Patent ID: 7713466

Claim:
A method for producing a valve-acting metal sintered body for use as the anode of a solid electrolytic capacitor, which comprises dispersing, coating and shaping a granulated product of a mixture containing a pore-forming agent, an organic binder and particles of a primary powder or secondary aggregated powder of at least one member selected from a group consisting of valve-acting metal, a valve-acting metal compound and a valve-acting metal alloy or a granulated powder thereof, or compressing and shaping the granulated product, sintering the resulting shaped article, and removing the pore-forming agent contained in the resulting sintered body; wherein particles constituting the valve-acting metal compound and valve-acting metal alloy each contains therein at least one compound selected from the group consisting of niobium monoxide, silicon nitride and antimony; wherein the pore-forming agent used for the preparation of the granulated product is a powder particle having an average particle size distribution of 0.1 to 100 μm, the particle size distribution of the pore-forming agent has a plurality of peaks, and wherein out of the plurality of peaks, at least one peak is present in the particle size of 0.1 to 1.0 μm and at least one peak is present in the particle size of 1.0 μm or more.