The disclosure relates to a Cu-based microcrystal alloy and a preparation method thereof. Through being measured in percentage by mass, the Cu-based microcrystal alloy provided by the disclosure includes 20 to 30 percent of Mn, 0.01 to 10 percent of Al, 5 to 10 percent of Ni, 0.3 to 1.5 percent of Ti, 0 to 1.5 percent of Zr, 0.05 to 2 percent of Si and 45 to 74.64 percent of Cu.

The present invention relates to an alloy which has the following composition:
Cu.sub.47at %−(x+y+z)(Ti.sub.aZr.sub.b).sub.cNi.sub.7at %+xSn.sub.1at %+ySi.sub.z
where c=43-47 at %, a=0.65-0.85, b=0.15-0.35, where a+b=1.00; x=0-7 at %; y=0-3 at %, z=0-3 at %, where y+z≤4 at %.

Disclosed herein, in certain embodiments, are composite materials, methods, tools and abrasive materials comprising a tungsten-based metal composition and an alloy. In some cases, the composite materials or material are resistant to oxidation.

Disclosed herein, in certain embodiments, are composite materials, methods, tools and abrasive materials comprising a tungsten-based metal composition and an alloy. In some cases, the composite materials or material are resistant to oxidation.

Turbomachines, as well as their components, are disclosed being in the field of production and treatment of oil and gas containing e.g. hydrocarbon plus hydrogen sulfide, carbon dioxide, with or without other contaminants. The components are made of a high corrosion high temperature resistant alloy, capable of resisting to corrosion and/or stress at high temperature better than state of art martensitic stainless steels and behaving similarly to premium nickel base superalloys, and at the same time showing a very improved hardness value.

Turbomachines, as well as their components, are disclosed being in the field of production and treatment of oil and gas containing e.g. hydrocarbon plus hydrogen sulfide, carbon dioxide, with or without other contaminants. The components are made of a high corrosion high temperature resistant alloy, capable of resisting to corrosion and/or stress at high temperature better than state of art martensitic stainless steels and behaving similarly to premium nickel base superalloys, and at the same time showing a very improved hardness value.

The present invention is an atomization device for manufacturing metal powder by spraying a fluid to molten metal, said device comprising: a tundish into which the molten metal is poured and discharged from a discharge nozzle installed on a bottom part; fluid spray nozzles disposed below the tundish and spraying the fluid to the molten metal dropping from the tundish; a means for measuring a molten-metal surface height inside the tundish from an image obtained by imaging the inside of the tundish; and a means for, upon calculating an amount of the molten metal to be poured into the tundish from the molten-metal surface height, discharging the molten metal in such a manner that the height is maintained substantially constant. The interior of the tundish is formed in such a shape that the area of the molten-metal surface of the poured molten metal increases with height in the vertical direction.

Provided are a thermoelectric material having excellent thermoelectric characteristics at room temperature; a method for producing same; and a thermoelectric power generation element. In an embodiment of the present invention, the thermoelectric material contains an inorganic compound containing magnesium (Mg), silver (Ag), antimony (Sb) and copper (Cu), and is represented by the formula Mg.sub.1−aCu.sub.aAg.sub.bSb.sub.c, and the parameters a, b and c satisfy: 0<a≤0.1, 0.95≤b≤1.05 and 0.95≤c≤1.05. The inorganic compound may be an a phase of a half-Heusler structure and have the symmetry of the space group I-4c2.

Provided are a thermoelectric material having excellent thermoelectric characteristics at room temperature; a method for producing same; and a thermoelectric power generation element. In an embodiment of the present invention, the thermoelectric material contains an inorganic compound containing magnesium (Mg), silver (Ag), antimony (Sb) and copper (Cu), and is represented by the formula Mg.sub.1−aCu.sub.aAg.sub.bSb.sub.c, and the parameters a, b and c satisfy: 0<a≤0.1, 0.95≤b≤1.05 and 0.95≤c≤1.05. The inorganic compound may be an a phase of a half-Heusler structure and have the symmetry of the space group I-4c2.

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.