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A kind of synthetic method of cubic boron nitride

A cubic boron nitride and synthesis method technology, applied in chemical instruments and methods, ultra-high pressure process, single crystal growth, etc., can solve the problem of thermal shock toughness decline, catalytic performance decline, and affect the conversion rate of cubic boron nitride and other problems, to achieve the effect of complete crystal form and stable process

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

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Problems solved by technology

However, due to the active chemical properties of such alkali metals, alkaline earth metals and their compound materials, they are easy to react with residual water and oxygen in the raw materials, resulting in a decrease in catalytic performance, affecting the conversion rate of synthetic cubic boron nitride, and the formed by-products are easy to carry Inclusions are formed in the cubic boron nitride crystal, resulting in a large decrease in thermal shock toughness, which affects the service life of cubic boron nitride products

Method used

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  • A kind of synthetic method of cubic boron nitride
  • A kind of synthetic method of cubic boron nitride
  • A kind of synthetic method of cubic boron nitride

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Effect test

Embodiment 1

[0018] A kind of synthetic method of cubic boron nitride, concrete process is as follows:

[0019] LiAlH 4 Powder, Li 3 N powder and Li 3 BN 2 Powder is catalyst, and commercially available hBN is raw material (BN content 99.0wt%, B 2 o 3 0.3wt%), by mass ratio LiAlH 4 : Li 3 N: Li 3 BN 2 : hBN=2︰4︰8︰100 The ratio is to take the materials separately, mix them evenly and press them into a cylinder, put them into a graphite heating tube to make a composite rod, assemble them with pyrophyllite and other components to form an assembly block, and put the assembly block into six In the synthesis cavity of the surface-top press, pressurize to 5.2GPa, keep the temperature for 8 minutes after the temperature reaches 1450°C, stop heating after the synthesis, wait for 3 minutes and then release the pressure. The composition was taken out, crushed, soaked in water, and treated with conventional acid and alkali to obtain pure cubic boron nitride, and sieved with a sieve to obtain ...

Embodiment 2

[0021] A kind of synthetic method of cubic boron nitride, concrete process is as follows:

[0022] LiAlH 4 Powder, Li 3 N powder and Li 3 BN 2 Powder is catalyst, and commercially available hBN is raw material (BN content 98.5wt%, B 2 o 3 0.4wt%), by mass ratio LiAlH 4 : Li 3 N: Li 3 BN 2 : hBN=5︰9︰6︰100 The ratio is to take the materials separately, mix them evenly and press them into a cylinder, put them into a graphite heating tube to make a composite rod, assemble them with pyrophyllite and other components to form an assembly block, and put the assembly block into six In the synthesis cavity of the surface-top press, pressurize to 5GPa, and keep the temperature at 1500°C for 10 minutes. After the synthesis, stop heating first, and wait for 3 minutes before releasing the pressure. The composition was taken out, crushed, soaked in water, and treated with conventional acid and alkali to obtain pure cubic boron nitride crystals, and sieved with a sieve to obtain cubi...

Embodiment 3

[0024] A kind of synthetic method of cubic boron nitride, concrete process is as follows:

[0025] LiAlH 4 Powder, Li 3 N powder and Li 3 BN 2 Powder is catalyst, and commercially available hBN is raw material (BN content 98.5wt%, B 2 o 3 0.4%), by mass ratio NaAlH 4 : Li 3 N: Li 3 BN 2: hBN=2︰5︰8︰100 The ratio is to take the materials separately, mix them uniformly and press them into a cylinder, put them into a graphite heating tube to make a composite rod, assemble with pyrophyllite and other components to form an assembly block, and put the assembly block into six In the synthesis cavity of the surface-top press, pressurize to 4.9GPa, keep it for 7 minutes after the temperature reaches 1500°C, stop heating after the synthesis, wait for 3 minutes and then release the pressure. The composition was taken out, crushed, soaked in water, and treated with conventional acid and alkali to obtain pure cubic boron nitride, and sieved with a sieve to obtain cubic boron nitrid...

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Abstract

This application discloses a synthesis method of cubic boron nitride, which includes the following steps: (1) using hBN as raw material, MAlH 4 , Li 3 N and Li 3 BN 2 A mixture of catalysts, M=Li or Na, by mass ratio MAlH 4 , Li 3 N. Li 3 BN 2 , hBN=(2~7):(3~10):(3~10):100 The ratio is to take the materials separately, mix them evenly, and press them into cylinders; (2) Pack the cylinders pressed in step (1) into the graphite heating tube, and then assembled with pyrophyllite to form an assembly block; (3) Put the assembly block in step (2) into the high-pressure chamber of the six-sided top press, under the pressure of 4.8~5.5GPa and the temperature of 1400~1800℃ Keep for 5-15 minutes, stop heating, and release pressure; (4) Take out the high-temperature and high-pressure composite obtained in step (3), and after crushing, soaking in water, and conventional acid-base treatment, cubic boron nitride crystals can be obtained.

Description

technical field [0001] The invention belongs to the technical field of high-temperature and high-pressure synthesis of superhard materials, and in particular relates to a synthesis method of cubic boron nitride. 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 Made into 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 modern mechanical processing, especially in the field of precision processing. [0003] So far, the ultra-high pressure and high temperature catalyst method is the main method for industrial synthesis of cubic boron nitride, that is, under...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J3/06
CPCC30B1/10C30B1/12C30B29/38
Inventor 张相法位星王永凯张嘉琛王大鹏刘红伟刘丹
Owner ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
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