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Four series, eleven different component Nb-Ti-Si-Cr-Al-X alloys have been exposed in air at temperatures ranging from 1200oF (~648oC) to 1800oF (~982oC) for various time durations. The sequences of reactions that occur upon oxidizing these alloys have been systematically studied. The oxidation of the samples has been monitored by weight gain technique and measuring thickness of the oxide film and the characterization of the oxide layer as well of base materials was carried out using scanning electron microscopy (SEM), x-ray diffractometery (XRD) and x-ray photon spectroscopy (XPS). The morphology of the oxide layer, formation of various oxides and the ingress of oxygen into the base materials have been studied as a function of time and temperature. The role of different alloying elements in the formation of the oxide layer has been examined and a possible mechanism of the oxidation has been proposed. The results have established the following.
This handbook provides researchers and development engineers with essential information on intermetallics for high temperature applications. The information will enable users to make choices by considering cost, properties, and performance for long-term use at elevated temperatures and in other adverse environmental conditions. It provides an overview of processing, structural and mechanical properties, applications, behavior and endurance at high temperature and in oxidizing conditions. It also focuses on 'pesting' disintegration, corrosion and oxidation phenomena at intermediate temperatures, corrosion embrittlement at ambient temperatures, aqueous corrosion and corrosion sensitive embrittlement properties.
The papers included in this issue of ECS Transactions were originally presented in the symposium ¿High Temperature Corrosion and Materials Chemistry 7¿, held during the PRiME 2008 joint international meeting of The Electrochemical Society and The Electrochemical Society of Japan, with the technical cosponsorship of the Japan Society of Applied Physics, the Korean Electrochemical Society, the Electrochemistry Division of the Royal Australian Chemical Institute, and the Chinese Society of Electrochemistry. This meeting was held in Honolulu, Hawaii, from October 12 to 17, 2008.
This book deals with the fundamental description of the thermodynamics and kinetics of high temperature oxidation of sulphidation of metals and intermetallic compounds. It is a comprehensive account of a large amount of new work in the field including modelling, analysis and a range of experimental methods. The text deals with both basic materials, and some current high temperature structural materials.