Protective coatings

Neil Birks; Gerald H. Meier; Frederick S. Pettit

doi:10.1017/CBO9781139163903.012

10 - Protective coatings

Published online by Cambridge University Press: 05 June 2012

Neil Birks ,

Gerald H. Meier and

Frederick S. Pettit

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Gerald H. Meier: Affiliation:
University of Pittsburgh
Frederick S. Pettit: Affiliation:
University of Pittsburgh

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Summary

Introduction

Coatings have been used for centuries for embellishment or for protection of a substrate that is adequate in all other ways, usually providing shape, stiffness, or strength. The greatest use of coatings has been at room temperature by the jewellry industry for appearance, for ceramics by enamelling to improve appearance and provide impermeability, and by the automobile industry for corrosion protection. In these cases, a very high degree of success has been achieved.

In the use of coatings at high temperatures, the aim is either to protect the surface of an inexpensive, but degradable material, as in the use of coextruded tubing for heat exchangers, or to protect the surface of an alloy that has been developed for strength but does not have sufficient intrinsic resistance to high-temperature corrosion. Typical applications consist of power generation using steam boilers, which are usually fired by fossil fuel; and in gas turbines, which are used for aircraft or marine propulsion, or are land based for power generation. In recent years, the use of ceramic coatings as insulators, thermal-barrier coatings, has also become important for limiting the degradation of alloys, particularly in gas turbines. The various types of coatings are described extensively in ref.1.

This chapter is organized to give an overview of the fabrication, use, and degradation of the various types of coatings that are available for use in high-temperature systems.

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Type: Chapter
Information: Introduction to the High Temperature Oxidation of Metals , pp. 271 - 305

DOI: https://doi.org/10.1017/CBO9781139163903.012 [Opens in a new window]

Publisher: Cambridge University Press

Print publication year: 2006

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