Explosive special for explosive welding, and manufacturing method thereof

Abstract

The invention relates to explosive and a manufacturing method thereof, in particular to explosive special for explosive welding, and a manufacturing method thereof. The explosive comprises the following raw materials in parts by weight: 75 to 85 parts of ammonium nitrate, 10 to 20 parts of diluent, 3 to 5 parts of biological composite oil phase and 3 to 5 parts of dispersing agent, wherein the diluent is formed by combining one or more of dipotassium phosphate, potassium phosphate, calcium superphosphate, potassium chloride and ammonium sulfate. Mixing is conducted and then expansion is conducted, the ammonium nitrate aqueous phase solution, the biological composite oil phase and the diluent are mixed, the diluent is attached to the internal parts and the surfaces of the ammonium nitrate granules after expansion, the prepared explosive has small water content, the detonation velocity is 1800 to 2600 m / s, the explosive violence is 8 to 10 mm, the gap distance of sympathetic detonation is more than or equal to 4 cm, and the compound rate reaches to 100 percent through explosive compound test and ultrasonic flaw detectionafter explosion of different metal stainless steel and carbon steel, copper and copper alloy as well as titanium and titanium alloy.

Description

technical field [0001] The invention relates to an explosive and a manufacturing method thereof, in particular to a special explosive for explosive welding and a manufacturing method thereof. Background technique [0002] Explosion welding is commonly used for welding between dissimilar metals. Explosive welding uses the energy of explosives to weld two or more metal materials together to form a composite material by achieving high-speed oblique collision under the action of detonation waves. Metal composite panels obtained by explosive welding can replace expensive stainless steel and non-ferrous precious metals, and are widely used in many fields such as national defense, aviation, aerospace, petroleum, chemical industry, and machinery manufacturing. [0003] Due to the special requirements of explosive welding technology, the detonation velocity of the explosive used for explosive welding must be controlled within the range of 1300m / s to 2800m / s in order to achieve bette...

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Problems solved by technology

[0004] Currently, the low detonation velocity explosives used in the market can be roughly divided into two types: one is single substance high explosives plus diluent, and the high explosives used are military high explosives such as TNT and RDX. The process is highly dangerous, and at the same time, the explosive produces a large amount of harmful exhaust gas during the explosion process, polluting the environment; one is to add a diluent to the expanded ammonium nitrate explosive or powdery emulsion explosive, such as adding perlite, hollow glass microspheres, salt and other particles to reduce the detonation velocity. The patent application number 200810230535.2 discloses a special explosive for explosive welding of precious metal composite materials and its manufacturing method. Salt and hollow glass microspheres are added to the expanded ammonium nitrate to reduce the detonation velocity.

[0005] However, commonly used diluents such as heavy metal oxides, foam particles, perlite and table salt are difficult to meet the requirements of explosive welding in terms of density, fluidity and detonation performance.

If table salt is used, its great hygroscopicity will cause agglomeration and granulation of explosives. Extensive use will also cause excessive salinization of the soil and damage surrounding vegetation, which does not meet the requirements of sustainable development. Foam particles and perlite and explosives The bulk density is quite different, easy to layer, difficult to mix evenly, difficult to meet the requirements of explosive welding

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