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Boron magnesium prealloy powder material, and preparation method thereof

A technology of pre-alloyed powder and bulk material, applied in the field of metal-based combustibles, can solve the problems of reducing the exothermic heat of oxidation reaction, increasing the active boron content, reducing the reactivity of boron powder, etc. Reduce the effect of agglomeration

Active Publication Date: 2018-02-23
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Boron powder has a very high calorific value, its mass calorific value is 2.3 times and 1.9 times that of magnesium and aluminum respectively, and the burning rate is appropriate, but boron powder is easily oxidized, which greatly reduces the combustion process after it is added to the propellant. The exothermic heat of the oxidation reaction, and the melting and boiling points of the boron oxide shell are very high, covering the surface of the boron powder, making it difficult for the boron powder inside to react during the combustion process, further reducing the reactivity of the boron powder
In addition, boron particles are easy to agglomerate, resulting in a large particle size, which is not conducive to its full reaction.
At present, boron powder is mechanically mixed with magnesium powder to add magnesium powder to the boron powder system to improve its ignition performance and increase the reactivity of the system, but the addition of magnesium powder cannot increase the content of active boron

Method used

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  • Boron magnesium prealloy powder material, and preparation method thereof
  • Boron magnesium prealloy powder material, and preparation method thereof
  • Boron magnesium prealloy powder material, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Pretreatment: put boron powder in absolute ethanol (B:C 2 h 5 OH=1g:4mL) soaked for 12h, filtered with suction, and dried in vacuum.

[0039] (2) Mechanical premixing: Weigh atomized magnesium powder and pretreated boron powder at a molar ratio of 1:4, stir in a vacuum planetary mixer, and then add them to a three-dimensional mixer for premixing for 1 hour to obtain a mixed powder .

[0040] (3) High-temperature uniform premixing: put the mixed powder in a stainless steel crucible, put it into a tube furnace, evacuate to 500Pa, keep the pressure for 1h, and then fill it with high-purity argon to 2000Pa. Afterwards, high-temperature uniform premixing is carried out, the heating rate is 10°C / min, the sintering temperature is 600°C, and the temperature is kept for 3 hours. After cooling to below 50°C with the furnace, the sintered block is taken out and put into an ultrafine pulverizer under the protection of high-purity argon. Under mechanical crushing and grinding...

Embodiment 2

[0048] (1) Pretreatment: Put boron powder in ethyl acetate (B:C 4 h 8 o 2 =1g:6mL) soaked for 24h, filtered with suction, and dried in vacuum.

[0049] (2) Uniform premixing: Weigh the atomized magnesium powder and pretreated boron powder at a molar ratio of 1:7, add them to a three-dimensional mixer for premixing for 2 hours after mechanical stirring, and obtain mixed powder.

[0050] (3) High-temperature uniform premixing: put the mixed powder in a stainless steel crucible, put it into the tube furnace again, evacuate to 500Pa, keep the pressure for 3 hours, and then fill it with high-purity argon to 1000Pa. Afterwards, high-temperature uniform premixing is carried out, the heating rate is 15°C / min, the sintering temperature is 650°C, and the temperature is kept for 2 hours. After cooling in the furnace to below 50°C, the sintered block is taken out and put into an ultrafine pulverizer under the protection of high-purity argon. Under mechanical crushing and grinding, a part...

Embodiment 3

[0057] (1) Pretreatment: Put boron powder in acetone (B:CH 3 COCH 3 =1g:8mL) soaked for 48h, suction filtered, and vacuum-dried.

[0058] (2) Uniform premixing: Weigh the atomized magnesium powder and pretreated boron powder at a molar ratio of 1:9, add them to a three-dimensional mixer for premixing for 3 hours after mechanical stirring, and obtain mixed powder.

[0059] (3) High-temperature uniform premixing: put the mixed powder in a stainless steel crucible, put it into a tube furnace, evacuate to 500Pa, hold the pressure for 5h, and then fill it with high-purity argon to 500Pa. Afterwards, high-temperature uniform premixing is carried out, the heating rate is 20°C / min, the sintering temperature is 700°C, and the temperature is kept for 1 hour. After cooling to below 50°C with the furnace, the sintered block is taken out and put into an ultrafine pulverizer under the protection of high-purity argon. Under mechanical crushing and grinding, a part of pre-alloyed powder is ...

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Abstract

The invention relates to a preparation method of a boron magnesium prealloy powder material, and belongs to the field of metal based combustible matter. The boron magnesium prealloy powder material isof a totally encapsulated type core-shell structure; B is taken as the core; the shell is composed of MgO and MgB2; amorphous form MgO and crystalline state MgB2 are nonuniformly distributed. The preparation method comprises following steps: magnesium powder and boron powder are subjected to pretreatment and mechanical premixing so as to obtain a mixed powder, the mixed powder is subjected to high temperature uniform pre-mixing, is taken out from a furnace, is smashed and grinded under the protection of an inert gas, and then is introduced into the furnace again; vacuuming is carried out, inert gas is introduced, and two-step sintering is carried out; an obtained prealloy powder block is subjected to mechanical smashing grinding under the protection of inert gas so as to obtain the boronmagnesium prealloy powder material. The preparation method is simple; cost is low; reduction of boron oxide in boron powder is realized with magnesium powder in heating process so as to increase the content of effective boron; a part of boron magnesium alloy is formed on interfaces among boron particles, so that boron agglomeration is reduced, heating area of boron particles in oxidation process is enlarged, and the degree of reaction is increased.

Description

technical field [0001] The invention relates to a boron-magnesium pre-alloyed powder material and a preparation method thereof, belonging to the field of metal-based combustibles. Background technique [0002] Boron powder has a very high calorific value, its mass calorific value is 2.3 times and 1.9 times that of magnesium and aluminum respectively, and the burning rate is appropriate, but boron powder is easily oxidized, which greatly reduces the combustion process after it is added to the propellant. The exothermic heat of the oxidation reaction and the high melting and boiling points of the boron oxide shell cover the surface of the boron powder, making it difficult for the boron powder inside to react during the combustion process, further reducing the reactivity of the boron powder. In addition, boron particles are easy to agglomerate, resulting in a large particle size, which is not conducive to its full reaction. At present, boron powder is mechanically mixed with m...

Claims

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Application Information

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IPC IPC(8): C06B33/00C06B21/00
CPCC06B21/0083C06B33/00
Inventor 焦清介刘大志闫石杜风贞孙亚伦
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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