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  • 1
    Electronic Resource
    Electronic Resource
    Calorimetic study of eutectics: solid solubility limit and entropyof fusion of either phase
    Amsterdam : Elsevier
    Thermochimica Acta 29 (1979), S. 357-362 
    Details
    ISSN: 0040-6031
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0040-6031(79)87106-3
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  • 2
    Electronic Resource
    Electronic Resource
    New ternary phase in Cr-Fe-Mn alloys (1984)
    Springer
    Naturwissenschaften 71 (1984), S. 583-583 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01189185
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of water vapor on oxidation and creep behavior of incoloy 800 at temperatures between 850 and 980°C (1989)
    Springer
    Oxidation of metals 32 (1989), S. 295-316 
    Details
    ISSN: 1573-4889
    Keywords: Fe-base superalloy ; oxidation ; corrosion in water vapor ; creep rupture strength in water vapor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation kinetics and creep behavior of Incoloy 800 were studied in air and in water vapor charged with oxygen. Oxidation kinetics were determined by thermogravimetry. The creep behavior of samples tested in air and in H2O∶O2=1∶1 atmospheres was investigated by electron microscopic techniques. The oxidation rate of samples tested in air was governed by a p-conducting chromia interlayer. Depending upon water vapor pressure, chromia became n-conductive. As a consequence, a continuous rate-governing silica interlayer formed. The oxygen activity in the alloy was established by the dissociative pressure of the respective diffusion-rate-governing oxide scale. The stability of the dispersion-hardening Ti(C, N) particulates within the alloy was affected by the respective oxygen activity. In the samples tested in air, partial oxidation of the particulates due to enhanced oxygen activity caused a loss of coherency with the matrix. As a result, the deformation behavior during creep was changed to planar-slip mode, bringing about loss of creep resistance and ductility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00664803
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  • 4
    Electronic Resource
    Electronic Resource
    Basic Concepts for better heat protection systemsDedicated to Professor Dr. rer. nat. Wolfgang Bunk to his 60th Birthday (1987)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 18 (1987), S. 265-277 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Grundlegende Werkstoffkonzepte für einen verbesserten HitzeschutzDie Mechanismen des Oxidwachstums und der Oxidhaftung auf hochtemperaturbeständigen Legierungen werden besprochen. Lösungswege zur Erreichung höherer Oxidationsbeständigkeit werden herausgestellt. Die Heißgaskorrosionsbeständigkeit von Hochtemperaturlegierungen ist vermutlich abhängig von der jeweiligen Haftung der schützenden Oxide auf ihrer Unterlage. Keramische Beschichtungen auf Metallen bieten zusätzlichen Hitze- und Korrosionsschutz. Beides kann durch Anpassung der thermischen Ausdehnungskoeffizienten der Substrate an diejenigen dichter keramischer Schichten wesentlich verbessert werden.
    Notes: The mechanisms of oxide growth and adhesion on high temperature resistant alloys are discussed. Routes for achieving superior oxidation resistance are outlined. The hot corrosion resistance of high temperature alloys seems to be related to the respective oxide adhesion of the protective oxides on them. Ceramic coatings on metals offer additional heat and corrosion protection which can be markedly improved by matching the thermal expansion coefficients (TEC) of substrates to that of dense ceramic coatings.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19870180809
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  • 5
    Electronic Resource
    Electronic Resource
    Beitrag zum System Cr-Mn-Ni: Konstitution und OxidationsverhaltenHerrn Prof. Dr. rer. nat. Wolfgang Bunk zum 60. Geburtstag gewidmet (1987)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 18 (1987), S. 329-336 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The Ternary System Cr-Mn-NiThe ternary system Cr-Mn-Ni has been investigated by using DTA, dilatometry, X-ray diffraction between 25 and 800°C, optical microscopy and micro-hardness techniques. The interior (Mn, Cr)Ni-phase Θ is crystallographically redetermined. The isothermal oxidation behaviour between 700 and 900°C of high manganese alloys having 20 to 50 wt.% chromium has been evaluated. The external oxides formed are determined, their interdependence with oxidation kinetics is discussed.
    Notes: Das ternäre System Cr-Mn-Ni ist konstitutionell mit DTA, Dilatometrie, Röntgenfeinstrukturuntersuchungen zwischen Raumtemperatur und 800°C, Lichtmikroskopie und Mikrohärtemessungen bestimmt worden. Die zentrale (Mn, Cr)Ni-Phase Θ ist kristallographisch neu besprochen worden. Das Oxidationsverhalten von Legierungen hohen Mangangehaltes mit 20 bis 50 Gew% Chrom ist isotherm bei 700 bis 900°C gravimetrisch untersucht worden. Die entstandenen Oxide sind bestimmt und ihr Einfluß auf die Kinetik erläutert worden.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19870181009
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  • 6
    Electronic Resource
    Electronic Resource
    Thermocyclic Behavior of Differently Stabilized and structured EB-PVD thermal barrier coatingsDedicated to Prof. Wolfgang Bunk on the occasion of his 70th birthday (1997)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 28 (1997), S. 370-376 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Thermowechselverhalten von EB-PVD Wärmedämmschichten mit unterschiedlicher Zusammensetzung und StrukturDurch das Elektronenstrahl-Verdatnpfungsverfahren (EB-PVD) werden spezifische, kolumnare Schutzschichten auf Gasturbinen- bauteilen erzeugt. Der hauptsächliche Vorteil dieser Struktur liegt in ihrer herausragenden Beständigkeit gegen Dehnungen, Erosion und Thermoschockbelastungen, was zu einer Lebensdauerverlän- gerung führt. Der Einfluß der chemischen Zusammensetzung so- wie der Mikrostruktur auf die Lebensdauer von EB-PVD Wärme- dämmschichten auf Zirkondioxidbasis wird in einem zyklischen Heißgas- sowie in einem Thermowechselversuch untersucht. Die Möglichkeit zur Herstellung von anwendungsangepaßten Wärme- dammschichten durch Parametervariation beim EB-PVD-Verfah- ren wird aufgezeigt. Das Strukturzonendiagramm für PVD-Verfahren wird weiterentwickelt, indem der Einfluß der Substratrotation auf die Ausbildung der Mikrostruktur eingearbeitet wird. Einige grundlegende Aspekte von Einquellen- und Zweiquellenverdamp- fung werden verglichen.
    Notes: The electron-beam physical vapor deposition (EB-PVD) process provides distinctive coatings of a unique columnar microstructure for gas turbine components. Main advantage of this structure is superior tolerance against straining, erosion and thermoshock, thus giving it a major edge in lifetime. This paper outlines the interaction between chemical composition and microstructural evolution EB-PVD zirconia-based thermal barrier coatings (TBCs) and their respective lifetimes in cyclic burner rig and furnace tests. Customizing TBC microstructure by adjusting EB-PVD processing parameters is emphasized. A structural zone diagram for PVD is modified by interconnecting the influence of substrate rotation with microstructural evolutions. Finally, some basic aspects of single source and dual source evaporation are compared.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19970280811
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  • 7
    Electronic Resource
    Electronic Resource
    Predictability of Eutectic MicrostructuresDedicated to Prof. Wolfgang Bunk on the occasion of his 70th birthday (1997)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 28 (1997), S. 377-383 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zur Voraussage der Gefügefeinheit eutektischer Mikrostrukturen
    Notes: The interphase spacings σ in the microstructures of most binary and pseudobinary “normal” metallic eutectics can roughly be quan- tified with regard to their respective solidification rates v according to a general relationship \documentclass{article}\pagestyle{empty}\begin{document}$$ \lambda ^2 \cdot {\rm v} = {\rm constant} $$\end{document} constant the constant being commonly between 10-10 and 10-11 cm3 -1 The designation “normal” relates to similar degrees of undercooling of either phase on a plain-front solidification process at variance with anomaleous eutectics which solidify at different degrees of under- cooling in an uncoupled or weakly-coupled manner. The “constant”, however, is an individual value for each eutectic system. It is lowest for “simple” eutectics forming no intermetallic com- pounds and having low terminal solid solutions. The constant is raised for systems by 3 orders of magnitude or more if extensive terminal solid solutions are present. A closer fit for deliberate normal eutectics is presented in this pragmatic approach if the concentration differences between the terminal phases in eutectics ΔCE [at%] are attributed to them as a square term according to λ2 + · v · ΔCE2 = constant. The data based on this relation still show some scatter but they are grouping to distinct material families e. g. to Pb-, Ag- or Al-based eutectics. The remanent differences are estimated to disappear as soon as the relation is extended by the interdiffusion coefficient D according to \documentclass{article}\pagestyle{empty}\begin{document}$$ \lambda ^2 \cdot {\rm v} \cdot \Delta {\rm C}_{\rm E} ^2 \cdot {\rm D} \cong 1.9 \cdot 10^{ - 12} \left\{ {{\rm cm}^{\rm 5} \cdot {\rm s}^{ - {\rm 2}} \cdot {\rm at\% }} \right\} $$\end{document} as is confirmed in cases where reliable D values are available. These findings are in contrast to the current published theories on eutectic solidification. Suggestions are given where the bound- ary conditions have to be altered in order to attain full accord be- tween experiment and theory.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19970280813
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  • 8
    Electronic Resource
    Electronic Resource
    Oxidationsverhalten von gerichtet erstarrten Eutektika und deren Modellcharakter für die Schutzschichtentwicklung (1981)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 108-108 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19810120313
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  • 9
    Electronic Resource
    Electronic Resource
    Erfahrungen bei der gerichteten Erstarrung von eutektischen HT-legierungen im Labor (1981)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 106-107 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19810120310
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of a transverse thermal gradient on the microstructure of a directionally solidified 73C eutectic alloy (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. 49-57 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Einfluß eines Temperaturgradienten senkrecht zur Faserachse auf das Gefüge einer gerichtet erstarrten eutektischen 73C-LegierungDie thermische Stabilität einer gerichtet erstarrten eutektischen CoCrCAl-Legierung in einem Temperaturgradienten wird mit dem Verhalten unter isothermen Bedingungen verglichen.Zur Prüfung von gerichtet erstarrten Eutektika in hohem Temperaturgradienten und bei Temperaturen oberhalb 1300 K wurde eine Versuchseinrichtung entwickelt, die Experimente in unterschiedlicher Atmosphäre und im Vakuum ermöglicht. Die Versuche in diesem Gradienten-Ofen ergaben eine Vergröberung der Karbidfasern, die in dieser Legierung die Verstärkungsphase bilden. Durch die Umwandlung von Karbiden wird die Gefügestabilität beeinträchtigt.Diese Effekte werden in bezug auf isotherme Bedingungen diskutiert und ihre Auswirkungen auf die Anwendbarkeit dieser Legierung als Material für Hochtemperatur-Gas-Turbinen überprüft.
    Notes: The thermal stability of a directionally solidified (d. s.) eutectic CoCrCAl-alloy in a thermal gradient is compared to isothermal conditions.A device has been designed and constructed for examination of d. s. eutectics in high temperature gradients at temperatures above 1300 K in different atmospheres and vacuum.Experiments in this gradient furnace show coarsening of the carbide fibres forming the aligned strengthening phase. A microstructural instability resulting from the transformation of carbide fibres has been observed.These effects are discussed in relation to isothermal conditions and their implications on the applicability of the alloy as high temperature gas turbine blade material.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100208
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