Explanation

Under the action of appropriate external excitation energy, the compound or mixture can undergo explosion change (chemical reaction with extremely fast speed and releasing a lot of heat and gas) and work on the surrounding medium. It can be solid, liquid or gaseous, gas liquid or gas solid, mostly solid. Broadly divided into four categories: primary explosive, explosive, propellant and pyrotechnic composition. primary explosive is used to initiate and produce detonation, which is also called high detonation velocity; propellant and pyrotechnic composition are used to produce combustion and deflagration, so they are also called low detonation velocity. Usually referred to as' fierce '. According to chemical composition, it can be divided into elemental and mixed substances. It is not only the energy source of weapons, but also the energetic materials that many sectors of the national economy are always short of. It can produce extremely rapid explosion changes, and can instantly generate gas with pressure of tens of gigapapas (GPa) and temperature of thousands of degrees Celsius. This gas expands rapidly around the explosion point to do work. The explosion characteristics of can be comprehensively evaluated by five parameters: explosion heat, detonation velocity, detonation temperature, detonation pressure and detonation volume (specific volume), which are the decisive factors for the work ability (power) and the ability to crush surrounding media (ferocity). The characteristic parameters include sensitivity, stability, compatibility, etc. In military terms, it is used as a lethal explosive charge to fill various shells, aviation bombs, missile warheads, torpedoes, mines, hand grenades, explosive charges, as well as the initiating components of atomic bombs and thermonuclear weapons. In civil use, it is widely used in various engineering blasting operations (such as mining, construction, water conservancy) and metal explosion processing (weld, molding, composition), as well as in manufacturing superhard materials (such as diamond, boron nitride), artificial rainfall, fire extinguishing, seismic exploration, oil well perforation, etc.

Classification