Disclosed is a surface-treated copper foil, which exhibits excellent weldability when copper foils or a copper foil and an other metal are welded with each other by ultrasonic welding. Specifically disclosed is a surface-treated copper foil which is charac...

A producing method of a porous SiNhaving high porosity and formed of SiNparticles having a high aspect ratio includes the following steps. A compound of a rare earth element as a first sintering agent is mixed in an amount of 7.5-45 parts by mass, in terms...

A workpiece (11), in which a lead is laid on top of a three-dimensional porous metal body, is placed between an ultrasonic horn (2) and an anvil (3) with a lead portion facing the ultrasonic horn (2). A support (7) is raised so that the lead portion of the...