Graphite contact-holding electrode used for hollow negative electrode
A technology of hollow cathode and contact holding pole, which is applied in the direction of installation/support/configuration/insulation of discharge tube solid thermionic cathode, electrode assembly, main electrode of discharge tube, etc., to improve life and reliability, reduce heat loss, highly reliable effect
Active Publication Date: 2017-02-01
LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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Problems solved by technology
According to the sputtering corrosion problem of the contact pole top of the tantalum contact pole hollow cathode developed at home and abroad in the thruster life test, it is revealed that the sputtering corrosion problem of the hollow cathode pole contact pole is a factor that restricts the long life and high reliability of thruster products. most important factor
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[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0019] Such as figure 1 As shown, a graphite contact electrode for hollow cathode is mainly composed of contact electrode cylinder 1, heat shield jacket 2, molybdenum-rhenium foil 3, heat shield support 4, exhaust pad 5, insulating ceramic 6, fastening components 7 and a shielding cover 8;
[0020] The end surface of the closed end of the contact holding pole cylinder 1 is provided with a central hole, and the outer circumferential surface of the open end is provided with a radial installation plane; the material of the contact holding pole cylinder 1 has a density of 2.09g / cm 3 Graphite material with a purity >99.998%; the heat shield jacket 2 is a cylindrical structure with one end closed and one end open, rolled from tantalum foil, with a central hole on the end surface of the closed end, and rolled on the heat shield jacket The inner peri...
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Abstract
The invention relates to a graphite contact-holding electrode used for a hollow negative electrode, and belongs to an aerospace electric propulsion technology and the vacuum electronic field. The graphite contact-holding electrode mainly comprises a contact-holding electrode barrel, a thermal screen jacket, a molybdenum-rhenium foil, a thermal screen supporting part, an air exhausting cushion, an insulating ceramic part and a fastening assembly, wherein the graphite contact-holding electrode is prepared from a high-density graphite material, so that the sputtering etching resistance of the graphite contact-holding electrode is improved, the service life of the hollow negative electrode is prolonged, and the reliability of the hollow negative electrode is improved; residual gas in the graphite contact-holding electrode can be exhausted through the air exhausting cushion, so that a partial discharge phenomenon in a vacuum environment is avoided; and by virtue of a convex structure manufactured on the thermal screen jacket, a contact area between the thermal screen jacket and the molybdenum-rhenium foil can be reduced, thereby reducing the thermal loss of the contact-holding electrode and improving the effective thermal efficiency of the contact-holding electrode.
Description
technical field [0001] The invention relates to a graphite contact pole used for a hollow cathode in a thruster, and belongs to the fields of aerospace electric propulsion technology and vacuum electronics. Background technique [0002] Facing the future needs of large-scale spacecraft orbit transfer and long-distance deep space exploration for high specific impulse and high-thrust electric propulsion technology, long-life, high-reliability hollow cathode design technology is a key technology that urgently needs breakthroughs in the thruster development process. Tasks such as deep space exploration require that the life of the hollow cathode be greater than 40,000 hours, and the number of power on and off is greater than 20,000 times. According to the sputtering corrosion problem of the contact pole top of the tantalum contact pole hollow cathode developed at home and abroad in the thruster life test, it is revealed that the sputtering corrosion problem of the hollow cathode...
Claims
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Login to View More IPC IPC(8): H01J1/13H01J1/88
CPCH01J1/13H01J1/88
Inventor 杨威郭宁唐福俊冯杰刘明正王倩楠李沛
Owner LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH