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Nanometer thermite and preparing method thereof

A technology of nano-aluminum and thermite, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of long time, low product energy density, high cost, etc., and achieve the improvement of reaction rate, The effect of convenient post-processing and short preparation cycle

Inactive Publication Date: 2015-12-23
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Document 1: The ultrasonic physical mixing method is difficult to be compatible with the MEMS preparation process, and because the nanoparticles have high surface energy, the particles are easily agglomerated during the ultrasonic mixing process
In addition, it is difficult for nano-aluminum powder and nano-oxide to be fully contacted by ultrasound, which will seriously affect the reactivity of nano-thermite.
[0010] Document 2: In the process of preparing nano thermite, a large amount of organic solvent is used, so organic impurities are inevitably introduced, resulting in a decrease in the energy density of the product
In addition, the sol-gel process takes a long time, which is not conducive to large-scale industrial production
[0011] Document 3: The physical vapor deposition process is time-consuming, labor-intensive, costly, and narrowly applicable
[0012] Document 4: The self-assembly method is not compatible with MEMS manufacturing technology, and the cost is high, and polymers are used in the preparation process, which will inevitably reduce the energy density of nano thermite

Method used

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  • Nanometer thermite and preparing method thereof
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  • Nanometer thermite and preparing method thereof

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preparation example Construction

[0038] combine figure 2 , the preparation method of nano thermite of the present invention, comprises the steps:

[0039] Step 1: Prepare PS polymer microspheres, the diameter of the PS polymer microspheres is 20-600nm, and then use deionized water to prepare a PS polymer microsphere dispersion, and the concentration of the PS polymer microsphere dispersion 1~25wt%;

[0040] Step 2: vertically immerse the substrate in the PS polymer microsphere dispersion prepared in step 1, and use the curved liquid surface formed by solvent evaporation to perform directional alignment and self-assembly of PS polymer microspheres to form a colloidal crystal template;

[0041] Step 3: Prepare the nanocomposite metal oxide precursor; including the following two nanocomposite metal oxide precursors, as follows:

[0042] (1) Preparation of nanocomposite metal oxide precursor, wherein the nanocomposite metal oxide is CoFe 2 o 4 , the preparation process of the precursor solution is as follows...

example 1

[0048] Step 1: Prepare PS polymer microspheres with smooth surface, good dispersibility and particle size of 300nm, and then use deionized water to prepare a dispersion of PS polymer microspheres with a concentration of 1.5wt%;

[0049] Step 2: vertically immerse the substrate in the PS polymer microsphere dispersion prepared in step 1, and use the curved liquid surface formed by solvent evaporation to perform directional alignment and self-assembly of PS polymer microspheres to form a colloidal crystal template;

[0050] Step 3: Accurately weigh 24.24gFe(NO 3 ) 3 9H 2 O and 8.73gCo(NO 3 ) 2 ·6H 2 0, then add 20mL methanol and 40mL ethylene glycol, and obtain the nanocomposite metal oxide precursor solution with magnetic stirring for 9h;

[0051] Step 4: Put the PS colloidal crystal template in step 2 into the precursor solution prepared in step 4, take it out after soaking for 3 to 5 minutes, and remove the excess precursor solution, then transfer it to an oven and dry i...

example 2

[0058] Step 1: Prepare PS polymer microspheres with smooth surface, good dispersibility and particle size of 20nm, and then prepare a dispersion of PS polymer microspheres with a concentration of 1.5 wt% with deionized water;

[0059] Step 2: vertically immerse the substrate in the PS polymer microsphere dispersion prepared in step 1, and use the curved liquid surface formed by solvent evaporation to perform directional alignment and self-assembly of PS polymer microspheres to form a colloidal crystal template;

[0060] Step 3: Accurately weigh 24.24gFe(NO 3 ) 3 9H 2 O and 8.73gCo(NO 3 ) 2 ·6H 2 0, then add 20mL methanol and 40mL ethylene glycol, and obtain the nanocomposite metal oxide precursor solution with magnetic stirring for 9h;

[0061] Step 4: Put the PS colloidal crystal template in step 2 into the precursor solution prepared in step 4, take it out after soaking for 3-5 minutes, and remove the excess precursor solution, then transfer it to an oven and dry it at ...

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Abstract

The invention discloses nanometer thermite and a preparing method thereof. The preparing method comprises the specific steps that a substrate is vertically immersed in PS macromolecule micro-ball dispersion liquid, and directional arrangement of PS macromolecule micro-balls is carried out through a bent liquid level formed through solvent evaporation for self-assembling to form a colloidal crystal template; nano-composite metal oxide precursor is prepared; the PS colloidal crystal template is placed in the prepared precursor and immersed for 3-5 min to be taken out, and then the colloidal crystal template is transferred into an oven to be dried to obtain a PS / precursor composite film; the PS / precursor composite film is placed in a muffle furnace for program temperature rising roasting, and after the PS colloidal crystal template is removed, three-dimensional orderly macropore nano-composite metal oxide is generated; and aluminum is deposited in a duct of the nano-composite metal oxide through a magnetron sputtering method, and the nanometer thermite with the substrate loaded with the nano-composite metal oxide thermit film is obtained. The operation is easy, and the nanometer thermite with the beneficial effects of being high in energy density, small in three-dimensional scale, capable of achieving compatibility between the preparing technology and the MEMS manufacturing technology and the like can be prepared under the mild condition.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite energetic materials, in particular to several nanometer thermites and preparation methods thereof. Background technique [0002] MEMS (Micro Electro-mechanical System) pyrotechnics refers to pyrotechnics technology based on MEMS technology or compatible with MEMS technology. It not only has the functions of traditional pyrotechnics such as control, work, ignition, The advantages of digitalization and intelligence can better meet the application of future pyrotechnic systems in aerospace, ammunition, and medical treatment. However, with the continuous reduction of the size of MEMS chips, the output energy of pyrotechnic devices is becoming more and more difficult to meet the ignition requirements of some devices, which makes the problem of ignition reliability increasingly prominent. Nanocomposite energetic materials have the advantages of high energy density, fast energy release rate, and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/35C23C14/16B82Y30/00B82Y40/00
Inventor 张文超程佳秦志春焦阳叶家海田桂蓉
Owner NANJING UNIV OF SCI & TECH
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