A metal-graphene composite product in the form of a sliding contact of an electric power application, in which graphene flakes are dispersed in a matrix of the metal, as well as to a method for obtaining such a composite product.

A rivet-type contact of the present invention has a head part made of a contact material, and a leg part narrower than the head part in width and configured to be deformed at fixation. The leg part includes a flange part larger than the leg part in diameter, in an end part of the side of the head part, the flange part is embedded in the head part such that a lower end surface of the flange part and a lower end surface of the head part become approximately flat, and a length (l) between an endmost part of the flange part and a starting point of the leg part satisfies l<L with respect to a length (L) between an endmost part of the head part and the starting point of the leg part. Specifically, it is favorable that l satisfies 0.5Ll0.9 L with respect to L.

A rivet-type contact of the present invention has a head part made of a contact material, and a leg part narrower than the head part in width and configured to be deformed at fixation. The leg part includes a flange part larger than the leg part in diameter, in an end part of the side of the head part, the flange part is embedded in the head part such that a lower end surface of the flange part and a lower end surface of the head part become approximately flat, and a length (l) between an endmost part of the flange part and a starting point of the leg part satisfies l<L with respect to a length (L) between an endmost part of the head part and the starting point of the leg part. Specifically, it is favorable that l satisfies 0.5Ll0.9 L with respect to L.

There is provided an Ag-plated material and a related technique, including: an Ag-plated layer on a substrate that comprises a conductive metal; and a plurality of two-layer plating structures on the substrate, the two-layer plating structures having a porous Ni-plated layer and an Ag-plated layer in this order from a substrate side.

A screw includes a barrel-shaped central pin is surrounded by a cylindrical bore having a conical bottom The cylindrical insert is seated in the cylindrical bore. The top surface of the central pin is lowered below the top surface of the head. The walls of the pin (4) are convex towards the insert. Manufacturing the screw includes producing the threaded part with the head with the cylindrical recess with the cone-shaped bottom. The cylindrical insert terminates at one end with a bevel with an inclination angle of =10-30. The insert is introduced into the cylindrical recess. The upper part of the insert protruding from head of the screw is pre-shaped. The pin is upset using an appropriate tool and simultaneously the top surface of the pin is lowered below the top surface of the head.

A screw includes a barrel-shaped central pin is surrounded by a cylindrical bore having a conical bottom The cylindrical insert is seated in the cylindrical bore. The top surface of the central pin is lowered below the top surface of the head. The walls of the pin (4) are convex towards the insert. Manufacturing the screw includes producing the threaded part with the head with the cylindrical recess with the cone-shaped bottom. The cylindrical insert terminates at one end with a bevel with an inclination angle of =10-30. The insert is introduced into the cylindrical recess. The upper part of the insert protruding from head of the screw is pre-shaped. The pin is upset using an appropriate tool and simultaneously the top surface of the pin is lowered below the top surface of the head.

A contact assembly for an electrical device and a method for making such an assembly are presented. The contact assembly comprises a substrate and a contact material disposed on the substrate. The contact material comprises a composite material comprising a refractory material and a matrix material. The matrix material has a higher ductility than the refractory material. The composite material further comprises a core region and an outer region bounding the core region, the core region having a higher concentration of the refractory material than the outer region. The method applies cold spraying a blended feedstock to produce a layer that includes the composite material described above..

A contact assembly for an electrical device and a method for making such an assembly are presented. The contact assembly comprises a substrate and a contact material disposed on the substrate. The contact material comprises a composite material comprising a refractory material and a matrix material. The matrix material has a higher ductility than the refractory material. The composite material further comprises a core region and an outer region bounding the core region, the core region having a higher concentration of the refractory material than the outer region. The method applies cold spraying a blended feedstock to produce a layer that includes the composite material described above..

A method for using a bismuth based alloy as switch or socket power-off element which is applied to a switch or a socket, and the switch or the socket includes two conductive elements for conducting currents and one power-off element. A bismuth based alloy is used as the power-off element and a melting point of the bismuth based alloy is between 100 C. to 380 C. When the power-off element is in an environment below the melting point, the two conductive elements are mutually contacted and capable of conducting currents, whereas the power-off element is only receptive of the currents but does not serve as a medium for conducting the currents; when a working temperature of the switch or the socket is close to or exceeds the melting point, the power-off element loses rigidity and enables the two conductive elements to be separated from each other, thereby forming an electrically disconnected state.

A method for using a bismuth based alloy as switch or socket power-off element which is applied to a switch or a socket, and the switch or the socket includes two conductive elements for conducting currents and one power-off element. A bismuth based alloy is used as the power-off element and a melting point of the bismuth based alloy is between 100 C. to 380 C. When the power-off element is in an environment below the melting point, the two conductive elements are mutually contacted and capable of conducting currents, whereas the power-off element is only receptive of the currents but does not serve as a medium for conducting the currents; when a working temperature of the switch or the socket is close to or exceeds the melting point, the power-off element loses rigidity and enables the two conductive elements to be separated from each other, thereby forming an electrically disconnected state.