Silicon nitride bonded magnesia refractory and method
AssigneeDresser Industries, Inc.
InventorsHoward M. Winkelbauer, Ke-Chin Wang
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Abstract
A mix for forming a silicon nitride bonded magnesia refractory shape consisting essentially of; for each 100 wt. % thereof at least, about 3 to 20 wt. % of a high purity silicon powder containing no more than about 0.2 wt. % metallic impurities and, correspondingly, 97 to 80 wt. % of a high purity magnesite; and the resultant refractory shape formed after shaping of the mix and nitriding thereof and the method of making such shape.
Claims8
A silicon nitride bonded magnesia refractory shape formed by nitriding a mix consisting essentially of;
- for each 100 wt.% thereof, at least about 3 to 20 wt.% of a high purity silicon powder containing no more than about 0.2 wt. % metallic impurities and, correspondingly, 97 to 80 wt.% of a high purity deadburned magnesite to convert said silicon powder into a bonding silicon nitride phase.
The method of making a silicon nitride bonded magnesia refractory shape suitable for use in processing molten aluminum and its alloys comprising admixing from about 3 to 20 wt.% of a high purity silicon powder containing no more than about 0.2 wt.% metallic impurities with correspondingly 97 to 80 wt.% of a high purity deadburned magnesite, and for each 100 wt.% of said silicon powder and magnesite, about 0 to 6 wt.% of a temporary binder, forming the mixture into the shape desired, and nitriding the formed shape to convert the silicon powder into a bonding silicon nitride phase.
Dependencies are inferred from the claim text.