A hard composite composition may comprise a binder and a polymodal blend of matrix powder. The polymodal blend of matrix powder may have at least one first local maxima at a particle size of about 0.5 nm to about 30 m, at least one second local maxima at a particle size of about 200 m to about 10 mm, and at least one local minima between a particle size of about 30 m to about 200 m that has a value that is less than the first local maxima.

The invention is directed to the interventionless activation of wellbore devices using dissolving and/or degrading and/or expanding structural materials. Engineered response materials, such as those that dissolve and/or degrade or expand upon exposure to specific environment, can be used to centralize a device in a wellbore.

Disclosed are: a method capable of preparing, in large-scaled quantity, nonspherical/asymmetric fine particles in which the physical factors (for example, size, shape, structure, etc.) of a fine wire (for example, glass-coated metal wires) are controlled, by merging a convergence of nano technology (NT) and laser machining technology; and a use thereof applicable to various fields including bioassay and security.

Forming dendritic silver particles by combining silver ions, a reducing agent, and a polymer comprising amine groups in an aqueous solution to yield a precursor solution, and irradiating the precursor solution with ultraviolet radiation to form a multiplicity of dendritic silver particles. A desired morphology of the dendritic particles, including branch and junction density, may be achieved by selecting growth parameters, such as molar ratio of amine groups to silver ions, a length of time of irradiating, or both.

A castable, moldable, or extrudable structure using a metallic base metal or base metal alloy. One or more insoluble additives are added to the metallic base metal or base metal alloy so that the grain boundaries of the castable, moldable, or extrudable structure includes a composition and morphology to achieve a specific galvanic corrosion rates partially or throughout the structure or along the grain boundaries of the structure. The insoluble additives can be used to enhance the mechanical properties of the structure, such as ductility and/or tensile strength. The insoluble particles generally have a submicron particle size. The final structure can be enhanced by heat treatment, as well as deformation processing such as extrusion, forging, or rolling, to further improve the strength of the final structure as compared to the non-enhanced structure.

A porous copper sintered material (10) includes: a plurality of copper fibers (11) sintered each other, wherein the copper fibers (11) are made of copper or copper alloy, a diameter R of the copper fibers (11) is in a range of 0.02 mm or more and 1.0 mm or less, and a ratio L/R of a length L of the copper fibers to the diameter R is in a range of 4 or more and 2500 or less (11), redox layers (12) formed by redox treatment are provided on surfaces of copper fibers (11, 11), and concavities and convexities are formed by the redox layer (12), and each of redox layers (12, 12) formed on each of the copper fibers (11) is integrally bonded in a junction of the copper fibers (11).

Disclosed are interfacially modified particulate and polymer composite material for use in injection molding processes, such as metal injection molding and additive process such as 3D printing. The composite material is uniquely adapted for powder metallurgy processes. Improved products are provided under process conditions through surface modified powders that are produced by extrusion, injection molding, additive processes such as 3D printing, Press and Sinter, or rapid prototyping.

This porous copper body includes: a skeleton which is formed of a sintered body of a plurality of copper fibers and has a three-dimensional network structure, wherein the copper fibers forming the skeleton consist of copper or a copper alloy, and the copper fibers have a diameter R in a range of 0.01 mm to 1.0 mm, a ratio L/R of a length L to the diameter R in a range of 4 to 200, and a circularity of a cross section orthogonal to a length direction in a range of 0.2 to 0.9, and the porous copper body has a porosity of 50% to 95%.

The invention is directed to the interventionless activation of wellbore devices using dissolving and/or degrading and/or expanding structural materials. Engineered response materials, such as those that dissolve and/or degrade or expand upon exposure to specific environment, can be used to centralize a device in a wellbore.

The invention is directed to the interventionless activation of wellbore devices using dissolving and/or degrading and/or expanding structural materials. Engineered response materials, such as those that dissolve and/or degrade or expand upon exposure to specific environment, can be used to centralize a device in a wellbore.