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US 5,418,015 AGranted
Process for forming a refractory oxide coating
AssigneePraxair S.T. Technology, Inc.
InventorsJohn E. Jackson, Hideo Nitta, Katoh Shoichi, Masahiko Amano, Yasushi Kurisu, Keiichiro Ohno
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Abstract
A thermal spray powder feed coating composition composed of stabilized zirconia mixed with zircon and a selected oxide, such as yttria, to form a refractory oxide coating ideally suited for hearth rolls for annealing steel. Process for producing the coating and the coated article so produced is also disclosed.
Claims11
A process for forming a pick-up, wear, thermal shock resistant refractory coating on a substrate comprising the steps:
- (a) forming a powder feed by mixing zircon combined with at least one selected oxide from the group consisting of calcia, yttria, magnesia, hafnia, and a rare earth oxide with particles of zirconia at least partially stabilized with at least one stabilizing oxide selected from the group consisting of calcia, yttria, magnesia, ceria, hafnia and a rare earth oxide to form a substantially homogeneous mixture;
- and
- (b) thermally depositing said powder feed onto the substrate to form a coating composed of ZrO.sub.2 substantially in the cubic and tetragonal phases along with said stabilizing oxide, zircon and the selected oxide combined with the zircon.
Dependencies are inferred from the claim text.