Comment on "Theoretical Prediction of Erosive Burning Characteristics of Solid Rocket Propellant"

Study on Cutting Process of Manual Thermite Cutting Technology

“…The thermite must contain Fe 2 O 3 +Al for reducing the burning speed. From test we can see that the times of burning arc persisting in specimen will be decreased with CuO+Al, there will appear imperfect combustion of the chemical compositions or blow off the nozzle .There are two reasons for the problem: CuO+Al reaction can easily release oxygen so as to improve combustion speed; the internal structure of grain is hollow and nozzle relatively much smaller than diameter of the cartridge so that the expands gas which was heated difficult to smoothly discharge increase the internal pressure of internal cutting ammunition, and then savings pressure will increase mass flow rate within the grain so as to accelerate the reaction rate [3] . For getting enough jet time and combustion heat, we'd better choose CuO+Al in the thermite with the content of 6.4%-22.8%.…”