A preparation method of high-density copper azide with constrained shell

A copper azide, high-density technology, applied in the field of pyrotechnics, can solve the problems of weakened detonation ability, failure to meet the requirements of high-density primary explosives for MEMS fuzes, and low product density, and achieve low equipment requirements and safe preparation processes Green and pollution-free, simple preparation equipment

Active Publication Date: 2022-02-08
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0004] Therefore, the nanoporous metal prepared by the hydrogen bubble template method has pores in the tens of microns and a loose microstructure, which leads to the low density of the product generated by the azidation reaction, which greatly weakens the detonation ability, and cannot achieve the high density detonation required in the MEMS fuze. medicine request

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  • A preparation method of high-density copper azide with constrained shell
  • A preparation method of high-density copper azide with constrained shell
  • A preparation method of high-density copper azide with constrained shell

Examples

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Embodiment 1

[0078] Example 1: Preparation of high-density copper-containing azide with constrained shell

[0079] Take 2g of oxalic acid and 1g of copper nitrate and grind them for 60min, put them in a tube furnace, raise the temperature to 550°C under the protection of nitrogen, keep it warm for 150min, and get nanoporous copper after cooling. figure 1 The SEM characterization figure of the nanoporous copper prepared for this embodiment, by figure 1 It can be seen that the nanoporous copper particles are uniform, the particle size is about 100nm, and there are a lot of pores. figure 2 The XRD characterization pattern of the nanoporous copper prepared for this example completely matches the standard pattern of copper (JCPDS No. 04-0836), without any impurity peaks, indicating that the final product is pure copper.

[0080] Transfer nanoporous copper into a confinement shell with a thickness of 0.4mm and a through hole diameter of 0.8mm. The density of nanoporous copper in the confinem...

Embodiment 2

[0081] Example 2: Preparation of high-density copper-containing azide with constrained shell

[0082] Dissolve 1g of oxalic acid and 0.5g of copper nitrate in 10mL of absolute ethanol respectively, mix the two solutions for 30 minutes, remove the solvent by centrifugation or filtration, dry the solid or directly raise the temperature to 450°C under the protection of nitrogen and keep it warm for 120 minutes, then cool After obtaining nanoporous copper;

[0083] Transfer nanoporous copper into a confinement shell with a thickness of 0.4mm and a through hole diameter of 0.8mm. The density of nanoporous copper in the confinement shell is about 1.5g / cm 3 .

[0084] The nanoporous copper monolith with a constrained shell was placed in a reactor for gas-solid in-situ chemical reaction with azide gas for 24 hours. After the reaction, the packing density of the bound shell is about 2.3g / cm 3 The mass of copper azide in this single confined shell is about 0.46mg.

[0085] Figure ...

Embodiment 3

[0086] Example 3: Preparation of high-density copper-containing azide with constrained shell

[0087] Dissolve 2 g of oxalic acid and 1 g of copper nitrate in 10 mL of anhydrous methanol respectively. After the two solutions are mixed, slowly evaporate the solvent to dryness. nanoporous copper oxide, Figure 7 The XRD spectrum characterization figure of the nanoporous copper oxide prepared for this example, the peaks at 35.46°, 38.64° and 48.70° in the spectrum correspond to (11-1), (111) and (20-2 ) crystal plane, the peaks in all spectra are completely matched with the peak positions in the CuO standard card (JCPDS No.48-1548), and there are no impurity peaks, indicating that copper oxalate solid powder can be sintered in air to obtain pure CuO. Transfer nanoporous copper oxide into a confinement shell with a thickness of 0.4mm and a diameter of 0.8mm, and the density of nanoporous copper in the confinement shell is about 1.6g / cm 3 . And placed in the reactor to carry ou...

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Abstract

The invention relates to a preparation method of a high-density copper azide with a constrained shell, which belongs to the field of pyrotechnics. Store nanoporous copper or nanoporous copper oxide in a constrained shell, and prepare copper azide with high density through gas-solid in-situ chemical reaction with azide gas before use; avoid during operation Eliminates the dangers of traditional primary explosive production, transportation and post-pressurization. The prepared copper azide in the restrained shell has a high packing density, no danger in the filling process, safe transportation and storage, high detonation power, and a single-shot restrained shell. The dose of copper azide belongs to the sub-milligram level, and the preparation process is green and pollution-free. Adopting the method of the present invention can make packing density 1.4~3.2g / cm 3 High-density copper azide, the prepared high-density copper azide in the confined shell can detonate HNS-IV with a packing density of 75%-92% of the theoretical density and a diameter of ≥0.5mm when the dosage of the high-density copper azide in the confined shell is ≥0.4mg , CL‑20, PETN and RDX and other explosives and ignition of B / KNO 3 Wait for the gunpowder.

Description

technical field [0001] The invention relates to a preparation method of a high-density copper azide with a constrained shell, belonging to the field of pyrotechnics. Background technique [0002] The copper azide primary explosives reported in the literature are mainly synthesized by the liquid phase method, and the packing density of the prepared copper azide primary explosives is low, which cannot be safely used in MEME fuzes and civilian detonators. [0003] At present, a large number of literatures have reported that in the method of preparing metal azide micro-charges by in-situ gas-curing chemical reaction, the precursor nanoporous metal is mainly prepared by the hydrogen bubble template method and the metal salt pyrolysis method. Zhang Fang et al. (Zhang Fang, Wang Yanlan, Bai Yingwei, et al.Preparation and characterization of copperazide nanowire array[J].Materials Letters,2012,89:176-179) prepared Cu nanowires by electrodeposition using AAO templates, and then Comb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/08C06B35/00F42B3/12
CPCC01B21/08C06B35/00F42B3/128
Inventor 李明愉曾庆轩吴兴宇
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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