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    METHOD FOR PRODUCING CERAMIC ABRASIVE MATERIALS
    11.
    发明专利
    METHOD FOR PRODUCING CERAMIC ABRASIVE MATERIALS 未知

    公开(公告)号：ZA873917B

    公开(公告)日：1987-12-02

    申请号：ZA873917

    申请日：1987-06-02

    Applicant: LANXIDE TECHNOLOGY COMPANY, LP.

    Inventor： MARC STEVENS NEWKIRK

    IPC: B24D3/06 ,  C04B35/65 ,  C09K3/14 ,  B24D3/14 ,  B24D ,  C04B ,  B28B

    Abstract: In the present invention there is provided a method for producing abrasive ceramic and ceramic composite material characterized by an abrasive grain as the comminuted form of a polycrystalline ceramic material. The abrasive grains of the present invention consist essentially of the oxidation reaction product of a parent metal precursor with a vapor phase oxidant, and, optionally one or more metallic constituents such as non-oxidized constituents of the parent metal. There is also provided a method for producing abrasive grains which additionally consist of one or more inert filler materials.

    RESERVOIR FEED METHOD OF MAKING CERAMIC COMPOSITE STRUCTURES AND STRUCTURES MADE THEREBY
    13.
    发明专利
    RESERVOIR FEED METHOD OF MAKING CERAMIC COMPOSITE STRUCTURES AND STRUCTURES MADE THEREBY 未知

    公开(公告)号：ZA876909B

    公开(公告)日：1988-03-17

    申请号：ZA876909

    申请日：1987-09-15

    Applicant: LANXIDE TECHNOLOGY COMPANY, LP.

    Inventor： MARC STEVENS NEWKIRK ,  HAROLD DANIEL LESHER ,  RATNESH KUMAR DWIVEDI ,  ROBERT CAMPBELL KANTNER

    IPC: B28B7/34 ,  C04B35/10 ,  C04B35/622 ,  C04B35/65 ,  C04B35/653 ,  B22D19/14 ,  C04B35/71 ,  C04B ,  C01F ,  B22D ,  C23C ,  B28D

    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 SHAPED CERAMIC COMPOSITES
    17.
    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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