Submerged combustion burners having a burner body and a burner tip connected thereto. The burner body has an external conduit and first and second internal conduits substantially concentric therewith, forming first and second annuli for passing a cooling fluid therethrough. A burner tip body is connected to the burner body at ends of the external and second internal conduits. The burner tip includes a generally central flow passage for a combustible mixture, the flow passage defined by an inner wall of the burner tip. The burner tip further has an outer wall and a crown connecting the inner and outer walls. The inner and outer walls, and the crown are comprised of same or different materials having greater corrosion and/or fatigue resistance than at least the external burner conduit.

A soft magnetic metal powder or the like from which a soft magnetic metal fired body can be provided has a high magnetic permeability μ and a specific resistance ρ and is contained in a coil-type electronic component having sufficiently high inductance L and Q value and unlikely to be plating-extended and short-circuited. A soft magnetic metal powder contains soft magnetic metal particles containing at least Fe and Ni. Said soft magnetic metal powder further contains P, Si, Cr and/or M. M is at least one selected from among B, Co, Mn, Ti, Zr, Hf, Nb, Ta, Mo, Mg, Ca, Sr, Ba, Zn, Al, and rare earth elements. The content of each element is within a predetermined range.

A Ni-plated steel sheet according to one aspect of the present invention includes a base steel sheet; and a Ni plating layer provided on a surface of the base steel sheet, wherein the Ni plating layer includes a Ni—Fe alloy layer formed on the surface of the base steel sheet, and a ratio of a Sn content to a Ni content in the Ni plating layer is 0.0005% to 0.10%.

A Ni-plated steel sheet according to one aspect of the present invention includes a base steel sheet; and a Ni plating layer provided on a surface of the base steel sheet, wherein the Ni plating layer includes a Ni—Fe alloy layer formed on the surface of the base steel sheet, and a ratio of a Sn content to a Ni content in the Ni plating layer is 0.0005% to 0.10%.

Provided is a brazing filler material for bonding iron-based sintered member that includes a sintered compact containing Cu, Mn, and a remainder of Ni and unavoidable impurities, and an oxide film formed on a surface of the sintered compact. An oxygen concentration may account for not less than 0.1% by mass of a total amount of the brazing filler material. The oxide film may contain Mn.

Provided is a brazing filler material for bonding iron-based sintered member that includes a sintered compact containing Cu, Mn, and a remainder of Ni and unavoidable impurities, and an oxide film formed on a surface of the sintered compact. An oxygen concentration may account for not less than 0.1% by mass of a total amount of the brazing filler material. The oxide film may contain Mn.

A Ni-plated steel sheet according to one aspect of the present invention includes a base steel sheet and a Ni plating layer provided on a surface of the base steel sheet, the Ni plating layer has a Ni—Fe alloy layer formed on a surface of the base steel sheet, and a ratio of a Zn content to a Ni content in the Ni plating layer is 0.0005% to 0.10%. A manufacturing method of the Ni-plated steel sheet according to one aspect of the present invention has electroplating a base steel sheet using a Ni plating bath in which [Zn.sup.2+]/[Ni.sup.2+] is set to 0.0005% to 0.10% to obtain a material Ni-plated steel sheet, and annealing the material Ni-plated steel sheet.

A Ni-plated steel sheet according to one aspect of the present invention includes a base steel sheet and a Ni plating layer provided on a surface of the base steel sheet, the Ni plating layer has a Ni—Fe alloy layer formed on a surface of the base steel sheet, and a ratio of a Zn content to a Ni content in the Ni plating layer is 0.0005% to 0.10%. A manufacturing method of the Ni-plated steel sheet according to one aspect of the present invention has electroplating a base steel sheet using a Ni plating bath in which [Zn.sup.2+]/[Ni.sup.2+] is set to 0.0005% to 0.10% to obtain a material Ni-plated steel sheet, and annealing the material Ni-plated steel sheet.

A porous body comprises a framework having a three-dimensional network structure, the framework having a body including nickel and cobalt as constituent elements, the body of the framework including the cobalt at a proportion in mass of 0.2 or more and 0.8 or less relative to a total mass of the nickel and the cobalt, the framework having a surface with an arithmetic mean roughness of 0.05 μm or more, the porous body being increased in volume by 1% or more for a shape of an external appearance thereof after the porous body undergoes a heat treatment in the atmosphere at 800° C. for 200 hours with a load of 16 kPa applied.

The eddy current deceleration device according to the present disclosure includes: a stator including a cylindrical body and a plurality of magnets disposed on an outer circumferential surface of the cylindrical body; and a rotor including a cylindrical part that houses the cylindrical body, wherein the cylindrical part of the rotor includes, on an inner circumferential surface of the cylindrical part, in order closest to the inner circumferential surface: a first layer consisting of one of an Ni—P alloy that is an Ni alloy consisting of P with the balance being Ni and impurities and an Ni—B alloy that is an Ni alloy consisting of B with the balance being Ni and impurities; a second layer consisting of nickel; a third layer consisting of one of copper and copper alloy; a fourth layer consisting of nickel alloy; and a fifth layer consisting of nickel.