Ceramic compositions
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United States of America Patent
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N/A
Issued Date -
Nov 1, 2001
app pub date -
May 31, 2001
filing date -
Jul 5, 1996
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Ceramic compositions which are of particular value in the handling or casting of steel, for example as lining materials or for producing nozzles or shrouds used in continuous casting, comprise a mixture of particles of boron nitride, zirconium diboride and at least one other refractory material, bonded together by carbon produced by the decomposition of an organic binder such as a resin or pitch. The other refractory material may be for example a refractory metal, an oxide, a carbide, a boride or a nitride. Zirconium oxide containing compositions comprising 5-70% by weight boron nitride, 5-60% by weight zirconium diboride and 5-80% by weight of zirconium oxide are particularly suitable for forming at least that part of a nozzle which in use is at the slag line in a molten steel vessel. Aluminum oxide containing compositions comprising 5-70% by weight boron nitride, 15-50% by weight zirconium diboride and 10-70% by weight aluminum oxide are particularly suitable for forming the inside of nozzles as they resist alumina build up and prevent clogging of the nozzles.
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