Method for forming a metal matrix composite body by an outside-in spontaneous infiltration process, and products produced thereby
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United States of America Patent
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Dec 7, 1993
Issued Date -
N/A
app pub date -
Nov 25, 1991
filing date -
Nov 10, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a novel method for forming a metal matrix composite body. Particularly, a permeable mass of filler material is formed into a preform, the preform having at least a portion thereof which contains a cavity. An infiltration enhancer and/or an infiltration enhancer precursor and/or an infiltrating atmosphere are also in communication with the preform, at least at some point during the process, which permits molten matrix metal to spontaneously infiltrate the preform when the preform is placed into molten matrix metal. An infiltrating atmosphere is provided in communication with the cavity in the preform for at least a portion of the process, and molten matrix metal is contacted with an exterior portion of the preform, such that molten matrix metal will spontaneously infiltrate the preform from an exterior surface thereof toward the cavity. The process can be performed in a continual manner.
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