Patent ID: 9732401
Date: 2017-08-15
CPC Classifications: B22F,B82Y,C22C

Claim:
1. A method for producing metal alloy particles, the metal alloy particles being solid alloy particles comprising at least two metals, wherein in a solid phase region showing a non-solid solution state in equilibrium diagram of the said alloy, the at least two metals form a solid solution, and the two metals show a finely mixed state in the level of nanometers, wherein the finely mixed state in the level of nanometers is the mixed state wherein, in 50% or more of analysis points as a result of analysis of mole ratio of the at least two metals by a transmission electron microscopy energy dispersive x-ray spectroscopy microanalysis of the alloy particles using a beam diameter of 5 nm or by a scanning transmission electron microscopy energy dispersive x-ray spectroscopy microanalysis of the alloy particles using a beam diameter of 0.2 nm, the mole ratios of the two metals are detected within ±30% of the mole ratios of the two metals obtained by inductively coupled plasma atomic emission spectrophotometry analysis results, wherein the method for forming the metal alloy particles comprises: providing a fluid to be processed between at least two processing surfaces, which approach and separate from each other and are movable relative to each other; keeping a distance between the processing surfaces in a minute space of less than 1 mm by a balance between a force in the approaching direction and a force in the separating direction, wherein the forces include a supply pressure of the fluid to be processed and a pressure exerted between the at least two processing surfaces, at least one of which rotates relative to the other; allowing the minute space maintained between the at least two processing surfaces to serve as a flow path of the fluid to be processed, whereby the fluid to be processed forms a thin film fluid of less than 1 mm; using at least two kinds of fluids, comprising a first fluid and a second fluid, as the fluid to be processed, the first fluid containing at least two kinds of metal ions, the second fluid containing at least two kinds of reducing agents; and mixing the fluid to be processed in the thin film fluid, thereby separating the metal alloy particles while controlling the separation time of the at least two kinds of metals to obtain the intended metal alloy particles.