Calcium aluminate thermionic emission device and preparation method

An emission device and electron emission technology, which is applied in the manufacture of thermionic cathodes, solid thermionic cathodes of discharge tubes, circuits, etc., can solve the problems of low thermoelectric conversion efficiency of thermionic emission devices, etc. work, reducing the effect of loss
CN112201555APending Publication Date: 2021-01-08SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHEAST UNIV
Publication Date
2021-01-08

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Abstract

The invention discloses a calcium aluminate thermionic emission device and a preparation method. According to the invention, a carbon derivative C12A7:C- / C with low work function and good conductivityis used as a novel coating material of a hot cathode electron emission electrode while a rare earth oxide coating is used to improve the electron absorption capability of a receiving electrode, and aspace between the emission electrode and the receiving electrode is filled with a low-vacuum argon atmosphere, so that the transmission process of heat emitting electrons from the emission electrodeto the receiving electrode is changed into plasma transmission from vacuum transmission so as to reduce the loss in the hot electron transmission process; and in a current thermionic emission device,a thermionic cathode emits electrons in an electric heating mode to obtain electron beams, and the thermionic emission device allows heat emission in a light heating mode to achieve direct conversionof thermoelectric energy and improve conversion efficiency.
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Description

technical field

[0001] The invention relates to a novel thermal electron emission device technology, which belongs to the technical field of thermoelectric energy conversion. Background technique

[0002] Thermionic emission device is a device that directly converts thermal energy into electrical energy by using thermionic emission phenomenon, and is currently the energy converter with the highest static thermoelectric conversion efficiency. In a thermionic emission device, metals or alloys such as tungsten and molybdenum are generally used as emitters and receivers to generate thermal electrons by means of thermal emission. In a thermionic emission device, the electrode materials of the emitter and the receiver have a great influence on the thermoelectric conversion efficiency. For thermionic emission materials to have good emission performance, the materials need to have a low work function. The smaller the work function, the better the effect of thermionic emission. [...

Claims

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