The present disclosure relates to a fiber-reinforced copper-based brake pad for high-speed railway train, and preparation and friction braking performance thereof. The fiber-reinforced copper-based brake pad for high-speed railway train comprises 80-98.5 wt. % metal powder, 1-15 wt. % non-metal powder and 0.5-5 wt. % fiber component. In addition, some components are added in a specific proportion to achieve optimal performance. The copper-based powder metallurgy brake pad is obtained by powder mixing, cold-pressing and sintering with constant pressure. The friction braking performance of the obtained brake pad is tested according to a braking procedure consisting of three stages, i.e., the first stage with low-pressure and low-speed, the second stage with high-pressure high-speed and the continuous emergency braking third stage with high-pressure and high-speed. The brake pad has advantages including higher and more stable friction coefficient, higher fade and wear resistance and slighter damage to brake disc at high speeds.

The present disclosure relates to a fiber-reinforced copper-based brake pad for high-speed railway train, and preparation and friction braking performance thereof. The fiber-reinforced copper-based brake pad for high-speed railway train comprises 80-98.5 wt. % metal powder, 1-15 wt. % non-metal powder and 0.5-5 wt. % fiber component. In addition, some components are added in a specific proportion to achieve optimal performance. The copper-based powder metallurgy brake pad is obtained by powder mixing, cold-pressing and sintering with constant pressure. The friction braking performance of the obtained brake pad is tested according to a braking procedure consisting of three stages, i.e., the first stage with low-pressure and low-speed, the second stage with high-pressure high-speed and the continuous emergency braking third stage with high-pressure and high-speed. The brake pad has advantages including higher and more stable friction coefficient, higher fade and wear resistance and slighter damage to brake disc at high speeds.

Composite materials include a non-ferrous metal matrix with reinforcing carbon fiber integrated into the matrix. The composite materials have substantially lower density than non-ferrous metal, and are expected to have appreciable strength. Methods for forming composite non-ferrous metal composites includes combining a reinforcing carbon fiber component, such as a woven polymer, with non-ferrous metal nanoparticles and sintering the non-ferrous metal nanoparticles in order to form a non-ferrous metal matrix with reinforcing carbon fiber integrated therein.

A method of making a metallic alloy, more particularly, a high-entropy alloy with a composite structure that exhibits high strength and good ductility, and is used as a component material in electromagnetic, chemical, shipbuilding, machinery, and other applications, and in extreme environments, and the like.

A method of making a metallic alloy, more particularly, a high-entropy alloy with a composite structure that exhibits high strength and good ductility, and is used as a component material in electromagnetic, chemical, shipbuilding, machinery, and other applications, and in extreme environments, and the like.

This invention relates to structures and processing imparting self-healing characteristics in Iron, Copper, Zinc, Magnesium, Nickel, Titanium, Gold, Silver and their alloys, and other materials including polymers and ceramics. The composite disclosed consists of a matrix with dispersed hollow macro, micro and nanotubes or balloons or fibers encapsulating a lower melting point or liquid healing material; self-healing results from flow of liquid healing agent into the crack. Another type of self-healing material is where the cracks are subjected to compressive stresses due to phase transformations in the matrix or reinforcement, including nano structure matrix and nanosize reinforcements. The compressive stresses could be due to shrinkage of shape memory material in the form of fibers, micro and nano size which deform, or reinforcements when expand upon reaction with atmosphere sealing the crack. The invention includes self-healing due to hollow vascular networks through which healing agent can flow and seal the crack.

This invention relates to structures and processing imparting self-healing characteristics in Iron, Copper, Zinc, Magnesium, Nickel, Titanium, Gold, Silver and their alloys, and other materials including polymers and ceramics. The composite disclosed consists of a matrix with dispersed hollow macro, micro and nanotubes or balloons or fibers encapsulating a lower melting point or liquid healing material; self-healing results from flow of liquid healing agent into the crack. Another type of self-healing material is where the cracks are subjected to compressive stresses due to phase transformations in the matrix or reinforcement, including nano structure matrix and nanosize reinforcements. The compressive stresses could be due to shrinkage of shape memory material in the form of fibers, micro and nano size which deform, or reinforcements when expand upon reaction with atmosphere sealing the crack. The invention includes self-healing due to hollow vascular networks through which healing agent can flow and seal the crack.

A method for making a joint structure including embedding a portion of at least two layers of a third component into a first component and interleaving at least one layer of a second component with an unembedded portion of the at least two layers of the third component, wherein the third component inhibits galvanic corrosion between the first and second components, the first component has a first CTE, the second component has a second CTE that is different from the first CTE, the third component has a third CTE that is between the first CTA and the second CTE, and the third component comprises a mesh component.

A method for making a joint structure including embedding a portion of at least two layers of a third component into a first component and interleaving at least one layer of a second component with an unembedded portion of the at least two layers of the third component, wherein the third component inhibits galvanic corrosion between the first and second components, the first component has a first CTE, the second component has a second CTE that is different from the first CTE, the third component has a third CTE that is between the first CTA and the second CTE, and the third component comprises a mesh component.

Disclosed is a carbon nanoparticle-porous skeleton composite material, its composite with lithium metal, and their preparation methods and use. In the carbon nanoparticle-porous skeleton composite material, the porous skeleton is a carbon-based porous microsphere material with a diameter of 1 to 100 m or a porous metal material having internal pores with a micrometer-scale pore size distribution, and the carbon nanoparticles are distributed in the pores and on the surface of the carbon-based porous microsphere material or the porous metal material. The carbon nanoparticle-porous skeleton composite material is mixed with a molten lithium metal to form a lithium-carbon nanoparticle-porous skeleton composite material. The carbon nanoparticles present in the material can better conduct lithium ions during the battery cycle, thereby inhibiting the formation of lithium dendrites, and improving the safety and cycle stability of the battery.