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    CERAMIC COMPOSITE AND METHODS OF MAKING THE SAME
    2.
    发明专利
    CERAMIC COMPOSITE AND METHODS OF MAKING THE SAME 未知

    公开(公告)号：ZA88142B

    公开(公告)日：1988-06-28

    申请号：ZA88142

    申请日：1988-01-11

    Applicant: LANXIDE TECHNOLOGY COMPANY, LP.

    Inventor： JACK ANDREW KUSZYK ,  CHRISTOPHER ROBIN KENNEDY

    IPC: C04B35/622 ,  B22D41/08 ,  B22D41/32 ,  C04B35/10 ,  C04B35/65 ,  C22C29/12 ,  C01B ,  C04B

    Abstract: There is provided a method for producing a self-supporting ceramic composite comprising (1) a ceramic matrix obtained by oxidation of an aluminum zinc alloy to form a polycrystalline oxidation reaction product of the metal (10) with an oxidant, and (2) one or more fillers (12) embedded by the matrix. The metal alloy (10) and permeable mass of filler (12) having at least one defined surface boundary (14) are oriented relative to each other so that formation of the oxidation reaction product will occur into said mass of filler (12) and in a direction towards said defined surface boundary (14). On heating the metal (10) to a first temperature above its melting point but below the melting point of said oxidation reaction product to form a body of molten parent metal, the molten metal reacts with said oxidant to form said oxidation reaction product which infiltrates said mass of filler (12) to said defined surface boundary (14). The resulting infiltrated mass is heated to a second temperature in order to remove or oxidize at least a substantial portion of any residual non-oxidized metallic constituents from or in said infiltrated mass without substantial formation of said oxidation reaction product beyond said defined surface boundary (14), thereby producing a self-supporting ceramic composite.

    METHOD OF MAKING SHAPED CERAMIC COMPOSITES
    5.
    发明专利
    METHOD OF MAKING SHAPED CERAMIC COMPOSITES 未知

    公开(公告)号：ZA879544B

    公开(公告)日：1988-06-16

    申请号：ZA879544

    申请日：1987-12-21

    Applicant: LANXIDE TECHNOLOGY COMPANY, LP.

    Inventor： CHRISTOPHER ROBIN KENNEDY ,  MARC STEVENS NEWKIRK

    IPC: C04B35/10 ,  C04B35/622 ,  C04B35/65 ,  C22C29/12 ,  C04B ,  C01B ,  B01J

    Abstract: The present invention provides a method for producing a self-supporting ceramic composite by the oxidation of a parent metal (10) to form a polycrystalline ceramic material consisting essentially of the oxidation reaction product of the parent metal (10) with an oxidant, including a vapor-phase oxidant, and, optionally, one or more metallic constituents. A permeable filler material, such as a preform (14), with at least one surface bearing a permeble stratum (18), is contacted with a body of molten parent metal (10) heated to a temperature above its melting point but below the melting point of the oxidation reaction product. At least a portion of the oxidation reaction product is maintained in contact with and between the molten metal (10) and oxidant to transport the molten metal through the oxidation reaction product toward the permeable stratum (18) and into contact with the oxidant so that the oxidation reaction product continues to form at the interface between the oxidant and previously formed oxidation reaction product that has infiltrated the filler material. The reaction is continued to infiltrate at least a portion of the stratum (18) with the oxidation reaction product and to produce an intermediate ceramic body having an adjacent ceramic composite overlaid with a ceramic stratum. The ceramic stratum is removed from the underlying ceramic composite to produce a self-supporting ceramic composite having the surface established by the permeable stratum (18).

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