Material and Mechanical Aspects of CMAS Damage Progression on Thermal Barrier Coatings and its Non-Destructive Detection

Yukie  Hayashi; Siddharth Lokachari; Satoshi Yamagishi; Masakazu Okazaki

doi:10.4028/www.scientific.net/MSF.879.720

Paper Titles

X-Ray and Neutron Scattering Studies of the 9Ni Cryogenic Steel and its Weld Joint
p.697

Surface Modification of Magnesium Alloy by Shot Lining and Laser Heating
p.703

Environment-Assisted Cracking of Super-Elastic TiNi Alloy Depending on Solution pH and Electrochemical Potential
p.709

Evaluation of Weldability of Titanium Alloy Ti-6Al-4V and Aluminum Alloy 6061 Produced by Electron Beam Welding
p.714

Material and Mechanical Aspects of CMAS Damage Progression on Thermal Barrier Coatings and its Non-Destructive Detection
p.720

Effects of Electric Current on the Microstructures and Mechanical Properties of Artificial Aged 6061 Alloy
p.726

Influence of High-Pressure Torsion on the Microstructure and the Hardness of a Ti-Rich High-Entropy Alloy
p.732

Magnetic Shape Memory Effect in Ni-Mn-Ga Single Crystal
p.738

Microstructure and Microtexture Evolution of Invar Alloy after Cross Accumulative Roll Bonding (CARB) Compared to ARB
p.744

HomeMaterials Science ForumMaterials Science Forum Vol. 879Material and Mechanical Aspects of CMAS Damage...

Material and Mechanical Aspects of CMAS Damage Progression on Thermal Barrier Coatings and its Non-Destructive Detection

Abstract:

Thermal barrier coatings (TBCs) on turbine blades in gas turbine engines are in some cases damaged at high temperatures exceeding 1200°C by calcium-magnesium-alumino-silicates (CMAS) resulting from the ingestion of siliceous minerals. In this study, material interaction between molten CMAS and yttria-stabilized zirconia (YSZ) was investigated using a single crystal YSZ material and a synthetic CMAS product. Reaction between the molten CMAS and YSZ was significant at high temperature resulting in the infiltration of CMAS into the dense bulk-YSZ. The extent of interaction between CMAS and YSZ was found to be dependent on the crystallographic plane of the YSZ. The change in elastic stiffness due to the CMAS infiltration was also found by using a vibrating reed technique. The CMAS infiltrated layer had elastic stiffness higher by approximately five times of the non-infiltrated one. An attempt to detect the CMAS damage progression was also made through an AC impedance method. The proposed AC impedance technique is expected to be a useful technique to evaluate the CMAS infiltration as well as the associated delamination of TBC top coat.

You might also be interested in these eBooks

View Preview

View Preview

Info:

Periodical:

Materials Science Forum (Volume 879)

Pages:

720-725

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.879.720

Citation:

Cite this paper

Online since:

November 2016

Authors:

Yukie Hayashi*, Siddharth Lokachari, Satoshi Yamagishi, Masakazu Okazaki

Keywords:

AC Impedance Technique, Calcium-Magnesium-Alumino-Silicates (CMAS), Elastic Stiffness, Interaction, Non-Destructive Detection, Thermal Barrier Coatings (TBCs)

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

* - Corresponding Author

References

[1] B.B. Seth, Superalloys - The utility gas turbine perspective, Superalloys 2000 (2000) 3-12.

DOI: 10.7449/2000/superalloys_2000_3_16

Google Scholar

[2] N.P. Padture, M. Gell, E.H. Jordan, Thermal barrier coatings gas-turbine engine applications, Science 296 (2002) 280-284.

DOI: 10.1126/science.1068609

Google Scholar

[3] M.P. Borom, C.A. Johnson, L.A. Peluso, Role of environmental deposits and operating surface temperature in spallation of air plasma sprayed thermal barrier coatings, Surf. Coat. Technol. 86-87 (1996) 116-126.

DOI: 10.1016/s0257-8972(96)02994-5

Google Scholar

[4] C. Mercer, S. Faulhaber, A.G. Evans, R. Darolia, A delamination mechanism for thermal barrier coatings subject to calcium-magnesium-alumino-silicate (CMAS) infiltration, Acta Mater. 53 (2005) 1029-1039.

DOI: 10.1016/j.actamat.2004.11.028

Google Scholar

[5] I.G. Wright, T.B. Gibbons, Recent developments in gas turbine materials and technology and their implications for syngas firing, Int. J. Hyd. E. 32 (2007) 3610-3621.

DOI: 10.1016/j.ijhydene.2006.08.049

Google Scholar

[6] Y. Hayashi, S. Yamagishi, M. Okazaki, Damage progression of thermal barrier coatings by CMAS, J. Soc. Mater. Sci., Jpn. 64 2 (2015) 134-139.

Google Scholar

[7] S. Krämer, J. Yang, C.G. Levi, C.A. John, Thermochemical interaction of thermal barrier coatings with molten CaO-MgO-Al2O3-SiO2 (CMAS) deposits, J. Am. Ceram. Soc. 89 10 (2006) 3167-3175.

DOI: 10.1111/j.1551-2916.2006.01209.x

Google Scholar

[8] A. Aygun, A.L. Vasiliev, N.P. Padture, X. Ma, Novel thermal barrier coatings that are resistant to high-temperature attack by glassy deposits, Acta Mater. 55 (2007) 6734-6745.

DOI: 10.1016/j.actamat.2007.08.028

Google Scholar

[9] M. Okazaki, H. Matsubara, T. Yoshida, New coating processes to fabricate a low elastic modulus top coat for high performance thermal barrier coatings, J. Japan Inst. Metals 69 1 (2005) 48-55.

DOI: 10.2320/jinstmet.69.48

Google Scholar

[10] S. Yamagishi, M. Okazaki, S. Ikeda, H. Fukanuma, A trial to detect a delamination crack growth of thermal barrier ceramic top coat via change of electric capacitance, Trans. Jpn. Soc. Mech. Eng. A 79 801 (2013) 527-535.

DOI: 10.1299/kikaia.79.527

Google Scholar

[11] M. Okazaki, S. Yamagishi, M. Osakabe, H. Fukanuma, A new testing method to evaluate adhesion strength of ceramic top coat in TBCs, J. Solid Mech. Mater. Eng. 4 2 (2010) 345-355.

DOI: 10.1299/jmmp.4.345

Google Scholar

[12] W.N. Unertl, Hand book of Surface Science: Volume 1 Physical Structure, Elsevier Science B. V., Netherlands, (1996).

Google Scholar

[13] G. Ballabio, M. Bernasconi, F. Pietrucci, S. Serra, Ab initio study of yttria-stabilized cubic zirconia surfaces, Phys. Rew. B 70 (2004) 075417.

DOI: 10.1103/physrevb.70.075417

Google Scholar