Ceramic body formed by reaction sintering at pressures ranging from subatmospheric to superatmospheric of admixed and shaped reactants, which can be elements, compounds, intermetallic compounds and/or alloys, in stoichiometric proportions to substantially form 5-95 mole percent of nitride phase or phases of one or both of Al and Si, and 5-95 mole percent of second phase or phases being boride, carbide, silicide and/or sulfide of one or more of elements of Groups 3b including lanthanide and actinide series elements, 4b, 5b, and 6b, which phases have a maximum grain size substantially not greater than 10 mu m and which body contains 0 to 4 weight percent oxygen. Such ceramic body is useful as part of a component in an electrolytic cell used in aluminum production.
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