EXTRUSION DIES WITH ZONED COATINGS, METHODS OF FABRICATING SUCH DIES, AND METHODS OF MANUFACTURING CERAMIC ARTICLES

    公开(公告)号:US20230398716A1

    公开(公告)日:2023-12-14

    申请号:US18032085

    申请日:2021-11-22

    CPC classification number: B28B3/269 B28B2003/203

    Abstract: An extrusion die (16) including a plurality of pins (38) having side surfaces defining an intersecting array of slots (30) extending axially into the die (16) from a discharge face (34) of the die (16). A plurality of feedholes (28) extend axially from an inlet face (32) of the die (16) opposite to the discharge face (34). The feedholes (28) connect with the slots (30) at intersections (35) within the die (16) to create a flow path from the inlet face (32) to the discharge face (34). A first coating (42) is on at least a portion of the feedholes (28) in a first zone (46) extending over a first axial length of the flow path. A second coating (44) that is different than the first coating (42) is on at least a portion of the side surfaces (37) of the pins (38) in a second zone (48) extending over a second axial length of the flow path. Methods of fabricating an extrusion die (16) and manufacturing a ceramic article (100), such as a honeycomb body, are also disclosed.

    System and method for vapor deposition coating of extrusion dies using impedance disks

    公开(公告)号:US11697873B2

    公开(公告)日:2023-07-11

    申请号:US17414569

    申请日:2019-12-13

    Abstract: Methods of depositing an inorganic material on an extrusion die including positioning an extrusion die within a vapor deposition chamber, positioning an impedance disk over a face of the extrusion die, the impedance disk having a plurality of through holes and the face of the extrusion die having a plurality of slots defined by a plurality of extrusion die pins, and flowing one or more deposition gases through the plurality of through holes and into the plurality of slots to deposit inorganic particles on side walls of the plurality of pins. The total impedance to the flow of the deposition gases across the impedance disk and the extrusion die may be equal to a disk impedance of the impedance disk plus a die impedance of the extrusion die, and the disk impedance may be at least 40% of the total impedance to the flow of the deposition gases.

    Ceramic honeycomb bodies, honeycomb extrusion dies, and methods of making ceramic honeycomb bodies

    公开(公告)号:US11117083B2

    公开(公告)日:2021-09-14

    申请号:US15755910

    申请日:2016-08-24

    Abstract: A method to form a laminar integral skin of a honeycomb structure is provided. The method includes extruding a ceramic precursor batch through a die with feedholes in entry side and slots in exit face of the die to form the honeycomb structure. In a region on the periphery of the die configured to form the cell matrix, a series of concentric slots around the matrix in the exit face of the die are configured to feed skin onto the matrix. Ring sections between concentric slots are angled away from the center and a mask is disposed on top of the periphery producing a channel for extruded skin to meet and bond to extruded matrix. Optionally, slots in the skin-forming ring sections enhance knitting between laminar skin layers. The die and honeycomb body having uniform integral skin are also provided.

    EXTRUSION COMPONENTS FOR HONEYCOMB BODIES
    20.
    发明申请

    公开(公告)号:US20190030753A1

    公开(公告)日:2019-01-31

    申请号:US16077122

    申请日:2017-02-13

    Abstract: A honeycomb extrusion die assembly (10) comprising a honeycomb extrusion die (701) and a forming plate (800) to block batch flow to at least a portion of a skin forming region. The honeycomb extrusion die (701) comprising a step cut discharge surface (758, 760) in the skin forming region and at least some slots (722) each with a divot (312) spaced toward a discharge surface (710) from a feedhole-slot intersection and a wide portion at the discharge surface (710) extending into the die body to the divot (312) to strengthen a peripheral region of a honeycomb extrudate in a reinforcement region, and a bulk nominal section corresponding to a bulk region of the honeycomb body.

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