The gas atomization method is used to prepare the powders,that is,apply the high-speed air flow(Air,Nitrogen,Hydrogen)to molten liquid flow,so that the gas kinetic energy is converted into the surface energy of melt,then formed the fine droplets and solidified into powder particles.Its history originated in the 1920s,with the outbreak of World War II,the demand for iron powder sintered parts increased dramatically,resulting in the emergence of the famous Mannesmann method of gas atomization powder manufacturing process.