Mechanism Underlying Anelastic Properties of Thermal Spray Coating
The microstructure of thermally sprayed ceramic coatings is characterized by the existence of various pores and microcracks. The porous microstructure makes coating desirable for thermal insulation, but this unique microstructural feature also gives rise to anelastic response under tension and compression loads. Detail investigations of curvature measurements of ceramic coated substrate indicate the coatings to exhibit anelastic behavior composed of nonlinear and hysteresis characteristics. In this paper, the mechanisms of such behaviors were studied from curvature-temperature measurements and finite element analysis through modeling the microstructure of yttria stabilized zirconia (YSZ) coating. Computational models contain numerous randomly distributed pores and microcracks with various sizes, aspect ratios, locations and orientations. The effects of such attributes of pores and microcracks on coating anelastic behavior were studied by simulations of curvature change during thermal cycles.
Y. Liu T. Nakamura V. Srinivasan A. Gouldstone S. Sampath
Department of Mechanical Engineering, State University of New York at Stony Brook, New York, USA Department of Material Science and Engineering, State University of New York at Stony Brook, New Yor
国际会议
北京
英文
2007-05-14（万方平台首次上网日期，不代表论文的发表时间）