Carbon-containing refractories with superior erosion and oxidation resistance
AssigneeVesuvius Crucible Company
InventorsMartin Morris, Mark K. Fishler
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Abstract
An elemental carbon-containing refractory composition having superior erosion and oxidation resistance due to the addition of prescribed amounts of boron carbide.
Claims23
A refractory body for controlling the flow of a molten steel stream having a temperature greater than 1400.degree. C. during continuous casting, said refractory body formed of the composition comprising:
- a refractory material selected from the group consisting of alumina, silica, magnesia, zirconia, zircon and silicon carbide;
- elemental crystalline carbon;
- and
- an effective amount of boron carbide to reduce the oxidation rate of said elemental crystalline carbon when said refractory body is subjected to said temperature greater than 1400.degree. C.
A method of improving the oxidation resistance at temperatures greater than 1400.degree. C. of a refractory composition containing elemental crystalline carbon and a refractory material selected from the group consisting of alumina, silica, magnesia, zirconia, zircon and silicon carbide, comprising the steps of:
- adding an effective amount of boron carbide to the refractory composition;
- and
- subjecting said refractory composition to a temperature in excess of 1000.degree. F. after practicing said adding step.
A refractory article formed of a refractory composition, said refractory composition comprising:
- a refractory material selected from the group consisting of alumina, silica, magnesia, zirconia, zircon and silicon carbide;
- elemental crystalline carbon;
- and
- an effective amount of boron carbide to reduce the oxidation rate of said elemental crystalline carbon when said refractory composition is subjected to temperatures greater than 1400.degree. C.
Dependencies are inferred from the claim text.