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A kind of preparation method of nanometer hafnium boride powder

A technology of nano-boron and hafnium boride, applied in chemical instruments and methods, nanotechnology, inorganic chemistry, etc., can solve the problems of difficult balance between purity and particle size, high production cost, etc., achieve good shape characteristics, short production cycle, The effect of high yield

Active Publication Date: 2022-07-01
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for preparing nano hafnium boride powder in order to overcome the disadvantages of the existing technology that the hafnium boride powder is difficult to balance the purity and particle size and the production cost is high

Method used

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  • A kind of preparation method of nanometer hafnium boride powder
  • A kind of preparation method of nanometer hafnium boride powder
  • A kind of preparation method of nanometer hafnium boride powder

Examples

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Effect test

Embodiment 1

[0032] A method for preparing hafnium boride powder by co-precipitation method, comprising the following steps:

[0033] Step S1, weigh 2.0g of boric acid and 3.5g of sorbitol, put them into the same beaker and mix, then pour 10mL of acetic acid (analytical grade) into it, and use a magnetic stirrer to gradually heat up to 80°C under oil bath heating conditions, Stirring at constant temperature until boric acid and sorbitol are completely dissolved in acetic acid, and the solution is completely clarified, thereby obtaining a clear mixed solution A and cooling to room temperature;

[0034] Step S2, measure 6mL of acetic acid (analytical grade) and pour it into a beaker, weigh 3.2g of hafnium chloride and slowly pour it into it and keep stirring to obtain a pale yellow transparent mixed solution B;

[0035] Step S3, under the state of continuous stirring, the mixed solution B is slowly dropped into the mixed solution B at a uniform speed of 1 mL / min, thereby obtaining a white ha...

Embodiment 2

[0039] A method for preparing 100-gram grade hafnium boride powder by co-precipitation method, comprising the following steps:

[0040] Step S1, weigh 20g of boric acid and 35g of sorbitol, put it into the same beaker and mix, then pour 100mL of acetic acid (analytical grade) into it, and use an oil bath magnetic stirrer to gradually heat it up to 80 ° C, and stir at constant temperature until Boric acid and sorbitol are completely dissolved in acetic acid, and the solution is completely clarified, thereby obtaining a clear mixed solution A and cooling to room temperature;

[0041] Step S2, measure 80mL of acetic acid (analytical grade) and pour it into a beaker, weigh 32g of hafnium chloride and slowly pour it into it and keep stirring to obtain a pale yellow transparent mixed solution B;

[0042] Step S3, under the state of continuous stirring, the mixed solution B is slowly dripped into the mixed solution B at a uniform speed of 5mL / min, thereby obtaining a white hafnium bo...

Embodiment 3

[0046] A method for preparing hafnium boride powder by co-precipitation method, comprising the following steps:

[0047] Step S1, weigh 2.0g of boric acid and 3.8g of sorbitol, put it into the same beaker and mix, then pour 10mL of acetic acid (analytical grade) into it, and use a magnetic stirrer to gradually heat up to 60°C under oil bath heating conditions, Stirring at constant temperature until boric acid and sorbitol are completely dissolved in acetic acid, and the solution is completely clarified, thereby obtaining a clear mixed solution A and cooling to room temperature;

[0048] Step S2, measure 8mL of acetic acid (analytical grade) and pour it into a beaker, weigh 3.0g of hafnium chloride and slowly pour it into it and keep stirring to obtain a pale yellow transparent mixed solution B;

[0049] Step S3, under the state of continuous stirring, the mixed solution B is slowly dropped into the mixed solution B at a uniform speed of 1 mL / min, thereby obtaining a white hafn...

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Abstract

The invention belongs to the field of nanomaterial preparation, in particular to a method for preparing hafnium boride powder by a novel co-precipitation method. The specific process is: (1) HfCl 4 Dissolve in acetic acid to obtain transparent solution A; dissolve boric acid and D-sorbitol in acetic acid, stir until completely dissolved to obtain transparent solution B; (2) after solution B is cooled to room temperature, add A dropwise to the solution and stir , white flocs are precipitated, and the solution becomes milky white; (3) drying the sol; (4) fully grinding to obtain a white powder hafnium boride precursor; (5) calcining the hafnium boride precursor at high temperature to obtain boron Hafnium nanopowder. The preparation method of the invention has simple operation, easy control of conditions and short production period; the obtained hafnium boride powder has a particle size of nanometer scale and is uniformly distributed, has good morphological characteristics, ultra-high purity and high yield. It provides a technical basis for the engineering and industrialized preparation of high-performance, high-strength, and ultra-high temperature ceramic materials.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a method for preparing nanometer hafnium boride powder by a novel co-precipitation method. Background technique [0002] Hafnium Diboride (HfB 2 ) with hexagonal AlB 2 type layered structure, containing B atoms in 2D graphitic rings and alternately forming hexagonal tightly packed Hf layers, strong Hf–B ionic bonds and B–B covalent bonds lead to an extremely high melting point of 3250 °C It is one of the best candidate materials for hypersonic aircraft, rocket propulsion systems, cutting tools, wear-resistant coatings, molten metal crucibles, plasma arc electrodes and nuclear reactor neutron absorbers, etc. . However, the particle size of the existing commercial boride powder is tens of microns, and the product has been tested, and the purity is generally lower than 90wt%, and the development of high-purity ultra-fine and sub-micron boride ultra-high temperatu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/914B82Y40/00C04B35/56C04B35/626
CPCC01B32/914B82Y40/00C04B35/5622C04B35/62675C01P2004/62C01P2002/72C01P2002/85C01P2004/03C04B2235/3409C04B2235/444C04B2235/95
Inventor 王振黄竹林李昕扬胡晨光胡小晔李越
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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