Gating means for metal matrix composite manufacture

Details Gating means for metal matrix composite manufacture Gating means for metal matrix composite manufacture

1994-05-31

1996-09-10

Lavinder, Jack W.

Metal founding

Process

Shaping liquid metal against a forming surface

164 98, B22D 1914, B22D 1902

Patent

active

055536573

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.

REFERENCES:
patent: 3547180 (1970-12-01), Cochran
patent: 3981352 (1976-09-01), Nurminen
patent: 4476916 (1984-10-01), Nusbaum
patent: 4923832 (1990-05-01), Newkirk
patent: 5007474 (1991-04-01), Langensiepen et al.
patent: 5119864 (1992-06-01), Langensiepen et al.
patent: 5249621 (1993-10-01), Aghajanian et al.
patent: 5298339 (1994-03-01), Aghajanian et al.

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