Plasma spray coated ceramic bodies and method of making same
US4877705A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 1988 |
| Grant date | Oct 31, 1989 |
| Priority date | — |
| Expiry date | Mar 3, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/30
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.