Abstract:
A hydrodynamic bearing (300) has a bearing surface adapted for receiving a shaft to rotate thereon. The bearing surface has a plurality of grooves (34) defined therein. The grooves are used for generating hydrodynamic pressure. A depth of each of the grooves is changed in a sloping trend along the extension direction of the groove.
Abstract:
A method for manufacturing a hydrodynamic bearing (30) comprises the steps of: step (201): providing a substrate (10) with a plurality of protrusions (14) formed on a periphery thereof; step (202): placing the substrate in a middle of a hollow mold, then pushing a feedstock of powder and molten binder into the mold to surround the substrate under pressure, whereby a desired bearing preform (20) is formed; step (203): separating the substrate (10) from the bearing preform by means of debinding; step (204): sintering the bearing preform; step (205): precision machining the bearing preform to form the desired hydrodynamic bearing.
Abstract:
A nickel powder with a mean particle size of 0.05 to 1.0 μm, the nickel powder comprising a thin oxidized layer of nickel on a surface thereof and having an oxygen content of 0.3 to 3.0 wt. % and a carbon content of 100 ppm or less per specific surface area of 1 m2/g of the powder, in a weight proportion of carbon to the nickel powder of unit weight. When the powder is used for a conductive paste for forming inner electrode layers of a multilayer electronic component, it enables the decrease in the residual carbon amount after a binder removal process, thereby making it possible to obtain a multilayer ceramic electronic component with excellent electric characteristics and high reliability in which electrode layers excelling in continuity are formed without decreasing the strength and electric characteristics of the electronic component or creating structural defects.
Abstract:
Described is a method for producing high purity tantalum, the high purity tantalum so produced and sputtering targets of high purity tantalum. The method involves purifying starting materials followed by subsequent refining into high purity tantalum.
Abstract:
Porous metal-containing materials are provided for a variety of uses including filters, electrodes for batteries and fuel cells, light weight structural materials, heat exchangers and catalysts. A method is provided for making the porous metal-containing materials involving vapor phase sintering of a metal oxide green form followed by reduction to form a porous metal-containing material, typically without any significant shrinkage of the sample occurring during processing. The porous metal-containing materials may have porosities of from about 40 percent to as high as 90% in some embodiments. Furthermore, the pore volume is highly interconnected, which is particularly advantageous for many applications.
Abstract:
Chlorine gas from a supply nozzle is mixed with the vapor of nickel chloride and the mixed gas is supplied from a supply nozzle into a hydrogen gas atmosphere in a reduction reactor at a reduction temperature of 900 to 1100° C. The volume of chlorine gas to be mixed versus the vapor of nickel chloride is adjusted to a ratio of 0.01 to 0.5 moles per mole of the vapor of nickel chloride. The particle size of the nickel powder can be controlled appropriately, and also, uniformity of particle size, smoothability of surfaces of particles, and sphericity can be improved.
Abstract:
The present disclosure provides three-dimensional (3D) printing systems, apparatuses, software, and methods for the production of at least one requested 3D object. The 3D printer includes a material conveyance system, filtering system, and unpacking station. The material conveyance system may transport pre-transformed material against gravity. The 3D printing described herein comprises facilitating non-interrupted material dispensing through a component of the 3D printer, such as a layer dispenser.
Abstract:
A method for material processing is disclosed, the method comprising applying a laser beam, directing the laser beam to a processing location to melt material at the processing location, and providing a shielding gas flow. The shielding gas flow is controlled dependent on at least one of a processing location position, a processing advance vector, and a processing trajectory.
Abstract:
A method includes additively manufacturing an article in an inert environment, removing the article from the inert environment and placing the article in a non-inert environment, allowing at least a portion the article to oxidize in the non-inert environment to form an oxidized layer on a surface of the article, and removing the oxidized layer (e.g., to smooth the surface of the article). The method can further include relieving stress in the article (e.g., via heating the article after additive manufacturing).