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A kind of preparation method of foamed boron nitride bulk material

A technology of boron nitride block and bulk materials, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of complex preparation process, high cost, low yield, etc., achieve non-toxic methods and reduce production energy consumption And the effect of uniform cost and product appearance

Active Publication Date: 2018-07-31
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: aiming at the shortcomings of the current foamed boron nitride block materials, which have complex preparation process, high cost, need to use toxic solvents, low yield, and difficult to obtain large macroscopic size, to provide a nitrogen-based A green, low-cost, high-yield and high-quality preparation method for large-size foamed boron nitride bulk materials assembled from boron nitride fibers

Method used

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  • A kind of preparation method of foamed boron nitride bulk material
  • A kind of preparation method of foamed boron nitride bulk material
  • A kind of preparation method of foamed boron nitride bulk material

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Add 5.0 g of melamine and 7.5 g of boric acid to a glass container containing 250 ml of water so that each ml of water contains 0.02 g of melamine and 0.03 g of boric acid. After stirring for 2 hours, put the glass container into a temperature control system. In a constant temperature water bath, heat to 95°C to completely dissolve melamine and boric acid and keep it warm for 4 hours;

[0032] (2) Put the stable melamine-boric acid-water mixed solution and its container obtained in step (1) into an ultrasonic instrument with adjustable ultrasonic power and temperature, and set the ultrasonic power to 40kHz and the temperature to At 70°C, heat preservation and ultrasound for 5 hours, a white block precipitated in the solution;

[0033] (3) Place the white block and the solution obtained in step (2) in a freeze dryer and vacuum freeze-dry (temperature -40°C, pressure 30Pa, drying time 120 hours) to obtain a dry white solid precursor;

[0034] (4) Heat the white solid precur...

Embodiment 2、 example 3

[0037] The concentration of melamine in step (1) in Example 1 was changed to 0.01 g and 0.05 g melamine per milliliter of water, and the other operations were the same as in Example 1, and the product density was 12 mg / cm. 3 And 65mg / cm 3 , Others are the same as in Example 1.

Embodiment 4、 example 5

[0039] The concentration of boric acid in step (1) in Example 1 was changed to 0.01 g and 0.05 g boric acid per milliliter of water, and the other operations were the same as in Example 1. The density of the obtained product was 15 mg / cm. 3 And 43mg / cm 3 , Others are the same as in Example 1.

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Abstract

The invention relates to a preparation method of a foamed boron nitride block material. The preparation method comprises the following steps: (1) preparing a melamine-boric acid-water mixed solution; (2) carrying out ultrasonic treatment for 1h to 24h by an ultrasonic apparatus; separating out a white block body; (3) putting the white block body and a residual solution into a freezing dryer; freezing and pumping in vacuum to obtain a dried white solid precursor; (4) keeping the heat of the white solid precursor at 900 DEG C to 1500 DEG C for 2h to 6h under a protective atmosphere; cooling under the protective atmosphere to room temperature, so as to obtain a white block-shaped solid substance, namely a block-shaped boron nitride foam material. According to the preparation method of the foamed boron nitride block material, the energy consumption and cost of production are reduced; the method has no toxin and has high efficiency, and is applicable to large-scale and industrial synthesis of the foamed boron nitride block material; the prepared foamed boron nitride block material is composed of boron nitride micro-nano fibers with a high length-diameter ratio, and has the characteristics of good connectivity, large specific surface area, super hydrophobicity and the like.

Description

Technical field [0001] The technical scheme of the present invention relates to the technical synthesis field of boron nitride micro-nano materials, and is specifically a method for synthesizing foamed boron nitride bulk materials. Background technique [0002] Boron nitride, also known as white graphite. Due to its superior properties such as high thermal conductivity, chemical stability, light transparency, electrical insulation, neutron absorption performance, lubricity, etc., it has received very extensive attention and has been used in machinery, metallurgy, electronics, aerospace And other fields. [0003] The foamed boron nitride bulk material is a kind of three-dimensional network structure which is connected or assembled by one-dimensional boron nitride fibers or two-dimensional boron nitride sheets. While the foamed boron nitride bulk material perfectly inherits the superior properties of boron nitride, its structure itself has low density, high porosity, high specific ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/064
CPCC01B21/064C01P2002/72C01P2004/03C01P2004/04C01P2006/10C01P2006/80
Inventor 黄阳袁晓海林靖王伟佳唐成春
Owner HEBEI UNIV OF TECH
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