A grid used in a grid-controlled pulse traveling wave tube electron gun and its manufacturing process

Abstract

The invention discloses a grid used in a grid-controlled pulse traveling wave tube electron gun and a manufacturing process thereof. The grid includes a grid substrate made of molybdenum, a gradient functional layer formed on the grid substrate, and a composite anti-grid electron emission film formed on the gradient functional layer; wherein the gradient functional layer is made of Nb or Ta, and the composite The anti-grid electron emission film is made of high melting point material with a work function greater than 4eV. The manufacturing process includes the following steps: (1) degassing the formed molybdenum grid substrate at 700-1000°C in high-temperature vacuum; (2) preparing a gradient function on the grid substrate by ion implantation and vacuum deposition coating method (3) Prepare a composite anti-grid electron emission film on the gradient functional layer by ion implantation and vacuum deposition coating method; (4) Perform high-temperature heat treatment on the prepared grid. The grid net of the invention can suppress the grid electron emission of the grid-controlled pulse traveling wave tube, and improve the working reliability and service life of the grid-controlled pulse traveling wave tube.

Description

technical field [0001] The invention relates to a grid used in a grid-controlled pulse traveling wave tube electron gun and a manufacturing process thereof, belonging to the field of microwave electric vacuum technology. Background technique [0002] Due to a series of advantages such as high gain, high power, wide operating frequency band, small size, light weight, and good reliability, the grid-controlled pulse traveling wave tube has become an ideal choice for satellite communications, missile guidance, radar reconnaissance, remote sensing and telemetry, electronic countermeasures, and Key components in spaceship positioning, docking and other equipment play an important role in the field of national defense and aerospace. [0003] When the gate-controlled pulse traveling wave tube is working, since the operating temperature of the cathode is as high as 1000-1050°C, it is necessary to use a high-temperature-resistant metal material as the grid. At present, molybdenum (Mo...

AI Technical Summary

Problems solved by technology

At the same time, because the distance between the cathode and the grid is very small, usually less than 1mm, when the cathode is working, the emitter evaporated from the cathode is easy to deposit on the grid, which will reduce the work function of the grid surface

The increase of the grid current will destroy the normal operation of the TWT, and in severe cases, the entire system will fail, thus greatly reducing the reliability and service life of the grid-controlled pulse TWT

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