Method for preparing Ni-Re sponge oxide cathode

An oxide cathode, ni-re technology, applied in the field of electric vacuum, can solve the problems of reduced cathode activity and end of cathode life, and achieve the effects of reducing cathode temperature, enhancing cathode activity, and increasing emission current density

Inactive Publication Date: 2014-03-26
INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

However, as the cathode works for a period of time, due to the increase in the resistance of the intermediate layer, the cathode activity will gradually decrease, resulting in the end of the cathode life.

Method used

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  • Method for preparing Ni-Re sponge oxide cathode
  • Method for preparing Ni-Re sponge oxide cathode
  • Method for preparing Ni-Re sponge oxide cathode

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Embodiment Construction

[0014] The method for preparing Ni-Re sponge oxide cathode of the present invention comprises the steps:

[0015] Step a, prepare NH 4 ReO 4 (Ammonium perrhenate) aqueous solution.

[0016] According to the present invention, any existing method can be used to prepare NH 4 ReO 4 Aqueous solutions, however, need to ensure that NH 4 ReO 4 The mass ratio to water is 1:15 to 1:5, preferably 1:10.

[0017] In a specific embodiment of the present invention, the NH 4 ReO 4 Crystal powder dissolved in deionized water, NH 4 ReO 4 Crystal powder accounted for less than 10% by mass of deionized water, heating the solution to above 60°C, to NH 4 ReO 4 The crystals are completely dissolved to produce NH 4 ReO 4 aqueous solution.

[0018] Step b. Dip the Ni mesh sintered with the Ni sponge layer into the NH 4 ReO 4 In the aqueous solution, NH is adsorbed in the Ni sponge layer 4 ReO 4 .

[0019] According to the present invention, the Ni mesh can be a Ni substrate, the su...

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Abstract

The invention discloses a method for preparing a Ni-Re sponge oxide cathode. The method comprises the following steps: immersing a Ni net sintered with a Ni sponge layer in NH4ReO4 water solution to enable the Ni sponge layer to absorb NH4ReO4; sintering the Ni net to enable the Ni sponge layer containing NH4ReO4 to be converted into a Ni-Re sponge layer; and applying carbonate in the sponge holes and on the surface of the Ni sponge layer of the Ni net. By the adoption of the method of the invention, the emission current density of the Ni sponge oxide cathode can be improved, the working temperature of the cathode can be reduced and the activity of the cathode can be enhanced.

Description

technical field [0001] The invention belongs to the field of electric vacuum technology, in particular to a method for preparing a Ni-Re sponge oxide cathode by impregnating a Re (rhenium) salt solution in a Ni (nickel) sponge, so as to improve the doping of Re in the Ni sponge Uniformity, thereby improving the cathode emission current density of the Ni sponge oxide cathode, reducing the cathode operating temperature, and enhancing the cathode activity. Background technique [0002] Oxide cathode is one of the most widely used hot cathodes in electric vacuum devices. In the development of oxide cathodes, in order to enhance the mechanical strength of the cathode coating and the bonding between the surface oxide and the base metal, a Ni sponge layer with a thickness of less than 400 μm is generally sintered on the surface of the cathode base metal. This kind of porous Ni sponge layer can not only increase the storage of emission materials but also shorten the path of current...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J9/02
Inventor 王小霞赵青兰廖显恒李云张琪
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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