12/17/2023 0 Comments Sic diode anode cathode![]() The performances of the cathodes are tested in the device with a configuration displayed in Fig. 3. These studies indicate that the properties and service lifetime of the metal/graphite–dielectric composite cathode are superior to those of a pure metal/graphite cathode, indicating the vast potential for development. 23, a copper–BaTiO 3 EEC is fabricated by spraying a layer of a ferroelectric material on the side of an annular copper base and the results show that the copper–BaTiO 3 cathode possesses a better emission property and a much longer lifetime than the normal copper cathode. 4 and 22, annular copper-glass EECs are fabricated and show preferable emission properties, which are much better than those of a pure copper cathode. 21, the experiments on a stainless steel EEC doped with TiO 2 ceramics show that fast cathode plasma formation already occurs at relatively low accelerating fields ( E ≤ 5 kV/cm) as a result of the surface flashover, which initiates in triple points located in micropores, and this type of cathode can be used successfully because it shows an extremely long lifetime and good reproducibility of the electron beam parameters. 16–20 As a result, the progress of the metal/graphite–dielectric composite cathode based on the metal/graphite cathode has become an important direction. In accordance with the mechanism of explosive electron emission (EEE), dielectric inclusions on the cathode surface can serve as potential emission micropoints and play an important role in the generation of pre-breakdown current and cathode plasmas. These results suggest that the SiC whiskers modified graphite cathode is suitable for applications under low magnetic field and large emission area conditions, while the SiC particles modified graphite cathode has a brighter application prospect in the long-time stable operation. SiC particles increase the emission capability of the graphite cathode, possibly corresponding to the dielectric properties of SiC particles. The experiments demonstrate that SiC whiskers accelerate the explosive emission turn-on speed of the graphite cathode for large field enhancement factors and improve the emission uniformity due to the surface flashover plasma generation mechanism. In order to improve the emission properties of the graphite cathode, modifications using SiC particles or whiskers are carried out by the in situ chemical vapor reaction method. Growing requirements are highlighted in the performance of the explosive emission cathode with the development of the high power microwave technology. Explosive emission cathodes are extensively used in high power microwave sources. ![]()
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