A preparation method of an ultramicro carbon-iron
alloy material comprises the following steps:
grinding a high-carbon iron
alloy block, spraying the high-carbon iron
alloy block into a suspension roaster in an
oxygen-enriched environment, carrying out
spontaneous heating partial oxidation, cooling the partially oxidized
powder, detecting the contents of carbon and
oxygen elements, uniformly mixing the partially oxidized
powder with unoxidized high-carbon iron alloy
powder according to a certain ratio, and carrying out heat treatment to obtain the ultramicro carbon-iron alloy material. And after the reaction is finished, the materials in the furnace are cooled, and the materials are discharged out of the furnace to obtain the ultra-micro carbon-iron-based
metal material. According to the method, the characteristic that
elemental carbon and iron in the high-carbon iron alloy material can be combusted under certain conditions is utilized, the
decarburization and
oxygenation conditions are accurately controlled, materials in a suspension state are not sintered,
decarburization is uniform, secondary
grinding is not needed, a heat source does not need to be additionally introduced, the production cost is effectively reduced, the product quality is improved, and the ultramicro carbon iron alloy material can be produced after
vacuum sintering.