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Abstract

This article provides an overview of key abradable thermal spray coating systems based on predominant function and key design criteria. It describes two families of coatings which have evolved for use at higher temperature: flame (combustion)-sprayed abradable powders and atmospheric plasma-sprayed abradable powders. Three classic examples of flame spray abradables are nickel-graphite powders, NiCrAl-bentonite powders, and NiCrFeAl-boron nitride powders. The article provides information on various abradable coating testing procedures, namely, abradable incursion testing; aging, corrosion, thermal cycle and thermal shock testing; hardness testing; and erosion resistance testing.

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Scott Wilson, Abradable Thermal Spray Applications and Technology, Thermal Spray Technology, Vol 5A, ASM Handbook, Edited By Robert C. Tucker, Jr., ASM International, 2013, p 287–295, https://doi.org/10.31399/asm.hb.v05a.a0005738

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