Synthesis method of millimeter-sized cubic boron nitride large single crystal

A technology of cubic boron nitride and synthesis methods, applied in chemical instruments and methods, single crystal growth, single crystal growth, etc., can solve the problems of poor synthesis quality, difficult synthesis, slow growth, etc., and achieve the effect of complete crystal form

Active Publication Date: 2017-07-21
ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the synthesis process of single crystal cubic boron nitride finer than 30 mesh is relatively mature, and it is difficult to synthesize cubic boron nitride single crystal of coarser to 18 mesh complete crystal form
Most foreign countries use the seed crystal method to synthesize large-particle cubic boron nitride. The process is complicated, the assembly cost is high, the growth is slow, and the synthesis quality is poor, so it cannot be popularized and applied on a large scale.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The ternary catalyst Li 3 BN 2 Powder and Binary Catalyst Li 3 N powder, elemental metal Mg powder and refined HBN are raw materials, according to mass ratio: Li 3 BN 2 : Li 3 The ratio of N:Mg:HBN=10:8:2:100 is taken separately, mixed uniformly and pressed into a cylinder, put into a graphite heating tube to make a synthetic rod, put into the synthetic chamber of a six-sided top press, and added When the pressure reaches 35MPa, start heating. When it reaches 42MPa, the temperature reaches 1650°C and maintains for 8 minutes. Continue to increase the pressure to 80MPa. The temperature reaches 1650°C and maintains for 60 minutes. pressure. The composite was taken out, crushed, soaked in water, and subjected to conventional acid-base treatment to obtain cubic boron nitride crystals, and sieved with a sieve to obtain cubic boron nitride crystals of various particle sizes. The crystals were amber and transparent, and 16-20 meshes accounted for The proportion can reach ...

Embodiment 2

[0017] The ternary catalyst Li 3 BN 2 Powder and Binary Catalyst Li 3 N powder, elemental metal Al powder and refined HBN are used as raw materials, according to mass ratio: Li 3 BN 2 : Li 3 The ratio of N:Al:HBN=10:8:2:100 is taken separately, mixed uniformly and pressed into a cylinder, put into a graphite heating tube to make a synthetic rod, put into the synthetic chamber of a six-sided top press, and added When the pressure reaches 35MPa, start heating. When it reaches 42MPa, the temperature reaches 1600°C and maintains for 8 minutes. Continue to increase the pressure to 80MPa. The temperature reaches 1650°C and maintains for 80 minutes. pressure. The composite was taken out, crushed, soaked in water, and subjected to conventional acid-base treatment to obtain cubic boron nitride crystals, and sieved with a sieve to obtain cubic boron nitride crystals of various particle sizes. The crystals were amber and transparent, and 16-20 meshes accounted for The proportion ca...

Embodiment 3

[0019] The ternary catalyst Mg 3 B 2 N 4 Powder and Binary Catalyst Li 3 N powder, elemental metal Mg powder and refined HBN are used as raw materials, according to mass ratio: Mg 3 B 2 N 4 : Li 3 The ratio of N:Mg:HBN=12:8:2:100 is taken separately, mixed evenly and pressed into a cylinder, put into a graphite heating tube to make a synthetic rod, put into the synthetic cavity of a six-sided top press, and added When the pressure reaches 35MPa, start heating. When it reaches 42MPa, the temperature reaches 1550°C and maintains for 8 minutes. Continue to increase the pressure to 80MPa. The temperature reaches 1600°C and maintains for 90 minutes. pressure. The composite was taken out, crushed, soaked in water, and conventional acid-base treatment to obtain cubic boron nitride crystals, and sieved with a sieve to obtain cubic boron nitride crystals of various particle sizes. The crystals were yellow and translucent, and 16-20 meshes accounted for The proportion can reach ...

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Abstract

The invention belongs to the technical field of cubic boron nitride synthesis, and particularly relates to a synthesis method of millimeter level cubic boron nitride large crystals. The method is mainly characterized in that high-purity HBN raw materials with the Bn content larger than or equal to 99.5% and the B2O3 content smaller than or equal to 0.2% are selected as raw materials, the raw materials are mixed with ternary catalyst Li3BN2 or Mg3B2N4 or Ca3B2N4 powder, binary catalyst Li3N powder, and pure metal Mg or Al powder, and the millimeter level cubic boron nitride large crystals are synthesized according to a technological method. The crystal size of the cubic boron nitride synthesized according to the method reaches 18 meshes, the proportion of the cubic boron nitride with the crystal size being 16-30 meshes reaches 50-70%, the crystal form is complete, the technology is stable, and production value is achieved.

Description

technical field [0001] The invention belongs to the technical field of cubic boron nitride synthesis, and in particular relates to a method for synthesizing a large single crystal of cubic boron nitride at the millimeter scale. Background technique [0002] The hardness of cubic boron nitride is second only to diamond, and it has high thermal stability and strong chemical stability. The method of industrial synthesis of cubic boron nitride is usually hexagonal boron nitride as raw material, alkali metal or alkaline earth metal Li, Mg, Ca, etc. and their nitrides and boron nitrides as catalyst materials under high temperature and high pressure conditions. The synthesis is A special crystal growth process. It is difficult to grow thick cubic boron nitride crystals. After reaching a certain growth time (usually within 30 minutes), prolonging the synthesis time has no effect on the growth of cubic boron nitride crystals. Coarse-grained cubic boron nitride is a new material with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J3/06C30B1/12C30B29/40
Inventor 张相法贾攀张奎位星刘红伟
Owner ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
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