Emitting material of cathode without photosensitive gas discharge tube

Abstract

The formula of the material adopted by the preparation is as following: cerium oxide 1000mg+caesium carbonate 200mg+magnesia 100mg+deionized water 100ml. The light sensitive phenomena will not appear for the gas discharge tube prepared by using the cathode emission material adopted by the invention. Since there is no radioactive material used in the formula of the materials, thus the material does not hurt human body so as to possess the practicability for production.

Description

Technical field: [0001] The invention relates to a cathode emitting material of a non-photosensitive gas discharge tube, which is applied to a gas discharge tube, a key component for lightning protection. Background technique: [0002] As an overvoltage protection element, the gas discharge tube can be widely used in communication, CATV and various low-voltage electrical equipment to prevent the communication system and equipment from being damaged by overvoltage (such as lightning strikes, external large-scale equipment switch interference). Therefore, it is very critical that the gas discharge tube has a stable discharge breakdown voltage value. However, the cathode emission materials used in current gas discharge tubes (such as patent application No. 89219163 and CN87.1.04930A) all have the problem of unstable breakdown voltage, especially under the conditions of light and no light, the breakdown voltage deviation It is very large (that is, the photosensitive effect), be...

AI Technical Summary

Problems solved by technology

However, the cathode emission materials used in current gas discharge tubes (such as patent application No. 89219163 and CN87.1.04930A) all have the problem of unstable breakdown voltage, especially under the conditions of light and no light, the breakdown voltage deviation It is very large (that is, the photosensitive effect), because light is a kind of energy, and photons can reduce the surface barrier of the cathode material, thereby reducing the work function. As a lightning protection component, it is sometimes in a light environment, sometimes in a In the dark, this will make the breakdown voltage change with the environment, that is, the breakdown voltage is unstable, so that the expected purpose of preventing overvoltage cannot be achieved

In the past, this problem was solved by adding radioactive elements to the cathode material, using the energy of α, β, and γ rays to generate initial electrons to participate in the emission of the cathode material, reducing the surface barrier and weakening the influence of light. Experiments have shown that in In the case of doping uranium and promethium elements, the photosensitive phenomenon basically disappears. However, radioactive elements are harmful to the human body and the environment, so not only are there difficulties in production, the production cost is greatly increased, and the use of users will also be damaged.

And if no radioactive elements are used, there will be photosensitivity phenomenon