Taiyo Nippon Sanso Corporation

Bandai Namco Entertainment Inc.

Hiroshi Igarashi

Shinichi Miyake

Takayuki Fujimoto

Takayuki Matsumura

Yuji Sakuramoto

Tadashi Yamashita

Kenichi Hara

Hirotaka Kawakami

Yosuke Kuroda

Ryo Naito

A method for producing fine copper particles includes producing fine copper particles having a coating film containing cuprous oxide on a surface by heating copper or a copper compound in a reducing flame formed by a burner. The fine copper particles are produced by adjusting a mixing ratio between a combustible gas and a combustion supporting gas which form the reducing flame such that a volume ratio of CO/COis in a range of 1.5 to 2.4.

Fine copper particles, method for producing fine copper particles and method for producing sintered body

An object of the present invention to provide copper fine particles which can be sintered at a lower temperature than that of the conventional copper fine particles without causing a cost increase, a decrease in productivity, a method for producing the copper fine particles, and a sintered body, and the present invention provides copper fine particles having a coating film containing cuprous oxide and copper carbonate on the surface thereof.

Copper fine particle, method for producing same, and sintered body

A method of producing ultra-fine metal particles of the present invention includes: blowing metal powders of raw materials into reducing flame formed by a burnerin a furnace, wherein the metal powders are melted in the flame and allowed to be in an evaporated state, to thereby obtain the spherical ultra-fine metal particles. In the present invention, the atmosphere in the furnaceis preferably prepared such that the CO/COratio is within a range from 0.15 to 1.2. Also, a spiral flow-forming gas is preferably blown into the furnace, and the oxygen ratio of the burneris preferably within a range from 0.4 to 0.8. As raw materials, a metal oxide and/or a metal hydroxide which contain the same metal as the metal powders may be used together with the metal powders.

Method of producing ultra-fine metal particles

A process for producing metallic ultra-fine powder, which can use a raw material which is spread over a wide range, and control freely the grain size of the metallic powder to be produced, at low cost and high safety. The process for producing the metallic ultra fine powder consists of using a burner and a furnace which can generate a high temperature reductive atmosphere, and an apparatus for separating gas which is generated in the furnace from powder to recover the powder. The burner has a function of blowing a powdery metallic compound as a raw material into a high temperature reductive flame. The raw material powder is efficiently heated in airflow of a high temperature reductive flame, thereby being reduced rapidly into metallic ultra-fine powder. At this time, the grain size of the metallic ultra-fine powder is controlled by adjusting the oxygen ratio (i.e. the ratio of amount of the burning-assist gas supplied to the burner to the amount of the burning-assist gas required for completely burning the fuel).

Process for producing metallic ultrafine powder

Growing community of inventors

Kai, Japan

Hiroshi Igarashi