Search academic texts

Information × Registration Number 0203U008810, 0102U002373 , R & D reports Title The producing of ceramic cathode assemblies with the monocrystal lanthanum hexaboride emitter for devices of electronic - probe analysis and of technological assigning popup.stage_title Head Loboda Petro Ivanovych, Доктор технічних наук Registration Date 29-12-2003 Organization National Technical University of Ukraine "Kyiv Polytechnical Institute", Physical-ingeneering Faculty popup.description2 With the purpose of security of reproducibility expluatation performances of cathodes from the most effective thermoemission material - single-crystal lanthanum hexaboride the new generation of ceramic cathode-heating assemblies and technological fundamentalses of their manufacting by catting of massive three-focus globe compositions which consist of connected rather massive preforms of the LaB6 emitter, heater and current supplies fixed on a standard ceramic core is obtained. Localization of a heat-up of the cathode near emitting surface is achieved at the expense of use of more high-ohmic heater by width of 1-1,5 mm, connected with the emitter and current supplies in one-piece. Current supplies are produced from viscous directed reinforced borides ceramics with low electric resistance (r = 6-10 mkОm sm) and durability (1200-1400 МPа). Physical and chemical fundamentalses of technological processes of manufacture reinforced borides ceramics by the directed crystallization from melt and sintering of high uniformly mixtures of dispersible dusts in conditions of high-speed heat and the big temperature gradient are developed. By resource trials it is shown, that obtained ceramic cathode assemblies for power do not yield, and behind spatial - geometrical performances and adaptability to manufacture of manufacture exceed the best world analogs. Ceramic cathode assemblies effectively may be used instead of tungstic in serial gears of electron-probe analysis and technological devices with high-intensity bunches. Product Description popup.authors popup.nrat_date 2020-04-02 Close