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Manufacturing method for cubic boron nitride crystal

A technology of cubic boron nitride and a manufacturing method, which is applied in the process of applying ultra-high pressure and other directions, can solve the problem of limited strength and wear resistance, and is not suitable for processing electroplating tools and ceramic adhesive systems, electroplating tools and ceramic bonding. To solve the problems of short service life of the agent system, it can achieve the effect of high thermal stability, high strength and high wear resistance.

Active Publication Date: 2015-05-13
FUNIK ULTRAHARD MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing commonly used cubic boron nitride crystals as abrasives have limited strength and wear resistance, and are not suitable for processing electroplating tools and ceramic binder systems, which will make the service life of electroplating tools and ceramic binder systems relatively short

Method used

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  • Manufacturing method for cubic boron nitride crystal
  • Manufacturing method for cubic boron nitride crystal
  • Manufacturing method for cubic boron nitride crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 of the present invention provides a method for manufacturing cubic boron nitride crystals, which includes the following steps:

[0024] Step 1. According to the mass percentage, 70% of the super-grade hexagonal boron nitride powder with a purity greater than 99%, 7% of lithium nitride, 2.5% of lithium hydride, 1.5% of ammonium fluoride, 2% of titanium nitride and 2% aluminum nitride, the above raw materials are placed in a closed three-dimensional mixer and mixed uniformly for 0.5 hours to obtain a mixed raw material, and then the mixed raw material is placed on a four-column press, and a pressure of 10 MPa is applied for several times Create force, increase the density of the mixed raw material, make it easy to shape, and press into a cylinder and put it into a graphite tube to make a synthetic rod;

[0025] Step 2, the synthetic rod is packed in the high-pressure chamber of the six-sided top press, the diameter of the high-pressure chamber is 45 millimete...

Embodiment 2

[0030] The manufacturing method of the cubic boron nitride crystal provided by Example 2 of the present invention is basically the same as that of Example 1, the difference is that in step 1, according to the mass percentage, 78% of the extra-grade hexagonal boron nitride with a purity greater than 99% is added Powder, 11% lithium nitride, 3.8% lithium hydride, 3% ammonium fluoride, 2.8% titanium nitride and 2.3% aluminum nitride were placed in a closed three-dimensional mixer, fully and uniformly mixed for 0.8 hours , to obtain mixed raw materials; in step 2, put the synthetic rod into the high-pressure chamber of the six-sided top press, pressurize to 24 MPa, and then raise the temperature to 1500 degrees; then within 2 minutes, put the The pressure was raised to a synthetic pressure of 93 MPa, and kept at the high temperature and high pressure for 20 minutes, and finally the temperature was lowered and the pressure was released to obtain the golden cubic boron nitride crysta...

Embodiment 3

[0034] The manufacturing method of the cubic boron nitride crystal provided by Example 3 of the present invention is basically the same as that of Example 1, the difference is that in step 1, according to the mass percentage, 85% of the extra-grade hexagonal boron nitride with a purity greater than 99% is used Powder, 14.5% lithium nitride, 5% lithium hydride, 4.5% ammonium fluoride, 3.5% titanium nitride, and 2.5% aluminum nitride were uniformly mixed in a closed three-dimensional mixer for 1 hour to make Mix the raw materials evenly; in step 2, put the synthetic rod into the high-pressure chamber of the six-sided top press, pressurize to 30 MPa, raise the temperature to 1600 degrees, and continue to pressurize within 3 minutes to make the high-pressure The pressure in the cavity was raised to 95 MPa, and the temperature and pressure were kept constant for 25 minutes, and finally the temperature was lowered and the pressure was released to obtain the golden cubic boron nitride...

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Abstract

The invention provides a manufacturing method for a cubic boron nitride crystal. The manufacturing method comprises the following steps: uniformly mixing hexagonal boron nitride powder, catalyst powder and additives, and pressing the mixture into a synthesis stick, wherein the catalyst powder comprises lithium nitride and lithium hydride, and the additives comprise ammonium fluoride, titanium nitride and aluminium nitride; carrying out high-pressure high-temperature synthesis on the synthesis stick to obtain a cubic boron nitride crystal crude product; crushing the cubic boron nitride crystal crude product to obtain a massive cubic boron nitride crystal crude product; sequentially soaking the massive cubic boron nitride crystal crude product by water and acid-base to obtain a massive cubic boron nitride crystal finished product. The cubic boron nitride crystal obtained by the manufacturing method disclosed by the invention is an equiareal golden crystal, has the characteristics of high strength, high thermal stability, high wear resistance, high crack resistant capability, high thermal stability and the like, is suitable for long-life electroplated tools and ceramic bond systems, as well as is applied to processing hardened carbon tool steel, hard alloys, alloy steel, and nickel-based and cobalt-based high-temperature alloy materials.

Description

technical field [0001] The invention relates to a method for manufacturing superhard materials, in particular to a method for manufacturing cubic boron nitride crystals. Background technique [0002] Cubic boron nitride, with the molecular formula BN, was first developed by R.H. Wintorf in the United States in 1957, and its crystal structure is similar to diamond. Cubic boron nitride is usually synthesized from hexagonal boron nitride and a catalyst under high temperature and pressure. Cubic boron nitride has high hardness, thermal stability and chemical inertness, as well as good infrared transmission and wide band gap. The hardness of cubic boron nitride crystal is second only to diamond, but the thermal The stability is much higher than that of diamond, and it has greater chemical stability to iron series metal elements. It is often used as abrasive and tool materials. Cubic boron nitride grinding tools have excellent grinding performance, not only capable of processing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J3/06
CPCB01J3/06B01J2203/0645B01J2203/066B01J2203/0675
Inventor 马少彬
Owner FUNIK ULTRAHARD MATERIAL
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