Corrosion of lanthanum magnesium hexaaluminate as plasma-sprayed coating and as bulk material when exposed to molten V2O5-containing salt

Hot corrosion behavior of solution precursor and atmospheric plasma sprayed thermal barrier coatings

“…This leaching out of yttria destabilizes YSZ and accentuates failure of TBCs. Molten salts (especially chlorides) lead to the formation of voluminous non-protective oxides on the bond coat surface resulting in failure of TBCs by delamination at the bond coat/top coat interface [4,5,[16][17][18][19][20][26][27].…”

“…Hot corrosion of TBCs and superalloy base materials is a widely studied topic [16][17][18][19][20][21][22][23][24][25]. Hot corrosion in TBCs refers to the degradation by molten salt deposits (V 2 O 5 or NaVO 3 ) that react with yttria to form YVO 4 .…”

Hot Corrosion Behavior of BaLa2Ti3O10 Thermal Barrier Ceramics in V2O5 and Na2SO4 + V2O5 Molten Salts

“…The rationale behind this is the formation of a dense layer on the sample surface resulting from the reaction between BaLa 2 Ti 3 O 10 and the molten salts. The reaction could be understood in terms of the breakdown of the chemical bonds in the crystal by molten salts attack [17,31]. From the viewpoint of crystallography, BaLa 2 Ti 3 O 10 crystal could be seen as a tri-perovskite [La 2 Ti 3 O 10 ] layer separated by a Ba layer along c-axis [30].…”

High-temperature corrosion behavior of zirconia ceramic in molten Na2SO4+NaVO3 salt mixture

“…Nowadays, 6-8 wt% (3.5-4.5 mol%) yttria partially stabilized zirconia (YSZ) is the state-of-art ceramic top coat material for TBCs applications due to its high melting point, low thermal conductivity, high temperature stability in oxidizing and combustion atmospheres, comparative thermal expansion coefficient with the superalloy substrate etc. [5,6].…”