US 5,961,661 AGranted

Ceramic structure with backfilled channels

AssigneeThe United States of America as represented by the Secretary of the Navy

InventorTodd Jessen

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Abstract

Ceramic structure having therein reinforcing fibers and backfilled strands s prepared by the arranging tows of fugitive and reinforcing fibers parallel to each other to form a fiber preform, contacting the preform with a matrix precursor whereby the precursor deposits around the fibers, removing the preform from the precursor wherein the fibers are coated with the precursor, drying the preform to solidify the precursor on the fibers and to convert the precursor to a matrix form, calcining the preform to convert the matrix form on the fibers to another matrix form, removing the fugitive fibers from the preform to form channels therein, backfilling the channels with a material, and hot pressing the preform for densification purposes to form the ceramic structure containing spaced fibers and spaced backfilled material strands disposed in the matrix.

Claims6

Dependent claims

A process for preparing a ceramic structure comprising the steps of:

(a) arranging tows of elongated fugitive and reinforcing fibers parallel to each other to form a fiber preform, the fibers being 1-50 microns in diameter,
(b) contacting the fiber preform with a matrix precursor whereby the matrix precursor deposits around the fibers,
(c) removing the fiber preform from the matrix precursor wherein the fibers are coated with the matrix precursor,
(d) drying the fiber preform to solidify the matrix precursor on the fibers and to convert the matrix precursor to a matrix form,
(e) repeating steps (c) and (d) to build-up the matrix precursor/form on the fibers,
(f) calcining the fiber preform to convert the matrix form on the fibers to another matrix form,
(g) removing the fugitive fibers from the fiber preform to form elongated and parallel channels therein,
(h) backfilling the channels with a material, and
(i) hot pressing the fiber preform for densification purposes to form the ceramic structure containing spaced fibers and spaced backfilled material disposed in a ceramic matrix.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/154,090Filed 16 Sep 1998 · division
Priority: 20 Dec 1996
Granted: 5 Oct 1999
Term ends: Not estimatedThe source records don’t support an estimate.

Classification25 codes

C04B 41/5025
With inorganic materials: with ceramic materials
C04B 35/49
Based on zirconium or hafnium oxides, zirconates, zircon or hafnates: containing also titanium oxides or titanates
C04B 35/645
Burning or sintering processes: pressure sintering
C04B 35/80
Containing non-metallic materials: fibres, filaments, whiskers, platelets, or the like