Transparent cubic boron nitride-diamond polycrystal preparation method

A cubic boron nitride and diamond polycrystalline technology, applied in chemical instruments and methods, methods of chemically changing substances by atmospheric pressure, chemical/physical processes, etc. Polycrystalline material hardness, wear resistance, thermal stability, difficult to achieve edge flatness and sharpness, etc.

Inactive Publication Date: 2016-08-10
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 af

Method used

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  • Transparent cubic boron nitride-diamond polycrystal preparation method
  • Transparent cubic boron nitride-diamond polycrystal preparation method

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Embodiment 1

[0026] Select the mixed powder of diamond with an average particle size of 0.1-2μm and hexagonal boron nitride with an average particle size of 0.1-2μm, in which the mass fraction of diamond is 80%, according to figure 1 The process flow chart shown prepares high-performance transparent submicron cubic boron nitride-diamond polycrystalline material. The mixed powder of diamond and cubic boron nitride is first treated in hydrochloric acid with a concentration of 20%-30%. The ratio of the added amount of hydrochloric acid to the mixed micropowder is 2 ml / carat (ml / ct), heated in a water bath at 80°C, and continuously stirred for 36 hours. After the treatment, when the fine powder settles, pour out the liquid, and repeatedly dilute with deionized water until it is close to neutral. After the above acid dissolution and impurity removal process is repeated 3-5 times, the mixed fine powder is settled in a beaker, and the liquid is poured after the settlement is completed, leaving the...

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Abstract

The invention relates to a transparent cubic boron nitride-diamond polycrystal preparation method. Hexagonal boron nitride-diamond mixed powder or cubic boron nitride-diamond mixed powder is used as a raw material and has a diamond mass fraction of 30-90%. After purification and removal of impurities, a binder is not used, a sintering unit is assembled and the transparent cubic boron nitride-diamond polycrystal is prepared directly through high temperature superhigh pressure sintering. The transparent cubic boron nitride-diamond polycrystal has uniform phase distribution. Cubic boron nitride grains have submicron-level sizes and diamond crystal grains are uniformly distributed in the cubic boron nitride grains. A large-area compact high-strength transparent cubic boron nitride-diamond interface is formed. The transparent cubic boron nitride-diamond polycrystal with high performances has hardness the same to that of diamond monocrystalline and has heat stability, hardness and wear resistance obviously better than those of a metal binder-containing diamond polycrystal.

Description

Technical field [0001] The invention relates to a method for preparing high-performance transparent submicron cubic boron nitride-diamond polycrystalline powder under high temperature and ultra-high pressure conditions by using hexagonal boron nitride and diamond mixed powder or cubic boron nitride and diamond mixed powder as raw materials. The method of crystalline superhard materials belongs to the field of inorganic non-metallic materials. Background technique [0002] Diamond and cubic boron nitride are the two most widely used superhard materials in the industry. Diamond is the hardest substance known in nature. It has extremely high wear resistance, compressive strength, and thermal conductivity. Large-grain diamond single crystals are expensive and have cleavage surfaces. The size of diamond particles limits many of its functionalities. Application, many fields of industry use more cost-effective polycrystalline diamond material to replace diamond single crystal. Polycry...

Claims

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Application Information

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IPC IPC(8): B01J3/06
CPCB01J3/065B01J2203/062B01J2203/0645B01J2203/0655B01J2203/066B01J2203/068
Inventor 李颖王海阔赵志伟刘俊龙邹文俊
Owner HENAN UNIVERSITY OF TECHNOLOGY
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