A sintered, fine grained, polycrystalline, essentially fully dense, essentially single phase Cr2O3 body is prepared by sintering Chromium Sesquioxide (Cr2O3) at essentially the equilibrium oxygen partial pressure (PO2) for the formation of CrO 3 from its elements at the sintering temperature. To achieve optimum theoretical density a second metal oxide dopant such as MgO, capable of controlling the grain size, is added. In addition, Cr2O3 bodies are rendered more stable, and thus have a longer life, by maintaining over the body an atmosphere which is essentially equilibrium Po, for the formation of Cr2O3, from its elements at that temperature.
P. D. Ownby, "Dense Chromium Sesquioxide," U.S. Patents, Oct 1977.
Materials Science and Engineering
Patent Application Number
18 Oct 1977