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  • 1
    Electronic Resource
    Electronic Resource
    Untersuchung von Oberflächenschutzschichten von Gasturbinenlegierungen (1972)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 3 (1972), S. 193-197 
    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: Investigations on protective coatings on gasturbine alloys. It has been found by investigations of specimens of a combustion chamber pilot plant and also by experiences with gasturbines that aluminide or chromium aluminide coatings are only slightly protective under working conditions of industrial gasturbines. Chromium coatings have a distinctive better protective efficacy and are surpassed in this quality by silicide coatings. It was possible to give information on the development of silicide phases on Nimonic 105. Under the conditions of corrosive attack a surface layer of Nickelolivine is formed and the silicide phases are changed in direction of ternary phases. Even when chromium sulfides are formed in the silicide layer the specimens are stable under the test conditions. By investigations on an airfoil made from B 1900 with a protective coating of Aluminium and Silicon the presence is shown of a ternary Laves phase with Silicon.
    Notes: Untersuchungen von Proben der Brennkammer Pilotanlage wie praktische Erfahrungen in Gasturbinen zeigen, daß Aluminid- und Chromaluminidschichten unter den Betriebsbedingungen industrieller Gasturbinen nur eine schwache Schutzwirkung auf Schaufeln ausüben. Chromüberzüge haben eine bessere Wirkung und werden darin von Silicidschichten noch übertroffen. Es Konnten Angaben über die Ausbildung von Phasen in Nimonic 105 mit Silicidüberzügen gemacht werden. Unter den Bedingungen korrosiven Angriffs entsteht eine Deckschicht aus Nickelorthosilikat und die Silicidphasen ändern sich in Richtung ternärer Phasen. Obzwar sich Chromsulfide in der Silicidschicht bilden, erwiesen sich die Proben unter den als stabil. Untersuchungen an einer Flugturbinenschaufel aus B 1900 mit Aluminium- und Siliciumbeschichtung zeigten die Anwesenheit einer ternären Lavesphase mit Silicium.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19720030406
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  • 2
    Electronic Resource
    Electronic Resource
    CVD-Silizium als Korrosionsschutz für die Beschaufelung von stationären Gasturbinen (1972)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 23 (1972), S. 627-636 
    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: Chemical Vapor Deposited silicon as a corrosion protection for the blades of stationary gas turbinesIn order to improve the corrosion resistance of heat resistant nickel alloys used as the blade materials for stationary gas turbines these materials were given a silicon coating by a chemical vapour deposition process. With the aid of microprobe and X-ray investigations the silicides formed were investigated.Coated specimens were exposed to a series of tests specifically oriented toward the intended use in stationary gas turbines. It turned out, that the silicide coatings on nickel base alloys are exceptionally stable to high temperature corrosion, so that a considerable increase of the useful life of silicided gas turbine blades may be expected.
    Notes: Zur Erhöhung der Korrosionsbeständigkeit von hochwarmfesten Nickellegierungen, die als Schaufelmaterialien für stationäre Gasturbinen Verwendung finden, wurden diese Materialien nach einem CVD-Verfahren (Chemical Vapor Deposition) mit Silizium beschichtet. Mit Hilfe von Mikrosonden- und Röntgenuntersuchungen wurden die gebildeten Silizide identifiziert.Beschichtete Proben wurden einer Reihe von spezifisch auf den Einsatz in stationären Gasturbinen ausgerichteten Prüfverfahren ausgesetzt. Dabei zeigte sich, daß Silizidschichten auf Nickellegierungen außerordentlich beständig gegen Hochtemperaturkorrosion sind und eine wesentliche Erhöhung der Standzeiten von silizierten Gasturbinenschaufeln erwarten lassen.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19720230802
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  • 3
    Electronic Resource
    Electronic Resource
    Thermal conductivity of poly(ether ether ketone) and its short-fiber composites (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 32 (1994), S. 1389-1397 
    Details
    ISSN: 0887-6266
    Keywords: thermal conductivity ; poly (ether ether ketone) ; short-fiber composites ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The effects of crystallinity, orientation, and short-fiber filler on the thermal diffusivity D and thermal conductivity K of poly (ether ether ketone) (PEEK) have been studied. Below the glass transition, D increases by less than 10% as the crystallinity increases from 0 to 0.3. For amorphous PEEK, there is an abrupt drop in D at the glass transition (Tg ⋍ 420 K). The drop is less prominent for the 30% crystalline sample and occurs at 20 K higher. At a draw ratio of 2.5, the axial thermal conductivity is 2.3 times higher while the transverse thermal conductivity is 30% lower than that of the unoriented material. For an injection-molded bar of carbon fiber reinforced PEEK, the variation of D with position along the width or thickness direction is found to correlate well with the fiber orientation. By regarding the injection-molded bar as a multidirectional laminate comprising a large number of unidirectional plies, the thermal conductivities along the longitudinal and transverse direction are calculated and found to agree closely with the experimental data. © 1994 John Wiley & Sons, Inc.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1994.090320810
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    Paper (German National Licenses)
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