Abstract
Anti-bombing insensitivity of La 2O 3–Y 2O 3–Mo cermet cathode material has been studied in this paper. The variation of maximum secondary emission coefficient δ max with time was measured. The cathode after life experiment was analyzed by means of SEM, EDS and XRD. The results showed that δ max of La 2O 3–Y 2O 3–Mo cermet cathode operating at 1100 °C under continuous electron bombardment of 300 W/cm 2 reached the maximum 3.35 at 200 h, and then decreased gradually. After bombardment for 500 h, the maximum secondary electron yield remained nearly the same. The δ max of La 2O 3–Y 2O 3–Mo cermet cathode was still about 2.5 after 1000 h operation, indicating that this kind of cathode had good anti-bombing insensitivity. The high δ max of La 2O 3–Y 2O 3–Mo cathode was related to the rare earth oxide layer on the surface at the high temperature and the amount of nanosized La 2O 3 particles on the Y 2O 3 layer. The decrease of the amount of La 2O 3 in the surface layer and pores in the cathode produced by the evaporation of MoO 2 which is the oxidation product of Mo, led to the decrease of δ max.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
