Gating means for metal matrix composite manufacture
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United States of America Patent
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Sep 10, 1996
Issued Date -
N/A
app pub date -
May 31, 1994
filing date -
Nov 10, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to the use of a gating means in combination with a spontaneous infiltration process to produce a metal matrix composite body. Particularly, a permeable mass of filler material or a preform is spontaneously infiltrated by molten matrix metal to form a metal matrix composite body. A gating means is provided which controls or limits the areal contact between molten matrix metal and the filler material or preform. The use of a gating means provides for control of the amount of matrix metal which can contact the preform or filler material, which may result in less machining of a formed metal matrix composite body compared with a similar metal matrix composite body made without a gating mean. Moreover, the use of a gating means ameliorates the tendency of a formed metal matrix composite body to warp due to the contact between the formed composite body and matrix metal carcass. In a preferred embodiment, the gating means may comprise a porous material or a precursor to a porous material, which may optionally function as a separation facilitator. Alternatively, the separation facilitator may be provided independent of the gating means.
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