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Method for improving thermal stability of alpha-AlH3

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: 2020-11-10
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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  • Method for improving thermal stability of alpha-AlH3
  • Method for improving thermal stability of alpha-AlH3
  • Method for improving thermal stability of alpha-AlH3

Examples

Experimental program
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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 polymer containing carbazole group is a single one of 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 hydro...

Embodiment 2

[0041] Same as Example 1, the difference is that 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) configuration volume fraction is the dilute hydrochloric acid solution of 5%; Get the α-AlH of wet method synthesis 3 Add dilute hydrochloric acid solution, stir and filter, wash with ethanol three times, and finally freeze-dry to obtain off-white powder sample, that is, α-AlH 3 / Al 2 o 3 .

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

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Abstract

The invention discloses a method for improving the thermal stability of alpha-AlH3, which comprises the following steps: carrying out acid pickling treatment on alpha-AlH3, and coating the acid-pickled alpha-AlH3 with a carbazole group-containing polymer to improve the thermal stability of alpha-AlH3; wherein the carbazole group-containing polymer is a single component or a mixed component of polyvinyl carbazole, poly(9-vinylcarbazole), poly(n-vinylcarbazole) and poly(N-ethyl-2-vinylcarbazole). According to the method for improving the thermal stability of the alphaAlH3, the thermal stabilityof the alpha-AlH3 is further improved on the basis of acid pickling, the alpha-AlH3 treated by the method has a lower decomposition rate, and the thermal stability is improved. The product can serve as a solid propellant fuel. The method is carried out at normal temperature and is safe, reliable and 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, 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 propertie...

Claims

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Application Information

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Patent Type & Authority Applications(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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