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A way to increase alpha-alh 3 thermal stability method

A thermal stability, -alh3 technology, applied in the direction of explosives, etc., can solve problems such as decomposition phenomena, achieve low decomposition rate, improve thermal stability, and good thermal stability

Active Publication Date: 2021-12-21
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, currently α-AlH 3 Applied to solid propellants, it is also necessary to solve the decomposition phenomenon in the range of room temperature and solid propellant process temperature

Method used

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  • A way to increase alpha-alh <sub>3</sub> thermal stability method

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Embodiment 1

[0031] This embodiment discloses a method to improve α-AlH 3 Thermal stability methods, including for α-AlH 3 Carry out pickling treatment, and then use carbazole group-containing polymer to coat the pickled α-AlH 3 to increase α-AlH 3 thermal stability.

[0032] Pickling treatment includes α-AlH 3 Add to the acid solution and stir, filter, wash and dry in turn to obtain α-AlH 3 / Al 2 o 3 .

[0033] α-AlH coated with carbazole group-containing polymer after pickling 3 Specifically include: dissolving the polymer containing carbazole group in an organic solvent to obtain a polymer solution system, and then pickling the α-AlH 3 Soaking in said polymer solution system, stirring, filtering, washing and drying.

[0034] The carbazole-containing polymer is a single polyvinylcarbazole, poly(9-vinylcarbazole), poly(n-vinylcarbazole) and poly(N-ethyl-2-vinylcarbazole) components or mixed components.

[0035] In this embodiment, the acid solution is dilute hydrochloric acid, ...

Embodiment 2

[0041] Same as Example 1, the difference is poly(9-vinylcarbazole) and α-AlH 3 The mass ratio is 1:5, and the volume fraction of dilute hydrochloric acid solution is 8%.

Embodiment 3

[0043] (1) Prepare a dilute hydrochloric acid solution with a volume fraction of 5%; take the α-AlH synthesized by the wet method 3 It was added to dilute hydrochloric acid solution, stirred and filtered, washed with ethanol three times, and finally freeze-dried to obtain an off-white powder sample, namely α-AlH 3 / Al 2 O 3 .

[0044] (2) Disperse 200mg of poly(N-ethyl-2-vinylcarbazole) in chloroform solvent, stir to dissolve; then take 500mgα-AlH 3 / Al 2 O 3 Add it, stir and disperse for 2h-6h, filter and wash with chloroform three times, and finally freeze-dry to obtain a gray-white powder sample, namely α-AlH 3 / Al 2 O 3 / PVK. The stirring speed is 200 to 1000 rpm.

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Abstract

The invention discloses a method for improving α-AlH 3 Thermal stability methods, including for α-AlH 3 pickling treatment, and then coating the pickled α-AlH with a polymer containing carbazole groups 3 to increase α‑AlH 3 thermal stability. Described polymer containing carbazole group is polyvinylcarbazole, poly(9-vinylcarbazole), poly(n-vinylcarbazole) and poly(N-ethyl-2-vinylcarbazole) single or mixed components. Improve α-AlH in the present invention 3 The thermal stability method further improves α-AlH on the basis of pickling 3 Thermal stability, α-AlH treated by this method 3 It has lower decomposition rate and improved thermal stability. It can be used as solid propellant fuel, and the treatment process of the method is carried out at normal temperature, which is safe and reliable, and is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of energetic materials, and in particular relates to a method for improving the thermal stability of α-AlH3. Background technique [0002] The introduction of hydrogen during the combustion of solid propellants can effectively reduce the average relative molecular mass of the gas; at the same time, the high combustion calorific value of hydrogen helps to increase the temperature of the combustion chamber and increase the specific impulse. Aluminum hydride is a light metal hydride with a relatively high hydrogen content, with a hydrogen content of 10.08%, and a hydrogen storage density of 148g / L, which is twice that of liquid hydrogen (70.8g / L). Compared with aluminum powder, With higher combustion calorific value, it is an ideal solid propellant fuel. Currently, AlH 3 There are a total of 7 different crystal forms including: α, α′, β, γ, δ, ε, and ζ. Among them, the α crystal form has relatively stable thermodynamic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C06B45/34C06B27/00
CPCC06B45/34C06B27/00
Inventor 蒋周峰赵凤起安亭杨燕京李辉张明张建侃姜一帆李娜
Owner XIAN MODERN CHEM RES INST
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