Non-preheated low thermal conductivity substrate for use in spray- deposited strip production

摘要

A molten metal gas-atomizing spray-depositing apparatus has an atomizer which employs a pressurized gas flow for atomizing a stream of molten metal into a spray pattern of semi-solid metal particles. The apparatus also has a movable non-preheated substrate composed of a material having a predetermined thermal conductivity of about one or less (W/M-K) being disposed below the atomizeer. The substrate receives thereon a deposit of the particles in the spray pattern. The pressurized gas flow also impinges thereon for cooling the deposit on the substrate to form a product thereon. The predetermined thermal conductivity of the substrate of one or less precludes extraction of heat by the substrate from, and thus solidification of, the deposit upon initial contact with the substrate whereby a reduction of porosity is achieved in the deposit.