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  • Chemistry  (3)
  • hot corrosion  (1)
  • Condensed Matter: Electronic Properties, etc.
  • 1980-1984  (4)
Collection
Publisher
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Oxidation of metals 18 (1982), S. 195-223 
    ISSN: 1573-4889
    Keywords: Acidic and basic fluxing ; hot corrosion ; sulfate melts, super alloys
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The influence of the electrode potential on the corrosion behavior of a series of nickel- and cobalt-base gas turbine alloys has been investigated in a (mole %) 53Na2SO4+7CaSO4+40MgSO4 melt at 1073 and 1173 K and in a 90Na2SO4+10K2SO4 melt at 1173 K. Only acidic fluxing is observed in the (Na 2,Ca, Mg)SO4 melt at positive potentials while a protective scale rich in MgO is formed on all alloys at negative potentials. This scale prevents basic fluxing because MgO is insoluble in neutral and basic melts. The breakthrough potential for acidic fluxing is a function of the material composition. Increasing chromium content of the alloys extends the potential range of protective film formation. Acidic and basic fluxing are observed in the (Na, K)2SO4 melt. Acidic fluxing occurs at positive and basic fluxing at negative potentials. A protective scale is formed in an intermediate (neutral) potential range on the high-chromium alloys IN-597 and IN-738 LC. Here, too, the breakthrough potentials for acidic and basic fluxing are influenced by the composition of the alloys.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: PE Spectra and Molecular Properties. 89. Ionisation Patterns and Conformation of Cyclo Polythianes (H2CS)nCyclopolythianes (H2CS)n (n = 3, 4, 5) show characteristic low-energy ionization patterns, which are assigned to radical cation states with predominant sulfur lone pair contributions, and the correlation of which with topological eigenvalues ∊JHMO of a perimeter model exhibit the rather low standard deviation of only 0.08 eV. This finding suggests that the sulfur lone pairs should be equivalent on time-averaging. Geometry-optimized SCF calculations concerning preferred conformations as well as molecular flexibility of cyclopolythianes (H2CS)3 and (H2CS)4 in the gaseous phase, yield low barriers for transition between tub and chair conformers and also eigenvalue-sets which correlate with the PE data.
    Notes: Cyclopolythiane (H2CS)n (n = 3, 4, 5) besitzen im niederenergetischen Bereich charakteristische Ionisationsmuster, die Radikalkation-Zuständen mit überwiegendem Schwefelelektronenpaar-Anteil zuzuordnen sind, und deren Korrelation mit den topologischen Eigenwerten ∊JHMO eines Perimeter-Modells die geringe Standardabweichung von nur 0,08 eV aufweist. Dieser Befund legt nahe, daß im zeitlichen Mittel die Schwefel-Elektronenpaare äquivalent sein sollten. Geometrieoptimierte MNDO-Rechnungen über Vorzugskonformationen und zur Molekülbeweglichkeit von Cyclopolythianen (H2CS)3 und (H2CS)4 in der Gasphase ergeben niedrige Barrieren für die Übergänge zwischen Wannen- und Sessel-Formen und zugleich Eigenwert-Schemata, welche sich mit den PE-Daten korrelieren lassen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 464 (1980), S. 209-216 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Comparision of the Hitherto Known cis-Dihydrogenchalcogenido Complexes of d8 MetalsPhosphine-coordinated d8 metal dichlorides react in different ways with hydrogen-sulfide, sodium hydrogensulfide and sodium hydrogenselenide respectively. The phosphine ligand and the YH-providing reactand cut a great figure to get the monomere products. Some reactions of the dihydrogenchalcogenido platinum(II) compounds with sodium ethanolat and elemental sulfur respectively are investigated. I.r. and 1H-n.m.r. spectra are reported.
    Notes: Phosphankomplexierte Dichloro-d8-Metallverbindungen reagieren unterschiedlich mit Schwefelwasserstoff, Natriumhydrogensulfid bzw. Natriumhydrogenselenid. Der Phosphanligand und der YH-liefernde Reaktand spielen eine wichtige Rolle bei der Bildung monomerer Verbindungen. Einige Reaktionen der Dihydrogenchalkogenido-Platin(II)-Verbindungen mit Natriumethanolat bzw. elementarem Schwefel wurden näher untersucht. IR- und 1H-NMR-Spektren sind angegeben.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 35 (1984), S. 257-260 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The results of measurements of the thin film growth rate along the wall of long discharge tubes with flowing gas are presented. The dependence of the growth rate distribution along the tube wall on various parameters is discussed. The analysis of the conversion rate of the monomer to thin film material leads to important conclusions on the mechanism of glow polymer film formation.
    Notes: Durch Ausmessen der Profile der Schichtabscheidungsrate entlang der Wand durchströmter langer Entladungsrohre lassen sich deren Abhängigkeiten von den verschiedenen Parametern diskutieren. Speziell die Auswertung des Umsetzungsgrades liefert wichtige Aussagen zum Mechanismus der Glimmpolymerschichtbildung.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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