DOWA METALTECH CO., LTD.

There is provided an aluminum/ceramic bonding substrate having a ceramic substrate, an aluminum plate of an aluminum alloy which is bonded directly to one side of the ceramic substrate, an aluminum base plate of the aluminum alloy which is bonded directly to the other side of the ceramic substrate, and a plate-shaped reinforcing member which has a higher strength than that of the aluminum base plate and which is arranged in the aluminum base plate to be bonded directly to the aluminum base plate, wherein the aluminum alloy contains 0.01 to 0.2% by weight of magnesium, 0.01 to 0.1% by weight of silicon, and the balance being aluminum and unavoidable impurities.

An insulating substrate in which one principal surface of a heat-dissipation-side metal plate is brazed to one principal surface of a ceramic substrate via a brazing material layer provided therebetween, in which a Ni plating layer that covers the brazing material layer exposed between the ceramic substrate and the heat-dissipation-side metal plate is provided, and at least a portion of the other principal surface of the heat-dissipation-side metal plate is not covered with a Ni plating layer, leaving the surface of the heat-dissipation-side metal plate exposed. According to the present invention, it becomes possible to obtain the insulating substrate having excellent furnace passing resistance of the insulating substrate (alone) and further having excellent heat cycle characteristics in a state of a heat sink plate being soldered to the insulating substrate.

There is provided a composite material used in a manufacture of a terminal having a soldering portion and a terminal mating portion, that is a composite material in which a metal coating containing at least one of silver and tin and a composite coating composed of a silver layer containing carbon particles are provided on a base material, wherein there are a portion where the metal coating is exposed and a portion where the composite coating is exposed.

There are provided a silver-plated product which is difficult to allow a silver-plating film to be peeled off from an underlying plating film to have an excellent adhesion in a high-temperature and high-humidity environment when the silver-plating film is formed on a base material via the underlying plating film, and a method for producing the same. After an underlying silver-plating film (preferably having a thickness of 0.06 to 15 μm) is formed on a base material (of preferably copper or a copper alloy) via an underlying plating film (of preferably copper, nickel or an alloy thereof), a surface layer of silver containing carbon and sulfur (a silver-plating film containing carbon and sulfur) (preferably having a thickness of 0.1 to 2.0 μm) is formed on the underlying silver-plating film by electroplating in a silver-plating solution which is an aqueous solution containing silver potassium cyanide or silver cyanide, potassium cyanide or sodium cyanide, and a benzothiazole or a derivative thereof.

A composite material including a composite film formed on a base material, the composite film including a silver layer containing carbon particles, wherein a content of Sb in the composite film is 1 mass % or less, and a crystallite size of silver in the composite film is 40 nm or less.

There is provided a composite material in which a composite coating composed of a silver layer containing carbon particles is provided on a base material, the composite coating having a silver crystallite size of more than 40 nm and not more than 70 nm and having an arithmetic mean roughness Ra (μm) of 2.0 μm or less.

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.

There is provided a composite material in which a composite coating composed of a silver layer containing carbon particles is provided on a base material, wherein when the composite coating is observed with a laser microscope, a proportion of predetermined protrusions in an observation field is 12% or more by area.

A silver-plated product having a higher hardness and more excellent wear resistance than those of conventional silver-plated products, and a method for producing the same. In a method for producing a silver-plated product by forming a surface layer of silver on a base material by electroplating at a current density in a silver-plating solution which is an aqueous solution containing silver potassium cyanide or silver cyanide, potassium cyanide or sodium cyanide, and a benzimidazole (such as 2-mercaptobenzmimidazole or 2-mercaptobenzimidazole sulfonic acid sodium salt dihydrate), the ratios of the concentrations of silver potassium cyanide or silver cyanide, potassium cyanide or sodium cyanide, and the imidazole to the current density during the silver-plating (or the ratios of the concentrations of silver potassium cyanide or silver cyanide and the imidazole to the current density during the silver plating, and the concentration of potassium cyanide or sodium cyanide) are set to be predetermined ranges, respectively.

Provided are a brazing material in paste form containing a powder mixture that contains titanium powder having an average particle diameter (D50) of 20 μm or less in an amount of 0.7 to 2.0 mass %, copper powder in an amount of 3 to 15 mass %, and silver powder as the remaining portion, and a vehicle, and techniques associated with the brazing material.