Niobium powder, niobium granulated powder, niobium sintered body, capacitor and production method thererof

Abstract

The present invention provides a method of efficiently producing niobium powder, niobium alloy powder, niobium hydride powder or niobium hydride alloy powder for a capacitor, which enables production of capacitor having a high capacitance per unit mass and good leakage current characteristics with narrow variation, and also provides a production method for sintered body and a capacitor using the niobium powder, niobium alloy powder, niobium hydride powder or niobium hydride alloy powder. According to the present invention, by grinding niobium hydride powder or niobium hydride alloy powder with a grinding aid having a density of 2 to 3.6 g/cm3 and a fracture toughness value of 1.5 MPa·m1/2 or more, such as beads made of silicon nitride or a compound containing silicon nitride, a niobium powder with high capacitance can be efficiently produced.

Dependencies are inferred from the claim text.