Liner for submerged entry nozzle
AssigneeVesuvius Crucible Company
InventorPaul M. Benson
Life of this patent
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Abstract
A fired carbon-bonded, oxide refractory body for use in casting aluminum-killed steel has a metal contacting surface which is resistant to both steel erosion and buildup of alumina. The layer is formed by first firing the pressed body in an oxidizing atmosphere to form a porous oxidized zone on selected steel contacting surfaces. The remaining surface portions of the body are protected against oxidation during firing by a glaze applied prior to firing. A carbon free refractory slip or slurry is infiltrated into the porous oxidized zone to create the erosion and buildup resistant surface layer. A preferred infiltrant material is alumina.
Claims19
A carbon-bonded refractory body having a metal contacting surface resistant to alumina buildup, said surface consisting essentially of a carbon free, oxidized zone formed in said surface and a carbon free refractory material infiltrated into said carbon free, oxidized zone.
A refractory nozzle for use in casting aluminum-killed steel comprising:
- a body made from a fired, carbon-bonded, alumina-graphite refractory material, said body having a metal teeming bore therethrough;
- a glazed layer covering surface portions of said body external of said bore;
- a carbon free, oxidized zone formed in said body surrounding said bore;
- and
- a layer of refractory material infiltrated into said oxidized zone, said refractory material selected from the group consisting of alumina, silica, zirconia and SiAlON, whereby in use said infiltrated refractory layer resists buildup of alumina thereon.
A method for making a refractory article having a metal contacting surface resistant to steel erosion and buildup of alumina when casting aluminum-killed steels comprising:
- forming a shaped body of a carbon containing refractory material;
- applying a glaze to selected surface portions of said body, said erosion and buildup resistant surface being free of said glaze;
- firing said selectively glazed body in an oxidizing atmosphere to densify said body;
- forming an oxidized zone in the body along the glaze free surface thereof;
- and
- infiltrating said oxidized zone with a carbon free refractory material.
A refractory nozzle for use in casting steel comprising:
- a body made from a fired, carbon-bonded, alumina-graphite refractory material, said body having a metal teeming bore therethrough;
- a carbon free, oxidized zone formed in said body surrounding said bore;
- and
- a layer of carbon free refractory material infiltrated into said carbon free oxidized zone, whereby in use said infiltrated refractory layer resists buildup of oxide deposits thereon.
Dependencies are inferred from the claim text.