Investigating Atmospheric Pressure Plasma Spray Coating of YPO4 and its Performance as a Corrosion Barrier Protective Layer Against Molten Uranium.

Autor: Bhandari, S., Chakravarthy, Y., Misra, V. C., Tiwari, N., Lenka, R. K., Patro, P. K., Kaity, S., Satpati, S. K., Mahata, T., Ghorui, S.
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Zdroj: Journal of Thermal Spray Technology; Jun2022, Vol. 31 Issue 5, p1568-1580, 13p
Abstrakt: YPO4 qualifies as a strongly effective environmental barrier coating material against highly aggressive corrosive environments like molten uranium due to its remarkable phase stability, physical and chemical compatibility, high melting point, inertness to reactive metals, low thermal conductivity and closely matching thermal expansion coefficient. Non-availability of a suitable synthesis route and rare commercial availability of phase pure spray grade YPO4 powder restricted development of relevant atmospheric plasma spray (APS) coating. The study addresses the problem first by establishing an effective synthesis route for spray grade granulated YPO4, followed by the development of APS coating, its detailed characterization and testing compatibility of the coating with molten Uranium. Yttrium nitrate is reacted with ortho-phosphoric acid under appropriate PH control to obtain spray grade granules through powder compaction, sintering, crushing, and sieving. Chemical and phase purity are established through XRD, FTIR and Raman spectroscopy. Development of thick thermal spray coating of YPO4 on graphite and molybdenum substrates and a thorough characterization of the developed coatings in terms of XRD, Raman spectroscopy, FTIR, SEM, EDX, adhesion strength, thermal expansion coefficient, and interface microstructure have been reported. Physical and chemical compatibility between YPO4 and graphite and that between the coating and molten uranium have been explored. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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