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TWT impregnated Ba-W cathode and its preparation method

A barium tungsten cathode and traveling wave tube technology, applied in the field of traveling wave tubes, can solve the problems of increasing cost and affecting widespread use.

Inactive Publication Date: 2008-03-19
HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the doping of more expensive noble metal materials iridium, osmium or rhenium, the cost is significantly increased, which affects their widespread use

Method used

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  • TWT impregnated Ba-W cathode and its preparation method

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Embodiment Construction

[0020] Below in conjunction with Fig. 1, Fig. 2, the present invention is described in detail, a kind of traveling wave tube impregnated coated barium tungsten cathode, comprises cathode cylinder 4, the sponge body of the cathode that is positioned at cathode cylinder 4, the sponge body of described cathode is made of The tungsten sponge body 1 and the tungsten-rhenium sponge body 2 are press-fitted and connected, and the surface of the tungsten-rhenium sponge body 2 is provided with a precious metal film 3 . The tungsten sponge 1 has a pore size of 30±2%, and a thickness of 1.2±0.3mm; the tungsten-rhenium sponge 2 has a pore size of 25±2%, a weight ratio of tungsten and rhenium of 1:1, and a thickness of 0.4mm. ±0.1 mm; the noble metal film 3 is a rhenium film with a film thickness of 0.6-0.8 microns. The cathode salt 5 impregnated in the sponge body of the cathode is aluminate BaO: CaO: Al 2 o 3 The molar ratio is 2.4:0.6:1. The cathode surface can be planar or spherical....

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Abstract

The invention discloses a dip-coated barium-tungsten cathode for traveling-wave tubes and a preparation method thereof. The dip-coated barium-tungsten cathode comprises a cathode drum, a cathode spongy body positioned inside the cathode drum. The invention is characterized in that the cathode spongy body is laminated by a tungsten spongy body and a tungsten-rhenium spongy body, wherein the tungsten-rhenium spongy body is coated with a noble metal film on the surface. With the above structure and preparation method, compared with the prior art, the cathode spongy body is a two-layered cathode spongy body laminated by the tungsten spongy body and the tungsten-rhenium spongy body, to replace the single-layer alloy substrate with uniform porosity in the prior art; the consumption of the noble metal Re is reduced; the porosity of the tungsten spongy body is increased; the storage level of cathode salts is increased; and the preferable proportion of the cathode salts allows both the emission behavior and the stability of salts better. With the noble metal Re coating, the cost of target materials is reduced. The consumption of noble metal is greatly reduced while ensuring the maximal emission and long service life of alloy substrate film-coated cathodes. The storage quantity of cathode salts is increased and the service life of cathode is prolonged.

Description

technical field [0001] The invention relates to a traveling wave tube, in particular to a barium tungsten cathode impregnated with a traveling wave tube and a preparation method thereof. Background technique [0002] Microwave vacuum devices are known as the "heart" of systems such as radar, communication, electronic countermeasures, telemetry and remote control, and precision guidance. In the future, microwave vacuum devices will develop towards wider frequency bands, higher frequencies (such as Ku-band and millimeter waves) and greater power, while pursuing the direction of small size, low voltage, high reliability, and long life. To improve the power output and life of microwave vacuum devices, the volume reduction is directly related to the quality and technical level of the cathode. These all depend on the improvement of cathode emission current density, reliability and lifetime. However, the large emission and lifetime of the current impregnated barium-tungsten catho...

Claims

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Application Information

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IPC IPC(8): H01J23/04H01J9/02
Inventor 吴华夏李锐肖兵
Owner HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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