To provide a technology for sintering calcium phosphate to manufacture a calcium phosphate sintered body and suppressing generation of calcium oxide when calcium phosphate is sintered, there is provided a process for manufacturing a sintered calcium phosphate molded body is characterized by including a step for heating a composition containing at least a composite of calcium phosphate fine particles and polyether and sintering the calcium phosphate fine particles.

A preparation method and use of a green fluorescent transparent ceramic are disclosed. The preparation method includes: weighing, according to a stoichiometric ratio, elements present in Ca.sub.3-x-yCe.sub.xA.sub.ySc.sub.2-xB.sub.zSi.sub.3-mC.sub.mO.sub.12, in forms of oxides, carbonates or nitrates as raw materials; mixing the raw materials, annealing, melting at a high temperature, cooling and annealing at a low temperature; putting the glass into a high-temperature furnace, holding, raising the temperature, and performing crystallization and densification sintering; finally cutting, reducing and surface-polishing, where A is at least one from the group consisting of Lu, Y, Gd, La and Na; B is at least one from the group consisting of Zr, Hf and Mg; C is at least one from the group consisting of Al and P; x, y, z and m satisfy 0.001?x?0.06, 0?y?0.06, 0?z?0.06 and 0?m?0.3, respectively.

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.

A fused-cast refractory product including, as mass percentages on the basis of the oxides and for a total of 100% of the oxides: ZrO.sub.2+HfO.sub.2: remainder to 100%, with HfO.sub.25%; SiO.sub.2: 1.5% to 7.5%; Al.sub.2O.sub.3: 1.0% to 3.0%; CaO+SrO: 1.2% to 3.0%; Y.sub.2O.sub.3: 1.5% to 3.0%; Na.sub.2O+K.sub.2O: <0.15%; B.sub.2O.sub.3: <1.0%; P.sub.2O.sub.5: <0.15%; Fe.sub.2O.sub.3+TiO.sub.2: <0.55%; oxide species other than ZrO.sub.2, HfO.sub.2, SiO.sub.2, Al.sub.2O.sub.3, Na.sub.2O, K.sub.2O, B.sub.2O.sub.3, CaO, SrO, Y.sub.2O.sub.3, P.sub.2O.sub.5, Fe.sub.2O.sub.3 and TiO.sub.2: <1.5%.

A varistor composition free of Sb comprising: (a) ZnO; (b) BBiZnPr glass, or BBiZnLa glass, or a mixture thereof; (c) a cobalt compound, a chromium compound, a nickel compound, a manganese compound, or mixtures thereof; (d) SnO.sub.2; and (e) an aluminum compound, a silver compound, or a mixture thereof. By adjusting the ratio between the components, the varistor composition may be made into a multilayer varistor with inner electrodes having a low concentration of noble metals at a sintering temperature less than 1200 C. The multilayer varistor made from the varistor composition has good maximum surge current, good ESD withstand ability, and low fabrication cost.

Disclosed herein is a doped perovskite barium stannate material, which has a chemical general formula of BaA.sub.xB.sub.xSn.sub.1-2xO.sub.3, where A is at least one of In, Y, Bi and La; B is at least one of Nb and Ta, and 0<x?0.025. The doped perovskite barium stannate material disclosed in the invention has a high dielectric constant, low dielectric loss and good temperature-stability, and it can be used not only as low-frequency ceramic capacitor dielectrics, but also as microwave dielectric ceramics because of its excellent microwave dielectric properties, implying the potential application in the field of microwave communication. What's more, disclosed is a method to prepare the doped perovskite barium stannate material and the application of the doped perovskite barium stannate material in a low-frequency ceramic capacitor or microwave communication dielectric ceramics.

An inorganic shell is ball-shaped and hollow, and includes silica and crystalline inorganic powder sintered together. A resin composition has the inorganic shells and the resin composition has certain dieletric characteristics. A method for making the inorganic shell is also provided.

A method for producing a ceramic scintillator comprising the steps of mixing a rare earth compound with sulfuric acid and/or sulfate to cause their reaction to obtain a product; calcining the product to obtain calcined powder; reducing the calcined powder to obtain rare earth oxysulfide powder; molding the rare earth oxysulfide powder to obtain a green body; and sintering the green body; a pulverization step being conducted to adjust the particle sizes of the product and/or the calcined powder at least before the reduction step.

Disclosed are product (e.g., board), slurry, and methods relating to an uncooked starch that can be used to enhance strength in one or more gypsum layers in the board. The uncooked starch has a hot water viscosity of from about 20 BU to about 300 BU according to the HWVA method, and/or a mid-range peak viscosity of from about 120 Brabender Units to about 1000 Brabender Units.

A method for manufacturing an abradable layer and a substrate coated with this layer, may include: preparing a powder composition including at least ceramic particles and an inorganic filler having a lamellar crystallographic structure, the volume content of the inorganic filler in the powder composition being in a range of from 1 to 75%; compressing the powder composition; and sintering the powder composition thus compressed in order to obtain the abradable layer.