326. Production eyes new furnace for vacuum heat treating

Abstracts 323--331 37 22 323 An Omegraton Mass Spectrometer and its Characteristics An omegatron with noble-metal electrodes is described, which can be given a constant sensitivity to within 10 per cent by the application of a statable electrostatic field The sensmvity is not even affected by the action of corrosive gases and vapours, such as H20, CO2 and CH4, over long periods, and is reproducible from omegatron to omegatron as long as the dimensions are kept constant A comparison of the lomzatlon probabd~ty given in the literature with that calculated from the cahbration curve of the omegatron shows that nearly all the resonance ions formed by the electron beam reach the ion collector The adjustment of the operating data, needed to achieve thin cond~tton ~s in general independent of the mass Some characterlst~cs of the omegatron are described (Authors) A Klopfer and W Schmldt, Vacuum, 10, 363-372, 1960 37 41 43 324. Vacuum Treatment of Molten Steel--a New Way of Improving Converter Steel Production A M Samarm and L M Novik, Vacuum, 9, 134-138, 1959 37 325. Purification of Tantalum Obtained by Vacuum Arc Melting The purest commercmlly avadable tantalum powder was consohdated by a single, vacuum, consumable-arc melting operation yielding ingots of considerably higher purity than the original powder Interstitial and metalhc impurity analyses are presented for a large number of heats made under consistent cond~hons of ingot and electrode size, arc current, and furnace pressure The effect of carbon addition to an oxygen-rich starting material was investigated, and the optimum carbon-oxygen ratio for maximum refinement has been located approximately Under favorable conditions, the oxygen content is reduced by approximately one order of magmtude (Author) M L Torh, J Electrochem Soc, 107, 33-35, January 1960

309

Analysis of Partial Pressures b) Farvitron See Abstr No 226

37 22 Cahbratlon Factors of Ionization Gauges for Hydrocarbon Gas Mixtures See Abstr No 288 37 22 12 31 33 38 The Apphcabihty of the Omegatron to Continuous Analysis of Residual Gases See Abstr No 291 37 22 27 Measurements on the Properties of a Stmple Omegatron See Abstr No 294 37 22 21 33 47 Experience in Using Mass-Spectrometric Methods in ElectroVacuum Technology See Abstr No 296 37 30 56 Vaeuum Deposition of Dielectric Films for Capacitors See Abstr No 304

Residual Gases in Picture Tubes

37

327 New Vacuum Melt Furnace Starts Up Note by A n o n , Iron Age, 187, 47, January 26, 1961

37 See Abstr No 309

31

22

37 33 41 Application de la Technique du Vide a la Fabrication des Transistors See Abstr No 313

Melting in the Electron Beam Furnace Vacuum Casting of Steel

37 326. Production Eyes New Furnace for Vacuum Heat Treating Article by A n o n , Iron Age, 187, 84-85, January 19, 1961

37 11 12 38 22 Means of Omegatron and

37 41 See Abstr No 350

21

37

41

See Abstr No 351

37 41 21 Le Traitement sous Vide des M6taux et de l'Aeler en partleuher See Abstr No 353 37 48 21 20 Design Considerations for Vacuum Metallurgical Equipment See Abstr No 370

37

328 New Vacuum Process for Heat Treating Tool Steels Note by A n o n , Metal Progress, 80, 7-8, July 1961

38.

Distillation, Organic Chemistry, Isotopic Gas Analysis

37

329. Large Electron-Beam Furnace Refines Refractory Metals Note by A n o n , Metal Progress, 80, 9-10, August 1961

38 11 12 31 33 37 The Investigation of Residual Gases in Vacuum Systems See Abstr No 224

37 330. Ztrcaloy-2 IS Vacuum Hot Pressed Note by A n o n , Materials In Design Englneermg, 54, 15, July 1961

38 11 16 31 33 37 Evolution and Absorption of Gases m Electron Tubes See Abstr No 225

37

331 Vacuum-Degassed Steel Note by A n o n , Mechamcal Engmeermg, 83, 60, August 1961 37 11 12 31 33 38 The Investigation of Residual Gases m Vacuum Systems See Abstr No 224 37 11 16 31 33 38 Evolution and Absorption of Gases in Electron Tubes See Abstr No 225

38 11 12 37 22 Analysis of Partial Pressures by Means of Omegatron and Farvltron See Abstr No 226 38 22 12 31 33 37 The Apphcabihty of the Omegatron to Continuous Analysis of Residual Gases See Abstr No 291 38 Vacuum in Medicine.

See Abstr No 378

54

36