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Preparation method of cubic boron nitride and diamond polycrystal with nanometer structure

A cubic boron nitride and diamond polycrystalline technology, applied in the field of inorganic non-metallic materials, can solve the problems affecting the hardness, wear resistance, thermal stability, large particle size, and difficulty of reaching the edge of the cubic boron nitride-diamond polycrystalline material. Issues such as mouth flatness and sharpness

Inactive Publication Date: 2014-05-21
HENAN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, due to the large particle size of the traditional artificial cubic boron nitride-diamond polycrystalline material, it is difficult to achieve the flatness and sharpness of the cutting edge for ultra-fine cutting tools
In addition, most of the traditional artificial cubic boron nitride-diamond polycrystalline materials contain binders, such as: Co, Ni, etc., which seriously affect the hardness, wear resistance and thermal stability of cubic boron nitride-diamond polycrystalline materials.
[0004] Use hexagonal boron nitride and diamond mixed powder or cubic boron nitride and diamond mixed powder as raw materials to prepare high-performance nanostructured cubic boron nitride-diamond polycrystal under high temperature and ultra-high pressure.

Method used

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  • Preparation method of cubic boron nitride and diamond polycrystal with nanometer structure
  • Preparation method of cubic boron nitride and diamond polycrystal with nanometer structure

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Embodiment 1

[0027] The mixed powder of diamond with an average particle size of 0-2 μm and hexagonal boron nitride with an average particle size of 0-2 μm is selected, wherein the mass fraction of diamond is 85%, according to figure 1 The process flow chart shown prepares a high-performance nanostructured cubic boron nitride-diamond polycrystalline material. The mixed powder of diamond and hexagonal boron nitride is first put into hydrofluoric acid with a concentration of 20%-40%. The ratio of the amount of hydrofluoric acid to the mixed micropowder is 2 milliliters per carat (ml / ct), heated in a water bath at 70°C, and continuously stirred for 72 hours. After the treatment, when the fine powder settles, pour off the liquid and repeat dilution with deionized water until it is close to neutral. Put the hydrofluoric acid-treated mixed micropowder in hydrochloric acid with a concentration of 20%-38%, the ratio of the acid to the mixed micropowder is 2 milliliters / carat (ml / ct), and heat it ...

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Abstract

The invention relates to a preparation method of a cubic boron nitride and diamond polycrystal with a nanometer structure. The preparation method comprises the steps: with hexagonal boron nitride and diamond mixed powder or cubic boron nitride and diamond mixed powder as the raw material, purifying for removing impurities in the raw material, then, assembling a sintering unit without adding any binder, and directly sintering at high temperature and superhigh pressure to prepare the cubic boron nitride and diamond polycrystal with the nanometer structure, wherein diamond accounts for 10-90% of the mass percentage of the raw material. The cubic boron nitride and diamond polycrystal with the nanometer structure is uniform in phase distribution, cubic boron nitride crystal grains have nanometer sizes, and diamond crystal grains are uniformly distributed in the nano cubic boron nitride crystal grains, thus a nanometer cubic boron nitride and diamond interface which is compact in combination and high in strength is formed at a large area. Therefore, the hardness of the high-performance cubic boron nitride and diamond polycrystal with the nanometer structure is equal to that of a diamond monocrystal, and the thermal stability, hardness and wear resistance of the high-performance cubic boron nitride and diamond polycrystal with the nanometer structure are also remarkably higher than those of a diamond polycrystal containing a metal binder.

Description

[0001] The invention relates to a method of preparing high-performance nanostructured cubic boron nitride-diamond polycrystalline superstructure by using hexagonal boron nitride and diamond mixed powder or cubic boron nitride and diamond mixed powder as raw materials, through purification treatment, under high temperature and ultra-high pressure conditions. The method for hard materials belongs to the field of inorganic non-metallic materials. technical background [0002] Diamond and cubic boron nitride are the two most widely used superhard materials in industry. Diamond is the hardest substance known in nature. It has extremely high wear resistance, compressive strength, and heat dissipation rate. Diamond single crystals are expensive and have dissociation surfaces. Polycrystalline diamond materials with higher cost performance are used in many industries. instead of diamond single crystals. Polycrystalline diamond is widely used in the cutting processing of non-ferrous me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/5835C04B35/52C04B35/622
Inventor 王海阔赵志伟陈永杰彭进邹文俊其他发明人请求不公开姓名
Owner HENAN UNIVERSITY OF TECHNOLOGY
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