TY - JOUR
T1 - Heat insulating capacity of Sm2Zr2O7 coating added with high absorptivity solids
AU - Wang, D. Y.
AU - Liu, L.
AU - Liu, Y. B.
AU - Li, T.
AU - Ma, Z.
AU - Wu, H. X.
N1 - Publisher Copyright:
© 2016 Elsevier Ltd and Techna Group S.r.l.
PY - 2017/2/1
Y1 - 2017/2/1
N2 - Rare earth zirconates has the potential to be a new generation of ceramic top coat material in thermal barrier coatings (TBCs). However, the heat insulating capacity of rare earth zirconates will weaken with the temperature rising because of infrared radiation. In order to evaluate the shielding effect of the coatings for infrared radiation, single layer coatings (SLC), double layer coatings (DLC) and triple layer coatings (TLC) with pure Sm2Zr2O7 (SZO) layer and Sm2Zr2O7–15 vol%NiCr2O4 (SZO-15%NCO) layer were deposited by atmospheric plasma spraying (APS). The phase, microstructure and heat insulating capacity of the coatings were investigated. The results show that the powders and coatings are only composed of spinel-type and pyrochlore type SZO. The coatings are in a well compact state. The SLC has the lowset ΔT (213 ℃), while the highest ΔT (225 ℃) is obtained in TLC. Due to high absorptivity and conductivity of NCO, both positive and negative effects on heat insulating capacity generate in the SZO-15vol%NCO layer. The DLC shows a slightly higher ΔT (216 ℃), which is 3 ℃ higher than that in SLC. Compared with SLC and DLC, ΔT in TLC increases by 12 ℃ and 9 ℃, respectively. It indicates that suitable arrangement of heat insulation layer and absorption layer can effectively obstruct radiation, which can improve effectively the insulating capacity of the coatings.
AB - Rare earth zirconates has the potential to be a new generation of ceramic top coat material in thermal barrier coatings (TBCs). However, the heat insulating capacity of rare earth zirconates will weaken with the temperature rising because of infrared radiation. In order to evaluate the shielding effect of the coatings for infrared radiation, single layer coatings (SLC), double layer coatings (DLC) and triple layer coatings (TLC) with pure Sm2Zr2O7 (SZO) layer and Sm2Zr2O7–15 vol%NiCr2O4 (SZO-15%NCO) layer were deposited by atmospheric plasma spraying (APS). The phase, microstructure and heat insulating capacity of the coatings were investigated. The results show that the powders and coatings are only composed of spinel-type and pyrochlore type SZO. The coatings are in a well compact state. The SLC has the lowset ΔT (213 ℃), while the highest ΔT (225 ℃) is obtained in TLC. Due to high absorptivity and conductivity of NCO, both positive and negative effects on heat insulating capacity generate in the SZO-15vol%NCO layer. The DLC shows a slightly higher ΔT (216 ℃), which is 3 ℃ higher than that in SLC. Compared with SLC and DLC, ΔT in TLC increases by 12 ℃ and 9 ℃, respectively. It indicates that suitable arrangement of heat insulation layer and absorption layer can effectively obstruct radiation, which can improve effectively the insulating capacity of the coatings.
KW - Atmospheric plasma spraying
KW - Heat insulating capacity
KW - High absorptivity
KW - Radiation
KW - Rare earth zirconates
UR - http://www.scopus.com/inward/record.url?scp=85006455417&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2016.11.068
DO - 10.1016/j.ceramint.2016.11.068
M3 - Article
AN - SCOPUS:85006455417
SN - 0272-8842
VL - 43
SP - 2884
EP - 2887
JO - Ceramics International
JF - Ceramics International
IS - 2
ER -