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Nano mesoporous magnesium aluminate material and preparation method thereof

A kind of mesoporous magnesium aluminate and nanotechnology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of easy melting and condensation of solid propellants, incomplete combustion, performance loss, etc., to achieve easy control of preparation parameters, improve performance, The effect of high surface area

Active Publication Date: 2014-11-05
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of these nano-metal powders requires complex equipment and high cost
In addition, when these metal powders are burned, they are easy to melt and condense, causing the solid propellant to not burn completely, resulting in performance loss

Method used

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  • Nano mesoporous magnesium aluminate material and preparation method thereof
  • Nano mesoporous magnesium aluminate material and preparation method thereof
  • Nano mesoporous magnesium aluminate material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] According to the stoichiometric ratio of the molar ratio of magnesium and aluminum ions being 1:2, weigh magnesium nitrate and aluminum nitrate, dissolve them in deionized water, stir continuously to dissolve them fully, and add citric acid after forming a clear solution to make citric acid and The molar ratio of metal ions is 1.5:1. Use ammonia water to adjust the pH value of the solution to 5, and then heat and evaporate at 70°C to remove water to form a yellow viscous gel. After the water in the gel is evaporated to dryness, move it to a constant temperature oven Heated at 120°C for 6 hours to obtain a fluffy yellow xerogel; grind the xerogel in a mortar, put it in a tube furnace, and set it under N 2 In the atmosphere, calcining at 700° C. for 3 hours to obtain black powder; calcining the obtained black powder in air atmosphere at 700° C. for 2 hours to obtain white nanometer mesoporous magnesium aluminate powder. Its X-ray diffraction analysis (XRD) pattern is as f...

Embodiment 2

[0033] According to the stoichiometric ratio of the molar ratio of magnesium and aluminum ions being 1:2, weigh magnesium nitrate and aluminum nitrate, dissolve them in deionized water, stir continuously to dissolve them fully, and add citric acid after forming a clear solution to make citric acid and The molar ratio of metal ions is 2:1, the pH value of the solution is adjusted to 2 with ammonia water, and then heated and evaporated at 80°C to remove water to form a yellow viscous gel. After the water in the gel is evaporated to dryness, move it to a constant temperature oven Heated at 150°C for 3 hours to obtain a fluffy yellow xerogel; ground the xerogel in a mortar, put it in a tube furnace, and heated it under N 2 Calcining at 800° C. for 0.5 hour in the atmosphere to obtain black powder; calcining the obtained black powder at 600° C. for 1 hour in air atmosphere to obtain white nanometer mesoporous magnesium aluminate powder. The X-ray diffraction analysis results show t...

Embodiment 3

[0035] According to the stoichiometric ratio of the molar ratio of magnesium and aluminum ions being 1:2, weigh magnesium acetate and aluminum nitrate, dissolve them in deionized water, stir continuously to dissolve them fully, and add citric acid after forming a clear solution to make citric acid and The molar ratio of metal ions is 2.5:1. Use ammonia water to adjust the pH value of the solution to 3, and then heat and evaporate at 100°C to remove water to form a yellow viscous gel. After the water in the gel is evaporated to dryness, move it to a constant temperature oven Heated at 160°C for 2 hours to obtain a fluffy yellow xerogel; grind the xerogel in a mortar, put it in a tube furnace, and set it under N 2 In the atmosphere, calcining at 900° C. for 0.5 hours to obtain black powder; calcining the obtained black powder in air atmosphere at 500° C. for 2 hours to obtain white nanometer mesoporous magnesium aluminate powder. The X-ray diffraction analysis results show that ...

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Abstract

The invention discloses a nano mesoporous magnesium aluminate material and a preparation method thereof. The nano mesoporous magnesium aluminate material has the grain size of 3-20nm, the specific surface area of 90-300m<2> / g, and the most probable pore diameter of 2-10nm. The preparation method comprises the following steps of: (1) dissolving initiative materials, namely magnesium salt and aluminum nitrate in water to obtain metal ion mixed solution in which the molar ratio of magnesium ions to aluminum ions is 1:2, fully mixing uniformly, adding citric acid, ensuring that the molar ratio of the citric acid to the metal ions is (1.5-2.5):1, and obtaining a complex by using the citric acid as a complexing agent; (2) regulating the PH value of the solution to be 2-5, heating, and evaporating to remove water at the temperature of between 70 and 100 DEG C so as to form gel; (3) evaporating all water in the gel obtained in the step (2), heating and drying at the temperature of between 120 and 160DEG C for 2 to 6 hours in a constant temperature oven to obtain dried gel; (4) grinding the dried gel obtained in the step (3), and calcining at the temperature of between 700 and 900DEG C for 0.5 to 3 hours in the atmosphere of N2 to obtain black powder; and (5) calcining the black powder obtained in the step (4) at the temperature of between 500 and 900DEG C for 1 to 2 hours in the atmosphere of air to obtain the nano mesoporous magnesium aluminate material. The nano mesoporous magnesium aluminate material can be used as a catalyst for improving performance of a solid propellant.

Description

technical field [0001] The invention relates to a nanometer mesoporous magnesium aluminate material in the field of high-energy solid propellants and a preparation method thereof. Background technique [0002] Ammonium perchlorate is a high-energy oxidant commonly used in solid propellants used in rocket engines, and its thermal decomposition characteristics have an important impact on the comprehensive performance of solid propellants. In order to improve the burning rate of solid propellant, it is necessary to reduce the thermal decomposition reaction temperature of ammonium perchlorate. In order to increase the energy level of the propellant, a catalyst can be added to the propellant formula, which can release a large amount of heat when the propellant burns, so as to increase the combustion temperature and obtain high specific impulse and characteristic velocity. At present, nanomaterials have important applications in the field of solid propellant catalysis due to thei...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02B01J21/10
Inventor 关翔锋李广社李莉萍
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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