Silicon carbide ceramics containing a dispersed high metal content silicide phase
AssigneeHercules Incorporated
InventorRoger L. K. Matsumoto
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Abstract
A sintered silicon carbide product having improved fracture toughness contains from 1% to 80% by weight of (a) a uniformly dispersed, nonagglomerated, high metal content silicide of iron, nickel, cobalt or molybdenum in which the metal/silicon ratio is equal to or greater than 1. The silicon carbide starting material can be alpha-phase, beta-phase or a mixture of the two.
Claims12
A sintered ceramic product consisting essentially of (1) from about 20% to about 98% of alpha-phase, beta-phase or a mixture of alpha- and beta-phase silicon carbide, (2) from about 1% to about 80% of a nonagglomerated, uniformly dispersed, high metal content silicide selected from the group consisting of Mo.sub.5 Si.sub.3, Fe.sub.2 Si, Co.sub.2 Si, Ni.sub.2 Si and Fe.sub.3 Si, and (3) from 0.02% to about 20% of at least one oxide, nitride or silicate of an element selected from UIPAC Groups 2, 3, 4, 13, or the lanthanide series, all percentages being by weight based on the total weight of the composition.
Dependencies are inferred from the claim text.