Preparation Of Metal Powder By Mechanical Crushing

Preparation of metal powder by mechanical crushing
Solid metal is broken into powder mainly by crushing, crushing and grinding. There are two types of equipment: coarse crushing and fine crushing. The main crushing equipment includes crusher, roller mill, jaw crusher and other coarse crushing equipment. The main crushing and grinding functions are hammer crusher, rod mill, ball mill, vibration ball mill, mixing ball mill and other fine crushing equipment. The mechanical crushing method is mainly applicable to crushing brittle and easy-to-machine hardened metals and alloys, such as tin, manganese, chromium, high-carbon iron, ferroalloy, etc. It is also used for crushing sponge metal made by reduction and cathode deposit made by electrolysis. It is also used to break brittle titanium after hydrogenation, and then dehydrogenate to obtain fine titanium powder. The mechanical crushing method has low efficiency and high energy consumption. It is mainly used as a supplement to other powder methods or for mixing powders with different properties. In addition, the mechanical crushing method also includes eddy current crusher, which relies on two impellers to generate eddy current to make particles surrounded by air flow collide and smash at high speed, and can be used for crushing plastic and metal. The cold flow crushing method uses high speed and high pressure inert gas flow to carry the coarse powder and spray it on the metal target. Due to the adiabatic expansion of the air flow at the nozzle outlet, the temperature drops sharply below 0 ° C, which makes the coarse metal and alloy powder with low temperature brittleness crushed into fine powder. The mechanical alloying method uses a high-energy ball mill to grind different metals and high-melting compounds into solid solutions or finely dispersed alloy states.