Thermal conductivity of substrate material correlated with atomi

Details Thermal conductivity of substrate material correlated with atomi Thermal conductivity of substrate material correlated with atomi

1988-11-14

1990-08-07

Seidel, Richard K.

Metal founding

Means to shape metallic material

Continuous or semicontinuous casting

164 46, 164138, 164271, B22D 2300

Patent

active

049459732

ABSTRACT:
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 and producing a flow of the particles along with the gas flow in a generally downward direction. The apparatus also has a substrate disposed below the atomizer for impingement on the substrate of the gas flow at a steady state temperature resulting from heat transfer by the metal particles to the gas flow and for receiving a deposit of the particles in the spray pattern to form a product thereon. The substrate is composed of a material having a thermal conductivity primarily correlated with the steady state temperature of the gas flow so as to limit heat transfer from the deposit to the substrate and provide a sufficient fraction of liquid in the initial deposit to feed the interstices between the particles and provide an interface for subsequent deposits, resulting in a reduction of porosity and improvements of flatness of the deposit.

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