- Patent Title: Carbon-coated metal powder, conductive paste containing carbon-coated metal powder and multilayer electronic component using same, and method for manufacturing carbon-coated metal powder
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Application No.: US15037943Application Date: 2015-06-17
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Publication No.: US09943909B2Publication Date: 2018-04-17
- Inventor: Yuji Akimoto , Hideki Tanaka , Mineto Iwasaki , Akiko Matsuo
- Applicant: Shoei Chemical Inc.
- Applicant Address: JP Shinjuku-ku, Tokyo
- Assignee: SHOEI CHEMICAL INC.
- Current Assignee: SHOEI CHEMICAL INC.
- Current Assignee Address: JP Shinjuku-ku, Tokyo
- Agency: Flynn, Thiel, Boutell & Tanis, P.C.
- Priority: JP2014-127136 20140620
- International Application: PCT/JP2015/067401 WO 20150617
- International Announcement: WO2015/194579 WO 20151223
- Main IPC: B22F9/14
- IPC: B22F9/14 ; B22F1/02 ; B22F9/12 ; B22F9/04 ; C22C9/00 ; C22C5/06 ; C22C19/00 ; B22F1/00 ; H01G4/008 ; B23K1/00 ; H01F27/28 ; B23K35/02 ; C22C19/03 ; H01G4/012 ; B23K35/30 ; B23K35/36 ; H01F41/04 ; H01G4/30

Abstract:
A carbon-coated metal powder having few impurities, a narrower particle size distribution, and sintering properties is particularly suitable as a conductive powder of a conductive paste for forming internal conductors in a ceramic multilayer electronic component obtained by co-firing multilayered ceramic sheets and internal conductor layers; a conductive paste containing the carbon-coated metal powder; a multilayer electronic component using the conductive paste; and a method for manufacturing the carbon-coated metal powder. The carbon-coated metal powder has specific properties in TMA or ESCA measurements. The carbon-coated metal powder can be obtained by melting and vaporizing a metallic raw material in a reaction vessel, conveying the generated metal vapor into a cooling tube and rapidly cooling the metal vapor by endothermically decomposing a carbon source supplied into the cooling tube, and forming a carbon coating film on metal nuclei surfaces in parallel with generation of the metal nuclei.
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