31.
    发明专利
    未知

    公开(公告)号:ES2033915T3

    公开(公告)日:1993-04-01

    申请号:ES87630176

    申请日:1987-09-03

    Abstract: A method for producing a self-supporting ceramic composite structure comprising a ceramic matrix embedding a filler (38) includes oxidizing a parent metal to form a polycrystalline material comprising the oxidation reaction product of the parent metal with an oxidant and, optionally, one or more metallic constituents, and the filler (38) embedded by the matrix. The method includes heating the parent metal to provide a first source (36) of molten parent metal and a reservoir (34) of molten parent metal and contacting the first source (36) of molten parent metal with a permeable bedding of filler (38). The first source (36) of molten parent metal is reacted with the oxidant to form the oxidation reaction product and is replenished from the reservoir (34) as the reacting continues for a time sufficient to grow the oxidation reaction product to a desired boundary and thereby embed at least a portion of the bedding of filler (38) within the oxidation reaction product to form the ceramic composite structure. The bedding of filler (38) may have any suitable shape, including that of a hollow body, the interior of which is contacted by the first source (36) of molten parent metal to grow the oxidation reaction product through the shaped, hollow body of filler.

    METHOD OF MAKING CERAMIC ARTICLES HAVING CHANNELS THEREIN AND ARTICLES MADE THEREBY

    公开(公告)号:ZA876905B

    公开(公告)日:1988-03-17

    申请号:ZA876905

    申请日:1987-09-15

    Abstract: A method is provided for producing a self-supporting ceramic body comprising a polycrystalline material comprised of the oxidation reaction product of a parent metal (10) and having therein one or more channels which inversely replicate the geometry of a configured fugitive metal (6). The method includes providing an assembly of the configured fugitive metal (6) and the parent metal (10), optionally including a bed of permeable filler (4), and heating the assembly to form a body of molten parent metal. The molten parent metal is oxidized under selected conditions to grow the polycrystalline material to engulf the configured fugitive metal (6) (and to infiltrate the filler (4), if the filler (4) is present) and to cause the fugitive metal (6) to disperse into the engulfing polycrystalline material thereby leaving behind as the one or more channels the space formerly occupied by the configured fugitive metal (6). The method provides self-supporting ceramic bodies having therein one or more channels inversely replicating the shape of the configured fugitive metal (6).

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