Mechanisms of La2Ce2O7/YSZ Double-Ceramic-Layer Thermal Barrier Coatings against Volcanic Ash Corrosion

被引：0
作者：
Xia, Jie [1 ]
Du, Xuelin [1 ]
Xiao, Yiqi [2 ]
Zhang, Ling [3 ]
Wu, Rudder Tse [4 ]
Matsushita, Yoshitaka [5 ]
机构：
[1] Hunan Inst Technol, Dept Mech Engn, Hengyang 421002, Peoples R China
[2] Hunan Inst Engn, Dept Mech Engn, Xiangtan 411104, Peoples R China
[3] Chongqing Univ, Coll Mat Sci & Engn, Int Joint Lab Light Alloys MOE, Chongqing 400044, Peoples R China
[4] Natl Inst Mat Sci, High Temp Mat Grp, 1 2 1 Sengen, Tsukuba, Ibaraki 3050044, Japan
[5] Natl Inst Mat Sci, Chem Anal & Xray Diffract Grp, 1 2 1 Sengen, Tsukuba, Ibaraki 3050044, Japan
来源：
COATINGS | 2024年 / 14卷 / 07期
关键词：
thermal barrier coating; calcium-magnesium-alumina-silicate (CMAS); volcanic ash; La2Ce2O7; high-temperature corrosion; corrosion mechanism; DEGRADATION; RESISTANCE; BEHAVIOR; PROGRESS; YSZ;
D O I：
10.3390/coatings14070877
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
To tackle the ever-increasing operating temperature of aero-engines, a La2Ce2O7 (LCO)/yttria partially stabilized zirconia (YSZ) double-layer thermal barrier coating (TBC) was investigated. The LCO/YSZ double-layer samples were annealed with volcanic ash (VA) at 1250 degrees C to assess their stability in comparison with that of standard single-layer YSZ. The findings showed that the double-layer system exhibited greater resistance to VA damage than the single-layer YSZ coating. The corrosion mechanism was characterized by a rapid crystallization reaction between LCO and VA, where the kinetics of the solution's reprecipitation reaction outpaced the penetration rate into the coating's open pores.
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页数：17
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