Protective overlayer for ceramics

Details Protective overlayer for ceramics Protective overlayer for ceramics

2006-02-21

2006-02-21

Vo, Hai (Department: 1771)

Stock material or miscellaneous articles

Composite

Of inorganic material

C428S312200, C428S312800, C428S699000, C428S702000, C428S704000, C501S152000

Reexamination Certificate

active

07001679

ABSTRACT:
A xenotime phosphate protective overlayer (22) for protecting a ceramic material (24) from a high temperature, moisture-containing environment. Yttrium phosphate may be used as a protective overlayer to protect an underlying mullite layer to temperatures in excess of 1,500° C. The coating may have porosity of greater than 15% for improved thermal shock protection. To prevent the ingress of oxygen to an underlying ceramic non-oxide material, such as silicon carbide or silicon nitride, an oxygen barrier layer (34) is disposed between the xenotime phosphate coating and the non-oxide material. Such a protective overlayer may be used for an article having a ceramic matrix composite substrate.

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