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Cubic boron nitride synthetic method

A technology of cubic boron nitride and synthesis method, applied in the direction of nitrogen compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of many crystal defects, poor thermal stability, poor synthesis stability, etc., and achieve high yield and moderate strength , the effect of wide pressure range

Inactive Publication Date: 2010-04-21
ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When alkali metals and alkaline earth metals Li, Mg, and Ca are used as catalyst materials, they have the characteristics of low synthesis conditions, simple operation, high growth rate, and easy growth and thickening. Many, poor crystal shape, so low crushing strength and poor thermal stability; when using nitrides of alkali metals and alkaline earth metals Li 3 N, Mg 3 N 2 , Ca 3 N 2 When used as a catalyst material, the synthesized cubic boron nitride crystal is light yellow, the crystal form is not fully developed, the particle size is fine, and the synthesis stability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Hexagonal boron nitride, Mg 3 N 2 , and MgAl alloy (Mg50Al50) in a mass ratio of 100:10:2, weighed evenly, pressed into a cylindrical shape, packed into a tubular graphite heating element, and then packed into a pyrophyllite assembly block. Synthesize at high temperature and high pressure on a press, the synthesis pressure is 5.0Gpa, the synthesis temperature is 1400°C-1600°C, and the synthesis time is 4 minutes. After stopping the heat, releasing the pressure, taking out the synthetic rod, and purifying with acid and alkali to obtain amber, translucent cubic boron nitride crystals, which are in the shape of equal area, the conversion rate of cubic boron nitride is 30%, and the particle size distribution is 70 / 80~325 / 400, 80 / 100 grit cubic boron nitride has a crush strength of 20 Newtons.

Embodiment 2

[0017] Hexagonal boron nitride, Ca 3 N 2 and MgAl alloy (Mg50Al50) are weighed and mixed in a ratio of 100:9:2 by mass, synthesized under high temperature and high pressure in the same manner as in Example 1, the synthesis pressure is 4.2Gpa, the synthesis temperature is 1300°C to 1500°C, and the synthesis time is 8 minute. After stopping the heat, releasing the pressure, taking out the synthetic rod, and purifying with acid and alkali to obtain amber, transparent cubic boron nitride crystals, which are in the shape of equal area, the conversion rate of cubic boron nitride is 35%, and the particle size distribution is 60 / 70~325 / 400, 80 / 100 grit cubic boron nitride has a crush strength of 25 Newtons.

Embodiment 3

[0019] Hexagonal boron nitride, Li 3 N and MgAl alloy (Mg50Al50) are weighed and mixed in the ratio of mass 100:85:2.5, synthesized under high temperature and high pressure in the same way as in Example 1, the synthesis pressure is 5.8Gpa, the synthesis temperature is 1500°C to 1800°C, and the synthesis time for 12 minutes. After stopping the heat, releasing the pressure, taking out the synthetic rod, and purifying with acid and alkali, the amber and transparent cubic boron nitride crystals were obtained. 60 / 70~325 / 400, 80 / 100 particle size cubic boron nitride has a crushing strength of 28 Newtons.

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PUM

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Abstract

The invention relates to a synthetic method of cubic boron nitride; the method adopts the nitride of alkali metals and alkaline earth metals and the mixture of magnesium aluminum alloy as a catalyst and uses the hexagonal boron nitride as material; the nitride, the magnesium aluminum alloy and the hexagonal boron nitride are evenly mixed according to the mass ratio of 7 to 10 : 1 to 4 : 100 and the single crystal of the cubic boron nitride with the amber color from semitransparent to transparent is synthesized according to the synthetic technique processes of the invention. The method overcomes the defects that the nitride and the metal catalyst material are used separately, and leads the advantages of the two catalyst materials to have good combination; the synthesized cubic boron nitridecrystal has the advantages of amber color, regular shape, proper intensity, synthetic temperature, wide pressure range and high yield, etc.

Description

technical field [0001] The invention belongs to the technical field of superhard material synthesis, in particular to a synthesis method of amber cubic boron nitride. Background technique [0002] Cubic boron nitride is an inorganic crystal material that does not exist in nature and is artificially synthesized. It has a high hardness second only to diamond and better thermal and chemical 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, and energy saving. It is widely used in modern industrial processing, especially in the field of precision processing. [0003] So far, high temperature and high pressure catalytic method is the main method for industrial synthesis of cubic boron nitride. Under the condition of high temperature and high pressure, hexagonal boron nitride is used as raw mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/064
Inventor 张相法
Owner ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
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