A porous copper body including a skeleton having a three-dimensional network structure is provided. An oxidation-reduction layer formed by an oxidation-reduction treatment is provided on a surface of the skeleton, and the average crystal grain size of an entirety including the skeleton and the oxidation-reduction layer is 5% or more of the diameter of the skeleton.

Functionalized metallic feedstock and three-dimensional articles formed therefrom via an additive manufacturing process are provided. The functionalized metallic feedstock includes a plurality of discrete metallic substrates including a first metallic substrate having a first surface area, in which at least a portion of the first surface area comprises a functionalizing agent selected to render the first metallic substrate resistant to corrosion.

A method of fabricating a conductive thin film includes the following steps: forming a polymer fiber made of a polymer and a metal precursor distributed in a surface layer near the surface of the polymer fiber; and applying a plasma treatment on the polymer fiber to concurrently etch the polymer and reduce the metal precursor in the surface layer of the polymer fiber. When the plasma treatment is completed, a metal membrane is formed on the surface of the polymer fiber.

Provided are a method of producing corrosion-protective copper paste through a single process and an application thereof to a dipole tag antenna. Copper powder is surface-etched by using a hydrochloric acid in an inert gas atmosphere, a phosphoric acid aqueous solution is added thereto to form copper phosphate on the etched surface of the copper powder, and then, a vinyl imidazole-silane copolymer and poly(4-styrenesulfonate) were introduced thereto to form a corrosion-protective coating layer on the surface of copper powder on which the copper phosphate has been formed, and a centrifuge and an agate mortar are used to prepare a copper paste having high viscosity and high dispersability. When a copper paste thin film is formed on a flexible film by screen printing, a produced dipole tag antenna may have high efficiency.

The invention relates to thermochemical treatment of metal products, in particular relates to the technology of applying protective anti-corrosion coatings, which may be used for applying zinc-based thermodiffusion coatings (TDC coatings) on parts of different shapes, preferably on steel pipes of oilfield assortment, couplings, as well as fasteners and other products. A method of the invention relates to application of a thermodiffusion zinc-based coating to steel pipes, and comprises the steps of loading the pipes, a saturating mixture containing two-component zinc powder, activator and flux into the container; hermetically closing the container; vacuuming; filling the container cavity with non-oxidizing gas; heating and maintaining the container at a predetermined temperature; subsequent cooling the container and removing the pipes, characterized in that the first component of the two-component zinc powder having needle-shaped particles of 3-8 microns in size is loaded into the internal cavity of the pipes, and a second component of two-component zinc powder having spherical particles of 8-25 microns in size is loaded directly into container, and exposure being carried out at a temperature of 300-425? C., while a flux of one or more tertiary amines is introduced into the saturating mixture in an amount of 0.1-1.0 mas %; a filler containing one or more components selected from the group consisting of silica, wollastonite, carbon black, aluminum oxide and copper alloys, in the following ratio components in mass %: flux 0.1-1.0; filler 25-45; two-component powder zinc-the rest. Also claimed is a steel pipe having a hollow body with thermodiffusion zinc-based coating, characterized in that the coating is obtained using the method described above. The technical result of the invention is achieved by reducing the duration of exposure of the pipes in the temperature range of the thermodiffusion process when obtaining the coatings of a given thickness with improved corrosion resistance durability, uniformity and density of the coating over the entire surface of the pipe, as well as reducing the energy costs and increasing productivity, while ensuring high strength of pipes processed by the present method.

The invention relates to thermochemical treatment of metal products, in particular relates to the technology of applying protective anti-corrosion coatings, which may be used for applying zinc-based thermodiffusion coatings (TDC coatings) on parts of different shapes, preferably on steel pipes of oilfield assortment, couplings, as well as fasteners and other products. A method of the invention relates to application of a thermodiffusion zinc-based coating to steel pipes, and comprises the steps of loading the pipes, a saturating mixture containing two-component zinc powder, activator and flux into the container; hermetically closing the container; vacuuming; filling the container cavity with non-oxidizing gas; heating and maintaining the container at a predetermined temperature; subsequent cooling the container and removing the pipes, characterized in that the first component of the two-component zinc powder having needle-shaped particles of 3-8 microns in size is loaded into the internal cavity of the pipes, and a second component of two-component zinc powder having spherical particles of 8-25 microns in size is loaded directly into container, and exposure being carried out at a temperature of 300-425? C., while a flux of one or more tertiary amines is introduced into the saturating mixture in an amount of 0.1-1.0 mas %; a filler containing one or more components selected from the group consisting of silica, wollastonite, carbon black, aluminum oxide and copper alloys, in the following ratio components in mass %: flux 0.1-1.0; filler 25-45; two-component powder zinc-the rest. Also claimed is a steel pipe having a hollow body with thermodiffusion zinc-based coating, characterized in that the coating is obtained using the method described above. The technical result of the invention is achieved by reducing the duration of exposure of the pipes in the temperature range of the thermodiffusion process when obtaining the coatings of a given thickness with improved corrosion resistance durability, uniformity and density of the coating over the entire surface of the pipe, as well as reducing the energy costs and increasing productivity, while ensuring high strength of pipes processed by the present method.

A variable stiffness engineered degradable ball or seal having a degradable phase and a stiffener material. The variable stiffness engineered degradable ball or seal can optionally be in the form of a degradable diverter ball or sealing element which can be made neutrally buoyant.

A variable stiffness engineered degradable ball or seal having a degradable phase and a stiffener material. The variable stiffness engineered degradable ball or seal can optionally be in the form of a degradable diverter ball or sealing element which can be made neutrally buoyant.

The invention relates to a method of assembling a fiber network comprising a plurality of metal fibers, wherein the method comprises the following steps:

providing a loose network out of the plurality of metal fibers at an assembling site; fixing the plurality of metal fibers to one another by forming contact points between the single metal fibers by heating the plurality of fibers at a heating rate higher than 50 K/min, in particular higher than 100 K/min, especially higher than 200 K/min, preferably higher than 1000 K/min, to a fixation temperature selected in the range of 50 to 98% of their melting point temperature; and cooling the plurality of fibers at a cooling rate higher than 50 K/min, preferably higher than 100 K/min. The invention further relates to a network of metal fibers comprising a plurality of metal fibers fixed one to another at contact points, wherein the metal fibers non-round cross section, in particular a rectangular, quadratic, partial circular or an elliptical cross section with a large axis and a small axis, or wherein the metal fibers comprise a round cross section, and wherein the fibers comprise a width which is generally constant along a length of the fiber such that a variation of the width of the fiber along its length is less than 40%, preferably less than 30%, in particular less than 20%.

The invention relates to a method of assembling a fiber network comprising a plurality of metal fibers, wherein the method comprises the following steps:

providing a loose network out of the plurality of metal fibers at an assembling site; fixing the plurality of metal fibers to one another by forming contact points between the single metal fibers by heating the plurality of fibers at a heating rate higher than 50 K/min, in particular higher than 100 K/min, especially higher than 200 K/min, preferably higher than 1000 K/min, to a fixation temperature selected in the range of 50 to 98% of their melting point temperature; and cooling the plurality of fibers at a cooling rate higher than 50 K/min, preferably higher than 100 K/min. The invention further relates to a network of metal fibers comprising a plurality of metal fibers fixed one to another at contact points, wherein the metal fibers non-round cross section, in particular a rectangular, quadratic, partial circular or an elliptical cross section with a large axis and a small axis, or wherein the metal fibers comprise a round cross section, and wherein the fibers comprise a width which is generally constant along a length of the fiber such that a variation of the width of the fiber along its length is less than 40%, preferably less than 30%, in particular less than 20%.