A method for producing a ceramic article, the method comprising the steps of: a) freeze casting a green body; b) firing the green body to form a sintered body having residual porosity; c) impregnating the sintered body with a first impregnant material to form a barrier layer beneath the surface of the sintered body; d) impregnating remaining surface porosity of the sintered body with a second impregnant comprising a ceramic precursor other than a precursor for chromium oxide; and e) firing the sintered body to decompose the ceramic precursor to form ceramic.
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