Specialized metallurgical processes – compositions for use therei – Processes – Producing solid particulate free metal directly from liquid...
Patent
1992-08-11
1993-11-30
Wyszomierski, George
Specialized metallurgical processes, compositions for use therei
Processes
Producing solid particulate free metal directly from liquid...
75338, 264 11, B22F 704
Patent
active
052660990
ABSTRACT:
Metal and metal alloy preforms having closed cell, spherical porosity are spray formed at high deposition rates by introducing blowing agents into the thixotropic semisolid deposition layer, within which gas formed in thermal decomposition reactions are trapped. Density reductions of nearly 30% were generated in a phosphor bronze matrix, using barium carbonate as the blowing agent. Hollow glass particles were produced in the same matrix alloy by injection of microsphere precursor frit containing sulfur. A simple Newtonian heat transfer model of agent heating in the spray predicts agent/matrix compatibility. Along with modest improvements in damping capacity, tensile and compressive properties were found to be equal or superior to powder metallurgy product at the same porosity levels.
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Miller Charles D.
The United States of America as represented by the Secretary of
Wyszomierski George
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