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High temperature and high pressure direct synthesis method of cubic boron nitride in titanium nitride plated coating

A technology of cubic boron nitride and titanium nitride plating, applied in the application of ultra-high pressure process, etc., can solve the problems of insufficient toughness, affecting performance, high brittleness, etc., and achieve improved thermal stability and toughness, good toughness, and improved The effect of tool performance

Inactive Publication Date: 2013-09-04
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

[0003] Although cubic boron nitride has excellent properties such as high hardness, high wear resistance, and high chemical inertness, because cubic boron nitride has high hardness, it is also relatively brittle and has insufficient toughness.
In addition, it is also easy to oxidize at high temperature, which affects its performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A high temperature and high pressure direct synthesis method of cubic boron nitride coated with titanium nitride coating, the method is to use hexagonal boron nitride with a purity of 96% as raw material, and lithium nitride Li 3 N is the catalyst, and titanium metal powder with a purity of 99% is used as an additive. After mixing hexagonal boron nitride: lithium nitride at a weight ratio of 1:0.1, add titanium metal powder in an amount of 1wt% of the total mixture. , the cubic boron nitride product coated with titanium nitride coating is synthesized by high temperature and high pressure, the synthesis temperature is 1500°C, the synthesis pressure is 5.0GPa, and the heat preservation and pressure holding time is 10 minutes. The method includes the following steps:

[0022] A. Material preparation: use hexagonal boron nitride with a purity of 96% as raw material, and lithium nitride Li 3 N is the catalyst, and the titanium metal powder with a purity of 99% is used as an...

Embodiment 2

[0029] A high-temperature and high-pressure direct synthesis method of cubic boron nitride coated with titanium nitride coating, the method is to use hexagonal boron nitride with a purity of 95% as raw material, and lithium nitride Li 3 N is the catalyst, and titanium metal powder with a purity of 99% is used as an additive. After mixing hexagonal boron nitride: lithium nitride at a weight ratio of 1:0.2, metal titanium is added in an amount of 0.5wt% of the total mixture. Powder, the cubic boron nitride product coated with titanium nitride coating is synthesized under high temperature and high pressure, the synthesis temperature is 1000°C, the synthesis pressure is 4.0GPa, and the heat preservation and pressure holding time is 3 minutes. The method includes the following steps:

[0030] A. Material preparation: use hexagonal boron nitride with a purity of 95% as raw material, and lithium nitride Li 3 N is the catalyst, and the titanium metal powder with a purity of 99% is us...

Embodiment 3

[0037] A high temperature and high pressure direct synthesis method of cubic boron nitride coated with titanium nitride coating, the method is to use hexagonal boron nitride with a purity of 98% as raw material, and lithium nitride Li 3 N is the catalyst, and titanium metal powder with a purity of 99.9% is used as an additive. After mixing hexagonal boron nitride: lithium nitride at a weight ratio of 1:0.15, metal titanium is added in an amount of 5.0wt% of the total mixture. Powder, a titanium nitride-coated cubic boron nitride product synthesized by high temperature and high pressure, the synthesis temperature is 1550°C, the synthesis pressure is 5.0GPa, and the heat preservation and pressure holding time is 10 minutes. The method includes the following steps:

[0038] A. Material preparation: use hexagonal boron nitride with a purity of 95% as raw material, and lithium nitride Li 3 N is the catalyst, and titanium metal powder with a purity of 99.9% is used as an additive f...

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Abstract

The invention relates to a high temperature and high pressure direct synthesis method of cubic boron nitride in a titanium nitride plated coating, relating to a high temperature and high pressure synthesis method of an ultra-hard material. The method takes hexagonal boron nitride as a raw material, an alkali metal nitride or alkaline-earth metal nitride or boron nitride as a catalyst, and metallic titanium powder or a metallic titanium compound as an additive. The method comprises the following steps of: mixing the hexagonal boron nitride and the alkali metal nitride or the alkaline-earth metal nitride or the boron nitride according to a weight proportion of 1:(0.1-0.3), adding the metallic titanium powder or the metallic titanium compound accounting for 0.5wt%-10wt% of the total mixture, and synthesizing a cubic boron nitride product with the titanium nitride plated coating at a high temperature and a high pressure, wherein the synthesis temperature is 1000 to 1800 DEG C, the synthesis pressure is 4.0-6.0 GPa, and the temperature and the pressure last for 3-15 minutes. The cubic boron nitride provided by the invention has the characteristics of high hardness, good abrasion resistance, good high temperature resistance, good tenacity, thermal conduction and electrical conduction, and is particularly suitable for preparation of polycrystalline cubic boron nitride products and tools.

Description

technical field [0001] The invention relates to a high-temperature and high-pressure synthesis method of superhard materials, in particular to a high-temperature and high-pressure direct synthesis method of cubic boron nitride with a titanium nitride coating. Background technique [0002] Cubic boron nitride (cBN) is a superhard material second only to diamond in hardness. 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. It has been widely used in the field of processing high hardness steel and its alloy materials as abrasives and products made of knives, grinding wheels and quilting grinding bars. Usually cubic boron nitride is produced under high temperature and high pressure (10GPa, 2000 o C) It is directly converted from hexagonal boron nitride. In the presence of a catalyst, the conditions for synthes...

Claims

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Application Information

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