Norton Company

Louis J Trostel, Jr

Malcolm E Washburn

Anthony K Butkus

Cecil M Jones

Neil N Ault

A refractory product is shown in the form of a dense sintered alumina-chromia, zirconia-alumina-silica, zirconia-alumina body, or zirconia-chromia-alumina having less than about 8% of homogeneously distributed closed porosity formed by sintering an intimate interdispersion of fine particles of alumina-chromia, zirconia-alumina-silica, zirconia-alumina, or zirconia-chromia-alumina.

Furnance having dense refractory oxide liner

A novel raw batch and improved fired refractory cement is described. A bulk refractory grain mass is initially bonded with a fired bond, which upon being fired includes Si.sub.3 N.sub.4 and/or Si.sub.2 ON.sub.2 reaction component that better protects the ultimate high temperature sintered cement product from erosion when the cement is used as a liner for furnace walls, troughs, and runners that contain a flow of molten iron or slag, as well as induction furnaces which process corrosive slag.

Refractory cement

A polycrystalline monolithic sintered alumina refractory body (for use as kiln furniture, and crucibles or nozzles for containment of molten metal) is of fine crystalline sintered aluminum oxide including 15 to 44% by weight of grains of silicon carbide dispersed throughout, such silicon carbide preferably having a sizing between 6 and 46 mesh, but in any case at least 75% being coarser than 100 mesh, such bodies having superior thermal stability and shock resistance.

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Princeton, MA, United States of America

Louis J Trostel, Jr