公开(公告)号：US5881355A

公开(公告)日：1999-03-09

申请号：US120373

申请日：1998-07-22

Applicant: Toshikazu Sugimura ,  Maki Narita ,  Taro Hirai ,  Shoichi Hata

Inventor： Toshikazu Sugimura ,  Maki Narita ,  Taro Hirai ,  Shoichi Hata

IPC: H01J9/04 ,  C22C1/05 ,  C22C32/00 ,  H01J1/28 ,  B22F1/00

CPC classification number: C22C1/05 ,  C22C32/0026 ,  H01J1/28 ,  B22F2998/10 ,  B22F2999/00

Abstract: A method of fabricating a cathode member or pellet is provided, which realizes the sufficiently large increase of the electron emission capability by the current activation process and that prevents the maximum cathode current from being lowered as long as an electron emissive agent exists in the cathode member. First, (a) a nickel powder and a rare-earth-metal oxide powder are provided. (b) The nickel powder and the rare-earth-metal oxide powder are uniformly mixed together, thereby producing a first powder mixture. (c) The first powder mixture is heated in a hydrogen atmosphere, an inert atmosphere, or a vacuum atmosphere, thereby producing an intermetallic compound of nickel and the rare-earth metal in the first powder mixture. (d) The first powder mixture containing the intermetallic compound is uniformly mixed with an electron-emissive agent powder, thereby producing a second powder mixture. (e) The second powder mixture is sintered by a HIP process, thereby forming a cathode member. The intermetallic compound produced in the first powder mixture has a function to chemically decompose the electron emissive agent to thereby increase the electron emission performance of the electron emissive agent.

Abstract translation: 提供一种制造阴极部件或丸粒的方法，其通过电流活化过程实现了电子发射能力的足够大的增加，并且只要阴极部件中存在电子发射剂，就可以防止最大的阴极电流降低 。 首先，提供（a）镍粉和稀土金属氧化物粉末。 （b）将镍粉末和稀土金属氧化物粉末均匀混合，制成第一粉末混合物。 （c）将第一粉末混合物在氢气氛，惰性气氛或真空气氛中加热，由此在第一粉末混合物中产生镍和稀土金属的金属间化合物。 （d）将含有金属间化合物的第一粉末混合物与电子发射剂粉末均匀混合，从而产生第二粉末混合物。 （e）通过HIP工艺烧结第二粉末混合物，从而形成阴极部件。 在第一粉末混合物中产生的金属间化合物具有化学分解电子发射剂的功能，从而增加电子发射剂的电子发射性能。

公开(公告)号：US5757115A

公开(公告)日：1998-05-26

申请号：US455998

申请日：1995-05-31

Applicant: Maki Narita ,  Toshikazu Sugimura ,  Hiroyuki Sakatani ,  Tsuyoshi Tanabe

Inventor： Maki Narita ,  Toshikazu Sugimura ,  Hiroyuki Sakatani ,  Tsuyoshi Tanabe

IPC: B22F5/00 ,  H01J1/14 ,  H01J1/28 ,  H01J9/04 ,  H01J1/02 ,  H01J1/38 ,  H01J19/06

CPC classification number: H01J9/042 ,  H01J1/28

Abstract: With a production of a cathode member for an electron tube having cathode materials containing Ni, a metal having a reduction behavior and an electron emissive agent sintered to be one body and its electron emitting surface subjected to a specular processing, it is possible to obtain an inexpensive cathode characterized by that: the operation temperature is low; the electron emission distribution is excellent because of the smooth electron emitting surface; and the electron emission is enabled with a high current density for a long interval of time.

Abstract translation: 通过生产具有阴极材料的阴极材料的阴极材料，其具有Ni，具有还原特性的金属和烧结成一体的电子发射剂，其电子发射表面进行镜面加工，可以获得 廉价的阴极，其特征在于：操作温度低; 由于电子发射面平滑，电子发射分布极好; 并且电子发射能够在长时间间隔内以高电流密度实现。

公开(公告)号：US5306189A

公开(公告)日：1994-04-26

申请号：US947413

申请日：1992-09-18

Applicant: Toshikazu Sugimura ,  Maki Narita

Inventor： Toshikazu Sugimura ,  Maki Narita

IPC: H01J1/28 ,  H01J1/30 ,  H01J9/04

CPC classification number: H01J1/28 ,  H01J1/30 ,  H01J9/042

Abstract: An impregnated cathode including an electron emissive substance in a porous matrix of a metal having a high melting point and a heat resistive property, is manufactured by mixing (S2) powder of the metal and the electron emissive substance in a dry state into cathode forming powder, press-shaping (S3) the cathode forming powder into a shaped body, sealing (S4) the shaped body in a reaction vessel to provide a sealed vessel, and subjecting (S5) the shaped body in the sealed vessel to a hot isostatic press (HIP) to provide a sintered body of the cathode forming powder, wherein the substance comprises a barium aluminate compound represented by a chemical formula of:(pBaO.qCaO).nBaAl.sub.2 O.sub.4,where p represents an integer which is not less than one, q representing an integer which is not less than zero, n representing an integer which is not less than one. Preferably, the HIP is carried out at a temperature between 900.degree. C. and 1400.degree. C. for twenty minutes with the sealed vessel placed in an argon atmosphere of 1500 atmospheres. The cathode preferably includes the substance in a ratio which is greater than 5.7% by weight and is not greater than 13.8% by weight.

Abstract translation: 通过将（S2）金属粉末和电子发射物质（S2）混合成阴极形成粉末（S2），制造具有高熔点和耐热性的金属的多孔基体中的电子发射物质的浸渍阴极 ，将阴极形成粉末压成型（S3）成型体，将反应容器内的成形体密封（S4），以提供密封容器，并将密封容器中的成形体（S5）（S5）加热至等静压机 （HIP）以提供阴极形成粉末的烧结体，其中该物质包含由以下化学式表示的铝酸钡化合物：（pBaO.qCaO）·nBaAl2O4，其中p表示不小于1的整数，q 表示不小于零的整数，n表示不小于1的整数。 优选地，将HIP在900℃至1400℃的温度下进行20分钟，同时将密封容器置于1500个大气压的氩气气氛中。 阴极优选包含大于5.7重量％且不大于13.8重量％的比例的物质。