Barium-tungsten cathode with high current density and preparation method of cathode

A barium tungsten cathode and high current technology, which is applied in the field of barium tungsten cathode with high current density and its preparation, can solve the problems of low barium content of cathode active material, inability to work stably for a long time, uneven pore structure, etc.

Active Publication Date: 2012-08-15
HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This invention relates to an improved type of electrode used in electronic equipment that has better performance at higher frequencies than previous designs. These improvements include increased power output without sacrificing frequency response time or decreased signal distortion caused by impedance mismatches between different layers within the device's circuitry.

Problems solved by technology

Technological Problem: Microwaves have become more powerful than ever before due to their use over longer periods at higher frequencies (> 10 GHz). However, there may still exist challenging requirements such as maintain stable operation during these extreme conditions without losing too much energy from being absorbed by any materials present on it's surface.

Method used

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  • Barium-tungsten cathode with high current density and preparation method of cathode
  • Barium-tungsten cathode with high current density and preparation method of cathode

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Embodiment Construction

[0022] figure 1 Shown is the structure schematic diagram of barium tungsten cathode in the present invention, the barium tungsten cathode of this kind of high current density comprises cathode molybdenum cylinder 3 and the double-layer substrate that is filled in cathode molybdenum cylinder 3, and double-layer substrate comprises upper layer and lower layer, and upper layer is The spherical tungsten powder layer 1 is formed by pressing spherical tungsten powder as the base material, and the lower layer is a tungsten-rhenium alloy layer 2 formed by pressing tungsten powder and rhenium powder as the base material.

[0023] The particle size of the spherical tungsten powder in the upper spherical tungsten powder layer 1 is 2 μm to 10 μm, preferably 4 μm; the tungsten powder and rhenium powder in the lower tungsten-rhenium alloy layer 2 are mixed according to the ratio of 10% to 50%: 90% to 50%. Evenly, the proportioning ratio is preferably 20%:80%.

[0024] A method for preparing a

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Abstract

The invention discloses a barium-tungsten cathode with high current density and the preparation method of the cathode. The barium-tungsten cathode comprises a cathode molybdenum tube (3) and a double-layer substrate filled in the cathode molybdenum tube (3), wherein the double-layer substrate includes an upper layer and a lower layer; the upper layer is a spherical tungsten powder layer (1) formed by pressing spherical tungsten powder serving as a substrate material and the particle size of the tungsten powder is 4mu m; the lower layer is a tungsten-rhenium alloy layer (2) formed by pressing tungsten powder and rhenium powder which are mixed to serve as the substrate material; and the tungsten powder and the rhenium powder are uniformly mixed in a ratio of 20%:80%. In the barium-tungsten cathode with high current density and a unique structure, the double-layer substrate is adopted, wherein the upper layer is formed by pressing the tungsten powder which has specific shape and specific particle size and serves as the substrate material; and the lower layer is formed by pressing the tungsten powder and the rhenium powder which are mixed to serve as the substrate material, the current density of 100A/cm<2> can be stably supplied, the requirements of high-power and high-frequency microwave devices on the cathode are met, and a powerful guarantee is provided for the development of the microwave devices.

Description

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Claims

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Application Information

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Owner HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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