3results about How to "Uniform diameter" patented technology

The application discloses an in-situ growth MOG carbon nanofiber catalyst and a preparation method and application thereof, and comprises the following steps: stirring and mixing a nanofiber polymer and a solvent to obtain a uniform spinning liquid; performing electrostatic spinning to obtain a nanofiber membrane; adding a metal salt, a nitrogen-containing compound and resorcinol into water, slowly adding formaldehyde into the mixed solution to obtain an in-situ growth solution of a metal organic gel MOG; placing the nanofiber membrane into the in-situ growth solution to adjust a pH value, and performing in-situ growth by heating to obtain a MOG nanofiber membrane material; and performing high-temperature pyrolysis of the MOG nanofiber membrane material and urea in an inert atmosphere to dope nitrogen, thereby obtaining the MOG-CNF catalyst. The catalyst can effectively reduce overpotential of ORR and OER reactions, improve catalytic stability, and present stable and excellent dual-function electrocatalytic performance. Through a nano structure and a synergistic catalytic effect, the catalyst has a wide application prospect in the field of fuel cell energy storage and conversion.

This invention discloses a welding workbench for automotive turbochargers based on standardized processing, belonging to the field of turbocharger welding technology. It includes a base, on which a rotary chuck is slidably mounted. A pneumatic chuck is mounted on the side of the base away from the rotary chuck via a bracket. A first electro-hydraulic rod, connected at one end to the rotary chuck, is mounted on the side of the base away from the pneumatic chuck. Through the design of the base, chuck, auxiliary unit, and positioning unit, the invention precisely solves the technical pain points of traditional workbench use, such as cumbersome processing of extruded plastic metal and unstable clamping. The corresponding arrangement of the rotary chuck and pneumatic chuck achieves precise docking of the turbine shaft and turbine impeller. In conjunction with the second electro-hydraulic rod of the positioning unit, the upper pressure seat, the lower clamping seat, and the transmission engagement of the gear and rack, the turbine impeller, fixed by the pneumatic chuck, can be clamped in a wrap-around manner, effectively preventing radial runout of the impeller during high-speed rotational friction.

This invention discloses a thorium polymer spinning precursor, thorium oxide nanofibers, their preparation methods, and applications, belonging to the field of nuclear materials technology. The invention uses thorium chloride as the thorium source, acetylacetone as the ligand, and triethylamine as the dechlorination agent to prepare a thorium polymer spinning precursor. A spinning solution is prepared using the thorium polymer as the spinning precursor, methanol as the solvent, and polyethylene oxide (PEO) as the spinning aid. The thorium polymer spinning precursor fibers are obtained by electrospinning, and the precursor fibers are then heat-treated to obtain thorium oxide nanofibers. The thorium polymer spinning precursor prepared by this invention has a high thorium content and stable properties. Its spinning solution exhibits good filamentation properties, and the prepared thorium oxide fibers have uniform diameter, dense structure, and excellent flexibility. This thorium oxide nanofiber material can be used as a neutron shielding material, a breeder fuel for nuclear technology, and also as a high-temperature resistant material for preparing special ceramics.