Abstract: Microlaminated composite articles are made by combining one or more sheets of flexible sintered crystalline ceramic foil with one or multiple inorganic substrate layers, e.g., of metal foil, to form a stack which is then heated below the melting temperatures of the foil and substrate layers, and under slight or moderate pressure, to provide a well-bonded composite article which is essentially free of interlaminar cementing or sealing materials.

Abstract: Hard crystalline sintered ceramic products, and a method for making them at substantially reduced sintering temperatures, are disclosed, the products being manufactured by the sintering of mixtures comprising one or more ceramic powders selected from among zirconia, stabilized zirconia, partially stabilized zirconia, alumina, mullite, cordierite, and MgAl.sub.2 O.sub.4 spinal together with a combination sintering aide including TiO.sub.2 and at least one transition metal oxide selected from the group consisting of copper oxide, manganese oxide, cobalt oxide and zinc oxide, the mixture comprising at least about 3.5 mole percent TiO.sub.2, at least about 1.3 percent of transition metal oxides, about 4.8-50 mole percent total of TiO.sub.2 +transition metal oxides, and the remainder ceramic powder. Sintering of these mixtures at temperatures typically 200.degree.-350.degree. C.