Organic solvent based slurry compositions for making an environmental barrier coating including from about 6.8 wt % to about 96.1 wt % solvent; from about 3.9 wt % to about 93.2 wt % primary material; and from about 0.01 wt % to about 20 wt % slurry sintering aid.

A perovskite ceramic composition that contains Sn, Ba, and Ti, and where the Sn content is within a range of about 0.001 parts by molSnabout 0.999 parts by mole with respect to 100 parts by mole of the Ti. The perovskite ceramic composition can be used in a composition that further includes a rare earth element R, Mn, and Si, and optionally Mg, where proportions of the R, the Mn, the Si, and the optional Mg, satisfy R: 0<Rabout 10 parts by mole, Mn: 0<Mnabout 5 parts by mole, Si: 0<Siabout 5 parts by mole Mg: 0<Mgabout 5 parts by mole with respect to 100 parts by mole of Ti.

Provided is a porous honeycomb filter comprising a porous first cell wall that permits exhaust gas to permeate, a second cell wall that permits exhaust gas to permeate than the first cell wall, and a cell that is surrounded by the first cell wall and the second cell wall to form an extending gas flow passage. The second cell wall has a smaller porosity than the first cell wall.

LTCC devices are produced from dielectric compositions comprising a mixture of precursor materials that, upon firing, forms a dielectric material comprising a barium-tungsten-silicon host.

A low K value, high Q value, low firing dielectric material and method of forming a fired dielectric material. The dielectric material can be fired below 950 C. or below 1100 C., has a K value of less than about 8 at 10-30 GHz and a Q value of greater than 500 or greater than 1000 at 10-30 GHz. The dielectric material includes, before firing a solids portion including 10-95 wt % or 10-99 wt % silica powder and 5-90 wt % or 1-90 wt % glass component. The glass component includes 50-90 mole % SiO.sub.2, 5-35 mole % or 0.1-35 mole % B.sub.2O.sub.3, 0.1-10 mole % or 0.1-25 mole % Al.sub.2O.sub.3, 0.1-10 mole % K.sub.2O, 0.1-10 mole % Na.sub.2O, 0.1-20 mole % Li.sub.2O, 0.1-30 mole % F. The total amount of Li.sub.2O+Na.sub.2O+K.sub.2O is 0.1-30 mole % of the glass component. The silica powder can be amorphous or crystalline.

The process of the invention presents a simple, effective and continuous process for producing slabs and panels from compositions free from ceramic components or ceramic binders.

The invention relates to a persistent phosphorescent ceramic composite material which is a sintered dense body comprising two or more phases, a first phase consisting of at least one metal oxide and a second phase consisting of a metal oxide containing at least one activating element in a reduced oxidation state. The invention furthermore relates to a method for the preparation of a phosphorescent ceramic composite material as defined in any of the previous claims, the method comprising the following steps: preparing a mixture of a metal oxide and a phosphor; fabricating a green body from the mixture; and heat treating the green body in a reducing atmosphere.

A heat moldable composition which useful for preparing ceramic bodies comprises an inorganic material that sets as a result of baking or sintering, and a hydroxypropyl methylcellulose having a DS of at least 1.4 and an MS of at least 0.6, wherein DS is the degree of substitution of methoxyl groups and MS is the molar substitution of hydroxypropoxyl groups, and a viscosity of up to 80 mPa.Math.s, determined as a 2% by weight solution in water at 20 C., wherein the heat moldable composition comprises at least 40 weight percent of the inorganic material and at least 10 weight percent of the hydroxypropyl methylcellulose, and wherein the composition does not comprise more than 5 weight percent of water, all percentages being based on the total weight of the composition.

Exemplary embodiments relate to a batch for producing an unshaped refractory ceramic product, to a method for producing a fired refractory ceramic product, to a fired refractory ceramic product and to the use of an unshaped refractory ceramic product.

A composite dielectric ceramic material having anti-reduction and high temperature stability characteristics includes the main component of (1-x)(BaTiO.sub.3)-x(Ba.sub.2LiTa.sub.5O.sub.15) formulated in accordance with the relative molar ratio of up to 100 mole composite dielectric ceramics and a predetermined ratio of one or multiple oxide subcomponents corresponding to 100 moles of the main component. The oxide subcomponents of Li.sub.2TiO.sub.3, BaSiO.sub.3, (Ba.sub.0.6Ca.sub.0.4)SiO.sub.3 and SiO.sub.2 can be used as sintering aids to provide a sintering promotion effect. The oxide subcomponents of CaO, MnO, MgO can also be selected used to improve dielectric stability. More particularly, CaO has the advantages of improving the anti-reduction ability and increasing the coefficient of resistance. Therefore, with the adding of the oxide subcomponents and their interactions, the rate of change of the TCC curve of the composite dielectric ceramic material (1-x)(BaTiO.sub.3)-x(Ba.sub.2LiTa.sub.5O.sub.15) in the temperature range of 55 C.200 C. is significantly inhibited, and its dielectric constant (k-values) is also well improved.