TUNGSTEN POWDER, POSITIVE ELECTRODE BODY FOR CAPACITORS, AND ELECTROLYTIC CAPACITOR

The present invention relates to a tungsten powder having tungsten silicide such as W 5 Si 3 on the surface of the particles and having the silicon content of 0.05 to 7 mass%; an anode body for capacitors; an electrolytic capacitor; a method for producing the tungsten powder; and a method for producing the anode body for capacitors. The tungsten powder has an average primary particle diameter of 0.1 to 1 µm, wherein tungsten silicide is localized within 50 nm from the particle surface. The tungsten powder contains at least one member selected from tungsten nitride, tungsten carbide and tungsten boride on a part of the particle surface. It is preferable for the tungsten powder that the content of the phosphorous element is 1 to 500 mass ppm; the oxygen content is 0.05 to 8 mass%; and the content of the elements other than tungsten, silicon, nitrogen, carbon, boron, phosphorous and oxygen is 0.1 mass% or less. It is also preferable that the tungsten granulated powder has an average particle diameter of 50 to 200 µm and a specific surface area of 0.2 to 20 m 2 /g. The present invention can provide a tungsten capacitor which has good leakage current (LC) characteristics.