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  • 1
    Electronic Resource
    Electronic Resource
    Surface protection of a chromia forming alloy at 1300°C (1990)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 41 (1990), S. 657-658 
    Details
    ISSN: 0947-5117
    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
    Notes: Oberflächenschutz einer chromoxidbildenden Legierung bei 1300°C
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19900411203
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Points to be considered in thermogravimetry (1993)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 44 (1993), S. 345-350 
    Details
    ISSN: 0947-5117
    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: Bei der Thermogravimetrie zu berücksichtigende HinweiseKontinuierliche Thermogravimetrie ist eine verbreitete Methode, um Werkstoffe in korrosiven Gasen bei hohen Temperaturen zu prüfen und um Kinetik und Mechanismen der Hochtemperaturkorrosion aufzuklären. Hier werden Empfehlungen zur Durchführung thermogravimetrischer Tests zusammengestellt, Hinweise gegeben betreffend Probengröße und -form, Oberflächenpräparation, Reaktionsrohr, Start des Experiments, besonders empfindliche Messungen und Gasströmung und -regelung. Die Veröffentlichung ist als Grundlage und Startpunkt für zu entwickelnde Richtlinien für die Hochtemperaturkorrosionsforschung gedacht.
    Notes: Continuous thermogravimetry is a common method to test materials in gaseous corrosive environments at high temperatures and to elucidate kinetics and mechanisms of high temperature corrosion. Recommendations how to conduct thermogravimetric tests are collected here, points to be considered including sample size and form, surface preparation, reaction chamber, starting procedure, sensitive measurements, gas supply and dosing. This study is meant as a starting foundation for establishing guidelines in high temperature corrosion research.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19930440805
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  • 3
    Electronic Resource
    Electronic Resource
    An investigation of the high temperature oxidation of a 20% Cr/25% Ni/Nb stainless steel in carbon dioxide using thin layer activationDedicated to Professor Dr. Alfred Rahmel on the occasion of his 60th birthday (1987)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 38 (1987), S. 506-516 
    Details
    ISSN: 0947-5117
    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: Untersuchung der Hochtemperaturoxidation eines nichtrostenden Stahls (25% Ni/20% Cr/Nb) in Kohlendioxid mit Hilfe der DünnschichtaktivierungDas Verhalten eines nichtrostenden Stahls (25% Ni/20% Cr/Nb) bei der Hochtemperaturkorrosion unter isothermen Bedingungen (Versuchsdauer bis 525 h) in Kohlendioxid bei 900 und 950°C und anschließendem Abkühlen im Ofen wurde gravimetrisch und zusätzlich mittels Dünnschichtaktivierung untersucht. Dazu wurde ein definierter Bereich der Stahloberfläche durch einen Deuteronenstrahl aktiviert, um die Radioisotopen 51Cr, 52Mn, 56Mn, 56Co, 57Co und 58Co zu erzeugen; die Tiefenverteilungen reichten unabhängig voneinander bis 70 μm. Die Messungen der Aktivitätsniveaus der Radioisotopen vor, während und nach der Oxidation sowie unter Berücksichtigung von abgeplatztem Zunder ermöglichen eine Differenzierung der durch Rißbildung im Zunder hervorgerufenen Effekte auf die Oxidationskinetik. Dabei wurde die Beteiligung der einzelnen Radioisotopen in den entstandenen Zundern und den abgeplatzten Zunderteilchen bestimmt.
    Notes: The high temperature oxidation behaviour of a 20% Cr/25% Ni/Nb stainless steel, during isothermal exposures of up to 525 h duration, in carbon dioxide, at 900 and 950°C and on subsequent furnace cooling, has been studied by weight change measurements, in combination with thin layer activation. For this purpose a defined region of the steel was activated by a deuteron beam to produce the radioisotopes 51Cr, 52Mn, 54Mn, 56Co, 57Co and 58Co, with independent depth distributions to 70 μm. Measurements of the activity levels of the radioisotopes before, during and after oxidation, monitored scale spallation, thus enabling effects on the oxidation kinetics due to scale cracking to be distinguished. The involvement of each radioisotope was ascertained in the types of scales formed and in the spall produced.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19870380908
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  • 4
    Electronic Resource
    Electronic Resource
    Protection of titanium aluminides by FeCrAlY Coatings (1997)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 48 (1997), S. 48-55 
    Details
    ISSN: 0947-5117
    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: Schutz von Titanaluminiden durch FeCrAlY BeschichtungenUntersucht wurde die Wirksamkeit von Fe+15%Cr+5%Al+0.3%Y-Beschichtungen, hergestellt mittels Sprühionenplattieren, hinsichtlich der Verbesserung des Oxidationsverhaltens von γ-2 Ti3Al bei 800°C und γ-TiAl bei 900 und 1000°C während zyklischer Auslagerung in Luft bis zu 1000 Stunden. Die 45-135 μm Beschichtungen wurden sowohl im Originalzustand als auch nach Verdichtung mittels Strahlen getestet. Die Kinetik des Angriffes und des Abplatzens wurde gravimetrisch verfolgt. Die Bestimmung der Zusammensetzung der Reaktionsprodukte erfolgte mit verschiedenen oberflächenanalytischen Verfahren.Der Oxidationsschutz wurde durch die Bildung eines γ-Al2O3-Oxidzunders auf der Beschichtungsoberfläche erreicht. Chemische Reaktionen an der Beschichtung-Substrat-Grenzfläche mit damit verbundener Hohlstellenbildung können aber dazu führen, daß die Beschichtung mechanisch versagt. Um dieses Problem zu überwinden, wurden verschiedene, auf der gleichen Beschichtungslinie erzeugte und als Diffusionsbarrieren zwischen der FeCrAlY Beschichtung und dem Ti3Al-Substrat wirkende keramische Zwischenschichten in 1000 Stunden dauernden Oxidationsversuchen bei 800°C untersucht.
    Notes: The effectiveness of Fe+15%Cr+5%Al+0.3%Y coatings. produced by sputter ion plating, in improving the oxidation behaviour of γ-2 Ti3Al at 800°C and γ-TiAl at 900° and 1000°C. during cyclic exposures in air of up to 1000 hours duration, has been studied. The 45-135 μm coatings were tested in both the as-coated condition and following densification by peening. The kinetics of attack and of spallation were followed gravimetrically, while the reaction product compositions were examined by a range of surface analytical techniques.Oxidation protection was afforded by the formation on the coating surface of a γ-Al2O3 oxide scale but chemical reactions at the coating-substrate interface with accompanying voidage development, eventually caused the coating to fail mechanically. To surmount this problem the potential of several ceramic interlayers produced by the same coating route, and interposed as diffusion barriers between the FeCrAlY overlayers and the Ti3Al substrate was examined in 1000 hour oxidation tests at 800°C.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19970480109
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    High temperature corrosion characterization by the combined use of surface microsurgery and surface analysis (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 22 (1994), S. 421-430 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Characterization of both the chemical and physical nature of interactions at interfaces is crucial to mechanistic understanding of the behaviour of metallic and ceramic materials, including coatings, in aggressive environments at high temperatures. This can be achieved post exposure by the use of defined surface analytical techniques but is reliant upon the deployment of appropriate surface microsurgery procedures, such as metallography, fractography, taper section polishing, selective etching, complete dissolution, etc., for the preparation of surfaces prior to analysis. Recent studies undertaken at the Harwell Laboratory on the combined use of surface microsurgery and surface analysis in the characterization of high temperature corrosion attack are reviewed. These have aimed to improve the precision and the effectiveness of surface microsurgery procedures to ensure the optimum exploitation of the capabilities of surface analytical techniques, especially those in more common usage, such as scanning electron microscopy, electron probe microanalysis, laser Raman spectroscopy, secondary ion mass spectrometry, etc. Although most of the examples presented are of thick (〉 1 μm) corrosion scales and of internal attack, several of the surface microsurgery procedures have relevance to the analysis of sub-micron layers.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740220191
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The use of SIMS with a microfocused ion beam to study thick corrosion scales (1986)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 9 (1986), S. 388-388 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740090612
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    Paper (German National Licenses)
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