Beijing University of Technology

Jinshu Wang

Wei Liu

Hongyi Li

Tieyong Zuo

Meiling Zhou

Yiman Wang

Liran Dong

Fan Yang

Jie Zhang

Xiao Han

Fan Zhou

Quan Wen Zhang

Jingchao Liu

Mingchaung Tian

Yunfei Yang

Mingchuang Tian

Xiaoyang Chen

Liyang Xiao

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&#xb0; C.

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

A carburized LaOand LuOco-doped Mo filament cathode is made from lanthanum oxide (LaO) and lutetium oxide (LuO) doped molybdenum (Mo) powders, the lanthanum oxide (LaO) and lutetium oxide (LuO) doped molybdenum (Mo) powders contain LaO, LuOand Mo with the total concentration of LaOand LuObeing 2.0-5.0 wt. % and the rest being Mo.

Carburized LaOand LuOco-doped Mo filament cathode

Impregnated rare earth metal-containing barium-aluminum-scandate cathodes with a rare earth oxide doped tungsten matrix and methods for the fabrication thereof are described. In one aspect, an impregnated rare earth metal-containing barium-aluminum-scandate cathode comprises: a rare earth oxide doped tungsten matrix, and an impregnated active substance. The active substance comprises scandium oxide (ScO), a second rare earth oxide, and barium calcium aluminate, wherein the molar ratio of Ba:Ca:Al is about 4:1:1.

Impregnated yttric or gadolinium-containing Barium-aluminum-scandate cathodes and their fabrication methods

In a method of manufacturing a pressed scandate dispenser cathode, firstly, scandium nitrate, barium nitrate, calcium nitrate, aluminum nitrate and ammonium metatungstate (AMT) are dissolved in de-ionized water, respectively, and then mixed with a solution of a cross-link agent such as citric acid and HO. After water bathing, the mixed aqueous solution turns into gel, and the powders are obtained after the gel calcination. Secondly, the calcined powders are reduced by hydrogen. Finally, the reduced powders are pressed into shapes and then sintered in the furnace with the atmosphere of hydrogen or by Spark Plasma Sintering (SPS 3.202-MK-V) in vacuum.

Method of manufacturing a pressed scandate dispenser cathode

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Jinshu Wang