Nano-structured yttria-stabilized zirconia coating by electrophoretic deposition

Abstract The most important role of thermal barrier coatings is to reduce the temperature of the substrate in high temperature applications. Nano particle zirconia might be a suitable choice for improving the efficiency of thermal barrier coatings. Nanostructured coatings have lower thermal conduction, higher thermal expansion and lower dimensional variations at higher temperatures in comparison with the microstructured coatings. Electrophoretic deposition has been preferred for thermal barrier coatings due to its simplicity, controllability and low cost. In the present study, three different suspensions of ZrO2–8 wt%Y2O3 (40 nm) made with ethanol, acetone and acetyl acetone were used. Electrophoretic deposition was conducted at a fixed voltage of 60 V for 120 s on aluminized Inconel 738-LC, and then heat treated at 1100 C for 4 h in air atmosphere. The coating morphology and elemental distribution were studied using scanning electron microscopy. It was observed that suspension media have an important effect on the quality of the final product. Acetyl acetone showed better dispersion of particles than the other two media. Consequently, deposition from acetyl acetone resulted in uniform and crack-free layers while those from ethanol and acetone were completely non-uniform due to agglomeration and low viscosity, respectively.

[1]  M. Mayo,et al.  Thermodynamics of the tetragonal-to-monoclinic phase transformation in fine and nanocrystalline yttria-stabilized zirconia powders , 2003 .

[2]  K. Vanmeensel,et al.  Origin of the Potential Drop Over the Deposit During Electrophoretic Deposition , 2006 .

[3]  A. Boccaccini,et al.  Electrophoretic Deposition of Nanomaterials , 2012 .

[4]  S. K. Sadrnezhaad,et al.  Two-step sintering of nanocrystalline 8Y2O3 stabilized ZrO2 synthesized by glycine nitrate process , 2009 .

[5]  R. Mévrel,et al.  State of the art on high-temperature corrosion-resistant coatings , 1989 .

[6]  Xianliang Jiang,et al.  Overview on the Development of Nanostructured Thermal Barrier Coatings , 2009 .

[7]  M. M. Souza,et al.  Effect of the fuel type on the synthesis of yttria stabilized zirconia by combustion method , 2009 .

[8]  J. Michler,et al.  Critical particle concentration in electrophoretic deposition , 2010 .

[9]  Hongbo Guo,et al.  Microstructure and Thermal Properties of Plasma Sprayed Thermal Barrier Coatings from Nanostructured YSZ , 2010 .

[10]  Yi Zeng,et al.  Microstructural characterization of plasma-sprayed nanostructured zirconia powders and coatings , 2003 .

[11]  Christoph Leyens,et al.  Some recent trends in research and technology of advanced thermal barrier coatings , 2003 .

[12]  Malika Ammam.  Electrophoretic deposition under modulated electric fields: a review , 2012 .

[13]  I. Zhitomirsky,et al.  Electrophoretic nanotechnology of composite electrodes for electrochemical supercapacitors. , 2013, The journal of physical chemistry. B.

[14]  Dinesh K. Gupta,et al.  Ceramic thermal barrier coatings for commercial gas turbine engines , 1991 .

[15]  T. He,et al.  Synthesis of nano-sized YSZ powders from glycine-nitrate process and optimization of their properties , 2005 .

[16]  H. Yamauchi,et al.  Effect of CoO Doping on the Sintering Ability and Mechanical Properties of Y-TZP , 2004 .

[17]  Tilmann Beck,et al.  Behaviour of an EB-PVD thermal barrier coating system under thermal–mechanical fatigue loading , 2003 .

[18]  Robert A. Miller,et al.  Thermal barrier coatings for aircraft engines: history and directions , 1997 .

[19]  E. Jordan,et al.  Surface geometry and strain energy effects in the failure of a (Ni, Pt)Al/EB-PVD thermal barrier coating , 2004 .

[20]  Xiufeng Xiao,et al.  Effect of suspension stability on electrophoretic deposition of hydroxyapatite coatings , 2006 .

[21]  H. Maleki-Ghaleh,et al.  Hydroxyapatite coating on NiTi shape memory alloy by electrophoretic deposition process , 2012 .

[22]  P. Xiao,et al.  The influence of pH on particle packing in YSZ coatings electrophoretically deposited from a non-aqueous suspension , 2010 .

[23]  Zongping Shao,et al.  Electrophoretic deposition of YSZ thin-film electrolyte for SOFCs utilizing electrostatic-steric sta , 2011 .

[24]  I. Zhitomirsky,et al.  Electrophoretic deposition of hydroxyapatite , 1997, Journal of materials science. Materials in medicine.

[25]  N. Sakai,et al.  Electrophoretic deposition of YSZ powders for solid oxide fuel cells , 2004 .

[26]  J. Fransaer,et al.  The effect of electrolyte conductivity on electrophoretic deposition. , 2008, Journal of colloid and interface science.

[27]  Carlos G. Levi,et al.  MATERIALS DESIGN FOR THE NEXT GENERATION THERMAL BARRIER COATINGS , 2003 .

[28]  F. Pettit,et al.  High-temperature corrosion of alumina-forming coatings for superalloys , 1989 .

[29]  P. Sarkar,et al.  Electrophoretic Deposition (EPD): Mechanisms, Kinetics, and Application to Ceramics , 1996 .

[30]  S. Aruna,et al.  A study on the electrophoretic deposition of 8YSZ coating using mixture of acetone and ethanol solvents , 2008 .

[31]  R. Yazdani-rad,et al.  Effect of dispersing media on microstructure of electrophoretically deposited TiO2 nanoparticles in dye-sensitized solar cells , 2011 .

[32]  Laxmidhar Besra,et al.  A review on fundamentals and applications of electrophoretic deposition (EPD) , 2007 .

[33]  Meilin Liu,et al.  Preparation of yttria-stabilized zirconia (YSZ) films on La0.85Sr0.15MnO3 (LSM) and LSM–YSZ substrates using an electrophoretic deposition (EPD) process , 2001 .