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AssigneesLWB Refractories Company, Krosakiharima Corporation
InventorsKoji Ogata, Donald Bruce Hoover
Estimating the term…
Disclosed is anti-alumina-buildup refractories for casting nozzles, which comprises a refractory aggregate including 20 mass % or more of CaO component, and 10 mass % or more of clinker particles each containing CaO as a mineral phase, on the basis of 100 mass % of the entire composition. At least a part of the surfaces of the CaO exposed from the surfaces of the corresponding clinker particles is formed with a CaCO3 film. The CaCO3 film releases CO2 gas through thermal decomposition to smooth an operative surface of the nozzle so as to prevent the accretion of metal thereon, so that CaO is continuously supplied to alumina attached on the operative surface to prevent alumina buildup. In addition, the CaCO3 film effectively prevents the hydration of CaO due to a hydration reaction.
-2. (canceled)
A casting nozzle, comprising a nozzle structure including an internal hole surface that comes in contact with molten steel during use, said internal hole surface being constructed of a refractory aggregate which includes 20 mass % or more of CaO component, and 10 mass % or more of a clinker including CaO as a mineral phase, and coated with a CaCO3 film having 0.1 to 5 μm thickness formed on at least a portion of the surface of the CaO developed on a particle surface of said clinker including CaO as mineral phase.
Dependencies are inferred from the claim text.