Paper Title:
Microstructural Study of Nanostructured ZrO2 Based Thermal Barrier Coatings Fabricated by High Efficiency Supersonic Plasma Spraying
  Abstract

In this paper, the microstructure of nanostructured zirconia (ZrO2) based coating fabricated by newly developed process, high efficiency supersonic atmospheric plasma spraying (SAPS), is studied. The velocity and surface temperature of in-flight particles during spraying were monitored by on-line system and the microstructure and phase composition of the as-sprayed coating was characterized with SEM, TEM and XRD. Meanwhile, the bonding strength between the top coating and bond coating was measured. The results showed the average in-flight velocity of YSZ particles in SAPS was about 430m/s, which was much higher than that of conventional atmospheric plasma spraying (APS). The as-sprayed coating was composed of well-adhered fine lamellar structures with thickness of 1-4μm. The desirable structure was attributed to higher impact velocity of in-flight particles during SAPS process, resulting in the improvement of flattening degree of molten particles. Meanwhile, the SAPS-YSZ coating exhibited a bimodal distribution with small grains (30-50nm) and large grains (60-110nm), the latter was the main microstructure of the coating. In addition, it was found that the monoclinic zirconia existing in the original powders transformed into tetragonal phase after plasma spraying and the bonding strength of as-sprayed coating was as high as 46±3MPa. The high efficiency supersonic plasma spray, which offers some unique advantages over the conventional plasma spraying process, is expected to be potentially used to deposit a wide variety of nanostructured coatings at lower cost.

  Info
Periodical
Advanced Materials Research (Volumes 189-193)
Edited by
Zhengyi Jiang, Shanqing Li, Jianmin Zeng, Xiaoping Liao and Daoguo Yang
Pages
80-87
DOI
10.4028/www.scientific.net/AMR.189-193.80
Citation
Y. Bai, Z. H. Han, H. Q. Li, C. Xu, Y. L. Xu, C. H. Ding, J. F. Yang, "Microstructural Study of Nanostructured ZrO2 Based Thermal Barrier Coatings Fabricated by High Efficiency Supersonic Plasma Spraying", Advanced Materials Research, Vols. 189-193, pp. 80-87, 2011
Online since
February 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Claudia Christenn, Syed Asif Ansar
Abstract:Electrolyte layers for solid oxide fuel cells (SOFCs) consisting typically of yttria-stabilized zirconia were prepared using atmospheric...
263
Authors: Chang Jiu Li, Yong Li, Lu Kuo Xing, Guan Jun Yang, Cheng Xin Li
Abstract:Superalloy coating was deposited by cold-spraying using a commercial NiCoCrAlTaY powder. The coating microstructure was investigated by...
595
Authors: Yu Bai, Jian Feng Yang, S.W. Lee
Abstract:In this paper, alumina (Al2O3) slurry properties and spraying drying conditions were optimized by orthogonal experiment for preparing the...
158
Authors: Dong Sheng Wang, Zong Jun Tian, Bin Yang, Li Da Shen
Abstract:In this study, ZrO2-7wt.%Y2O3 thermal barrier coatings (TBCs) were prepared on TiAl base intermetallic alloy substrates by plasma spraying...
191
Authors: M.B. Bhatty, Fazal Ahmad Khalid, Aamer Nusair Khan
Abstract:Thermal barrier coatings (TBCs) are multilayered coatings having the complex structure. In thermal spray coatings characteristic features of...
364