Method for preparing pressed scandia-doped dispenser cathodes using microwave sintering

US10651000B2 · kind B2 · utility

Assignee

• BEIJING UNIVERSITY OF TECHNOLOGY · CN

Inventors

• Wei Liu · Hangzhou City, CN
• Mingchaung Tian · Beijing, CN
• Jinshu Wang · Beijing, CN
• Fan Zhou · Shanghai, CN
• Yiman Wang · Beijing, CN
• Liran Dong · Beijing, CN
• Yunfei Yang · 罗泉乡, CN
• Quan Zhang · Rockville, US

Key dates

• Filing date: Jan 19, 2017
• Grant date: May 12, 2020
• Expiry date: Oct 18, 2037

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01J19/22
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present disclosure discloses a preparation method of pressed Scandia-doped dispenser cathode using microwave sintering. Embodiments of the present disclosure include dissolving some nitrates and ammonium metatungstate with deionized water to prepare a homogeneous solution. Precursor powder with uniform size is obtained by spray drying, the precursor powder is decomposed, and two-step reduction may be proceeded to form doped tungsten powder with uniform element distribution. The cathode is prepared by one-time microwave sintering. One-time forming of cathode sintering is realized, and sintering shrinkage and sintering time are reduced significantly. The method has excellent repeatability, and the cathode has a homogeneous structure and excellent emission performance at 950° C.