Abstract:
This invention relates to powder metallurgy, more specifically, to methods of fabricating hard alloy items. The invention can be used as an iron, cobalt or nickel base binder for the fabrication of diamond cutting tools for the construction industry and stone cutting, including segmented cutting discs of different designs and wires for reinforced concrete and asphalt cutting used in the renovation of highway pavements, runways in airports, upgrading of metallurgical plants, nuclear power plants, bridges and other structures, monolithic reinforced concrete cutting drills, as well as discs and wires for the quarry production of natural stone and large scale manufacturing of facing construction materials. This invention achieves the objective of providing binders for the fabrication of diamond tools having higher wear resistance without a significant increase in the sintering temperature, as well as higher hardness, strength and impact toughness. The achievement of these objectives by adding an iron group metal as the main component of the binder composition and alloying additives in the form of nanosized powder in accordance with this invention is illustrated with several examples of different type binders for the fabrication of diamond tools.
Abstract:
A method for fabricating a magnesium-based composite material, the method includes the steps of: (a) providing a large amount of magnesium-based powder and a large amount of nanoscale reinforcements; (b) uniformly mixing the magnesium-based powder and the nanoscale reinforcements to form a mixture; and (c) compacting the mixture at a high velocity in a protective gas to achieve the magnesium-based composite material. High velocity compaction equipment for fabricating the magnesium-based composite material includes a sealing chamber, a gas pumping device, a mold, and a hammer. The gas pumping device is connected to the sealing chamber. The mold is disposed in the sealing chamber with an aperture formed on the top thereof. The hammer is disposed in the sealing chamber and above the mold, and moving along longitudinal thereof at a controllable ramming speed.
Abstract:
A medical device that is at least partially formed of a novel metal alloy, which novel metal alloy improves the physical properties of the medical device.
Abstract:
Provided is a high-strength and high-toughness magnesium alloy which has practical level of both the strength and the toughness for expanded applications of the magnesium alloys, and is a method for manufacturing thereof. The high-strength and high-toughness magnesium alloy of the present invention contains: a atom % in total of at least one metal of Cu, Ni, and Co; and b atom % in total of at least one element selected from the group consisting of Y, Dy, Er, Ho, Gd, Tb, and Tm, while a and b satisfying the following formulae (1) to (3), 0.2≦a≦10 (1) 0.2≦b≦10 (2) 2/3a−2/3
Abstract:
The object of the present invention is provide a metal nanoparticle which has a nano-sized average diameter while being highly stable as a particle, and a method for producing such metal nanoparticle. Particularly provides a metal nanoparticle having characteristics such as particle diameter and particle size distribution suitable for forming a conductive coating layer, and a method for producing such metal nanoparticle. The metal nanoparticle of the present invention is characterized in that it is obtained by reacting a reducing agent act on a solution containing an organic acid metal salt and an amine.
Abstract:
Hardmetal compositions each including hard particles having a first material and a binder matrix having a second, different material comprising rhenium or a Ni-based superalloy. A two-step sintering process may be used to fabricate such hardmetals at relatively low sintering temperatures in the solid-state phase to produce substantially fully-densified hardmetals.
Abstract:
A composition for forming a compact includes a powder mainly composed of an inorganic material, a first resin being decomposable by an action of an alkaline gas, and a binder including the first resin. The first resin is decomposed and removed from the compact formed by molding the composition for forming a compact by exposing the compact to a first atmosphere containing an alkaline gas so as to obtain a degreased body.
Abstract:
A method of producing a refractory metal powder that includes providing a metal powder containing magnesium tantalate or magnesium niobate; and heating the powder in an inert atmosphere in the presence of magnesium, calcium and/or aluminum to a temperature sufficient to remove magnesium tantalate or magnesium niobate from the powder and/or heating the powder under vacuum to a temperature sufficient to remove magnesium tantalate or magnesium niobate from the powder, the heating steps being performed in any order. The metal powder can be formed into pellets at an appropriate sintering temperature, which can be formed into electrolytic capacitors.
Abstract:
A direct manufacturing technique involving rapid solidification processing uses a reaction between a metallic molten pool and a reactant gas in an inert atmosphere to form alloys with improved desired properties. By utilizing rapid solidification techniques, solubility levels are increased resulting in alloys with unique mechanical and physical properties. Laser deposition of alloys in atmospheres of varying reactant content produce compositions with intermingled and significantly improved overall properties.
Abstract:
A method of fabricating a medical implant component. The method may include the steps of producing a substrate from a first material wherein the substrate has a bearing portion, spraying particles of a second material onto the bearing portion in accordance with a predetermined spraying technique to provide a coating thereon, and subjecting the coated bearing portion to a hot isostatic pressing process, a vacuum sintering process, or a controlled atmospheric sintering process. The first material may be the same as or different from the second material. The predetermined spraying technique may be a thermal type spraying process such as a plasma spraying process or a high velocity oxygen fuel spraying process.