Lanthanumphosphate is recommended as an effective barrier against molten uraniumand its alloys. LaPO4 has a
highmelting point, is inert towards reactivemetals and has lowthermal conductivity,whichmake it an ideal candidate
for corrosion barrier coatings in molten metal environment. Studies on plasma deposition of lanthanum
phosphate, its characterization and interaction with molten uranium are reported in this paper. Lanthanum
phosphate was synthesized by chemical route and the as-synthesized powder was converted to free flowing
powder for plasma spray deposition. Lanthanumphosphate coatings were prepared on stainless steel substrates
and the deposits were characterized for phase composition using X-ray diffraction (XRD), Raman spectroscopy
and Fourier transformed infrared spectroscopy (FTIR). Results showed that the coatings retained the monazite
structure of LaPO4 precursor powder. Microstructure of the coatings and interface by scanning electron microscope
(SEM) revealed good bonding between the phosphate layer and substrate. Porosity of the coatingswas observed
to decreasewith the increase in deposition power from10kWto 20kW. Adhesion strength of the coatings
was found to increase with deposition power. Corrosion studies of coated LaPO4 in molten uraniumshowed that
lanthanum phosphate does not chemically react with molten uranium and LaPO4 coating offers adequate resistance
to the substrate against corrosion attack by molten uranium