Patent ID: 11919820
Assignee: RTX CORPORATION
Field: nan (nan)
Classification: CPC nan | IPC C  D

Claim 6:
7. A composite material comprising:
a ceramic matrix material and a plurality of ceramic fibers embedded within the ceramic matrix material;
wherein the plurality of ceramic fibers comprise a multi-layer interface coating and the multi-layer interface coating comprises a first silicon carbide coating layer adjacent to the plurality of ceramic fibers, a portion of the first silicon carbide layer is oxidized to form amorphous silicon dioxide, and
a silicon dioxide coating layer deposited onto the first silicon carbide coating layer, the silicon dioxide coating layer including the amorphous silicon dioxide,
an additional interface coating layer adjacent to the silicon dioxide coating layer and opposedly disposed on a surface of the silicon dioxide from the surface that contacts the first silicon carbide coating;
wherein the additional interface coating layer includes silicon carbide,
wherein the silicon dioxide coating layer forms micro cracks after a crystal structure transformation, and
wherein the silicon dioxide coating layer includes silicon dioxide in β cristobalite form which forms micro cracks after transforming to α cristobalite form.