field emission neutralizer

Abstract

The invention provides a field emission neutralizer, which includes a bottom plate and at least one cathode emission unit fixed on the surface of the bottom plate, and the cathode emission unit includes a base plate, a casing, a cathode emitter, a grid, and a The shielding layer, the casing is located on the substrate, the cathode emitter is fixed inside the casing and is insulated and spaced from the grid, the grid is insulated and spaced from the shielding layer, the casing has an opening, the The grid includes a plurality of grid holes, the shielding layer has a through hole, the opening, the grid hole and the through hole are set through, the cathode emitter includes a cathode base and a graphitized carbon nanotube array, and the cathode base includes a A base body and a binder layer, the graphitized carbon nanotube array is fixed on the base body through the binder layer, and the carbon nanotubes in the graphitized carbon nanotube array are substantially perpendicular to the base body.

Description

technical field [0001] The invention relates to a field emission neutralizer, in particular to a field emission neutralizer using a graphitized carbon nanotube array as an electron emitter. Background technique [0002] The main function of field emission neutralizers is to emit electrons to neutralize positive ion charges. Field emission neutralizers have a wide range of applications. For example, field emission neutralizers are an important part of space electric propulsion. The main function of neutralizers is to emit electrons and neutralize ion charges to prevent system charge accumulation. If the neutralizer A fault may cause the thrusters to fail to start, or the voltage of the system may rise tens of thousands of volts instantaneously. [0003] Carbon nanotubes have good electrical conductivity and high electron emission efficiency, and are very suitable for cathode emission emitters. However, in the existing field emission neutralizers using carbon nanotube emitte...

AI Technical Summary

Problems solved by technology

However, in the existing field emission neutralizers using carbon nanotube emitters, generally disordered carbon nanotubes are used as electron emitters, and the emission efficiency is low, and the carbon nanotubes have not been graphitized. There are great growth defects in the microstructure of nanotubes, for example, there is a disordered layer structure, there are dislocations and defects in the microcrystalline structure, there are non-carbon atoms, amorphous carbon, and low crystallinity, etc., during the process of emitting electrons Carbon nanotubes are very easy to become powder, resulting in low efficiency of emitting electrons, or even failure to emit electrons

Images