Method of manufacturing a pressed scandate dispenser cathode

US7722804B2 · kind B2 · utility

Assignee

• BEIJING UNIVERSITY OF TECHNOLOGY · CN

Inventors

• Jinshu Wang · Beijing, CN
• Wei Liu · Hangzhou City, CN
• Meiling Zhou · Beijing, CN
• Yiman Wang · Beijing, CN
• Hongyi Li · Ottawa, CA
• Tieyong Zuo · Beijing, CN

Key dates

• Filing date: Aug 8, 2007
• Grant date: May 25, 2010
• Expiry date: Jan 23, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/12
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In a method of manufacturing a pressed scandate dispenser cathode, firstly, scandium nitrate, barium nitrate, calcium nitrate, aluminum nitrate and ammonium metatungstate (AMT) are dissolved in de-ionized water, respectively, and then mixed with a solution of a cross-link agent such as citric acid and H2O2. After water bathing, the mixed aqueous solution turns into gel, and the powders are obtained after the gel calcination. Secondly, the calcined powders are reduced by hydrogen. Finally, the reduced powders are pressed into shapes and then sintered in the furnace with the atmosphere of hydrogen or by Spark Plasma Sintering (SPS 3.202-MK-V) in vacuum.