CMAS corrosion of YSZ thermal barrier coatings obtained by different thermal spray processes

被引：61
作者：
Morelli, Stefania [1 ]
Testa, Veronica [1 ]
Bolelli, Giovanni [1 ,2 ,3 ]
Ligabue, Omar [4 ]
Molinari, Eleonora [4 ]
Antolotti, Nelso [4 ]
Lusvarghi, Luca [1 ,2 ,3 ]
机构：
[1] Univ Modena & Reggio Emilia, Dipartimento Ingn Enzo Ferrari, Via Pietro Vivarelli 10-1, I-41125 Modena, MO, Italy
[2] Univ Modena & Reggio Emilia, Consorzio Interuniv Nazl Sci & Tecnol Mat INSTM, Local Unit, Via Pietro Vivarelli 10-1, I-41125 Modena, MO, Italy
[3] Univ Modena & Reggio Emilia, MORE Ctr Interdipartimentale Ric Appl & Serv Sett, InterMech, Via Pietro Vivarelli 2, I-41125 Modena, MO, Italy
[4] Lincotek Surface Solut SpA, Via Mistrali 7, I-43046 Rubbiano Di Solignano, TR, Italy
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2020年 / 40卷 / 12期
关键词：
Yttria-stabilized zirconia (YSZ); Thermal barrier coating (TBC); CMAS corrosion; Atmospheric plasma spray (APS); Suspension plasma spray (SPS); MOLTEN SILICATE INTERACTIONS; COATED TURBINE BLADE; COLUMNAR MICROSTRUCTURE; DEGRADATION MECHANISMS; FRACTURE SURFACES; IMPURITY CONTENT; PHASE-STABILITY; VOLCANIC ASH; SUSPENSION; TEMPERATURE;
D O I：
10.1016/j.jeurceramsoc.2020.04.058
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Degradation of yttria-stabilized zirconia (YSZ) layers by molten CaO-MgO-Al2O3-SiO2 (CMAS)-based deposits is an important failure mode of thermal barrier coating (TBC) systems in modern gas turbines. The present work aimed to understand how the chemical purity and microstructure of plasma-sprayed YSZ layers affect their response to CMAS corrosion. To this end, isothermal corrosion tests (1 h at 1250 degrees C) were performed on four different kinds of YSZ coatings: atmospheric plasma-sprayed (APS) layers obtained from standard- and high-purity feedstock powders, a dense - vertically cracked (DVC) layer, and a suspension plasma sprayed (SPS) one. Characterization of corroded and non-corroded samples by FEG-SEM, EBSD and micro-Raman spectroscopy techniques reveals that, whilst all YSZ samples suffered grain-boundary corrosion by molten CMAS, its extent could vary considerably. High chemical purity limits the extent of grain-boundary dissolution by molten CMAS, whereas high porosity and/or fine crystalline grain structure lead to more severe degradation.
引用
收藏
页码：4084 / 4100
页数：17
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