Plasma spray coated ceramic bodies and method of making same

Details Plasma spray coated ceramic bodies and method of making same Plasma spray coated ceramic bodies and method of making same

1988-03-03

1989-10-31

Robinson, Ellis P.

Stock material or miscellaneous articles

Hollow or container type article

Glass, ceramic, or sintered, fused, fired, or calcined metal...

222591, 428212, 4283126, 4283128, 428408, 428699, 428701, 428336, B05D 108, B32B 900

Patent

active

048777056

ABSTRACT:
The corrosion and erosion resistance of ceramic bodies, such as submerged pouring shrouds and nozzles, exposed to molten steel and slag during continuous casting, is improved by applying a layer of a ceramic material to the exposed surfaces by plasma spraying. The apparent porosity of the coating is at least 15% lower than that of the ceramic body. Corrosion and erosion resistant material suitable for such plasma sprayed coatings on alumina-graphite and zirconia-graphite bodies include one or more as mixtures or compounds of the following: zirconia; chromium oxide; alumina; silica; magnesia; zirconium silicate; and titanium oxide. A corrosion and erosion resistant coating system for fused silica, which is also resistant to thermal cracking, includes an outer coating of a plasma sprayed ceramic material, such as zirconia, and one or more intermediate layers of plasma sprayed material containing varying amounts of zirconium silicate.

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