US 2018/0001388 A9 · 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

Abstract

This invention aims at providing a carbon-coated metal powder having few impurities, a narrower particle size distribution, and sintering properties 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.

Claims24

Dependent claims

A carbon-coated metal powder comprising a metal powder and a carbon coating film that covers the metal powder, wherein

when 10% value, 50% value, and 90% value in a volume-based cumulative fraction in particle size distribution measurements by a laser diffraction method are denoted by D10, D50, and D90, respectively, D50 is 300 nm or less, and an SD value represented by (D90−D10)/(D50) is 1.5 or less;
an oxygen content in a weight proportion of an oxygen component to the carbon-coated metal powder of a unit weight is 1500 ppm or less per specific surface area of 1 m2/g of the powder;
and
X represented by Expression (1) is 50 or less when a TMA measurement is performed by raising a temperature from a room temperature to 1200° C. at a rate of 5° C./min in a nitrogen-hydrogen reducing atmosphere:
X (%)=(X200° C./XMAX)×100 (1)
(in Expression (1), XMAX is a maximum shrinkage percentage and X200° C. is a maximum value in differences, each of which is a difference between a maximum shrinkage percentage and a minimum shrinkage percentage in a temperature width of 200° C.).

3 more elements

A carbon-coated metal powder comprising a nickel-based powder consisting essentially of nickel only or comprising nickel as a main component, and a carbon coating film that covers the nickel-based powder, wherein

an oxygen content in a weight proportion of an oxygen component to the carbon-coated metal powder of a unit weight is 1500 ppm or less per specific surface area of 1 m2/g of the powder;
and
in a surface analysis by ESCA, a peak position attributable to 1s of a carbon atom in a position at 11 nm from a particle surface toward a particle center is shifted to a low-energy side with respect to the peak position in a position at 1 nm from the particle surface toward the particle center.

Dependencies are inferred from the claim text.

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

Life of this patent

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

Life of this patent

Abstract

Claims24