Environmental Barrier Coatings and Methods of Deposition Thereof
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United States of America Patent
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Jul 6, 2017
app pub date -
Dec 31, 2015
filing date -
Dec 31, 2015
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Abstract
Methods of making an environmental barrier coating (EBC) for a substrate are provided that include providing an EBC feedstock comprising a rare earth element composition, in which a portion of the composition produces a volatile species during an air plasma spray coating process, providing a first additive that comprises or produces the volatile species during the air plasma spray coating process, injecting the EBC feedstock into a plasma spray plume during the air plasma spray coating process; and injecting the first additive into at least one of the plasma spray plume and a plasma torch nozzle during the air plasma spray coating process, in which the EBC has a composition that is substantially similar to the composition of the EBC feedstock. Also provided are processes for air plasma spray coating an EBC onto a substrate.
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