A three-dimensional metallic foam is fabricated with an active oxide material for use as an anode for lithium batteries. The porous metal foam, which can be fabricated by a freeze-casting process, is used as the anode current collector of the lithium battery. The porous metal foam can be heat-treated to form an active oxide material to form on the surface of the metal foam. The oxide material acts as the three-dimensional active material that reacts with lithium ions during charging and discharging.

A composite composition comprising tungsten carbide particles having a barrier coating and a binder is described, which is used as hardfacing materials. The tungsten carbide particles comprise at least one kind of cast tungsten carbide, carburized tungsten carbide, macro-crystalline tungsten carbide and sintered tungsten carbide. The barrier coating comprises at least one of metal carbides, borides, nitrides, carbonitrides, carboborides, nitroborides and carbonitroborides. The binder alloys take one of the forms selected from a welding/brazing tube, rod, rope, powder, paste, slurry and cloth, which are suitable for being applied by various welding or brazing methods. The barrier coating would prevent or mitigate the degradation of the tungsten carbide particles due to attack of a molten binder alloy during a welding or brazing process.

In an aspect, multiple metallic base materials are mixed into a user-controlled multimetallic mixture and extruded into a net shape, which is thermally processed into a multimetallic and/or alloyed object. In another aspect, a superstructure is fabricated around an object, but physically isolated from the object, with a shape facilitating robotic handling of the superstructure, along with removal of powder from the object, after a three-dimensional printing process. In another aspect, a ceramic precursor is used to create a separable interface between a support structure and a sinterable object. More specifically, a sinterable structure is fabricated from a sinterable powder in an aqueous binder, and an interface layer is formed by depositing a ceramic precursor in a nonaqueous solution onto the sinterable structure. When the ceramic precursor is exposed to water in the aqueous binder, the ceramic can precipitate to form an unsinterable, ceramic interface layer between sinterable structures.

A preparation method of high purity and densified tungsten-titanium metal which mixes titanium metal powder and tungsten metal powder together; adds metallic nitrates (such as nickel nitrate) as combustion improvers; then taking into the account of the characteristics of metal nitrate, which is soluble in alcohols to form a liquidous precursor, adds metal powder to mix together thoroughly, so that the sintering agent is expected to be colloid and uniformly spread among the tungsten-titanium metal powder. The preparation method significantly reduces the ratio of the combustion improver during the preparation of the high purity and densified tungsten-titanium target material.

Provided is a seal (19) for sealing against powder between a cylinder (14) of a build tank (5) and a build table (9) arranged in the cylinder of an additive manufacturing apparatus (1) for forming a three-dimensional article layer by layer from a powder. The seal (19) has an endless ring portion (21) for extending along a circumference of an inner surface (20) of the cylinder (14) and abutting against the inner surface (20).

Methods for manufacturing components that include casting a first melt to produce an ingot, remelting the ingot to form a second melt, forming a powder from the second melt using an atomization process, and fabricating a component utilizing the powder in an additive manufacturing process. The ingot and the powder include an aluminum matrix that contains dispersions of TiB.sub.2 particles and Al.sub.3Ti particles and the component is a metal matrix composite having an aluminum matrix that contains dispersions of TiB.sub.2 particles and Al.sub.3Ti particles. Optionally, the metal matrix composite may include particles of an intermetallic compound of aluminum and at least one alloying element.

One exemplary embodiment of this disclosure relates to a gas turbine engine, including a component having a first portion formed using one of a casting and a forging process, and a second portion formed using an additive manufacturing process.

A dynamic compaction process comprises forming first and second preforms. Forming each preform includes utilizing a container having an interior and an exterior. Filling the interior of the container with a powder material; sealing the container; subjecting the exterior of the container to an instantaneous dynamic compaction, forming a solid powder metallurgy preform encased by the container. The container gets removed from each preform. The process includes inserting the first and second preforms in another container in a predefined pattern; the predefined pattern aligns the first and second preforms creating an interface. The process includes inserting a backstop against the predefined pattern in this container; subjecting the exterior of this container to an instantaneous dynamic compaction. The process includes bonding the first preform and second preform along the interface to form a component precursor; and removing the container from the precursor. Another step includes processing the precursor into components.

An electrode, a preparation method therefor, and uses thereof. Titanium or titanium alloy is used as a base material of the electrode, the outer surface of the base material is coated with a composite material coating, and the composite material coating is prepared by coating a composite material solution and carrying out drying and sintering. The composite material solution is a nanoscale solution formed by dissolving transition metal elements in ethanol. The nanoscale solution is an ethanol solution of the nanoscale transition metal with particles of the transition metal as solutes thereof. The transition metal elements are platinum, iridium, ruthenium, gold, cerium, rhodium, tantalum, manganese, nickel, palladium, yttrium, gadolinium, cobalt, europium, lanthanum, neodymium, zirconium and titanium, and the molar ratio of the transition metal elements platinum, iridium, ruthenium, gold, cerium, rhodium, tantalum, manganese, nickel, palladium, yttrium, gadolinium, cobalt, europium, lanthanum, neodymium, zirconium and titanium in the composite material solution is 5-15:23-34:14-21:1-7:9-17:3-12:15-27: 3-6:2-9:10-23:15-27:2-8:15-30:3-12:4-14:1-10:6-15:20-50.

The present specification relates to a metal nanoparticle. Specifically, the present specification relates to a metal nanoparticle having a cavity.