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Application and preparation method of nanometer metal composite oxide bismuth tungstate

A technology of composite oxides and nano-metals, applied in the field of nano-materials, can solve problems such as poor compatibility of propellant components, poor chemical stability, and environmental pollution by lead elements, so as to reduce the pressure index, facilitate industrial production, and synthesize The effect of simple method

Active Publication Date: 2017-03-15
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary metal oxides have problems such as poor chemical stability, poor compatibility with propellant components, and uneven dispersion during use, which limit their application and require complex surface modification treatments, etc.
At the same time, the extensive use of lead elements seriously pollutes the environment

Method used

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  • Application and preparation method of nanometer metal composite oxide bismuth tungstate
  • Application and preparation method of nanometer metal composite oxide bismuth tungstate
  • Application and preparation method of nanometer metal composite oxide bismuth tungstate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Utilize commercially available nanometer metal composite oxide bismuth tungstate, particle diameter 50~100nm, add in the solid double-base propellant of main body with nitrocellulose / nitroglycerin with 2% addition amount, carry out propellant burning rate measurement, the result It shows that it has a catalytic combustion effect.

Embodiment 2

[0037] 5mmol (2.43g) Bi(NO 3 ) 3 ·5H 2 O and 2.5mmol (0.824g) NaWO 4 2H 2 O was dissolved in 20 mL of 10% dilute nitric acid solution and 20 mL of deionized water respectively, and the two solutions were mixed and stirred for 30 min; after mixing evenly, the pH was adjusted to 11 with 10% NaOH solution, and the solution became a suspension For the turbid solution, continue to stir for 1 hour; transfer the suspension to a 50mL autoclave and place it in a constant temperature drying oven at 160°C for 20 hours; centrifuge the precipitate obtained after the reaction, wash it with distilled water and ethanol, and dry it in vacuum at 80°C to obtain the target The product is bismuth tungstate. Yield 84%.

[0038] figure 1 It is the XRD spectrum of the bismuth tungstate of the present invention, and the XRD results show that the crystal phase of the nanocomposite metal oxide bismuth tungstate has a high purity and belongs to the orthorhombic tungstobismuth mineral structure (JCP...

Embodiment 3

[0041] The nano-metal composite oxide bismuth tungstate synthesized by the method in Example 1 is added to the nitrocellulose / nitroglycerin solid double-base propellant and the nitrocellulose / nitroglycerin modified double-base propellant respectively with an additional amount of 2%. In the propellant, the DSC measurement was carried out to obtain image 3 The results shown show that the decomposition peak temperatures of solid double-base and modified double-base propellants added with nano-metal composite oxide bismuth tungstate are 202.0°C and 206.0°C, respectively, and the total heat release is 1603J / g and 1254J / g, respectively. High heat.

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Abstract

The invention relates to the application and preparation method of nanometer metal composite oxide bismuth tungstate. The application involved is the application of the nanometer metal composite oxide bismuth tungstate as a combustion catalyst of a solid double-base propellant or a solid-modified double-base propellant. The involved preparation method is that the mixed solution of bismuth nitrate and sodium tungstate with a pH of 11-12 is hydrothermally reacted at 160-180 DEG C to prepare nano-metal composite oxide bismuth tungstate. The nano-metal composite oxide bismuth tungstate is a new type of green combustion catalyst, which can realize rapid and steady-state combustion of solid propellants, significantly reduce the pressure index, and form a special high-pressure "platform combustion". The synthesis method of the invention is simple, easy for industrialized production, and the particle size distribution of the product is uniform.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to the application of a novel combustion catalyst for solid double-base propellant--a nanometer metal composite oxide bismuth tungstate and a preparation method of the material. Background technique [0002] Propellant is an important research field in military and aerospace technology. At present, solid propellants are developing in the direction of high energy, insensitivity, low characteristic signal, and environmental protection. Combustion catalysts are the compounds that regulate the combustion rate and pressure index of solid propellants. Therefore, continuous research on new high-efficiency combustion catalysts, widening the range of combustion rates of solid propellants, and reducing the pressure index have always been important issues that researchers at home and abroad are concerned about. . [0003] Combustion catalysts commonly used in solid propella...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C06D5/06C01G41/00
Inventor 徐抗震任兆玉张钰黄洁高红旭张玩涛赵凤起宋纪蓉
Owner NORTHWEST UNIV
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