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Method for coating nitroamine explosives by adopting atomic layer deposition technique

A technology of atomic layer deposition and nitramine, applied in the field of explosives, can solve the problems of inability to achieve precise control of coating film thickness, weak surface force of coating film, easy peeling and falling off, etc., and achieve easy implementation, promotion and automation High performance and good safety performance

Inactive Publication Date: 2015-04-08
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the gas phase method achieves physical coating on the surface of HMX, and the coating film has a weak force on the surface of HMX, and it is easy to peel off and fall off when subjected to external force.
In addition, this gas phase coating method cannot achieve precise control of the thickness of the coating film

Method used

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  • Method for coating nitroamine explosives by adopting atomic layer deposition technique
  • Method for coating nitroamine explosives by adopting atomic layer deposition technique
  • Method for coating nitroamine explosives by adopting atomic layer deposition technique

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The present embodiment provides a kind of method that adopts atomic layer deposition technology to coat Otok gold (HMX) particle, and this method specifically comprises the following steps:

[0038] Step 1, place the HMX particle sample (average particle size 10 μm) in the reaction chamber of the vapor phase atomic layer deposition system, seal the reaction chamber, feed nitrogen into the vapor phase atomic layer deposition system and vacuumize, adjust the nitrogen flow rate to 80 sccm, and adjust the reaction The cavity outlet valve controls the pressure in the cavity at 133Pa; and the sample temperature is kept at 100°C by heating;

[0039] Step 2: Perform atomic layer deposition on the HMX particle sample to form a coating film. A cycle of atomic layer deposition growth includes the following four links:

[0040](1) Inject the first reaction precursor trimethylaluminum (TMA) into the reaction chamber to make it undergo a saturated surface chemical reaction with HMX a...

Embodiment 2

[0052] This example provides a method for coating Otokon gold (HMX) particles by atomic layer deposition technology. This method is the same as that of Embodiment 1, except that in Step 3 of this embodiment, Step 2 needs to be repeatedly executed for 300 cycles. The average film growth rate of the coating film is 0.12nm / cycle, the thickness of the coating film is 36nm, and occupies 4.6% of the mass of HMX. The complete and uniform coating of the HMX particles is realized through the coating film. The electrostatic spark sensitivity test results show that, compared with uncoated HMX particles, the HMX 50% ignition energy after 300 cycles of ALD alumina coating treatment increases from 29.9mJ to 73.5mJ, and the electrostatic spark sensitivity is significantly reduced.

[0053] It can be seen from the above examples 1 and 2 that the thickness of the coating film on the HMX particles has a linear relationship with the number of cycles of atomic layer deposition growth. Under the...

Embodiment 3

[0058] This embodiment provides a kind of method that adopts atomic layer deposition technology to coat Ottogram gold (HMX) particle, and this method is the same as embodiment 1, and difference only is that in the step 1 of this embodiment, the average particle diameter is 10 μm The HMX particles were replaced by HMX particles with an average particle size of 200 μm. After 150 cycles of atomic layer deposition, a coating film with a thickness of about 18nm was formed on the surface of the HMX particles (the average growth rate of the coating film was 0.12nm / cycle), and the content of the coating film was 0.11% of the total weight of the coated HMX particles. %. The electrostatic spark sensitivity test results show that, compared with uncoated HMX particles, the 50% ignition energy of HMX particles coated with ALD alumina after 150 cycles increases from 29.9mJ to 60.7mJ, and the electrostatic spark sensitivity decreases significantly. Comparative examples 1, 2, and 3 found tha...

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Abstract

The invention belongs to the field of energetic materials, and discloses a method for coating nitroamine explosives by adopting an atomic layer deposition technique. In the method, two reaction precursors alternatively pass through a reaction cavity, and chemical reaction occurs on the surfaces of nitroamine explosive particles to form coating films. The coating film completely and uniformly covers the whole outer surface of each nitroamine explosive particle, and the thickness of the coating film can be precisely adjusted within a nanoscale range. The method is suitable for coating nitroamine explosive particles in micron order, nanometer order or millimeter order. When the thickness of the coating film is controlled to be within the nanoscale range, the content of the coating films only accounts for 0.1 percent to 5 percent of the total mass of the system, and therefore, the coating films have little influence on the nitroamine explosives. The electrostatic spark sensitivity of the nitroamine explosives coated through the method disclosed in the invention is significantly reduced. The method has the advantages of high degree of automation and good safety performance. The coated nitroamine explosive particles can be directly used without postprocessing, so that the method is easy to realize and generalize in industry.

Description

technical field [0001] The invention relates to a method for treating nitroamine explosive particles, and belongs to the field of explosives. Background technique [0002] Nitramine explosives are elemental military explosives with excellent performance, and can be widely used as high-energy additives in various modified solid propellants. However, nitramine explosives such as octokin (HMX) are more sensitive to external impact, friction and electrostatic reactions, resulting in risks in the development, storage, transportation and use of new explosives and propellants, thus limiting them to a certain extent. Its further application in the fields of solid propellants and high-energy explosives. The current method to reduce the sensitivity is mainly to use inert substances to coat the explosive particles to change the surface properties of the explosive. [0003] According to the different physical environment of the reactants in the coating process, it can be divided into ...

Claims

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Application Information

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IPC IPC(8): C06B25/34
Inventor 冯昊秦利军龚婷郝海霞惠龙飞
Owner XIAN MODERN CHEM RES INST
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