公开(公告)号：ZA876944B

公开(公告)日：1988-03-21

申请号：ZA876944

申请日：1987-09-16

Applicant: LANXIDE TECHNOLOGY COMPANY, LP.

Inventor： ROBERT CAMPELL KANTNER ,  MICHAEL KEVORK AGHAJANIAN ,  STANISLAV ANTOLIN ,  ALAN SCOTT NAGELBERG ,  RATNESH KUMAR DWIVEDI

IPC: C04B35/622 ,  C04B35/00 ,  C04B35/10 ,  C04B35/65 ,  C22C29/12 ,  C04B ,  G01N ,  B28B ,  C01F

Abstract: A ceramic body is formed of alumina obtd. by oxidn. of molten aluminium with an oxygen-contg. gas under such conditions that the product remains in contact with the metal to form a body through which metal is continuously drawn to the oxidant interface to cause growth of the body. The body may also include non-oxidised metal components. - The body is caused to have a refined microstructure by including a process modifier either in the molten metal or in contact with it. - In a modification a body of filler is located adjacent to the metal bath so that it becomes embedded in the oxidn. product. Pref. the modifier is Cu, Ni, Fe, Zr, Cr, Ti, W, Nb or Co. - The modifier is pref. used in an amt. of 0.1-10 wt.% based on the aluminium metal. It may be alloyed with the latter, applied as a powder to the growth surface of the initial aluminium body, or mixed with the filler, which may be silicon carbide. (Dwg.0/3)

公开(公告)号：ZA8704916B

公开(公告)日：1988-01-19

申请号：ZA8704916

申请日：1987-07-07

Applicant: LANXIDE TECHNOLOGY COMPANY, LP.

Inventor： RATNESH KUMAR DWIVEDI

IPC: B32B18/00 ,  C04B35/10 ,  C04B35/622 ,  C04B35/65 ,  C04B41/50 ,  C04B41/87 ,  C04B ,  B28B ,  C22C

CPC classification number: C04B41/009 ,  C04B35/652 ,  C04B41/5025 ,  C04B41/87 ,  Y10T428/12007 ,  Y10T428/12153 ,  Y10T428/2993 ,  C04B41/4505 ,  C04B41/4578 ,  C04B35/00 ,  C04B35/65 ,  C04B38/00

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.

公开(公告)号：ZA876897B

公开(公告)日：1988-03-17

申请号：ZA876897

申请日：1987-09-15

Applicant: LANXIDE TECHNOLOGY COMPANY, LP.

Inventor： MARC STEVENS NEWKIRK ,  DANNY RAY WHITE ,  RATNESH KUMAR DWIVEDI

IPC: B28B20060101 ,  B28B13/00 ,  C01B20060101 ,  C04B20060101 ,  C04B14/48 ,  C04B35/00 ,  C04B35/10 ,  C04B35/71 ,  C04B35/74 ,  C04B ,  B28B ,  C01B

公开(公告)号：ZA876947B

公开(公告)日：1988-03-21

申请号：ZA876947

申请日：1987-09-16

Applicant: LANXIDE TECHNOLOGY COMPANY LP.

Inventor： RATNESH KUMAR DWIVEDI ,  CHRISTOPHER ROBIN KENNEDY

IPC: C04B41/80 ,  C04B35/00 ,  C04B35/622 ,  C04B35/65 ,  C04B41/50 ,  C04B41/87 ,  C04B ,  C01B ,  B28B

Abstract: A method of producing self-supporting ceramic structures (12) comprising (i) a polycrystalline oxidation reaction product formed upon oxidation of a molten parent metal (14) with an oxidant, and (ii) interconnected porosity (13) at least partially accessible from one or more surfaces (15) of said ceramic body. A second polycrystalline ceramic material is incorporated into the porosity of said ceramic body to modify or contribute to its properties.

公开(公告)号：ZA8706947B

公开(公告)日：1988-03-21

申请号：ZA8706947

申请日：1987-09-16

Applicant: LANXIDE TECHNOLOGY COMPANY LP.

Inventor： RATNESH KUMAR DWIVEDI ,  CHRISTOPHER ROBIN KENNEDY

IPC: C04B41/80 ,  C04B35/00 ,  C04B35/622 ,  C04B35/65 ,  C04B41/50 ,  C04B41/87 ,  C04B ,  B28B ,  C01B

CPC classification number: C04B41/009 ,  C04B35/652 ,  C04B41/5025 ,  C04B41/87 ,  C04B41/4505 ,  C04B35/00 ,  C04B35/65 ,  C04B38/00

公开(公告)号：ZA8706944B

公开(公告)日：1988-03-21

申请号：ZA8706944

申请日：1987-09-16

Applicant: LANXIDE TECHNOLOGY COMPANY, LP.

Inventor： ROBERT CAMPELL KANTNER ,  MICHAEL KEVORK AGHAJANIAN ,  STANISLAV ANTOLIN ,  ALAN SCOTT NAGELBERG ,  RATNESH KUMAR DWIVEDI

IPC: C04B35/622 ,  C04B35/00 ,  C04B35/10 ,  C04B35/65 ,  C22C29/12 ,  C04B ,  B28B ,  C01F ,  G01N

CPC classification number: C04B35/652 ,  C22C29/12

公开(公告)号：ZA8706909B

公开(公告)日：1988-03-17

申请号：ZA8706909

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

CPC classification number: B28B7/344 ,  B28B7/342 ,  C04B35/652

公开(公告)号：ZA8706897B

公开(公告)日：1988-03-17

申请号：ZA8706897

申请日：1987-09-15

Applicant: LANXIDE TECHNOLOGY COMPANY, LP.

Inventor： MARC STEVENS NEWKIRK ,  DANNY RAY WHITE ,  RATNESH KUMAR DWIVEDI

IPC: B28B20060101 ,  B28B13/00 ,  C01B20060101 ,  C04B20060101 ,  C04B14/48 ,  C04B35/00 ,  C04B35/10 ,  C04B35/71 ,  C04B35/74 ,  C04B ,  B28B ,  C01B

公开(公告)号：ZA874916B

公开(公告)日：1988-01-19

申请号：ZA874916

申请日：1987-07-07

Applicant: LANXIDE TECHNOLOGY COMPANY, LP.

Inventor： RATNESH KUMAR DWIVEDI

IPC: B32B18/00 ,  C04B35/10 ,  C04B35/58 ,  C04B35/622 ,  C04B35/65 ,  C04B41/50 ,  C04B41/87 ,  C04B ,  B28B ,  C22C

Abstract: There is disclosed a method for making a self-supporting ceramic composite article having a porous core bearing a dense surface layer formed integrally with said core. A preform comprises a filler material and parent metal distributed therethrough, wherein the volume percent of parent metal is sufficient to form a volume of oxidation reaction product exceeding the total volume available within said preform. The parent metal is molted and reacted with an oxidant to form an oxidation reaction product filling the spatial volume and leaving voids. The reaction is continued to further transport molten parent metal through the oxidation reaction product to at least one surface of the preform to form oxidation reaction product on said surface substantially free of voids thereby forming a relatively dense surface layer.