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 for generating hydrodynamic pressure each has at least one interior surface (3421). The at least one interior surface has a sloping surface along a circumferential direction of the hydrodynamic bearing.
Abstract:
A process for manufacturing a porous metal-containing material is provided. For example, a composition is provided comprising particles dispersed in at least one solvent, the particles comprising at least one polymer material and at least one metal-based compound. The solvent can be substantially removed from the composition, and the polymer material can be substantially decomposed, thereby converting the solvent-free particles into a porous metal-containing material. In addition, metal-containing materials produced in accordance with the above process and their use in implantable medical devices can be provided.
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:
In a process of cooling and solidifying molten metal particles, gas substantially free from nascent and molecular oxygen (argon, helium, nitrogen, carbon dioxide and carbon monoxide) is bubbled through a liquid, thereby creating at the surface of the liquid a layer of foam of bubbles containing some of the gas. Additional gas is retained in the space adjacent the foam. Molten metal particles are formed by being centrifugally projected through holes extending through a side wall of a rotating pot disposed within the space. The molten particles are decelerated and cooled by passing into said foam, and rupture some of the bubbles, so that the gas contained within them flows into the space. The particles then leave the foam and pass into the liquid, becoming further cooled, and are thereafter recovered solidified, substantially unoxidized, and with a minimum of distortion, thereby being suitable for forming into strip. New gas-containing bubbles are created by bubbling additional gas through the liquid, so as to maintain the layer of foam.