High temperature refractory of MgCr.sub.2 O.sub.4 matrix and unstabilized ZrO.sub.2 particles
AssigneeThe United States of America as represented by the United States Department of Energy
InventorsJitendra P. Singh, Jawana J. James, John J. Picciolo
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Abstract
A high chromia refractory composite has been developed with improved thermal shock resistance and containing about 5-30 wt. % of unstabilized ZrO.sub.2 having a temperature-dependent phase change resulting in large expansion mismatch between the ZrO.sub.2 and the chromia matrix which causes microcracks to form during cooling in the high chromia matrix. The particle size preferably is primarily between about 0.6-5 microns and particularly below about 3 microns with an average size in the order of 1.2-1.8 microns.
Claims4
A sintered refractory product consisting essentially of MgCr.sub.2 O.sub.4 as a matrix and about 5-30 wt. % unstabilized ZrO.sub.2 formed from particlcs of ZrO.sub.2 having an average size below about 5 microns and above about 0.6 microns.
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