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Method for compounding fine-particle cubic boron nitride single crystal

A technology of cubic boron nitride and a synthesis method, which is applied in the field of superhard material manufacturing, can solve the problems of complicated processing, long synthesis time, and many steps, and achieves the effects of simplifying the synthesis process, saving synthesis time, and avoiding waste.

Inactive Publication Date: 2011-04-20
柳州市大荣非金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for synthesizing fine-grained cubic boron nitride single crystals. The present invention can solve the problem that the existing synthesis methods of fine-grained cubic boron nitride single crystals have many steps, long synthesis time and complicated post-processing. , most of the obtained fine-grained cubic boron nitride is not a complete single crystal crystal form

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Hexagonal boron nitride and lithium nitride powders with a purity ≥ 95% are uniformly mixed at a weight ratio of 1:0.1 and pre-pressed into a cylindrical rod and loaded into a graphite tube. Since the rod itself is an insulator, the There is no need to add an insulating sleeve between the rod and the graphite tube, the rod is slightly lower than the graphite tube, put it into the pyrophyllite synthesis assembly block, and perform high-temperature and high-pressure synthesis on a domestic six-sided top press. At 5.0GPa, 1450 o Under the condition of C, heat preservation and pressure for 5 minutes, wait for 2 minutes after stopping the heating, slowly reduce the pressure to normal pressure, then take out the rod and carry out the following chemical treatment to obtain a complete cubic boron nitride single crystal crystal with 111 crystal planes: The substance is boiled in sulfuric acid: nitric acid: water = 1:3:10 acid solution for half an hour, and then boiled in 30% sod...

Embodiment 2

[0015] Hexagonal boron nitride and lithium nitride with a purity of ≥95% powder According to the weight ratio of 1:0.15, uniformly mix and pre-press into a cylindrical bar and put it into the graphite tube. Since the bar itself is an insulator, there is no need to add an insulating sleeve between the bar and the graphite tube. Slightly lower than the graphite tube, put it into the pyrophyllite synthesis assembly block, and perform high temperature and high pressure synthesis on a domestic six-sided top press. At 5.0GPa, 1450 o Under the condition of C, heat preservation and pressure for 5 minutes, wait for 2 minutes after stopping the heating, slowly reduce the pressure to normal pressure, then take out the rod and carry out the following chemical treatment to obtain a complete cubic boron nitride single crystal crystal with 111 crystal planes: The substance is boiled in sulfuric acid: nitric acid: water = 1:3:10 acid solution for half an hour, and then boiled in 30% sodium h...

Embodiment 3

[0017] Hexagonal boron nitride and lithium nitride with a purity of ≥95% powder Mix evenly according to the weight ratio of 1:0.3 and pre-press into a cylindrical rod and put it into the graphite tube. Since the rod itself is an insulator, there is no need to add an insulating sleeve between the rod and the graphite tube. Slightly lower than the graphite tube, put it into the pyrophyllite synthesis assembly block, and perform high temperature and high pressure synthesis on a domestic six-sided top press. At 5.0GPa, 1450 o Under the condition of C, heat preservation and pressure for 5 minutes, wait for 2 minutes after stopping the heating, slowly reduce the pressure to normal pressure, then take out the rod and carry out the following chemical treatment to obtain a complete cubic boron nitride single crystal crystal with 111 crystal planes: The substance is boiled in sulfuric acid: nitric acid: water = 1:3:10 acid solution for half an hour, and then boiled in 30% sodium hydrox...

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Abstract

The invention discloses a method for compounding a fine-particle cubic boron nitride single crystal. In the method, hexagonal boron nitride is used as raw material, lithium nitride is used as catalytic agent and the fine-particle cubic boron nitride product is compounded under the condition of high temperature and high pressure, wherein the weight ratio of the hexagonal boron nitride to the lithium nitride is 1:0.1 to 0.3, the compounding time is 2 to 5 minutes, the compounding temperature is 1300 to 1600 DEG C, and the compounding pressure is 4.5 to 5.5 GPa. After finishing the compounding, the compounded material containing fine-particle cubic boron nitride single crystal is acquired. Compared with the prior art, the invention solves the problems that the traditional compounding method of the fine-particle cubic boron nitride single crystal has many steps, long compounding time and complex post processing and obtains incomplete single crystal shape of majority acquired fine-particle cubic boron nitride. Besides, the method of the invention is short in compounding time, has proper compounding pressure and is beneficial to save instrument loss and industrialized volume production.

Description

technical field [0001] The invention relates to the technical field of superhard material manufacture, in particular to a method for synthesizing cubic boron nitride single crystals using cubic boron nitride as a raw material. Background technique [0002] Cubic boron nitride (cBN) has extremely strong hardness and is widely used in industry as an abrasive material. Although the hardness of cubic boron nitride is less than that of diamond, it is especially suitable for processing iron group elements because of its strong chemical inertness to iron group elements and their alloys. Usually cubic boron nitride is in 2000 o It is directly converted from hexagonal boron nitride under the high temperature of C and the high pressure of 10GPa. In the presence of a catalyst, the conditions for the synthesis of cubic boron nitride are greatly reduced. Commonly used catalysts for the synthesis of cubic boron nitride include alkali metals, alkaline earth metals, and their nitrides a...

Claims

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Application Information

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IPC IPC(8): B01J3/06C30B29/38
Inventor 马红安贾晓鹏
Owner 柳州市大荣非金属材料有限公司
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