Lightweight metal with isolated pores and its production

Details Lightweight metal with isolated pores and its production Lightweight metal with isolated pores and its production

1992-06-29

1993-06-22

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

428593, B22D 2700

Patent

active

052213242

ABSTRACT:
A novel lightweight gas metal composite is produced having isolated particle stabilized pores. A composite of a metal matrix, e.g. aluminum, and finely divided solid stabilizer particles, e.g. silicon carbide, is heated above the liquidus temperature of the metal matrix and this is mixed such that a vortex is formed. The molten composite is blanketed with a gas and during the vortex mixing. This gas is drawn into the melt to produce an expanded, viscous molten composite material containing pores which are very small, spherical-shaped and quite evenly distributed. The viscous molten composite material can be directly formed into a solid shaped product and is also capable of being remelted and formed by forming processes without destroying the integrity of the pores. The result is a lightweight expanded metal product capable of being formed into shapes to close dimensional tolerances.

REFERENCES:
patent: 3297431 (1967-01-01), Ridgway
patent: 4713277 (1987-12-01), Akiyama et al.
patent: 4713277 (1987-12-01), Akiyama et al.
patent: 4973358 (1990-11-01), Jin et al.

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