Recession resistant intermediate layer for CMC vane

A method of manufacturing a ceramic matrix composite (CMC) component, the method comprising:

• providing at least a portion of a ceramic fiber preform comprising a lay-up of ceramic fiber plies;
• embedding an environmental protection layer precursor in at least the portion of the ceramic fiber preform;
• adding an isolation barrier layer to the environmental protection layer precursor;
• completing the ceramic fiber preform if only the portion of the ceramic fiber preform is provided when the environmental protection layer precursor is embedded;
• and
• forming, from the ceramic fiber preform in which the environmental protection layer precursor was embedded, a CMC body of the CMC component, wherein the CMC body comprises a CMC material completely surrounding an environmental protection layer formed from the environmental protection layer precursor,
• wherein the isolation barrier layer is added to the environmental protection layer precursor before forming the CMC body, and
• wherein adding the isolation barrier layer to the environmental protection layer comprises:
• positioning a sheet comprising ceramic particles in a binder or a preceramic polymer onto the environmental protection layer precursor;
• and drying and sintering the sheet together with the ceramic fiber preform.