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Method for preparing high-crystallinity spherical hexagonal boron nitride powder body

A technology of hexagonal boron nitride and high crystallinity, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of cumbersome process and high cost, and achieve the effect of simple process, low cost and short production cycle

Inactive Publication Date: 2014-12-24
SHENYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the above two methods, the first method uses spheroidized graphite as a raw material and the whole process is carried out at a high temperature of 1600-2100 degrees Celsius, it is easy to bring carbon impurities into the formed hexagonal boron nitride, and the cost is relatively high
The second method also needs to be carried out at high temperature, and nitrogen or inert gas is required to bring it into the nitriding furnace, the process is cumbersome and the cost is high

Method used

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  • Method for preparing high-crystallinity spherical hexagonal boron nitride powder body
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  • Method for preparing high-crystallinity spherical hexagonal boron nitride powder body

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Effect test

Embodiment 1

[0018] A catalytic preparation method of spherical hexagonal boron nitride powder with high crystallinity is

[0019] 1. Ingredients: Use an electronic balance to weigh 1.5 grams of boric acid, 10 grams of borax, 15 grams of urea, 0.5 grams of catalyst magnesium powder and 4.515 grams of network. Among them, 3.5 grams of acrylamide, 0.14 grams of N,N-methylenebisacrylamide, and 0.875 grams of ammonium persulfate were set aside.

[0020] 2. Preparation of hexagonal boron nitride precursor gel: firstly, boric acid, borax and urea were dissolved in deionized water to form a homogeneous solution. Put the above solution in a constant temperature water bath at 60°C and stir thoroughly, then add acrylamide, N,N-methylenebisacrylamide and ammonium persulfate in sequence. Continue stirring to obtain a precursor gel.

[0021] 3. Preparing the precursor powder: drying the precursor gel in a drying oven, then thoroughly drying and dehydrating in a box furnace at 200 degrees Celsius, and...

Embodiment 2

[0029] A catalytic preparation method of spherical hexagonal boron nitride powder with high crystallinity is

[0030] 1. Ingredients: Use an electronic balance to weigh 2 grams of boric acid, 12 grams of borax, 18 grams of urea, 1.5 grams of catalyst magnesium powder and 4.644 grams of network agent. Among them, 3.6 grams of acrylamide, 0.144 grams of N,N-methylenebisacrylamide, and 0.9 grams of ammonium persulfate were set aside.

[0031] 2. Preparation of hexagonal boron nitride precursor gel: firstly, boric acid, borax and urea were dissolved in deionized water to form a homogeneous solution. Put the above solution in a constant temperature water bath at 63 degrees Celsius and stir well, then add acrylamide, N,N-methylenebisacrylamide and ammonium persulfate in sequence. Continue stirring to obtain a precursor gel.

[0032] 3. Preparing the precursor powder: drying the precursor gel in a drying oven, then thoroughly drying and dehydrating in a box furnace at 200 degrees C...

Embodiment 3

[0037] A catalytic preparation method of spherical hexagonal boron nitride powder with high crystallinity is

[0038] 1. Ingredients: Use an electronic balance to weigh 3 grams of boric acid, 12 grams of borax, 15 grams of urea, 1 gram of catalyst magnesium powder and 4.9 grams of network agent. Among them, 3.8 grams of acrylamide, 0.152 grams of N,N-methylenebisacrylamide, and 0.95 grams of ammonium persulfate are set aside.

[0039] 2. Preparation of hexagonal boron nitride precursor gel: firstly, boric acid, borax and urea were dissolved in deionized water to form a homogeneous solution. Put the above solution in a constant temperature water bath at 70°C and stir thoroughly, then add acrylamide, N,N-methylenebisacrylamide and ammonium persulfate in sequence. Continue stirring to obtain a precursor gel.

[0040] 3. Preparing the precursor powder: drying the precursor gel in a drying oven, then thoroughly drying and dehydrating in a box furnace at 200 degrees Celsius, and t...

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Abstract

The invention discloses a method for preparing a high-crystallinity spherical hexagonal boron nitride powder body. The method comprises the following steps of: 1, dosing, wherein boric acid, borax and urea are used as raw materials; magnesium powder is used as a catalyst; and acrylamide, N,N-methylene bisacrylamide and ammonium persulfate are used as network agents; 2, preparing hexagonal boron nitride precursor gel; 3, preparing a precursor powder body; 4, preparing a mixed precursor powder body by adding the catalyst; and 5, preparing the high-crystallinity spherical hexagonal boron nitride powder body. By the method, reaction is not required to be generated under high temperature of 1,600 DEG C to 2,100 DEG C, and the raw materials are not required to be brought into an ammonia atmosphere through nitrogen or inert gas; the process is simple; the cost is low; and impurities are difficult to introduce.

Description

technical field [0001] The invention relates to a method for preparing spherical hexagonal boron nitride powder with high crystallinity in the field of materials science. Background technique [0002] Spherical hexagonal boron nitride with high crystallinity, because of its good particle filling performance and high thermal conductivity, can be used as an inorganic filler material for thermally conductive plastics, and has broad application prospects in the fields of LED energy-saving light sources and heat dissipation components. [0003] In order to characterize the degree of three-dimensional ordering (crystallinity) of hexagonal boron nitride, the method defined by Thomas et al. is usually used to measure the degree of crystallization of hexagonal boron nitride, which is represented by the graphitization index of the degree of three-dimensional ordering , that is, the letter GI indicates that the larger the GI value, the lower the three-dimensional order of the crystal a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/064B82Y30/00
Inventor 张宁周永辉王晓阳阚洪敏付婷婷
Owner SHENYANG UNIV