| abstract |
DENSE COMPOSITIONS HAVING A GRAIN SIZE SMALLER THAN 10 MICRONS AND CONTAINING FROM 20 TO 80 VOLUME PERCENT ALUMINA; 10 TO 78 VOLUME PERCENT OF A METALLINE SELECTED FROM THE GROUP CONSISTING OF TITANIUM CARBIDE, TITANIUM NITRIDE, ZIRCONIUM AND CARBIDE, ZIRCONIUM NITRIDE, NIOBIUM CARBIDE, NIOBIUM NITRIDE, TANTALUM CARBIDE, TANTALUM NITRIDE, AND MIXTURES THEREOF; AND 2 TO 30 VOLUME PERCENT OF AN INTERMETALLIC SELECTED FROM THE GROUP CONSISTING OF IRON ALUMINIDE, IRON TITANIDE, COBALT ALUMINIDE, COBALT TITANIDE, NICKEL ALUMINIDE, NICKEL TITANIDE, TUNGSTEN ALUMINIDE, MOLYBDENUM ALUMINIDE, NIOBIUM ALUMINIDE, TANTALUM ALUMINIDE, TITANIUM ALUMINIDE, ZIRCONIUM ALUMINIDE, AND MIXTURES THEREOF, ARE (1) EFFECTIVE TOOLS FOR CUTTING STEEL AND CAST IRON AND (2) USEFUL AS OXIDATION RESISTANT MATERIALS OF CONSTRUCTION. |