Beijing University of Technology

Meiling Zhou

Tieyong Zuo

Wei Liu

Lin Ma

Min Liu

Yue Zhao

Hongyi Li

Jinshu Wang

Hongli Suo

Fan Yang

Jie Zhou

Yaming Li

Yiman Wang

Shuai Ye

Lingji Ma

Zili Zhang

Dong He

Yingxiao Zhang

Yonghua Zhu

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

A composite article that can be used as a substrate for coated conductors is disclosed. The composite substrate has at least three layers in which one or more inner layers of Ni&#x2014;W alloys with 9 at. %-13 at. % W and two outer layers of Ni&#x2014;W alloys with 3 at. %-9 at. % W. The content of W element gradually decreases from the inner layers to the outer layers. The composite substrate can be prepared using a process of designing and sintering composite ingot, rolling composite ingot and then annealing composite substrate. The composite substrate have a dominant cube texture on the outer layer of the whole substrate which have a weaker magnetism and higher strength than that of a single Ni-5 at. % W alloy substrate. the preformed composite ingot is prepared by filling and compacting the Ni&#x2014;W mixed powders into a mold layer by layer according to the structure of composite substrate; in said mold, said preformed composite ingots are with the total thickness of 5-250 mm, the thickness of two outer layers being 2/9-&#x2154; of the total thickness.

Biaxially textured composite article

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

A composite article that can be used as a substrate for coated conductors is disclosed. The composite substrate has at least three layers in which one or more inner layers of Ni&#x2014;W alloys with 9 at. %-13 at. % W and two outer layers of Ni&#x2014;W alloys with 3 at. %-9 at. % W. The content of W element gradually decreases from the inner layers to the outer layers. The composite substrate can be prepared using a process of designing and sintering composite ingot, rolling composite ingot and then annealing composite substrate. The composite substrate have a dominant cube texture on the outer layer of the whole substrate which have a weaker magnetism and higher strength than that of a single Ni-5 at. % W alloy substrate. the preformed composite ingot is prepared by filling and compacting the Ni&#x2014;W mixed powders into a mould layer by layer according to the structure of composite substrate; in said mould, said preformed composite ingots are with the total thickness of 5-250 mm, the thickness of two outer layers being 2/9-&#x2154; of the total thickness. The method of the present invention can obtain the composite substrate with high mechanical strength and reduced magnetization owing to the use of the Ni alloy with high W content in the inner layers of the composite substrate.

Method of preparing a biaxially textured composite article

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Beijing, China

Meiling Zhou