Zunderfeste Legierungen

Pfeiffer, Harald P.; Thomas, Hans

doi:10.1007/978-3-642-88740-6

Cited by 56 publications

(11 citation statements)

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“…On the other hand Hauffe and Rahmel (3), as well as Pfeiffer (4), stated that if the reaction was carried out in sulfur vapor at 630 ~ under a pressure not exceeding 1 mm Hg the course of the reaction could be described with a linear rate law.…”

Section: Dravnieks (1) and Wagner And Lichtermentioning

confidence: 99%

Kinetics and Mechanism of Nickel-Sulfur Reaction

Czerski

Mrowec

Werber

1962

J. Electrochem. Soc.

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Kinetics and mechanism of the reaction between nickel and sulfur vapors were investigated in the temperature range 480~176 under atmospheric pressure. The sulfurization of nickel has been found to follow, under these conditions, the parabolic rate law. The activation energy of this process amounts to 22 kcal/mole. The examination of x-ray patterns of the scale formed on the surface of the metal has demonstrated that this scale layer is composed almost entirely of NiS. Morphologic investigations show that the scale is composed of two distinct layers. The outer layer, constituting the main part of the whole scale, is compact, polycrystalline, and exhibits an ordered growth texture. The inner layer is porous and does not exhibit any growth texture. The investigations carried out with the aid of the radioactive sulfur isotope *~S have demonstrated that the sulfide scale on nickel is formed exclusively by the outward diffusion of the metal.The confrontation of experimental data with the results obtained by Dravnieks (1) leads to the assumption that the mechanism of the sulfide scale formation on nickel does not depend on the state of aggregation of the oxidizing medium. (2) have demonstrated that the sulfurization of nickel in molten sulfur in the temperature range 205o-445 ~ follows the parabolic rate law. On the other hand Hauffe and Rahmel (3), as well as Pfeiffer (4), stated that if the reaction was carried out in sulfur vapor at 630 ~ under a pressure not exceeding 1 mm Hg the course of the reaction could be described with a linear rate law. Dravnieks (1) and Wagner and Lichter

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Section: Dravnieks (1) and Wagner And Lichtermentioning

confidence: 99%

Kinetics and Mechanism of Nickel-Sulfur Reaction

Czerski

Mrowec

Werber

1962

J. Electrochem. Soc.

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“…Firstly the fabricability of Fe-Cr-Al alloys decreases with increasing aluminium concentration due to the formation of ordered phases and other microstructural changes [2,9]. Furthermore aluminium does not necessarily increase the ªTime to Breakawayº.…”

Section: Introductionmentioning

confidence: 97%

“…It is known from many studies that reactive elements like Y, Hf, Ce, La etc. increase the scale adherence and thus prevent the spalling of protective oxide scales [2,10,11]. Several mechanisms have been suggested which account for the scale adherence.…”

Section: Introductionmentioning

confidence: 99%

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Factors affecting the oxidation behaviour of thin Fe-Cr-Al foils. Part II: The effect of alloying elements: Overdoping

Klöwer¹

2000

Materials and Corrosion

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“…Pfeiffer und G. Sommer (12) fur FeCrAl-Heizleiterlegierungen erbracht, indem sie die Dimensionsabhangigkeit der Lebensdauer bei diesen Legierungen untersuchten. Dabei zeigte sich nur bis zu einer bestimmen Dimension das in Analogie zu den NiCr-Heizleitern zu erwartende lineare Ansteigen der Lebensdauer mit dem Drahtdurchmesser.…”

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Der Einfluß von Zusatzelementen auf die Zunderfestigkeit von Heizleiterlegierungen

Hillinger

1971

Materials & Corrosion

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Der Einfluß von Spurenelementen auf die Lebensdauer von Heizleitern, der vor fast 40 Jahren von W. Hessenbruch zuerst erkannt und systematisch untersucht wurde, wird besprochen. Aus den Hessenbruch'schen Arbeiten ist bekannt, daß besonders Cer und Kalzium die Zunderfestigkeit von Heizleitern erhöhen. Auf metallurgische Probleme des Zulegierens dieser hochreaktiven Elemente wird kurz eingegangen. Obwohl die Lebensdauerverbesserung durch Zusatzelemente allgemein bekannt ist und in großem Umfang technisch genutzt wird, steht eine endgültige Klärung der Wirkungsweise jener verbessernden Zusätze bis heute aus. Schon bei der Frage, in welcher Form — metallisch oder oxidisch — die Zusatzelemente wirken, gehen die Ansichten auseinander. Die dazu vertretenen Meinungen werden diskutiert. Eine neue Versuchsmethodik erlaubte es, diese Frage eindeutig im Sinne der Wirksamkeit von metallisch gelösten Elementen zu beantworten.

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Zunderfeste Legierungen

Cited by 56 publications

References 0 publications

Kinetics and Mechanism of Nickel-Sulfur Reaction

Kinetics and Mechanism of Nickel-Sulfur Reaction

Factors affecting the oxidation behaviour of thin Fe-Cr-Al foils. Part II: The effect of alloying elements: Overdoping

Der Einfluß von Zusatzelementen auf die Zunderfestigkeit von Heizleiterlegierungen

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