Grid used in grid-controlled pulse traveling wave tube electron gun and manufacturing process thereof

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. The gradient functional layer is prepared by Nb or Ta. The composite anti-grid electron emission film is prepared by using a high-melting point material having a work function of more than 4 eV. The manufacturing process includes the following steps: (1) performinghigh temperature vacuum degassing on the formed grid substrate of a molybdenum material at 700-1000 DEG C; (2) preparing the gradient functional layer on the grid substrate by using ion implantationand vacuum deposition coating; (3) preparing the composite anti-grid electron emission film on the gradient functional layer by using the ion implantation and vacuum deposition coating; and (4) performing high temperature heat treatment on the prepared grid. The grid of the invention can suppress grid electron emission of a 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 technical field of microwave electric vacuum. Background technique [0002] Grid-controlled pulse traveling wave tube has a series of advantages such as high gain, large power, wide working frequency, small size, light weight, and good reliability, making it suitable for satellite communications, missile guidance, radar reconnaissance, remote sensing and telemetry, electronic countermeasures and The key components of spacecraft positioning and docking equipment play an important role in the defense and aerospace fields. [0003] When the grid-controlled pulse traveling wave tube is working, since the working temperature of the cathode is as high as 1000-1050°C, a high-temperature resistant metal material must be used as the grid. At present, the grid-controlled pulse traveling wave tube uses molybdenum (Mo) as...

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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