Binder-free polycrystalline cubic boron nitride abrasive and preparation method thereof

A polycrystalline cubic, binder-free technology, applied in chemical instruments and methods, inorganic chemistry, nitrogen compounds, etc., can solve the problem of affecting the hardness, wear resistance and thermal conductivity of PcBN abrasives, which cannot meet the requirements of high-efficiency and high-precision grinding, Reduce the problems of abrasive performance and service life, achieve outstanding self-sharpening and isotropy, avoid sharp increases in grinding force and grinding temperature, and achieve high hardness

Active Publication Date: 2015-07-15
FUNIK ULTRAHARD MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the PcBN abrasive containing binder, although the addition of binder can effectively improve the sintering process of PCBN, reduce its sintering temperature (1200-1500 ℃) and pressure (4-7GPa) (Hara A.Yatsu S .Japanese Patent S55-113859Sept 2 1980; Ran Lv, Jin Liu.High pressure sintering of cubic boron nitride compacts with Al and AlN.Diamond & Related Materials.2008; 17:2062-2066), but the addition of binder will significantly affect the PcBN The hardness, wear resistance and thermal conductivity of abrasives reduce the service performance and life of abrasives, making abrasives and corresponding abrasives unable to meet the needs of high-efficiency and high-precision grinding

Method used

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  • Binder-free polycrystalline cubic boron nitride abrasive and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The polycrystalline cubic boron nitride abrasive without binding agent of the present embodiment is prepared by the following method:

[0038] 1) After filling the hexagonal boron nitride (hBN) powder with a particle size of 0.1-1 μm into the mold, place it in a vacuum hot-pressing sintering furnace at a vacuum degree of 6.6×10 -2 Pa, the molding temperature is 800°C under the molding condition for 0.5h, and then the pressure is applied for preforming, and the loading pressure is 100MPa to obtain a preform;

[0039] 2) Put the preform obtained in step 1) into a rubber glove, perform cold isostatic pressing after vacuuming, the pressure is 150MPa, and the holding time is 2h, to obtain a dense hexagonal boron nitride block; the dense hexagonal boron nitride The oxygen impurity content of the boron nitride block is ≤0.05%, and the bulk density is 1.7g / cm 3 .

[0040] 3) Put the hexagonal boron nitride block obtained in step 2) into a tantalum cup, and form an assembly bl...

Embodiment 2

[0045] The polycrystalline cubic boron nitride abrasive without binding agent of the present embodiment is prepared by the following method:

[0046] 1) After filling the hexagonal boron nitride (hBN) powder with a particle size of 0.5-3 μm into the mold, place it in a vacuum hot-pressing sintering furnace at a vacuum degree of 6.6×10 -2 Pa, the molding temperature is 1000°C under the molding conditions for 1.5h, and then the pressure is applied for preforming, and the loading pressure is 50MPa to obtain a preform;

[0047] 2) Put the preform obtained in step 1) into a rubber glove, perform cold isostatic pressing after vacuuming, the pressure is 200MPa, and the holding time is 5h, to obtain a dense hexagonal boron nitride block; the dense hexagonal boron nitride The oxygen impurity content of the boron nitride block is ≤0.05%, and the bulk density is 2.2g / cm 3 .

[0048] 3) Put the hexagonal boron nitride block obtained in step 2) into a tantalum cup, and form an assembly b...

Embodiment 3

[0053] The polycrystalline cubic boron nitride abrasive without binding agent of the present embodiment is prepared by the following method:

[0054] 1) Put the hexagonal boron nitride (hBN) powder with a particle size of 1 to 5 μm into the mold, and place it in a vacuum hot-pressing sintering furnace at a vacuum degree of 6.6×10 -2 Pa, the molding temperature is 1600°C under the molding conditions for 1.5h, and then the pressure is applied for preforming, and the loading pressure is 75MPa to obtain a preform;

[0055] 2) Put the preform obtained in step 1) into a rubber glove, perform cold isostatic pressing after vacuuming, the pressure is 200MPa, and the holding time is 5h, to obtain a dense hexagonal boron nitride block; the dense hexagonal boron nitride The oxygen impurity content of the boron nitride block is ≤0.05%, and the bulk density is 2.1g / cm 3 .

[0056] 3) Put the hexagonal boron nitride block obtained in step 2) into a tantalum cup, and form an assembly block ...

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Abstract

The invention discloses a binder-free polycrystalline cubic boron nitride abrasive and a preparation method thereof. The preparation method of the abrasive comprises the following steps: 1, adding hexagonal boron nitride powder into a die, and carrying out molding preformation; 2, carrying out cold isostatic pressing treatment on the above preformed product under vacuum conditions; 3, adding the above obtained hexagonal boron nitride block into a tantalum cup in order to form an assembled block together with a pressure transmitting medium; and 4, carrying out high temperature high pressure synthesis treatment on the assembled block, carrying out furnace cooling, demolding, crushing, and grading to prepare the abrasive. The binder-free polycrystalline cubic boron nitride abrasive has the ultrafine crystal structure of submicron dimension cBN monocrystal, and the micro-fragmentation self-sharpening effect and the isotropy of the binder-free polycrystalline cubic boron nitride abrasive overcome passivation, cleavage, anisotropy and other defects of monocrystalline cBN abrasives; and the binder-free polycrystalline cubic boron nitride abrasive disclosed in the invention has high hardness and strength, is suitable for high precision processing of high hardness quenched steel, especially electrical, electronic and optical devices, has very high social values and economic benefit, and is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of superhard materials, and in particular relates to a binder-free polycrystalline cubic boron nitride abrasive, and also relates to a preparation method of the binder-free polycrystalline cubic boron nitride abrasive. Background technique [0002] Cubic boron nitride has high hardness, strong oxidation resistance, superior physical, chemical and thermal stability, especially avoids the limitation of chemical reaction of iron-based alloy materials processed by diamond products, and is used as a substitute for diamond by the international material industry Materials (Wang Guangzu. A review of the properties of cubic boron nitride. Superhard Materials Engineering. 2005,5(17):41-45). Therefore, in recent years, with the development of grinding systems such as grinding centers and ultra-high-speed grinding machines, cubic boron nitride abrasives have become more and more widely used in fields such as precision m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/14C01B21/064
Inventor 王彬彬
Owner FUNIK ULTRAHARD MATERIAL
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