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Polymer network preparation method for hexagonal boron nitride ceramic powder with high specific surface area

A hexagonal boron nitride and polymer network technology, applied in the field of inorganic non-metallic materials, can solve the problems of high cost, small specific surface area, and low purity

Inactive Publication Date: 2011-09-28
SHENYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In the above-mentioned solid-phase method, liquid-phase method, gas-phase chemical reaction method and organic precursor method, either there is a problem that the cost is high, or the purity is low or the specific surface area is small. A new method for preparing hexagonal boron nitride ceramic powder with high specific surface area is imperative

Method used

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Embodiment 1

[0016] 1. Ingredients: Use a precision electronic balance to weigh 36g of borax, 28g of urea, 10g of sucrose and 6.45g of network agent (in the network agent, 5g of acrylamide, 0.2g of N,N-methylene acrylamide, 1.25g of ammonium persulfate ),stand-by.

[0017] 2. Preparation of precursor powder: Put the above-mentioned weighed raw materials into a beaker, pour an appropriate amount of deionized water, and put the beaker in a constant temperature water bath at 70 degrees Celsius for 1 hour, stir until the gel network is formed body. Put the gel network precursor into an oven, dry it at 70 degrees Celsius for 24 hours, and then take it out, so that the gel network precursor becomes a network xerogel, ready for use. The dried network xerogel was placed in a box-type resistance furnace, heated at 300 degrees Celsius for 2 hours in an air environment, thoroughly dried, dehydrated, taken out and ground to obtain a precursor powder for use.

[0018] 3. Synthesis of hexagonal boron ...

Embodiment 2

[0021] 1. Ingredients: Weigh 19g of borax, 12g of urea, 6.5g of sucrose and 4.225g of network agent (in the network agent, 3.3g of acrylamide, 0.15g of N,N-methylene acrylamide, ammonium persulfate 0.8g), set aside.

[0022] 2. Preparation of precursor powder: Put the above-mentioned weighed raw materials into a beaker, pour an appropriate amount of deionized water, and put the beaker in a constant temperature water bath at 70 degrees Celsius for 1 hour, stir until the gel network is formed body. Put the gel network precursor into an oven, dry it at 70 degrees Celsius for 24 hours, and then take it out, so that the gel network precursor becomes a network xerogel, ready for use. The dried network xerogel was placed in a box-type resistance furnace, heated at 300 degrees Celsius for 2 hours in an air environment, thoroughly dried, dehydrated, taken out and ground to obtain a precursor powder for use.

[0023] 3. Synthesis of hexagonal boron nitride: Put the above-mentioned pre...

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Abstract

The invention relates to a polymer network preparation method for high-specific-surface hexagonal boron nitride ceramic powder, and the method comprises the following steps: (1) proportioning; (2) preparing precursor powder; (3) synthesizing hexagonal boron nitride; and (4) carrying out purification treatment. The obtained hexagonal boron nitride ceramic powder has the advantages of low cost, high purity and large specific surface area.

Description

technical field [0001] The invention relates to a method for preparing hexagonal boron nitride ceramic powder in the field of inorganic non-metallic materials, in particular to a method for preparing a polymer network of hexagonal boron nitride ceramic powder with high purity and high specific surface area. technical background [0002] The preparation methods of hexagonal boron nitride ceramic powder mainly include solid phase method, liquid phase method, gas phase chemical reaction method and organic precursor method. [0003] The solid-phase method is a traditional industrial method for preparing hexagonal boron nitride ceramic powder. Its basic principle is to mix anhydrous borax with urea or ammonium chloride, and heat the reaction under an ammonia atmosphere to prepare hexagonal boron nitride. Ceramic powder, this method can realize continuous production. [0004] The liquid phase method, also known as the hydrothermal synthesis method, referred to as the hydrothermal...

Claims

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Application Information

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IPC IPC(8): C04B35/5833C04B35/626
Inventor 张宁姚璞玉崔行宇王晓阳阚洪敏
Owner SHENYANG UNIV
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