Storage film-coating dipped barium-tungsten cathode and preparation method

A barium tungsten cathode and cathode technology is applied in the field of electric vacuum to achieve the effects of increasing emission current density, increasing storage capacity and prolonging life.

Inactive Publication Date: 2013-04-17
INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

The traditional film-impregnated barium-tungsten cathode, that i

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  • Storage film-coating dipped barium-tungsten cathode and preparation method
  • Storage film-coating dipped barium-tungsten cathode and preparation method

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Embodiment Construction

[0021] Such as figure 1 As shown, it is a schematic diagram of the structure of the storage-type film-impregnated barium-tungsten cathode of the present invention, which is composed of a molybdenum cylinder 1, a heater 2, and a cathode 3. The partition 11 in the molybdenum cylinder 1 divides the interior of the molybdenum cylinder 1 into two cavities. A heater 2 is fixedly connected in one cavity, and the lead wire of the heater 2 protrudes from the outer end; a cathode 3 is fixedly connected in the other cavity. Among them, the cathode 3 is axially divided into two layers of tungsten sponge matrix 31, 32, the inner layer tungsten sponge matrix 31 is connected with the partition 11, and the inner layer has a pore size of 40%-45%; the outer layer tungsten sponge matrix 32 has a pore size of 22%-24%. On the outer end surface of the outer tungsten sponge matrix 32, a layer of Os-Ir-Al film 33 is covered.

[0022] The specific technological process of the preparation of the stor...

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Abstract

The invention discloses a storage film-coating dipped barium-tungsten cathode and relates to an electron device technology. The cathode adopts the following chamber tungsten sponge matrix structure: the cathode is divided into both inner and outer tungsten sponge matrixes; the inner end face of the inner tungsten sponge matrix is fixedly connected with a partition; the rest faces of the inner tungsten sponge matrix are coated with the outer tungsten sponge matrix; the lateral surface of the outer tungsten sponge matrix is fixedly connected with the inner wall of another accommodating cavity; the inner tungsten sponge matrix has porosity of 40 percent to 45 percent; the outer tungsten sponge matrix has porosity of 20 percent to 22 percent; and the outer end face of the outer tungsten sponge matrix is coated with a 0s-Ir-Al film. The cathode disclosed by the invention has the characteristics of large emission current density, long service life and the like; and a DC (Direct Current) emission volt-ampere characteristic curve result shows that when the working temperature of the cathode is 950 DEG C, a current of a deviated point can reach 5A/cm<2>. According to the invention, the emission current density of the barium-tungsten cathode is improved; storage of active materials is improved; the service life of the cathode is prolonged to 12 to 15 years; and the development requirement of a space travelling wave tube on the long service life of the hot cathode is met.

Description

technical field [0001] The invention relates to the field of electric vacuum technology, in particular to a storage-type film-impregnated barium-tungsten cathode using a small chamber tungsten sponge matrix structure and a preparation method, thereby increasing the emission current density of the barium-tungsten cathode, increasing the storage of active materials, and prolonging the life of the cathode. Background technique [0002] With the development of vacuum microwave devices, especially military microwave devices, the life of the cathode is required to be greater than 10 years. For the long-life cathode, the following requirements should be met: (1) the working temperature is low, which reduces the evaporation of the active material and reduces the burden on the heat; (2) the work function is small, so that it can be provided at a lower working temperature The required emission current; (3) Sufficient storage of active substances to ensure continuous replenishment of t...

Claims

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Application Information

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IPC IPC(8): H01J23/04H01J9/02
Inventor 张明晨张洪来刘濮鲲俞世吉
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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