An amorphous mesoporous alumina having a connectivity (Z) greater than 2.7 is described. The present invention also relates to the process for preparing the said alumina, comprising at least one precipitation step of at least one aluminum salt, at least one heating step of the suspension obtained, a thermal treatment step to form the alumina gel, a gentle drying step or spray drying step, a moulding step of the powder obtained, and a final thermal treatment step in order to obtain the alumina.

Described herein are cold-sintered ceramic polymer composites and processes for making them from ceramic precursor materials and monomers and/or oligomers. The cold sintering process and wide variety of monomers permit the incorporation of diverse polymeric materials into the ceramic.

A manufacturing method for a ceramic matrix composite, having a woven fabric that has multiple fiber bundles and having a matrix that is disposed in the gaps between the fiber bundles, includes: a green body formation step for forming a green body by sintering the woven fabric infiltrated with a polymer that is a precursor to the matrix; and a densification step for further infiltrating the green body with a polymer and sintering same. The densification step includes: a second infiltration step for further infiltrating the green body with a polymer so as to form an infiltrated green body; a drying step for drying the infiltrated green body so as to form a dried green body; a steam treatment step for leaving the dried green body under saturation water vapor pressure so as to form a treated green body; and a sintering step for sintering the treated green body.

Ceramic composite materials, devices and methods are shown. In selected examples, ceramic materials are processed at low temperatures that permit incorporation of low temperature components, such as polymer components. manufacturing methods include, but are not limited to, injection molding, autoclaving and calendaring.

A method for producing a barium titanate-based powder that includes mixing a titanium compound and a barium compound together with water and chlorine to prepare a slurry, and temporarily firing the mixture of the titanium compound and the barium compound which is contained in the slurry to provide a barium titanate-based powder. The chlorine in the slurry is in the form of chlorine ions in a ratio of 230 to 1100 wt ppm based on the amount of the barium titanate-based powder to be synthesized.

A process for the production of compressed hydrogen in a membrane reactor, said membrane reactor comprising a first zone separated by a proton conducting membrane from a second zone, said first zone having a gas inlet and a product outlet and said second zone having a product outlet; said process comprising; a. feeding a gas comprising ammonia to said first zone via said gas inlet, and allowing a reaction to take place in said first zone so that hydrogen and nitrogen are formed; b. applying an electric field over said proton conducting membrane; c. allowing hydrogen to dissociate into electrons and protons to selectivity pass through the proton conducting membrane to said second zone where protons and electrons recombine to form hydrogen in the second zone; wherein the membrane reactor comprises a pressure regulator at said product outlet from said second zone so that, in operation, the partial pressure of hydrogen in the second zone is higher than the partial pressure of hydrogen in the first zone.

A ceramic electronic component includes: a ceramic body that includes internal electrodes; and an external electrode that includes a plurality of crystal particles containing Ba, Zn, Si, and O, the external electrode being formed on a surface of the ceramic body and connected to the internal electrodes.

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.

An amorphous mesoporous alumina with a median mesopore diameter by volume of 16 nm or more, a mesopore volume of 0.5 mL/g or more, and a total pore volume of more than 0.75 mL/g. A process for preparing said alumina, comprising: a) precipitating a basic precursor and an acidic precursor, at least one of which comprises aluminum, at a pH of 8.5 to 10.5, a temperature of 20 C. to 90 C. and for 2 minutes to 30 minutes, with a state of advance of 5% to 13%; b) heating the suspension; c) a second precipitating by adding another basic precursor and acidic precursor, at least one of which comprises aluminum, at a pH of 8.5 to 10.5, a temperature of 40 C. to 90 C. and for 2 to 50 minutes, with a state of advance of 87% to 95%; d) filtration; e) drying; f) shaping; g) heat treatment.

Cold sintering of materials includes using a process of combining at least one inorganic compound, e.g., ceramic, in particle form with a solvent that can partially solubilize the inorganic compound to form a mixture; and applying pressure and a low temperature to the mixture to evaporate the solvent and densify the at least one inorganic compound to form sintered materials.