PREPARATION OF PARTICLE BY GAS ATOMIZATION SYNTHESIS OF HEAT-RESISTANT COMPOUND OR INTERMETALLIC COMPOUND AND SUPERSATURATED SOLID SOLUTION

摘要

PURPOSE: To easily produce particles in which disired dispersoids are formed on the original positions in metal matrix by atomizing a melt including metal with the mixture of a carrier gas and a second gas in a specific proportion and solidifying the same under a specific condition. ;CONSTITUTION: The melt including metal or alloy is supplied from an induction melting furnace 18 in a melting chamber 10 into an atomizing nozzle 22 and is made to be atomized particles. At this time, the atomizing gas mixture which is prepared by mixing the carrier gases respectively from pressurizing bottles 40, 44 and the second gas or a liquid in a conduit 25 is supplied to a nozzle 22. The ratio of the carrier gases to the second gas or the liquid is selected so that the supersaturated atomic species of the second gas or the liquid is obtd. up to a depth beneath the surface of atomized particles in the state of a solid solution in the atomized particles. Subsequently, the atomized particles are rapidly solidified in an atomization zone (ZZ) for pulverizing and the supersaturated atomic species are retained in the atomized particles. The atomizing gas mixture includes an inert gas and a gas, for instance, nitrogen which reacts with metal, for instance, Al to form a dispersoid at the time of dissolving the gas into the metal.;COPYRIGHT: (C)1995,JPO