The dielectric ceramic has a composition represented by general formula 100(Ba.sub.1-x-ySr.sub.xCa.sub.y).sub.m(Ti.sub.1-zZr.sub.z)O.sub.3+aBaO+b- R.sub.2O.sub.3+cMgO+dMnO+eCuO+fV.sub.2O.sub.5+gX.sub.uO.sub.v (where R is a rare-earth element such as La, Ce or Pr; and X.sub.uO.sub.v is an oxide group including at least Si); and 0.ltoreq.x.ltoreq.0.05, 0.ltoreq.y.ltoreq.0.08 (preferably 0.02.ltoreq.y.ltoreq.0.08), 0.ltoreq.z.ltoreq.0.05, 0.990.ltoreq.m, 100.2.ltoreq.(100 m+a).ltoreq.102, 0.05.ltor...

A ceramic fiber-ceramic composite filter having a support composed of ceramic fibers, preferably texturized, a carbonaceous layer thereover, and a silicon carbide coating over the carbonaceous layer and coated on substantially all of the fibers. A strong, tough, light weight filter is achieved which is especially useful in high temperature gas environments.

Calcia-partially-stabilized zirconia ceramic materials which contain between 3.3 and 4.7 percent of calcia by weight. Such materials have a fine-scale two-phase microstructure substantially consisting of metastable, tetragonal domains of a critical size within cubic matrix grains, which domains, in regions of high stress, irreversibly transform to normal monoclinic form upon stressing of the body. The materials are produced by firing a zirconia body containing between 3.3 and 4.7 percent by weig...

Production of a sintered ceramic dielectric formed from a green sheet having a uniform microporous structure providing uniform dielectric properties and compressibility for lamination of stacked green sheets into a unitary laminate which may be provided with an internal pattern of electrical conductors extending therein. The structure is obtained by blending the ceramic particulate in a solution of a binder resin miscible in a solvent mixture which is formed from a volatile solvent for the binde...

Ceramic semiconductor materials of positive temperature coefficient of resistivity characterized by low room temperature resistivity, by very high peak resistivity and by excellent voltage sensitivity properties are economically produced by sintering in air. Barium and other titanate, stannate and zirconate bases are combined with silicon oxide, with manganese or ruthenium oxide and with selected rare earth oxide additives in proportions which are particularly adapted to consistently provide the...

Production of a sintered ceramic dielectric formed from a green sheet having a uniform microporous structure providing uniform dielectric properties and compressibility for lamination of stacked green sheets into a unitary laminate which may be provided with an internal pattern of electrical conductors extending therein. The structure is obtained by blending the ceramic particulate in a solution of a binder resin miscible in a solvent mixture which is formed from a volatile solvent for the binde...

A novel ceramic form of hydroxylapatite and a novel ceramic product comprising a mixture of the latter and whitlockite, the preparation of these ceramics and dental restorative compositions and dental and surgical prosthetic materials containing the same are disclosed. Also described is a novel and improved process for producing polycrystalline ceramic oxides.

A ceramic filter comprising a plurality of three-terminal, dual-mode ceramic filter elements which are connected with each other through a capacitive coupling circuit which is adapted to increase the input/output impedance of the ceramic filter.

The invention concerns a densely sintered ceramic dielectric with a loss factor less than or equal to 1.times.10.sup.-3 and a substantially linear temperature dependence of the capacitance based on TiO.sub.2 and/or ZrO.sub.2, and/or the compounds of TiO.sub.2, ZrO, Nb.sub.2 O.sub.5 and/or Ta.sub.2 O.sub.5 with oxides of the alkali metals, alkaline earth metals or rare earth metals in the form generally used for the production of ceramic dielectrics.

Ceramic decalcomania for the production of overglaze decorations on ceramic ware which include, in addition to the design layer, two separate layers of powdered glass acting in combination during firing to seal off corrosive glass-pigment interactions and provide fired decorations of improved detergent durability are described.