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：US10388484B2

公开(公告)日：2019-08-20

申请号：US15757343

申请日：2016-12-30

Applicant: BEIJING UNIVERSITY OF TECHNOLOGY

Inventor： Jinshu Wang ,  Liran Dong ,  Jie Zhang ,  Mingchuang Tian ,  Jingchao Liu ,  Xiaoyang Chen ,  Xiao Han ,  Liyang Xiao

IPC: H01S4/00 ,  H01J23/05 ,  H01J9/04 ,  H01J23/04 ,  B22F3/24 ,  C23C8/20 ,  C23C8/80 ,  B22F5/12 ,  C22C32/00 ,  H05B6/66

Abstract: A carburized La2O3 and Lu2O3 co-doped Mo filament cathode is made from lanthanum oxide (La2O3) and lutetium oxide (Lu2O3) doped molybdenum (Mo) powders, the lanthanum oxide (La2O3) and lutetium oxide (Lu2O3) doped molybdenum (Mo) powders contain La2O3, Lu2O3 and Mo with the total concentration of La2O3 and Lu2O3 being 2.0-5.0 wt. % and the rest being Mo.

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.