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Metallographic examination is a critical step in the assessment of thermal spray coating characteristics. This article discusses the major steps involved in metallographic examination: sectioning, mounting, grinding, polishing, optical microscopy, and image analysis. It provides a discussion on etching to reveal grain structure. The article also provides recommendations for metallographic examination of some standard coatings.

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Walter Riggs, Dana Rucker, Metallography and Image Analysis, Thermal Spray Technology, Vol 5A, ASM Handbook, Edited By Robert C. Tucker, Jr., ASM International, 2013, p 188–213,

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