The present invention relates to a sintering agent for dry particulate refractory compositions and dry particulate refractory compositions. The use of dry particulate refractory compositions also form part of the present invention.

A lead-free piezoelectric ceramic sensor material and a preparation method thereof, and relates to the technical field of piezoelectric ceramic processing. The main raw materials of the lead-free piezoelectric ceramic sensor material disclosed in the present disclosure are a barium carbonate, a calcium carbonate, a zirconia, a titanium dioxide, a strontium carbonate, an oxidation bait, a bismuth oxide, a composite binder and a dispersant agent. The preparation method is prepared through the steps of preparing ingredients, ball milling, granulating and tableting, debinding, and sintering, and the lead-free piezoelectric ceramic sensor material can be made into a lead-free piezoelectric sensor through applying an electrode and electrode polarizing. The present disclosure has an excellent compactness and a good chemical stability. And the piezoelectric sensor made of the lead-free piezoelectric ceramic sensor material has a high sensitivity, a strong working stability, an excellent piezoelectric and has a high Curie temperature.

A method for manufacturing a sintered body, the method including heating a mixture that contains a plurality of particles of a metal oxide having a spinel-type structure, and a metal acetylacetonate under pressure at a temperature of from a melting point or higher of the metal acetylacetonate to 600° C. or lower, to form a sintered body that contains the metal oxide having the spinel-type structure.

A method for manufacturing a sintered body, the method including heating a mixture that contains a plurality of particles of a metal oxide having a spinel-type structure, and a metal acetylacetonate under pressure at a temperature of from a melting point or higher of the metal acetylacetonate to 600° C. or lower, to form a sintered body that contains the metal oxide having the spinel-type structure.

Fiber-reinforced composite (e.g., for portable electronic devices), and methods of molding such fiber-reinforced composite parts. Such a fiber-reinforced composite part comprises one or more fiber layers and a plurality of ceramic particles within a polymer matrix such that ceramic particles and polymer are disposed above and below each of the fiber layer(s), with the ceramic particles comprising from 30% to 90% by volume of the composite part, the polymer matrix comprising from 6% to 50% by volume of the composite part, and the fiber layer(s) comprising from 1% to 40% by volume of the composite part; the ceramic particles having a Dv50 of from 50 nanometers to 100 micrometers; the ceramic particles being substantially free of agglomeration; and the composite part having a relative density greater than 90%. The present methods of molding such fiber-reinforced composite parts comprise: disposing one or more fiber layers in a working portion of a cavity in a mold such that the fiber layer(s) extends laterally across the composite part; and disposing ceramic particles and polymer above and below each of the fiber layer(s) in the working portion; heating the mold to a first temperature that exceeds a melting temperature (Tm) of the first polymer; subjecting the polymer, ceramic particles, and fiber layer(s) in the mold to a first pressure while maintaining the temperature of the mold to or above the first temperature to define a composite part in which the ceramic particles are substantially free of agglomeration; cooling the housing component to a temperature below the Tg or Tm of the first polymer; and removing the housing component from the mold. In some such methods, the core-shell particles comprise a ceramic core comprising a particle of a ceramic, and a polymer shell around the core, the shell comprising a polymer, where the ceramic cores comprise from 50% to 90% by volume of the powder, and the polymer shells comprise from 10% to 50% by volume of the powder. In such composite parts and methods, the ceramic particles comprise Al.sub.2O.sub.3, Fe.sub.3O.sub.4, Fe.sub.2O.sub.3, ZnO, ZrO.sub.2, SiO.sub.2, and/or a combination of any two or more of these ceramics; and the polymer comprises PPE, PPS, PC copolymers, PEI, PEI copolymers, PPSU, PAES, PES, PAEK, PBT, PP, PE, semi-crystalline PI, or semi-crystalline polyamide.

Fiber-reinforced composite (e.g., for portable electronic devices), and methods of molding such fiber-reinforced composite parts. Such a fiber-reinforced composite part comprises one or more fiber layers and a plurality of ceramic particles within a polymer matrix such that ceramic particles and polymer are disposed above and below each of the fiber layer(s), with the ceramic particles comprising from 30% to 90% by volume of the composite part, the polymer matrix comprising from 6% to 50% by volume of the composite part, and the fiber layer(s) comprising from 1% to 40% by volume of the composite part; the ceramic particles having a Dv50 of from 50 nanometers to 100 micrometers; the ceramic particles being substantially free of agglomeration; and the composite part having a relative density greater than 90%. The present methods of molding such fiber-reinforced composite parts comprise: disposing one or more fiber layers in a working portion of a cavity in a mold such that the fiber layer(s) extends laterally across the composite part; and disposing ceramic particles and polymer above and below each of the fiber layer(s) in the working portion; heating the mold to a first temperature that exceeds a melting temperature (Tm) of the first polymer; subjecting the polymer, ceramic particles, and fiber layer(s) in the mold to a first pressure while maintaining the temperature of the mold to or above the first temperature to define a composite part in which the ceramic particles are substantially free of agglomeration; cooling the housing component to a temperature below the Tg or Tm of the first polymer; and removing the housing component from the mold. In some such methods, the core-shell particles comprise a ceramic core comprising a particle of a ceramic, and a polymer shell around the core, the shell comprising a polymer, where the ceramic cores comprise from 50% to 90% by volume of the powder, and the polymer shells comprise from 10% to 50% by volume of the powder. In such composite parts and methods, the ceramic particles comprise Al.sub.2O.sub.3, Fe.sub.3O.sub.4, Fe.sub.2O.sub.3, ZnO, ZrO.sub.2, SiO.sub.2, and/or a combination of any two or more of these ceramics; and the polymer comprises PPE, PPS, PC copolymers, PEI, PEI copolymers, PPSU, PAES, PES, PAEK, PBT, PP, PE, semi-crystalline PI, or semi-crystalline polyamide.

A prepreg including a support with, for more than 90% of the weight thereof, of ceramic fibers, and a thermoreversible liquefiable gel covering, at least in part, at least one portion of the ceramic fibers. The liquefiable gel including: 20% to 60% of ceramic particles and 0% to 10% of metal particles, both as percentage by volume based on the volume of the liquefiable gel; 0.2% to 10% of a thermoreversible hydrocolloid and 0% to 7% of one or more other constituents, both as a percentage by weight on the basis of the total weight of the ceramic particles and metal particles; the balance to 100% being water. It being possible for the ceramic particles and the metal particles to be replaced, partially or completely, by precursors of ceramic particles and of metal particles, respectively, capable of forming, by heat treatment above 200° C., ceramic particles and metal particles, respectively.

This invention relates to a ceramic module for assembly into a therapeutic device for treating a human or animal body with irradiation of far infrared. More specifically, said ceramic module can simultaneously emit blackbody-like thermal radiation and stimulated FIR-photons radiation in 3-16 μm wavelength spectrum, while the overall radiation in 8-14 μm wavelength range is measured to be an approximated blackbody radiation at a temperature that is at least 1 °K. (or 1 °C.) higher than the actual body temperature of said ceramic module, signifying an effective emissivity greater than 1.0. Said ceramic module may be used alone or serve as components of a therapeutic device for increasing physiologic performance, immune competence, health, and mean lifespan of human or animal.

What are described are a process for producing an insulating product for the construction materials industry or an insulating material as intermediate for production of such a product, and a corresponding insulating material/insulating product. Also described are the use of a matrix encapsulation method for production of composite particles in the production of an insulating product for the construction materials industry or of an insulating material as intermediate for production of such a product, and the corresponding use of the composite particles producible by means of a matrix encapsulation method.

A three-dimensional (3D) printing device presented in this invention has a novel printing head design that can be used with a cost-effective 3D printing ink based on cost-competitive camphene solvent utilizing its burning-free, room-temperature solidifying and sublimating properties for 3D printing purposes. The unique combination of the new printing head with pressured air control and the invented ink allows for a mass-production of complex metallic components and parts with a variety of compositions for use in advanced manufacturing in a highly cost-effective way.