impossible to obtain a micropowder-grade cBN single crystal finer than 400 mesh.

Method used

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  • Synthesis method of micropowder grade cubic boron nitride single crystal
  • Synthesis method of micropowder grade cubic boron nitride single crystal
  • Synthesis method of micropowder grade cubic boron nitride single crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for synthesizing a micronized cubic boron nitride single crystal, the specific process is as follows:

[0022] Fine than 150 mesh Li 3 BN 2 , Li 3 N and NH 4 The powder mixture of Cl is used as the catalyst, and the high-purity and high-crystallinity hBN powder with a purity of 99.5%, a boron oxide content of 0.15%, a graphitization index G.I value of 1.6, and 15 μm is used as a synthetic raw material; Li 3 BN 2 , Li 3 N and NH 4 Cl is mixed at a mass ratio of 10:8:2 to form a catalyst, and the catalyst and hBN are mixed uniformly at a mass ratio of 10:90, and then pressed into a cylinder, put into a graphite heating tube to make a composite rod, and put into six-sided top press In the mechanical synthesis chamber, pressurize at a constant speed for 60s to 70MPa, pause the boost, start heating, set the heating power to 4.8KW, keep it under this pressure and power for 180s, control the nucleation of cubic boron nitride crystals, and continue to boost the p...

Embodiment 2

[0024]A method for synthesizing a micronized cubic boron nitride single crystal, the specific process is as follows:

[0025] Fine than 150 mesh Li 3 BN 2 , Li 3 N and NH 4 The powder mixture of Cl is used as the catalyst, and the high-purity and high-crystallinity hBN powder with a purity of 99.3%, a boron oxide content of 0.13%, a graphitization index G.I value of 1.6, and 12 μm is used as a synthetic raw material; Li 3 BN 2 , Li 3 N and NH 4 Cl is mixed at a mass ratio of 11:7:3 to form a catalyst, and the catalyst and hBN are mixed uniformly at a mass ratio of 15:85, and then pressed into a cylinder, put into a graphite heating tube to make a composite rod, and put into a six-sided top press In the mechanical synthesis chamber, pressurize at a constant speed from 55s to 70MPa, pause the boost, start heating, set the heating power to 4.8KW, keep it under this pressure and power for 180s, control the nucleation of cubic boron nitride crystals, and continue to boost the...

Embodiment 3

[0027] A method for synthesizing a micronized cubic boron nitride single crystal, the specific process is as follows:

[0028] Fine than 150 mesh Li 3 BN 2 , Li 3 N and NH 4 The powder mixture of Cl is used as the catalyst, and the high-purity and high-crystallinity hBN powder with a purity of 99.7%, a boron oxide content of 0.18%, a graphitization index G.I value of 1.6, and 14 μm is used as a synthetic raw material; Li 3 BN 2 , Li 3 N and NH 4 Cl is mixed at a mass ratio of 9:12:4 to form a catalyst, and the catalyst and hBN are mixed uniformly at a mass ratio of 17:83, and then pressed into a cylinder, put into a graphite heating tube to make a synthetic rod, and put into a six-sided top press In the mechanical synthesis chamber, pressurize at a constant speed from 55s to 70MPa, pause the boost, start heating, set the heating power to 4.8KW, keep it under this pressure and power for 180s, control the nucleation of cubic boron nitride crystals, and continue to boost th...

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Abstract

The invention discloses a method for synthesizing a micro-powder cubic boron nitride single crystal, and belongs to the technical field of superhard material synthesis. The method comprises the following steps of: (1) taking hBN serving as a raw material, taking a mixture of Li3BN2, Li3N and NH4Cl serving as a catalyst, uniformly mixing the catalyst and the hHBN according to a mass ratio of (10-20): (90-80) and pressing into a cylinder; (2) putting the cylinder pressed in the the step (1) into a graphite heating pipe to assemble into a synthetic rod, and then putting the synthetic rod into a pyrophyllite assembly block to form a synthetic block; (3) placing the assembly block in the step (2) into a high-pressure chamber of a cubic press, and carrying out pressure heating at 70-83 MPa and 4.0-4.8 kw; and (4) taking out a high-temperature and high-pressure composition obtained in the step (3), and obtaining the cubic boron nitride crystal through crushing, water injection soaking, shaking table selection and conventional acid-base treatment.

Description

technical field [0001] The invention belongs to the technical field of synthesis of superhard materials, and in particular relates to a method for synthesizing a micropowder-grade cubic boron nitride single crystal. Background technique [0002] Cubic boron nitride is a typical III-V compound crystal material. It is a superhard material like diamond. It has a high hardness second only to diamond and better chemical stability and thermal stability than diamond. It is used as a super abrasive to make grinding wheels, whetstones, cutting tools, etc. It is especially suitable for the processing of ferrous metal materials. It has the advantages of high efficiency, precision, energy saving, and environmental protection. It has been widely used in the field of modern mechanical processing, especially precision processing and synthesis. application. Among them, in the high-speed occasions of precision and ultra-precision machining, it is necessary to use micropowder-grade cubic bor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/38C30B1/12
CPCC30B1/12C30B29/38
Inventor 张嘉琛张相法位星王永凯刘红伟王大鹏
Owner ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
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