Patent ID: 6304427
Filing Date: 2001-10-16
Classification: H01G

Abstract:
A valve metal capacitor comprising at least one anodized element having a dielectric layer formed on the element, a conductive layer formed on the dielectric layer, a graphitic carbon layer formed on the conductive layer, a metal-powder-filled paint layer formed on the graphitic carbon layer, and a negative metallic terminal attached to the paint layer; wherein at least one of 1) the graphitic carbon layer is formed from graphitic carbon having at least 73% graphite carbon in a binder stable at temperatures of at least 150.degree. C. or a binder that decomposes into conducting species when exposed to reflow temperatures; 2) the metal-powder-filled paint layer has a resistivity of less than about 0.0005 .OMEGA..multidot.cm and comprises metal powder in a binder stable at temperatures of at least 200.degree. C.; or 3) the negative metallic terminal has a conductivity of at least 90% the conductivity of pure copper, wherein at least the surface of the negative metallic terminal connected to the metal-powder-filled paint layer is plated with a protective coating to prevent oxidation of the negative metallic terminal, and wherein the protective coating is thermally stable at temperatures of at least 200.degree. C.