Russian Journal of Applied Chemistry, Vol. 74, No. 8, 2001, p. 1428. Translated from Zhurnal Prikladnoi Khimii, Vol. 74, No. 8, 2001, p. 1388. Original Russian Text Copyright C 2001 by Morachevskii. ˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝ BOOK REVIEWS ˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝˝ Prilutskii, V.S., Vol’framovyi torirovannyi karbidirovannyi katod (Carbidized Thoriated Tungsten Cathode), Moscow: Ruda i Metally Publ. House, 2001. 152 pp. Thoriated tungsten (tungsten wire with ThO ad- sistivity, thermal and physical and physicomechanical ditive) was proposed as emitter and material for fab- characteristics). The fourth chapter (pp. 45356) dis- rication of cathodes for electronic valves by Langmuir cusses the physical understanding of how the CTTCs as far back as 1915. Thorium dioxide additive (1 32%) operate. Their high emissive ability is ensured by enables much stronger electron emission as compared the presence on the cathode surface of a nearly mono- with pure tungsten. The cathode performance can layer-thick film of thorium atoms. The fifth chapter be substantially improved further by using cathodes (pp. 57370) is concerned with specific features of the made of thoriated tungsten whose surface layer is design and calculation of CTTCs, the sixth chapter converted into tungsten carbide W C (carbidized). (pp. 71381) considers the specific features of their The monograph by Prilutskii considers from modern fabrication technology. standpoint the theory and practice of designing and The seventh chapter (pp. 82 3107) discusses prob- fabricating carbidized thoriated tungsten cathodes lems associated with the service life of CTTCs, de- (CTTC). The book comprises introduction, nine termined by a combination of factors. Ways to make chapters, supplement, and bibliography including 171 the service life of a cathode longer are discussed. references to works of domestic and foreign authors. The eighth (pp. 108 3119) and ninth (pp. 1203130) The first chapter considers properties of tungsten chapters contain special evidence concerning the de- carbides: phase diagram of the system tungsten 3car- sign and calculation of cathodes and their accelerated bon, various properties of the carbides, and the nature longevity tests. of chemical bonding in these materials. The second The monograph as a whole gives integrated con- chapter (pp. 21341) is devoted to the technology of sideration to the theory and practice of CTTC design carbidization and activation of CTTCs. Among the and fabrication and is largely based on the author’s methods for obtaining tungsten carbides, the follow- working experience. ing are discussed: synthesis from elements, reduction of carbides by carbon, chemical isolation from alloys, In addition to accomplishing strictly specialized electrolysis of molten media, and gas-phase deposi- purposes, the evidence presented in the monograph tion. Also considered is the process of CTTC fabri- may be of interest for specialists in inorganic mate- cation and optimization. A very brief third chapter rials science and technology of electronic materials. (pp. 42344) contains evidence concerning some prop- erties of carbidized thoriated tungsten (electrical re- A. G. Morachevskii 1070-4272/01/7408-1428 $25.00 C 2001 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry – Springer Journals
Published: Oct 13, 2004
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