公开(公告)号：US10651000B2

公开(公告)日：2020-05-12

申请号：US15409888

申请日：2017-01-19

Applicant: Beijing University of Technology

Inventor： Wei Liu ,  Mingchaung Tian ,  Jinshu Wang ,  Fan Zhou ,  Yiman Wang ,  Liran Dong ,  Yunfei Yang ,  Quan Zhang

IPC: B22F3/105 ,  H01J9/04 ,  B22F9/02 ,  B22F9/22 ,  C22B34/36 ,  B22F9/30 ,  H01J1/28 ,  H01J19/22 ,  H01J35/06

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.

公开(公告)号：US20170345608A1

公开(公告)日：2017-11-30

申请号：US15409888

申请日：2017-01-19

Applicant: Beijing University of Technology

Inventor： Wei Liu ,  Mingchaung Tian ,  Jinshu Wang ,  Fan Zhou ,  Yiman Wang ,  Liran Dong ,  Yunfei Yang ,  Quan Zhang

IPC: H01J9/04 ,  B22F9/02 ,  B22F3/105 ,  C22B34/36 ,  B22F9/22 ,  H01J35/06 ,  H01J1/28 ,  H01J19/22

CPC classification number: H01J9/04 ,  B22F3/105 ,  B22F9/026 ,  B22F9/22 ,  B22F9/30 ,  B22F2003/1054 ,  B22F2998/10 ,  C22B34/36 ,  H01J1/28 ,  H01J19/22 ,  H01J35/06 ,  B22F3/02

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.