Nickel alloy seamless evaporator for preparing photocathode coatings, and machining method

Abstract

The invention relates to the evaporation field of photocathode coatings for night vision devices, and provides a nickel alloy seamless evaporator for preparing the photocathode coatings. The seamless evaporator is formed by machining seamless evaporating pipes with trapezoidal cross sections, and comprises a middle flat part, material holding parts and electrodes; a round hole is formed in the center of the upper bottom edge or the lower bottom edge of the middle flat part; the material holding parts are arranged at both ends of the middle flat part; and the electrodes are arranged at the side, far away from the middle flat part, of the material holding parts. The invention also provides a making method of the evaporator. The method comprises the steps of firstly, slightly flattening the part near the round hole in the center of the trapezoidal seamless evaporating pipe, and leaving a gap as a steam discharging channel; then, putting evaporating materials which are equal in mass into both ends of the evaporating pipe; and finally, flattening both ends of the evaporating pipe as the electrodes. The evaporator and the method provided by the invention have the beneficial effects of simple processing technology and easy realization of mechanization; the coatings are easy to form on the photocathode uniformly and stably, and the photoelectric conversion rate of the photoelectric surface of a low light level image intensifier is improved; and the requirements for preparation of various photocathode coatings can be met.

Description

technical field [0001] The invention relates to the technical field of photocathode coating evaporation technology for night vision devices, in particular to a nickel alloy seamless evaporator for preparing photocathode coatings and a processing method. Background technique [0002] Low-light night vision technology uses vacuum and electron optics to realize the conversion of photon image-electronic image-photon image. The low-light night vision device converts natural light such as low-brightness luminous light, star moonlight, and atmospheric glow reflected by night targets into electrical signals, and then enhances the electrical signals by tens of thousands or even tens of millions of times. The electrical signal is converted into light, so that it is suitable for the naked eye to carry out reconnaissance, observation, aiming, vehicle driving and other battlefield operations at night. [0003] The core component of the low-light night vision device is the low-light imag...

AI Technical Summary

Problems solved by technology

The existing evaporator has great defects in structure: the existing evaporator has gaps, which will greatly increase the difficulty of processing, and it is easy to leak powder if you are not careful; at the same time, it will lead to poor mechanical properties of the evaporator. Low, if the air pressure is high during the evaporation process, it will even cause the gap to expand and cause powder leakage, which will cause irreparable pollution to the photocathode; and if the gap is not processed uniformly, it will also lead to unstable steam overflow, which will easily cause evaporation. Uneven coating

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