Method for preparing spherical amorphous boron powder by spray drying method

An amorphous boron powder, spray drying technology, applied in chemical instruments and methods, inorganic chemistry, boron compounds, etc., can solve the problem of no spherical amorphous boron powder patents and reports, etc., to achieve a short preparation period, the method is simple and easy Excellent effect of line and sphericity
CN101734680AInactive Publication Date: 2010-06-16WUHAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WUHAN UNIV OF TECH
Publication Date
2010-06-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for preparing spherical amorphous boron powder by a spray drying method, which is characterized by comprising the following steps of: (1) pulping: evenly mixing boron powder and distilled water according to the mass ratio of 30:70 to 40:60, adding additive based on 2-6 percent of the boron powder, firstly, performing ultrasonic dispersion for 15-30 minutes and then stirring magnetically for 15-30 minutes to obtain the boron powder pulp, adding sodium hydroxide solution in the boron powder pulp and adjusting the pH value of the boron powder pulp to 9-12 to obtain the boron powder pulp after adjusting the pH value; (2) spray drying: performing spray drying on the boron powder pulp after adjusting the pH value in the step (1) with a spray dryer; and (3) vacuum drying: placing the spherical boron powder obtained in the step (2) in a vacuum drying box, and drying for 1-2 hours at 70-90 DEG C to obtain the spherical amorphous boron powder. The method is simple and easy to operate, and the spherical amorphous boron powder prepared by the method has excellent sphericity, high boron content and small grain size.
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Description

technical field

[0001] The invention relates to a preparation method of spherical amorphous boron powder. Background technique

[0002] Boron is the preferred energetic material in solid propellants due to its high mass calorific value and volume calorific value.

[0003] The melting point and boiling point of elemental boron are relatively high, which is difficult to melt and gasify; the boiling point of boron oxide is also very high, which determines that the temperature is very high to make boron particles ignite and burn, and the combustion process has to go through B 2 o 3 The evaporation of the oxide layer further increases the difficulty of boron particle ignition and combustion. Boron has low combustion efficiency, high oxygen consumption, and produces a lot of residues, which cannot exert its high-energy calorific value; there is B on the surface of boron 2 o 3 、H 3 BO 3 Such impurities make boron incompatible with hydroxyl-terminated polybutadiene (HTPB) in b...

Claims

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