Investigation on the thermo-chemical reaction mechanism between yttria-stabilized zirconia (YSZ) and calcium--magnesium--alumino-silicate (CMAS)

doi:10.1007/s11706-015-0275-y

Front. Mater. Sci.

2015, Vol. 9

Issue (1) : 93-100 https://doi.org/10.1007/s11706-015-0275-y

RESEARCH ARTICLE

Investigation on the thermo-chemical reaction mechanism between yttria-stabilized zirconia (YSZ) and calcium--magnesium--alumino-silicate (CMAS)

Dong-Bo ZHANG(

),Bin-Yi WANG,Jian CAO,Guan-Yu SONG,Juan-Bo LIU

Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing 102206, China

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Abstract

Thermal barrier coatings (TBCs) with Y₂O₃-stabilized ZrO₂ (YSZ) top coat play a very important role in advanced turbine blades by considerably increasing the engine efficiency and improving the performance of highly loaded blades. However, at high temperatures, environment factors result in the failure of TBCs. The influence of calcium--magnesium--alumino-silicate (CMAS) is one of environment factors. Although thermo-physical effect is being paid attention to, the thermo-chemical reaction becomes the hot-spot in the research area of TBCs affected by CMAS. In this paper, traditional two-layered structured TBCs were prepared by electron beam physical vapor deposition (EB-PVD) as the object of study. TBCs coated with CMAS were heated at 1240°C for 3 h. Additionally, 15 wt.% simulated molten CMAS powder and YSZ powder were mixed and heated at 1240°C or 1350°C for 48 h. SEM and EDS were adopted to detect morphology and elements distribution. According to XRD and TEM results, it was revealed that CMAS react with YSZ at high temperature and form ZrSiO₄, Ca_0.2Zr_0.8O_1.8 and Ca_0.15Zr_0.85O_1.85 after reaction, as a result, leading to the failure of TBCs and decreasing the TBC lifetime.

Keywords thermal barrier coating (TBC) yttria-stabilized zirconia (YSZ) calcium--magnesium--alumino-silicate (CMAS) thermo-chemical reaction high temperature

Corresponding Author(s): Dong-Bo ZHANG

Online First Date: 21 January 2015 Issue Date: 02 March 2015

Cite this article:

Dong-Bo ZHANG,Bin-Yi WANG,Jian CAO, et al. Investigation on the thermo-chemical reaction mechanism between yttria-stabilized zirconia (YSZ) and calcium--magnesium--alumino-silicate (CMAS)[J]. Front. Mater. Sci., 2015, 9(1): 93-100.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-015-0275-y
https://academic.hep.com.cn/foms/EN/Y2015/V9/I1/93

Fig.1 Morphology of TBCs after annealing at 1240°C for 3 h: (a) TBC surface coated with CMAS powders; (b) TBC surface without CMAS coating.

Fig.2 Cross-section morphology of CMAS-coated TBCs after annealing at 1240°C for 3 h: (a) details by macroscope magnification; (b) general view.

Fig.3 XRD patterns of mixed YSZ and CMAS after annealing at 1240°C for 48 h.

Fig.4 XRD patterns of mixed YSZ and CMAS after annealing at 1350°C for 48 h.

Fig.5 The surface morphology of the YSZ pellet brushed with CMAS after annealing at 1240°C for 48 h.

Fig.6 Cross-section morphology of the YSZ pellet coated by CMAS: (a) general view; (b) details by macroscope magnification.

Fig.7 Cross-section morphology of the YSZ pellet coated by CMAS after annealing at 1240°C for 48 h and the composition distribution.

Tab.1 Composition distribution in CMAS and YSZ substrate

Fig.8 Cross-section morphology of mixed CMAS and YSZ after annealing at 1240°C for 48 h.

Tab.2 Composition distribution in mixed CMAS and YSZ

Fig.9 (a) TEM morphology and (b) TEM diffraction spot of mixed YSZ and CMAS.

Tab.1

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