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Low-detonation-velocity mixed explosive for explosive welding and preparation method and application of low-detonation-velocity mixed explosive

A technology of mixed explosives and explosive welding, which is applied in welding equipment, explosives processing equipment, explosives, etc., to achieve the effects of easy production, good safety performance, and wide application

Active Publication Date: 2021-06-01
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still no low-detonation-velocity explosive suitable for explosive welding of ultra-low melting point metal materials, and the detonation velocity is 1300-1500m / s.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Dry 20kg of calcium carbonate powder with a particle size of 45-55 mesh and 10kg of silicon carbide powder with a particle size of 45-55 mesh, and place it in a resonance mixer with 60kg of antimony-free rock ammonium nitrate explosive, and stir for 20-25min until uniform; before welding After 10 minutes, spread the homogeneous mixture obtained above evenly on the explosive composite substrate, and evenly spray 10kg of pure water to make the drug body wet and loose without agglomeration, and obtain a low-detonation-velocity mixed explosive for explosive welding. After testing, when the charge thickness is 2cm, the packing density is 1.10g / cm 3 , successfully detonated, and the explosives exploded fully and evenly. The measured detonation velocity is 1405m / s.

Embodiment 2

[0036] Dry 20kg of calcium carbonate powder with a particle size of 45-55 mesh and 15kg of silicon carbide powder with a particle size of 45-55 mesh, and place it in a resonance mixer with 60kg of antimony-free rock ammonium nitrate explosive, and stir for 20-25min until uniform; before welding For 10 minutes, spread the homogeneous mixture obtained above evenly on the explosive composite substrate, and evenly spray 5kg of pure water to make the drug body moist and loose without agglomeration, and obtain a low-detonation velocity mixed explosive for explosive welding. After testing, when the charge thickness is 2cm, the packing density is 1.14g / cm 3 , successfully detonated, and the explosives exploded fully and evenly. The measured detonation velocity is 1365m / s.

Embodiment 3

[0038] Dry 15kg of calcium carbonate powder with a particle size of 45-55 mesh and 10kg of silicon carbide powder with a particle size of 45-55 mesh, and place it in a resonance mixer with 70kg of antimony-free rock ammonium nitrate explosive, and stir for 20-25min until uniform; before welding For 10 minutes, spread the homogeneous mixture obtained above evenly on the explosive composite substrate, and evenly spray 5kg of pure water to make the drug body moist and loose without agglomeration, and obtain a low-detonation velocity mixed explosive for explosive welding. After testing, when the charge thickness is 2cm, the packing density is 1.09g / cm 3 , successfully detonated, and the explosives exploded fully and evenly. The measured detonation velocity is 1500m / s.

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Abstract

The invention provides a low-detonation-velocity mixed explosive for explosive welding and a preparation method and application thereof, and the low-detonation-velocity mixed explosive is specially used for explosive cladding of low-melting-point metal. The low-detonation-velocity composite explosive comprises the following components (in percentage by mass): 60-70% of antimony-free rock ammonium nitrate explosive (prepared by mixing 70-85% of ammonium nitrate, 3-6% of wood flour, 10-20% of modified urea nitrate and 1.5-4% of a composite modifier), 15-20% of calcium carbonate powder, 5-15% of silicon carbide powder and 5-10% of water. The low-detonation-velocity explosive is prepared by uniformly mixing the components on site. The explosive provided by the invention can significantly reduce the detonation velocity of common antimony-free rock ammonium nitrate explosives and the cost of explosive composite explosives; and the explosive is easy to produce and stable in performance, and overcomes the defects that the detonation velocity is too high and a low-melting-point material is easy to damage when a conventional explosive is used for preparing a low-melting-point metal material explosive composite board. Explosives with different detonation velocity requirements can be prepared on site according to different materials, and the process is simple and suitable for large-scale application.

Description

technical field [0001] The invention relates to an industrial explosive, in particular to a low-detonation-velocity mixed explosive for explosive welding between low-melting-point metal materials and a preparation method thereof. Background technique [0002] Explosive welding technology uses the energy of explosives, under the action of detonation waves, to collide one metal material (composite plate) obliquely with another metal material (substrate) at high speed to realize the metallurgical combination of the two metals. This technology is widely used in national defense, shipbuilding, petrochemical, metallurgy and other fields. As the energy source of explosive welding, the quality of explosives will directly affect the quality of explosive welding. [0003] The detonation velocity of commonly used explosive welding explosives is generally 1500m / s~3000m / s, and for the explosive compounding of ultra-low melting point materials (such as lead and tin), in order to avoid me...

Claims

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Application Information

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IPC IPC(8): C06B31/28C06B21/00B23K20/08
CPCC06B31/28C06B21/00B23K20/08
Inventor 李慧中张文鼎梁霄鹏曾智恒
Owner CENT SOUTH UNIV
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