Antiemissive coatings

Vetrov, N. Z.; Kostrin, D. K.; Lisenkov, A. A.; Popova, M S

doi:10.1088/1742-6596/652/1/012032

Cited by 10 publications

(5 citation statements)

References 5 publications

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“…The problem is solved by the search for new materials, designs and manufacturing technologies of individual elements and lamps in whole [1,2]. As for the grids, it is worldwide accepted the only right direction -use of a wide range of coatings that meet the following requirements: high value of the emissivity, getter properties, low vapor pressure at operating temperature, ability to form stable solid solutions with condensable products of the thermionic cathode evaporation and a high work function to impart the surface of the electrodes with anti-emission properties [4]. As a long-term experience has shown, to obtain the required durability (tens of thousands of hours and above), it is necessary to apply special coatings with a thickness of about 10 µm (for the coatings with high quality and very high adhesion).…”

Section: Deposition Zonementioning

confidence: 99%

Pyrocarbon anti‐emission coatings for grid electrodes of powerful generator lamps

Kostrin

Кузнецов²

2020

Vak Forsch Prax

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Summary In this paper application of a layer of pyrocarbon as an anti‐emission coating on metal grids of powerful generator lamps is discussed. Deposition of the pyrocarbon layer was carried out by plasma‐assisted application with the use of a vacuum arc discharge, which allows reducing the process temperature and the level of energy consumed. SEM images of the surface of the applied coating at different stages of its growth are given. The process of pyrocarbon formation can be considered as crystallization from the gas phase and includes the stages of formation of nuclei on the surface and their subsequent growth. The effectiveness of the use of pyrocarbon coatings on the grids of powerful generator lamps was confirmed by a decrease in the emission current by about three times (up to a level of about 10 mA) compared to devices that use more traditional anti‐emission coatings, such as titanium hydride.

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Section: Deposition Zonementioning

confidence: 99%

Pyrocarbon anti‐emission coatings for grid electrodes of powerful generator lamps

Kostrin

Кузнецов²

2020

Vak Forsch Prax

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“…The reduction of the emission properties of the surface is achieved by forming an antiemission intermetallic coating Pt 3 Zr [8,9]. According to the calculation in the temperature range of vacuum annealing 1000…2000 K in the system ZrC (obtained by evaporation in a plasma of a vacuum arc discharge [10,11]) -Pt (deposited by electroplating) thermodynamically more likely are formed connections Pt 3 Zr -PtZr [12].…”

Section: Zusammenfassungmentioning

confidence: 99%

Accelerated testing of powerful electrovacuum devices

Lisenkov¹,

Pryalukhin²,

Kostrin

2018

Vak Forsch Prax

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Summary In this paper the factors influencing the service life of powerful generating lamps are considered. Possibilities of accelerated testing of the devices with the purpose of saving time and resources are described. The methodology and design of the research stand for accelerated testing are presented. Results of a study of the processes of mutual diffusion of the materials of the grid mesh and antiemission coating are shown. Criteria to evaluate the lifetime of the powerful electrovacuum devices are given.

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“…This method of coating formation using a pulsed plasma deposition of charged particles was applied to obtain an antiemission carbon coating [14] on the grid electrodes of generator lamps (Fig. 8) The studies have allowed to develop methods for controlling the deposition of particles from the plasma flow to the metal substrate, taking into account the bias voltage, which provides a change in the energy of charged particles within a wide range.…”

Section: Verbesserung Der Qualität Und Haftung Von Funktionsschichtenmentioning

confidence: 99%