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51313-02850-Compositional Factors Affecting High-Temp. Degradation Behavior of Alloys Exposed to Relatively High PS2 - Low PO2

Product Number: 51313-02850-SG
ISBN: 02850 2013 CP
Author: Brian Gleeson
Publication Date: 2013
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The sulfidation rates of most metals and alloys are generally orders of magnitude higher than their oxidation rates depending on temperature (i.e. the activation energies are different). As a result the maximum temperature for long-term service of metallic materials exposed to high-PS2/low-PO2 environments such as those associated with low-NOx compostion systems is generally considered to be about 600?C (much lower than for oxidizing environments). However as will be shown in this presentation the sulfidation of a given alloy is critically dependent on amounts of Cr and base-metal constituents – Fe Ni and Co. The relative proportions of base-metal constituent greatly affect the duration to breakaway attack and the nature of the reaction product formed.

The sulfidation rates of most metals and alloys are generally orders of magnitude higher than their oxidation rates depending on temperature (i.e. the activation energies are different). As a result the maximum temperature for long-term service of metallic materials exposed to high-PS2/low-PO2 environments such as those associated with low-NOx compostion systems is generally considered to be about 600?C (much lower than for oxidizing environments). However as will be shown in this presentation the sulfidation of a given alloy is critically dependent on amounts of Cr and base-metal constituents – Fe Ni and Co. The relative proportions of base-metal constituent greatly affect the duration to breakaway attack and the nature of the reaction product formed.

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