EP0503316A2
Expired / Lapsed
EP
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Erosion, thermal shock and oxidation resistant refractory compositions
Assignee: Vesuvius Crucible Co
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Filing: 1992-02-18
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Granted: —
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Expires: 2012-02-18
Abstract
Abstract A refractory material possessing excellent erosion, thermal shock and oxidation resistance, as well as resistance to oxide build up useful in continuous casting of steel for use in such articles as tundish shrouds, particularly for slagline sleeves, bore liners and upper seating areas in such shrouds, as well as for stopper rod noses. The material consists of the following by weight: (a) carbon, from about 4% to about 50%; (b) one or more members selected from the group consisting of zirconium di-boride and titanium di-boride in an amount of from about 10% to about 90%; and (c) one or more members selected from the group consisting of zirconia, SiAlON, clay, alumina, magnesia, silica, silicon carbide, silicon nitride, boron nitride, mullite and chromia in an amount of from about 10% to about 80%.
Inventors
- 👤 Dale B. Hoggard
- 👤 Quentin K. Robinson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 13:04
CPC Classifications
B; B22; B22D; B22D41/00; B22D41/50; B22D41/52; B22D41/54; C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; B22D11/00; B22D11/10; B22D41/14; B22D41/16; B22D41/18; C04B35/01; C04B35/10; C04B35/111; C04B35/117; C04B35/48; C04B35/486; C04B35/488; C04B35/52; C04B35/522; C04B35/5805; C04B35/58064; C04B35/58071; C04B35/58078; C04B35/583; C04B35/66; C04B2111/00; C04B2111/00474; C04B2111/0087; C04B2111/00887; C04B2235/00; C04B2235/70; C04B2235/96; C04B2235/9669; C04B2235/9676
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
78 words
A refractory composition consisting of, by weight: (a) carbon, from about 4% to about 50%; (b) one or more members selected from the group consisting of zirconium di-boride and titanium di-boride in an amount of from about 10% to about 90%; and (c) one or more members selected from the group consisting of zirconia, SiAlON, clay, alumina, magnesia, silica, silicon carbide, silicon nitride, boron nitride, mullite and chromia in an amount of from about 10% to about 80%.
Claim 2
Dependent Claim
18 words
The refractory composition of claim 1 wherein the carbon constituent is supplied from a carbonaceous binder and graphite.
Claim 3
Dependent Claim
16 words
The refractory composition of claim 1 further including from about 1% to about 8% boron carbide.
Claim 4
Dependent Claim
75 words
The refractory composition of claim 1 consisting of, by weight: (a) carbon supplied predominately from a graphite source in an amount of from about 4% to about 50%; (b) one member selected from the group consisting of zirconium di-boride and titanium di-boride in an amount of from about 20% to about 80%; and (c) one member selected from the group consisting of zirconia and SiAlON in an amount of from about 10% to about 55%.
Claim 5
Dependent Claim
74 words
The refractory composition of claim 1 consisting of, by weight: (a) carbon supplied predominately from a graphite source in an amount of from about 20% to about 30%; (b) one member selected from the group consisting of zirconium di-boride and titanium di-boride in an amount of from about 30% to 70%; and (c) one member selected from the group consisting of zirconia and SiAlON in an amount of from about 10% to about 55%.
Claim 6
Dependent Claim
47 words
The refractory composition of claim 1 consisting of, by weight: (a) carbon from about 15% to about 25%; (b) zirconium di-boride from about 55% to about 65%; (c) SiAlON from about 10% to about 20%; and further including (d) boron carbide from about 1% to about 5%.
Claim 7
Dependent Claim
47 words
The refractory composition of claim 1 consisting of, by weight: (a) carbon from about 15% to about 25%; (b) zirconium di-boride from about 30% to about 40%; (c) zirconia from about 30% to about 40%; and further including (d) boron carbide from about 1% to about 5%.
Claim 8
Dependent Claim
107 words
An article for use in casting molten metal wherein the article includes a molten metal contacting surface of a carbon-bonded refractory composition for resisting erosion, thermal shock, oxidation and oxide build up consisting of, by weight: (a) carbon, from about 4% to about 50%; (b) one or more members selected from the group consisting of zirconium di-boride and titanium di-boride in an amount of from about 10% to about 90%; and (c) one or more members selected from the group consisting of zirconia, SiAlON, clay, alumina, magnesia, silica, silicon carbide, silicon nitride, boron nitride, mullite and chromia in an amount of from about 10% to about 80%.
Claim 9
Dependent Claim
11 words
The article of claim 8 comprising a submerged entry tundish shroud.
Claim 10
Dependent Claim
19 words
The tundish shroud of claim 9 having at least a liner portion made from said carbon bonded refractory composition.
Claim 11
Dependent Claim
20 words
The tundish shroud of claim 9 having at least a slagline sleeve portion made from said carbon bonded refractory composition.
Claim 12
Dependent Claim
20 words
The article of claim 8 comprising a stopper rod having a nose portion made from said carbon bonded refractory composition.
Claim 13
Dependent Claim
193 words
A submerged tundish shroud for use in continuous casting of molten steel comprising: a body portion of a refractory material having a central axial bore for conveyance of molten steel therethrough from an inlet end to an outlet end of said body; a seating area portion surrounding said bore at the inlet end thereof; a lining portion surrounding said central bore adapted to be in contact with said molten steel and a slagline sleeve portion formed around an exterior circumferential surface of the body adapted to contact a layer of slag in a continuous casting mold, at least one of said seating area portion, lining portion and slagline sleeve portion being made from a carbon bonded refractory composition consisting of, by weight: (a) carbon, from about 4% to about 50%; (b) one or more members selected from the group consisting of zirconium di-boride and titanium di-boride in an amount of from about 10% to about 90%; and (c) one or more members selected from the group consisting of zirconia, SiAlON, clay, alumina, magnesia, silica, silicon carbide, silicon nitride, boron nitride, mullite and chromia in an amount of from about 10% to about 80%.
Claim 14
Dependent Claim
65 words
The tundish shroud of claim 13 wherein at least one of the seating area and slagline sleeve portions is made from a carbon bonded refractory composition consisting of: (a) carbon from about 15% to about 25%; (b) zirconium di-boride from about 30% to about 40%; (c) zirconia from about 30% to about 40%; and further including (d) boron carbide from about 1% to about 5%.
Claim 15
Dependent Claim
59 words
The tundish shroud of claim 13 wherein at least said lining portion is made from a carbon bonded refractory composition consisting of: (a) carbon from about 15% to about 25%; (b) zirconium di-boride from about 55% to about 65%; (c) SiAlON from about 10% to about 20%; and further including (d) boron carbide from about 1% to about 5%.
References Cited (Backward Citations)
No citation records indexed.
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