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1.发明申请公开(公告)号：US20170345608A1
公开(公告)日：2017-11-30
申请号：US15409888
申请日：2017-01-19
发明人： Wei Liu , Mingchaung Tian , Jinshu Wang , Fan Zhou , Yiman Wang , Liran Dong , Yunfei Yang , Quan Zhang
CPC分类号： H01J9/04 , B22F3/105 , B22F9/026 , B22F9/22 , B22F9/30 , B22F2003/1054 , B22F2998/10 , C22B34/36 , H01J1/28 , H01J19/22 , H01J35/06 , B22F3/02
摘要： 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.
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公开(公告)号：US09646796B1
公开(公告)日：2017-05-09
申请号：US14218680
申请日：2014-03-18
发明人： Jin-Shu Wang , Wei Liu , Li-Ran Dong , Qiang Wang , Xiang Liu , Fan Zhou , Mei-Ling Zhou , Tie-Yong Zuo
摘要： A method of manufacturing carburized Lu2O3 doped Mo cathodes for thermionic emission for magnetrons is described. The Lu2O3 doped Mo powder is prepared by sol-gel method. The powder is reduced thoroughly in hydrogen atmosphere. Afterwards, the powder is die-pressed into pellets, followed by sintering in hydrogen and carburization in activated carbon powder to obtain the carburized Lu2O3 doped Mo cathode.
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公开(公告)号：US10651000B2
公开(公告)日：2020-05-12
申请号：US15409888
申请日：2017-01-19
发明人： Wei Liu , Mingchaung Tian , Jinshu Wang , Fan Zhou , Yiman Wang , Liran Dong , Yunfei Yang , Quan Zhang
IPC分类号： B22F3/105 , H01J9/04 , B22F9/02 , B22F9/22 , C22B34/36 , B22F9/30 , H01J1/28 , H01J19/22 , H01J35/06
摘要： 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.
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