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Hydrogen-containing metal combustion agent and preparation method thereof

A kind of incendiary and metal technology, used in offensive equipment, single substance used as explosives, explosives, etc., can solve the problems of energy release and dispersion, inability to concentrate heat release, aluminum phase is difficult to burn, etc., to increase the combustion reaction interface and activity, The effect of improving combustion performance and reducing ignition temperature

Inactive Publication Date: 2020-07-14
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the activity of aluminum-based binary alloy powder is better than that of pure aluminum, most of them undergo multiple oxidation and exothermic reactions, which makes the energy release more dispersed, and the heat release cannot be concentrated, and the aluminum phase is often difficult to burn completely.
In summary, although the development and application of aluminum-based metal combustion agents have achieved many positive results, it is still necessary to further reduce their ignition temperature and improve combustion efficiency.

Method used

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  • Hydrogen-containing metal combustion agent and preparation method thereof
  • Hydrogen-containing metal combustion agent and preparation method thereof
  • Hydrogen-containing metal combustion agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] According to the molar ratio of 2:[1 / (1-x)] (x=18%, which is the loss rate of magnesium in the smelting process), weigh aluminum flakes and magnesium strips with a purity of not less than 99.5%; use vacuum induction The smelting method is to smelt aluminum flakes and magnesium strips into alloys; mechanically crush the alloys obtained by smelting into powders with a particle size of less than 300 mesh; carry out two cycles of hydrogen absorption and desorption at 400°C (hydrogen absorption under 8 MPa hydrogen pressure for 24 hours, vacuum After dehydrogenation for 1h), absorb hydrogen for 24h under 8MPa hydrogen pressure to obtain the hydrogen-containing metal combustion agent, i.e. Al 2 Mg alloy hydride.

[0028] Depend on figure 1 a and 2 show that the resulting hydrogen-containing metal combustion agent consists of Al and MgH 2 Composed of two phases, its particles are fine, loose and porous. Depend on image 3 Visible, Al 2 Mg alloy hydrides can be ignited and...

Embodiment 2

[0030] According to the molar ratio of 3:[1 / (1-x)] (x=18%, which is the loss rate of magnesium in the smelting process), weigh aluminum sheets and magnesium strips with a purity of not less than 99.5%; use vacuum induction The smelting method is to smelt aluminum flakes and magnesium strips into alloys; mechanically pulverize the smelted alloys into powders with a particle size of less than 300 mesh; carry out two hydrogen absorption and desorption cycles at 350 ° C (8 MPa hydrogen pressure for 24 hours, vacuum After dehydrogenation for 1h), absorb hydrogen for 24h under 8MPa hydrogen pressure to obtain the hydrogen-containing metal combustion agent, i.e. Al 3 Mg alloy hydride. Depend on figure 1 b It can be seen that the resulting hydrogen-containing metal combustion agent is composed of Al and MgH 2 Two-phase composition.

Embodiment 3

[0032] According to the molar ratio of 4:[1 / (1-x)] (x=18%, which is the loss rate of magnesium in the smelting process), weigh aluminum sheets and magnesium strips with a purity of not less than 99.5%; use vacuum induction The smelting method is to smelt aluminum flakes and magnesium strips into alloys; mechanically crush the alloys obtained by smelting into powders with a particle size of less than 300 mesh; carry out two cycles of hydrogen absorption and desorption at 400°C (hydrogen absorption under 8 MPa hydrogen pressure for 24 hours, vacuum After dehydrogenation for 1h), absorb hydrogen for 24h under 8MPa hydrogen pressure to obtain the hydrogen-containing metal combustion agent, i.e. Al 4 Mg alloy hydride. Depend on figure 1 c shows that the resulting hydrogen-containing metal combustion agent consists of Al and MgH 2 Two-phase composition. Depend on Figure 5 Visible, Al 4 The ignition temperature of Mg alloy hydride is about 375°C, and the oxidation combustion re...

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Abstract

The invention discloses a hydrogen-containing metal combustion agent and a preparation method thereof, and belongs to the technical field of solid combustion agents. The combustion agent is composed of three elements of aluminum, magnesium and hydrogen, the phase composition of the combustion agent is aluminum and magnesium hydride, and the molar ratio of aluminum to magnesium hydride is 2-4:1. The preparation method comprises the following steps that firstly, metal aluminum and magnesium with the purity not lower than 99.5% are weighed according to the molar ratio of (2-4):[1 / (1-x)] (x is theburning loss rate of magnesium in the smelting process); secondly, aluminum and magnesium are smelted into alloy through adoption of a smelting method, and the alloy is mechanically smashed into powder with the particle size smaller than 300 meshes; and finally, the alloy powder is subjected to hydrogenation treatment at 350-400 DEG C under the hydrogen pressure of 8 MPa. The hydrogen-containingmetal combustion agent provided by the invention has the technical effects of low ignition temperature, high reaction activity and combustion efficiency, simple preparation process, safety, reliability and low price.

Description

technical field [0001] The invention belongs to the technical field of solid combustion agents, and in particular relates to a hydrogen-containing metal combustion agent and a preparation method thereof. Background technique [0002] Metal combustion agent is an important component of modern solid propellant, which can not only increase the energy density of propellant, but also the metal oxide solid particles generated by combustion can play a role in suppressing oscillating combustion. Aluminum powder has high volume combustion enthalpy and energy density, abundant resources and low price, and is a widely used light metal combustion agent. However, due to its low melting point and high boiling point, ordinary aluminum powder has the disadvantages of high ignition temperature, low combustion efficiency, incomplete combustion and easy agglomeration during combustion. [0003] The combustion process of aluminum powder is related to its particle size. Nano-sized aluminum powd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C06B33/00C06B49/00
CPCC06B33/00C06B49/00
Inventor 柳东明时文涛张明斯庭智李永涛张庆安
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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