Preparation method of hexagonal dense boron nitride block body

A boron nitride block and cubic boron nitride technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve problems such as reducing high-temperature performance

Active Publication Date: 2018-09-14
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the density of hexagonal boron nitride obtained by adding sintering aids has been improved to a certain extent, its high-temperature performance will be reduced

Method used

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  • Preparation method of hexagonal dense boron nitride block body

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Embodiment 1

[0026] as attached figure 1 The process shown in the process, the preparation method of dense hexagonal boron nitride block, including the preparation of composite boron nitride powder, sintering of dense boron nitride block, the specific steps are as follows:

[0027] (1) Preparation of composite boron nitride powder: first weigh 2.5g of 200nm and 0.25g of 100nm cubic boron nitride powder respectively, mix them in a mortar, grind for 10min, and put the ground mixed powder into a beaker , and then measure 50ml of absolute ethanol, pour it into a beaker with mixed powder, put the beaker into an ultrasonic cleaner, and use 120W power to ultrasonically disperse for 20min; then ultrasonically oscillate the dispersed solution and place it under constant temperature magnetic stirring On the mixer, at a temperature of 65°C, stir slowly to evaporate the solvent until the solution becomes a paste, then put the obtained sample in an oven at 60°C and dry until it is basically dry; take i...

Embodiment 2

[0030] A method for preparing a dense isotropic hexagonal boron nitride block is characterized in that it comprises two steps of preparation of composite boron nitride powder and sintering of the dense boron nitride block, and the specific steps are as follows:

[0031] (1) Preparation of composite boron nitride powder: first weigh 2.5g of 200nm and 0.25g of 100nm cubic boron nitride powder respectively, mix them in a mortar, grind for 10min, put the ground mixed powder into a beaker , then measure 50ml of absolute ethanol, pour it into a beaker with mixed powder, put the beaker into an ultrasonic cleaner, and use 120W power to ultrasonically disperse for 20min; Stir slowly on a stirrer at a temperature of 65°C to evaporate the solvent until the solution becomes a paste, then put the obtained sample in an oven at 60°C and dry until it is basically dry; take it out and put it in a mortar, drip Add a few drops of absolute ethanol to grind until dry, and repeat the operation 4 ti...

Embodiment 3

[0034] A method for preparing a dense isotropic hexagonal boron nitride block is characterized in that it comprises two steps of preparation of composite boron nitride powder and sintering of the dense boron nitride block, and the specific steps are as follows:

[0035] (1) Preparation of composite boron nitride powder: first weigh 2.5g of 200nm and 0.25g of 100nm cubic boron nitride powder respectively, mix them in a mortar, grind for 10min, put the ground mixed powder into a beaker , then measure 50ml of absolute ethanol, pour it into a beaker with mixed powder, put the beaker into an ultrasonic cleaner, and use 120W power to ultrasonically disperse for 20min; Stir slowly on a stirrer at a temperature of 65°C to evaporate the solvent until the solution becomes a paste, then put the obtained sample in an oven at 60°C and dry until it is basically dry; take it out and put it in a mortar, drip Add a few drops of absolute ethanol to grind until dry, and repeat the operation 4 ti...

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Abstract

The invention relates to a preparation method of an isotropic hexagonal dense boron nitride block body. The method comprises the steps of: 1, preparation of compound boron nitride powder: uniformly mixing cubic boron nitride powder in two or more different particle sizes as a precursor for preparing the hexagonal dense boron nitride block body, and 2, sintering preparation of the hexagonal dense boron nitride block body: pressing, heating and sintering the mixed cubic boron nitride powder. At a high temperature, cubic boron nitride particles are converted into onion-shaped hexagonal boron nitride and are expanded in volume to form the isotropic hexagonal dense boron nitride block body, no additive is introduced into the hexagonal boron nitride block body prepared by the method, and the block body has a unique crystal structure. The block body can be used for the mechanical and electronic industry, nuclear power industry and the like.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a method for preparing a dense isotropic hexagonal boron nitride block. Background technique [0002] Dense hexagonal boron nitride has small anisotropy ratio, good mechanical strength, extremely low open porosity, and is easy to make high-strength and high-density products. It is an ideal material for making bearings, crucibles, electrical insulators and other products. The preparation method of dense hexagonal boron nitride is very important for the industry development of anti-friction materials and refractory materials, technology in related fields and national industrial development. [0003] Hexagonal boron nitride is a covalently bonded compound with a low self-diffusion coefficient at high temperature, making it a difficult material to sinter. Moreover, the hexagonal boron nitride grains have a special sheet morphology, and its binding force in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/064
CPCC01B21/0648
Inventor 杨浩田冉佳佳林坤鹏章文李建林王连军江莞范宇驰
Owner HAINAN UNIVERSITY
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