公开(公告)号：US20220306811A1

公开(公告)日：2022-09-29

申请号：US17840007

申请日：2022-06-14

Applicant: Raytheon Technologies Corporation

Inventor： Wayde R. Schmidt ,  Paul Sheedy

IPC: C08G77/60 ,  C04B35/56 ,  C04B35/571 ,  C08G77/398

Abstract: Disclosed is a modified preceramic polymer having a polymer backbone consisting of silicon or a combination of silicon and carbon; and a pendant modifier bonded to the backbone wherein the modifier includes silicon, boron, aluminum, a transition metal, a refractory metal, or a combination thereof. The modified preceramic polymer can be used to form a ceramic matrix composite.

公开(公告)号：US20220177379A1

公开(公告)日：2022-06-09

申请号：US17536216

申请日：2021-11-29

Applicant: Raytheon Technologies Corporation

Inventor： Shahram Amini ,  Wayde R. Schmidt ,  Tania Bhatia Kashyap ,  Mark A. Hermann ,  Paul Sheedy ,  Andi M. Limarga ,  Michael G. McCaffrey

IPC: C04B35/80 ,  C04B35/532 ,  C04B35/524 ,  B28B1/24 ,  B28B1/52 ,  C04B38/00

Abstract: A disclosed method of forming a ceramic article includes forming a pre-ceramic polymer article within a mold tool, and performing a first pyrolizing step on the initial pre-ceramic polymer article to form a ceramic article. The method further includes performing at least one pre-heat treatment polymer infiltration and pyrolizing (PIP) cycle on the ceramic article and an initial heat treatment cycle of the ceramic article after the at least one pre-heat treatment PIP cycle. Subsequent PIP cycles and heat treatment cycles are performed in combination to form a ceramic article including a desired density.

公开(公告)号：US20210331393A1

公开(公告)日：2021-10-28

申请号：US16856433

申请日：2020-04-23

Applicant: Raytheon Technologies Corporation

Inventor： Wayde R. Schmidt ,  Paul Sheedy ,  John A. Sharon ,  Neal Magdefrau

IPC: B29C64/291 ,  B29C64/30 ,  B33Y10/00 ,  B33Y30/00 ,  C04B35/64 ,  C04B41/81 ,  C04B41/00

Abstract: A fabrication apparatus for fabricating ceramic structures of controlled size and composition is provided. The fabrication apparatus includes an additive manufacturing machine configured to dispense preceramic materials in a printed pattern, the printed pattern corresponding to the ceramic structures of the controlled size and composition, a radiation emitter configured to emit curing radiation toward the printed pattern to cure the preceramic materials and a lamp element configured to shine light on the preceramic materials to convert the preceramic materials to ceramics.