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Preparation method of porous polycrystalline cubic boron nitride

A technology of cubic boron nitride and boron nitride micropowder, which is applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve problems such as hardness and thermal stability reduction, and difficulty in breaking polycrystalline cubic boron nitride. Improved machining accuracy, good grinding life, and good stability

Active Publication Date: 2022-02-08
ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
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Problems solved by technology

[0003]However, there are still deficiencies in the above structure. Polycrystalline cubic boron nitride mainly uses CBN micropowder and metal or ceramic materials as binder. It is made by sintering under high pressure and high temperature conditions of 6GPa, 1300-1400°C. During sintering, the particle size of CBN, binder components and their content should be adjusted according to specific application conditions. The polycrystalline cubic boron nitride prepared by this method is used It is difficult to be used for abrasive crushing, and due to the presence of binders, its hardness and thermal stability are reduced

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preparation example Construction

[0034] Please refer to figure 1 and figure 2 ,in, figure 1 It is a schematic diagram of the composite layer structure of cubic boron nitride micropowder block and boron nitride binder in the synthesis cavity; figure 2 Schematic diagram of the structure of porous polycrystalline cubic boron nitride abrasive under the scanning electron microscope. The preparation method of porous polycrystalline cubic boron nitride comprises the following steps:

[0035] S1. Raw materials:

[0036] (1). Prepare raw materials: boron nitride powder, cubic boron nitride powder, dilute hydrochloric acid;

[0037] S2. Preparation of flaky boride nitride binder:

[0038] (1). Press the boride nitride powder prepared in the above S1 into tablets through equipment;

[0039] (2). The boride nitride powder pressed into sheets in the above (1) is placed in a vacuum furnace for sintering, resulting in a flake boride nitride binder;

[0040] S3, preparation mixture:

[0041] (1). The cubic boron ni...

Embodiment 1

[0061] A preparation method of porous polycrystalline cubic boron nitride comprises the following steps:

[0062] (1). Prepare raw materials: boron nitride powder, cubic boron nitride powder, dilute hydrochloric acid, the particle size of the boron nitride powder is ≤10 μm, and the cubic boron nitride powder has a particle size of 10-20 μm. The boride nitride powder is magnesium boride nitride, lithium boride nitride or calcium boride nitride;

[0063] (2). The boride nitride powder prepared in the above (1) is pressed into a tablet by equipment, and then the boride nitride powder pressed into a tablet is placed in a vacuum furnace for sintering, resulting in a sheet-like boride nitride bonded agent, the vacuum degree of the vacuum furnace is below 1×10-5Pa, the temperature of the vacuum furnace is 1500°C, and the sintering time is 2h;

[0064] (3). The cubic boron nitride micropowder prepared in the above (1) is extruded into blocks by equipment, and then the flake boron nit...

Embodiment 2

[0069] A preparation method of porous polycrystalline cubic boron nitride comprises the following steps:

[0070] (1). Prepare raw materials: boron nitride powder, cubic boron nitride powder, dilute hydrochloric acid, the particle size of the boron nitride powder is ≤10 μm, and the cubic boron nitride powder has a particle size of 5-10 μm. The boride nitride powder is magnesium boride nitride, lithium boride nitride or calcium boride nitride;

[0071] (2). The boride nitride powder prepared in the above (1) is pressed into a tablet by equipment, and then the boride nitride powder pressed into a tablet is placed in a vacuum furnace for sintering, resulting in a sheet-like boride nitride bonded agent, the vacuum degree of the vacuum furnace is 1×10 -5 Below Pa, the temperature of the vacuum furnace is 1600°C, and the sintering time is 3h;

[0072] (3). The cubic boron nitride micropowder prepared in the above (1) is extruded into blocks by equipment, and then the flake boron n...

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Abstract

The invention provides a preparation method of porous polycrystalline cubic boron nitride. The preparation method of the porous polycrystalline cubic boron nitride comprises the following steps of: S1, preparing raw materials: (1) preparing the raw materials: nitrogen boride powder, cubic boron nitride micro powder and diluted hydrochloric acid; S2, preparing a flaky nitrogen boride binding agent: (1) pressing the nitrogen boride powder prepared in the step S1 into sheets through equipment; and (2) sintering the nitrogen boride powder pressed into sheets in the step (1) in a vacuum furnace so as to obtain a sheet-shaped nitrogen boride binding agent; and S3, preparing a mixture: (1) extruding the cubic boron nitride micro powder prepared in the step S1 into blocks through equipment. The preparation method of the porous polycrystalline cubic boron nitride, provided by the invention, has the advantages that the processing efficiency and the processing precision can be greatly improved, the high temperature resistance is excellent, the stability is better, and the grinding life is long.

Description

technical field [0001] The invention belongs to the technical field of high-temperature and high-pressure synthesis of superhard materials, and in particular relates to a preparation method of porous polycrystalline cubic boron nitride. Background technique [0002] Cubic boron nitride (CBN) is an artificial crystal synthesized by WENTORF under high temperature and high pressure conditions in 1957. Its hardness is second only to diamond, but its thermal stability and chemical stability are better than diamond. It is widely used in processing ferrous metals , high temperature resistant alloys, titanium alloys and other materials that are difficult to process with diamond tools. Single crystal cubic boron nitride is small in size, anisotropic, and has cleavage planes, so people developed and prepared polycrystalline cubic boron nitride (PCBN). Due to its good application prospects and polycrystalline structure, the polycrystalline cubic boron nitride abrasive has both process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/064C09K3/14
CPCC01B21/0648C09K3/1418C01P2004/03
Inventor 张相法王永凯位星王大鹏薛磊刘红伟贾帅中
Owner ZHENGZHOU ZHONGNAN JETE SUPERABRASIVES
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