Residual stresses in plasma sprayed partially stabilised zirconia TBCs: Influence of the deposition temperature

被引:45
作者
Scardi, P [1 ]
Leoni, M [1 ]
Bertamini, L [1 ]
机构
[1] CSM,I-00102 ROME,ITALY
关键词
stress; plasma processing and deposition; zirconium oxide; coatings;
D O I
10.1016/0040-6090(95)08163-1
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Yttria-partially stabilised zirconia (Y-PSZ) coatings were plasma sprayed in air on aluminium bars under controlled conditions of surface cooling. The effect of the deposition temperature (T-dep) on coating microstructure and residual stresses was studied. X-ray diffraction (XRD) line broadening analysis showed crystallites to be much smaller than the columnar grains visible on scanning electron microscopy micrographs. Moreover, the stabilising oxide (Y2O3) was not uniformly distributed among the various crystalline domains. By increasing T-dep the coating morphology was not visibly affected, while the lattice disorder decreased slightly because of a reduction of point defect density, mainly recognised as excess oxygen vacancies. On the contrary, the residual stress field was strictly connected to T-dep. Surface and average (bulk) residual stresses were measured by two distinct techniques: XRD (sigma(XRD)) and the coating-length change after debonding from the substrate (sigma(D)), respectively. The surface was always in tension, approaching the value of quenching stress (30-40 MPa) at low T-dep, whereas the bulk was always in compression. Assuming a linear gradient model, sigma(XRD) and sigma(D) were used to calculate the residual stress trend inside the ceramic as a function of T-dep.
引用
收藏
页码:96 / 103
页数:8
相关论文
共 34 条
[1]   X-RAY MACROSTRESS DETERMINATION ON TEXTURED MATERIAL - USE OF THE ODF FOR CALCULATING THE X-RAY COMPLIANCES [J].
BARRAL, M ;
LEBRUN, JL ;
SPRAUEL, JM ;
MAEDER, G .
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1987, 18 (07) :1229-1238
[2]   INFLUENCE OF CE3+/CE4+ RATIO ON PHASE-STABILITY AND RESIDUAL-STRESS FIELD IN CERIA YTTRIA STABILIZED ZIRCONIA PLASMA-SPRAYED COATINGS [J].
DALMASCHIO, R ;
SCARDI, P ;
LUTTEROTTI, L ;
INGO, GM .
JOURNAL OF MATERIALS SCIENCE, 1992, 27 (20) :5591-5596
[3]  
Delhez R., 1987, Surface Engineering, V3, P331
[4]   CALCULATION OF RESIDUAL THERMAL-STRESS IN PLASMA-SPRAYED COATINGS [J].
ELSING, R ;
KNOTEK, O ;
BALTING, U .
SURFACE & COATINGS TECHNOLOGY, 1990, 43-4 (1-3) :416-425
[5]   THE DURABILITY AND PERFORMANCE OF COATINGS IN GAS-TURBINE AND DIESEL-ENGINES [J].
FAIRBANKS, JW ;
HECHT, RJ .
MATERIALS SCIENCE AND ENGINEERING, 1987, 88 :321-330
[6]   INVESTIGATION OF RESIDUAL-STRESS GENERATION DURING THERMAL SPRAYING BY CONTINUOUS CURVATURE MEASUREMENT [J].
GILL, SC ;
CLYNE, TW .
THIN SOLID FILMS, 1994, 250 (1-2) :172-180
[7]   RESIDUAL-STRESSES IN ZRO2-8-PERCENT-Y2O3 PLASMA-SPRAYED THERMAL BARRIER COATINGS [J].
HOBBS, MK ;
REITER, H .
SURFACE & COATINGS TECHNOLOGY, 1988, 34 (01) :33-42
[8]   THE EFFECT OF RESIDUAL-STRESSES ON THE DEBONDING OF COATINGS .1. A MODEL FOR DELAMINATION AT A BIMATERIAL INTERFACE [J].
HOWARD, SJ ;
TSUI, YC ;
CLYNE, TW .
ACTA METALLURGICA ET MATERIALIA, 1994, 42 (08) :2823-2836
[9]   ELASTIC-ANISOTROPY IN ZIRCONIA SINGLE-CRYSTALS [J].
INGEL, RP ;
LEWIS, D .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1988, 71 (04) :265-271
[10]   X-RAY PHOTOELECTRON SPECTROSCOPIC INVESTIGATION OF IMPURITY PHASE SEGREGATION IN CERIA YTTRIA ZIRCONIA [J].
INGO, GM ;
MATTOGNO, G ;
ZACCHETTI, N ;
SCARDI, P ;
DALMASCHIO, R .
JOURNAL OF MATERIALS SCIENCE LETTERS, 1991, 10 (06) :320-322