Abstract:
The invention provides an amorphous fine-particle powder capable of giving a perovskite-type barium titanate fine powder which has stable quality and is free from residual by-products such as barium carbonate; and a process for the production of the fine-particle powder. An amorphous fine-particle powder which contains titanium, barium, lactic acid, and oxalic acid and has a mean particle diameter of 3µm or below, a BET specific surface area of 6m 2 /g or above and a Ba/Ti molar ratio of 0.98 to 1.02 and which is in an amorphous state as determined by X-ray diffraction and exhibits peaks at 1120 to 1140cm -1 and at 1040 to 1060cm -1 respectively in the infrared absorption spectrum; and a process for the production of an amorphous fine-particle powder by bringing, in a solvent containing an alcohol, a solution (A) containing a titanium component, a barium component, and a lactic acid component into contact with a solution (B) containing an oxalic acid component.
Abstract:
A solid oxide fuel cell that is capable of increased power density is disclosed. A ceramic electrolyte comprising at least one surface, wherein at least a portion of at least one surface is substantially free of segregated impurities is also disclosed. A solid oxide fuel cell comprising an anode and a cathode, each comprising an active surface, and an electrolyte having a surface, wherein at least a portion of each of the cathode active surface, the anode active surface, and the electrolyte surface are substantially free of segregated impurities is also disclosed. Methods for removing at least a portion of a segregated impurity from a solid oxide fuel cell either prior to or during assembly, or after a period of fuel cell operation are also disclosed.
Abstract:
Process for preparing granules of oxidic or nonoxidic metal compounds, characterized in that a dispersion which comprises water, oxidic or nonoxidic metal compounds and at least one dispersant is spray-dried, - where the proportion of oxidic or nonoxidic metal compounds is 40 to 70% by weight and the sum of the proportions of water and the particles is at least 70% by weight and - the particles have a BET surface area of 20 to 150 m 2 /g and a median of the particle size of less than 100 nm, - where the dispersant is present in the dispersion with a proportion of 0.25 to 10% by weight based on the oxidic or nonoxidic metal compounds and - where the spray-drying is performed by atomization with air in the cocurrent principle or fountain principle, and an air inlet temperature of 170 to 300°C and an air outlet temperature of 90 to 130°C are selected.
Abstract:
The invention relates to fine-particled alkaline-earth titanates and to a method for the production thereof by reacting alkaline-earth metal compounds with titanium dioxide particles. The titanium dioxide particles have a BET-surface area of more than 50 m2/g. The titanium dioxide particles can have a very low sulphate, chloride and carbon content. The reaction can take place temperatures below 700° C. The alkaline-earth titanate can have a BET-surface area ranging from 5 - 100 m2/g. Advantageously, it does not contain any hydroxyl groups embedded in the crystal lattice. The alkaline-earth titanate can be used in the production of microelectronic components.
Abstract:
The present invention provides a perovskite titanium-containing composite oxide fine particle represented by the formula: (A1 X A2 (1-X)) YTi03±δ (wherein 0≤X≤1, 0. 98≤Y≤l. 02, 0≤δ≤0.05, Al and A2 each is an atom selected from a group consisting of Ca, Sr, Ba, Pb and Mg and are different from each other), wherein the specific surface area is from 1 to 100 m 2 /g and the D2/Dl value is from 1 to 10.
Abstract translation:本发明提供一种由式(A1XA2(1-X))YTiO3±δ表示的钙钛矿含钛复合氧化物细颗粒(其中0 <= X <= 1,0.098 <= Y <= 1.0 ,0≤δ≤0.05,Al和A2各自为选自Ca,Sr,Ba,Pb和Mg的原子,彼此不同),其中比表面积为1〜100μm <2 / g,D2 / D1值为1〜10。
Abstract:
A ceramic material made from a precursor mixture including bottom ash particles recovered from a municipal solid waste combustor and fly ash particles recovered from combustion residual gases of a municipal solid waste combustor. In a process for manufacturing a technical ceramic from combined MWC ash, bottom ash particles are recovered from a municipal solid waste combustor and fly ash particles are recovered from combustion residual gases of a municipal solid waste combustor. The bottom ash particles are mixed with the fly ash particles to form a precursor combined ash mixture, which is cast to form the ceramic material.
Abstract:
An improved method is disclosed for processing aluminum dross containing fluxing salts to provide a fired inorganic or ceramic product wherein the dross is processed to remove the fluxing salts therefrom, and a non-metallic product is recovered. The dross is processed through a crusher (10) and the reduced fragments (10(a)) are classified by passing over a screen (12). A portion of the classified material is fed into a digester (14) and a wet screen (16) is used to screen the digested material. A portion of the screened material is sent to a dryer (18), passed through a dry screen (20) and fed to a furnace (22). The improved process comprises mixing the non-metallic product with water and alkali matrials to form a slurry and adding acid to neutralize the slurry. The slurry is adjusted by adding one of silica and alumina and the slurry is heated to form a fired product (fig. 2).
Abstract:
The present invention relates to a new process for manufacturing a silicon carbide (SiC) coated body by depositing SiC in a chemical vapor deposition method using dimethyldichlorosilane (DMS) as the silane source on a graphite substrate. A further aspect of the present invention relates to the new silicon carbide coated body, which can be obtained by the new process of the present invention, and to the use thereof for manufacturing articles for high temperature applications, susceptors and reactors, semiconductor materials, and wafer.
Abstract:
An oxide superconductor includes: REBa 2 Cu 3 O 7-x (RE being one element selected from a "RE. element group" of Pr, Nd, Sm, Eu, Gd, Y, Tb, Dy, Ho, Er, Tm, Yb, and Lu). The RE includes at least three types of metallic elements (M1, M2, and M3), and the three types of metallic elements are any element of the RE element group selected in order. In an oxide system satisfying R(M1) ≤ 20 mol% and R(M2) ≥ 60 mol% and R(M3) ≤ 20 mol%, R(M1) being an average metallic element ratio of M in M1 + M2 + M3, SD(Ms)>0.15 is satisfied at a position at 50% of an average film thickness of a cross section including the c-axis, Ms being the metallic element of not larger of R(M1) and R(M3), SD(Ms) being a standard deviation/average value of a concentration of Ms.