A brazing material is interposed between an aluminum-based material and an iron-based material plated with Ni. The brazing material has a structure in which an Al—Si—Ni based alloy layer and an Al layer are bonded via a flux layer. A structure for brazing is formed such that the Al—Si—Ni based alloy layer is located on the aluminum-based material side and the Al layer is located on the iron-based material side. The structure is heated in a furnace and is thereafter cooled, thereby obtaining a brazed joint body in which the Ni plating that is a barrier layer remains and an Al—Ni layer is formed.

An aluminum alloy brazing sheet includes a four-layer material containing an intermediate layer formed of an aluminum alloy including Mn of from 0.2 to less than 0.35 mass %, Si of 0.6 mass % or less, Fe of 0.7 mass % or less, and Cu of 0.1 mass % or less, with the balance being Al and inevitable impurities, a core material formed of an aluminum alloy including Si of 1.2 mass % or less, Fe of 1.0 mass % or less, Cu of from 0.3 to 1.0 mass %, and Mn of from 0.5 to 2.0 mass %, with the balance being Al and inevitable impurities, and each of an air-side brazing material layer and an internal brazing material layer is formed of an aluminum alloy including Si of from 4 to 13 mass %, with the balance being Al and inevitable impurities.

An aluminum alloy brazing sheet used for brazing in an inert gas atmosphere without using a flux includes a brazing material cladded onto at least one side surface of a core material. An oxide is formed on a surface of the aluminum alloy brazing sheet by brazing heating, the oxide including any one or two or more of Mg, Li, and Ca and having a volume change ratio of 0.990 or less to a surface oxide film formed before brazing heating, and an atomic molar ratio of Mg, Li, and Ca to Al in the oxide formed on the surface of the aluminum alloy brazing sheet before brazing heating is 0.50 or less. The present invention provides an aluminum alloy brazing sheet having excellent brazability in brazing in an inert gas atmosphere without using a flux, and a method for manufacturing the same.

The invention relates to a method of manufacturing a brazing sheet product having a core layer of a 3xxx-series aluminium alloy clad on one or both sides with a 4xxx-series aluminium alloy brazing layer, the method comprising the steps of: (i) casting a rolling ingot of the core layer of a 3xxx-series aluminium alloy having the following composition, in wt. %: Mn 0.5-1.8, Si≤1.5, Fe≤0.7, Cu≤1.5, Mg≤1.0, Cr≤0.25, Zr≤0.25, Ti≤0.25, Zn≤0.5, balance impurities and aluminium; (ii) hot rolling of the rolling ingot to a hot rolled sheet having thickness of 2.5-10 mm; (iii) cold rolling of the hot rolled sheet to a gauge of 0.1-4 mm, optionally with an intermediate annealing step during the cold rolling operation; (iv) soft annealing to recrystallize the microstructure of the aluminium sheet, preferably at a temperature in the range of 250° C.-450° C.; (v) further cold rolling of the soft annealed sheet with a cold rolling reduction in the range of 5% to <10% to a final cold rolling thickness; and (vi) recovery annealing at 200° C.-420° C. of the cold rolled aluminium sheet at final cold rolling thickness.

An apparatus, material and method for forming a brazing sheet has a high strength core bonded with corrosion protection layer on the coolant side and/or layers on both airside and coolant side. The material enables heat exchanger components, such as tube, header, plate, etc., for applications, such as automotive heat exchangers, that require high fatigue life as well as high service life in a corrosive environment.

The present invention relates to an aluminum powder coated with a fluorine-based hydrocarbon polymer layer, and a preparation method therefor. According to the present invention, the aluminum powder coated with a fluorine-based hydrocarbon polymer layer and a preparation method therefor enable the preparation of an aluminum powder coated with a fluorine-based hydrocarbon polymer layer, in which an additional oxidation reaction of the aluminum powder is achieved and fuel performance as a solid fuel is improved, by coating the fluorine-based hydrocarbon polymer layer on the surface of the powder.

There is provided an Al bonding wire which can provide a sufficient bonding reliability of bonded parts of the bonding wire under a high temperature state where a semiconductor device using the Al bonding wire is operated. The bonding wire is composed of Al or Al alloy, and is characterized in that an average crystal grain size in a cross-section of a core wire in a direction perpendicular to a wire axis of the bonding wire is 0.01 to 50 μm, and when measuring crystal orientations on the cross-section of the core wire in the direction perpendicular to the wire axis of the bonding wire, a crystal orientation <111> angled at 15 degrees or less to a wire longitudinal direction has a proportion of 30 to 90% among crystal orientations in the wire longitudinal direction.

There is provided a metal-coated Al bonding wire which can provide a sufficient bonding reliability of bonded parts of the bonding wire under a high temperature state where a semiconductor device using the metal-coated Al bonding wire is operated. The bonding wire includes a core wire of Al or Al alloy, and a coating layer of Ag, Au or an alloy containing them formed on the outer periphery of the core wire, and the bonding wire is characterized in that when measuring crystal orientations on a cross-section of the core wire in a direction perpendicular to a wire axis of the bonding wire, a crystal orientation <111> angled at 15 degrees or less to a wire longitudinal direction has a proportion of 30 to 90% among crystal orientations in the wire longitudinal direction. Preferably, the surface roughness of the wire is 2 μm or less in terms of Rz.

An apparatus, material and method for forming a reliably roll-bonded, multi-layer aluminum alloy brazing sheet has a core of 2XXX, 3XXX, 5XXX or 6XXX alloy, a braze liner of 4XXX alloy and an interliner with Mn in the range of 0.2 to 1.0 wt. % and Si in the range of 0.31-1.0 wt. %. Alternatively, Mg in the range of 0.1 to 0.5 wt. % may be present in the interliner. Additional layers such as a second braze liner may be present for providing an inner surface of a heat exchanger. An additional interliner may optionally be used between the core the inner surface layer. The material may be used for highly corrosive environments like an EGR cooler.

A light metal joint filler is provided. The light metal joint filler is formed by uniformly mixing a solvent with a light metal powder and a silver powder, where a powder particle size of the light metal powder is on a micron scale, and a powder particle size of the silver powder is on a nanometer scale or a submicron scale. A metal joining method of the present disclosure includes: coating a joint of two to-be-joined light metal pieces with the light metal joint filler; and hot pressing the two to-be-joined light metal pieces, so that the silver powder is sintered and bonded with the light metal powder and surfaces of the two to-be-joined light metal pieces, and completing joining of the two to-be-joined light metal pieces after the silver powder is condensed.