Process of manufacture of a zirconia-based black article and a decorative black zirconia-based article obtained by this process.

摘要

Mfr. of a black zirconia-based article involves (a) forming a first mixt. of zirconia powder, 3-70 wt.% stabiliser (selected from Y, Mg, Ce and Ca oxides) and 1-10 wt.% pigment (selected from a cobalt oxide plus iron oxide powder or a CoFe2O4 spinel powder); (b) forming a second mixt. of the first mixt. and a binder; (c) granulating the mixt. and moulding to a blank of the desired article shape; (d) sintering in air for ≥ 30 mins. at <1400 degrees C (when the pigment comprises Co and Fe oxides) or below 1600 degrees C (when the pigment is CoFe2O4 spinel); and (e) polishing. Also claimed is a black decorative zirconia-based article, pref. made by the above process.