Electrode materials for electric lamps and methods of manufacture thereof

US6849996B2 · kind B2 · utility

Assignee

• General Electric Company · US

Inventors

• Shankar Venugopal · Bengaluru, IN
• Alok Mani Srivastava · San Francisco, US
• Holly Ann Comanzo · Niskayuna, US
• Vikas Midha · Clifton Park, US
• William Winder Beers · Chesterland, US
• Gopi Chandran Ramachandran · Savanuru, IN
• Mukunda Adyam · Savanuru, IN

Key dates

• Filing date: May 30, 2003
• Grant date: Feb 1, 2005
• Expiry date: Jun 20, 2023

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01J61/0737
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

An electron emissive composition comprises a barium tantalate composition of the formula (Ba1−x, Cax, Srp, Dq)6(Ta1−y, Wy, Et, Fu, Gv, Caw)2O(11±δ) where δ is an amount of about 0 to about −3; and wherein D is either an alkali earth metal ion or an alkaline earth ion; E, F, and G, are alkaline earth ions and/or transition metal ion; x is an amount of up to about 0.7; y is an amount of up to about 1; p and q are amounts of up to about 0.3; and t is an amount of about 0.05 to about 0.10, u is an amount of up to about 0.5, v is an amount of up to about 0.5 and w is an amount of up to about 0.25. A method for manufacturing an electron emissive composition comprises blending a barium tantalate composition with a binder; and sintering the barium tantalate composition with the binder at a temperature of about 1000° C. to about 1700° C.