Apparatus and process for casting metal matrix composite materia

Details Apparatus and process for casting metal matrix composite materia Apparatus and process for casting metal matrix composite materia

1990-07-13

1994-04-05

Zimmerman, John

Metallurgical apparatus

Means for melting or vaporizing metal or treating liquefied...

By providing, treating or protecting environment, e.g., vacuum

266231, 266235, 164 97, 428614, C22C 110, B22D 1100, B22D 1914

Patent

active

052997243

ABSTRACT:
A composite material mixture of free flowing reinforcement particles in a molten metal is solidified at a cooling rate greater than about 15.degree. C. per second between the liquidus and solidus temperatures of the matrix alloy. This high cooling rate imparts a homogeneous structure to the solid composite material. Care is taken to avoid the introduction of gas bubbles into the molten composite material while the mixture is stirred to prevent segregation of the particles. For viscous melts, an artificial surface layer such as a fiberglass blanket may be used to prevent entrapment of bubbles during pre-casting stirring. Additionally, gas bubbles are removed from the molten mixture by filtering and skimming.

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