[논문]Effects of Healing Agent on Crack Propagation Behavior in Thermal Barrier Coatings

Jeon, Soo-Hyeok; Jung, Sung-Hoon; Jung, Yeon-Gil

doi:10.4191/kcers.2017.54.6.02

Effects of Healing Agent on Crack Propagation Behavior in Thermal Barrier Coatings 원문보기

한국세라믹학회지 = Journal of the Korean Ceramic Society, v.54 no.6, 2017년, pp.492 - 498

Jeon, Soo-Hyeok (School of Materials Science and Engineering, Changwon National University) , Jung, Sung-Hoon (School of Materials Science and Engineering, Changwon National University) , Jung, Yeon-Gil (School of Materials Science and Engineering, Changwon National University)

Abstract ▼ AI-Helper

A thermal barrier coating (TBC) with self-healing property for cracks was proposed to improve reliability during gas turbine operation, including structural design. Effect of healing agent on crack propagation behavior in TBCs with and without buffer layer was investigated through furnace cyclic test (FCT). Molybdenum disilicide ($MoSi_2$) was used as the healing agent; it was encapsulated using a mixture of tetraethyl orthosilicate and sodium methoxide. Buffer layers with composition ratios of 90 : 10 and 80 : 20 wt%, using yttria stabilized zirconia and $MoSi_2$, respectively, were prepared by air plasma spray process. After generating artificial cracks in TBC samples by using Vickers indentation, FCTs were conducted at $1100^{\circ}C$ for a dwell time of 40 min., followed by natural air cooling for 20 min. at room temperature. The cracks were healed in the buffer layer with the healing agent of $MoSi_2$, and it was found that the thermal reliability of TBC can be enhanced by introducing the buffer layer with healing agent in the top coat.

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가설 설정

4) The hardness value of the TBC exhibited a decreasing trend with increasing the healing agent content. The decrease in hardness for the buffer layer with the healing agent is expected to improve TBC lifetime by decreasing the elastic modulus at the interface and increasing the stress capacity and deformation resistance.

제안 방법

All indentations were conducted at room temperature according to the “Vickers Indentation Hardness of Advanced Ceramics (ASTM C1327-03)” standard. An energy dispersive spectrometer (EDS, Oxford Instruments, Oxford, UK) was used to analyze the composition variation of the healing agent after the FCT.
Before fabricating the TBC specimen, the yttria-stabilized ZrO₂ (8YSZ, Sigma-Aldrich Korea, Yongin, Korea) and the healing agent (MoSi₂) were mixed at two weight ratios of 90: 10 and 80 : 20, and then the circular specimens (composite specimen) of 10 mm diameter were prepared at 13 MPa in order to investigate the reactivity between the 8YSZ and the healing agent, and their self-healing capability. For investigating the oxidation behavior of the healing agent only, the specimen was prepared using the healing agent with same condition.
In this study, a thermal barrier coating (TBC) with self-healing capability through a buffer layer was fabricated and its crack healing behavior was investigated through furnace cyclic test (FCT) and isothermal oxidation test, and the following conclusions were obtained.
In this study, a top coat layer with a buffer layer containing the self-healing agent was designed and its microstructure was optimized. Also, furnace cyclic test (FCT) was conducted in a high temperature environment of 1100℃.

대상 데이터

for a dwell time of 5 h under an argon atmosphere. An Ni alloy (Nimonic 263, a nominal composition of Ni-20Cr-20Co-5.9Mo-0.5Al-2.1Ti-0.4Mn-0.3Si-0.06C, in wt%, Thyssen Krupp VDM, Germany) was used as a base material (substrate) for the TBC; the diameter and thickness of the specimens were 25.4 mm and 3 mm, respectively. Before forming the bond coat, the base substrate was sand-blasted using alumina powder of 60 mesh; the high velocity oxygen fuel (HVOF) method with AMDRY 9954 (Oerlikon Metco AG, nominal composition of Co-32Ni-21Cr-8Al-0.
(Sigma-Aldrich Korea, Yongin, Korea), which was encapsulated with a liquid precursor to prevent early oxidation. Tetraethyl orthosilicate (TEOS, Sigma-Aldrich Korea, Yongin, Korea) and sodium methoxide (NaOMe, Sigma-Aldrich Korea, Yongin, Korea) were used as the liquid precursor. Encapsulation of the healing agent was conducted using each precursor and the precursor mixed together at specific weight ratios; TEOS, NaOMe, and isobutyl alcohol at the weight ratio of 38 : 56 : 6 to MoSi₂ powder of 250 g.

성능/효과

2) FCT for the composite with the encapsulated healing agent showed that crack propagation was suppressed.
3) Although the isothermal oxidation test for the TBC with the buffer layer including the healing agent showed that crack propagation was inhibited by the reaction between the crack and the healing agent, oxidation of the healing agent was observed for areas without cracks.
First, the hardness values of each buffer layer with 10 and 20 wt% healing agent were determined to be 3.5 ± 0.2 and 3.2 ± 0.2 GPa, respectively, while the hardness of the top coat without the healing agent showed a relatively high value of 4.8 ± 0.2 GPa.

후속연구

However oxidation of the healing agents was observed even for parts without cracks. To improve the thermal durability of the TBC, oxidation has to be prevented by using the encapsulated healing agent; further research in this direction is necessary. Especially, further research to identify new materials for the encapsulation of MoSi₂, or new healing agents with low melting points and high fluidity, is necessary for application to next generation TBC utilizing rare earth resources.

참고문헌 (24)

S. W. Myoung, S. S. Lee, H. S. Kim, M. S. Kim, Y. G. Jung, S. I. Jung, T. K. Woo, and U. Paik, "Effect of Post Heat Treatment on Thermal Durability of Thermal Barrier Coatings in Thermal Fatigue Tests," Surf. Coat. Technol., 215, 46-51 (2013).

상세보기
P. Richer, M. Yandouzia, L. Beauvais, and B. Jodoin, "Oxidation Behaviour of CoNiCrAlY Bond Coats Produced by Plasma, HVOF and Cold Gas Dynamic Spraying," Surf. Coat. Technol., 204 [24] 3962-74 (2010).

상세보기
B. Rajasekaran, G. Mauer, and R. Va $\ss$ en, "Enhanced Characteristics of HVOF-Sprayed MCrAlY Bond Coats for TBC Applications," J. Therm. Spray Technol., 20 [6] 1209-16 (2011).

상세보기
A. G. Evans, D. R. Mumm, J. W. Hutchinson, G. H. Meier, and F. S. Pettit, "Mechanisms Controlling the Durability of Thermal Barrier Coatings," Prog. Mater. Sci., 46 [5] 505-53 (2001).

상세보기
D. R. Clarke, M. Oechsner, and N. P. Padture, "Thermal-Barrier Coatings for More Efficient Gas-turbine Engines," MRS Bull., 37 [10] 891-98 (2012).

상세보기
D. R. Clarke and C. G. Levi, "Materials Design for the Next Generation Thermal Barrier Coatings," Annu. Rev. Mater. Res., 33 [1] 383-417 (2003).

상세보기
R. A. Miller, "Current Status of Thermal Barrier Coatings-An Overview," Surf. Coat. Technol., 30 [1] 1-11 (1987).

상세보기
E. Ercenk, U. Sen, and S. Yilmaz, "Structural Characterization of Plasma Sprayed Basalt-SiC Glass-Ceramic Coatings," Ceram. Int., 37 [3] 883-89 (2011).

상세보기
S. Das, A. K. Mukhopadhyay, S. Datta, G. C. Das, and D. Basu, "Hard Glass-Ceramic Coating by Microwave Processing," J. Eur. Ceram. Soc., 28 [4] 729-38 (2008).

상세보기
T. A. Dobbins, R. Knight, and M. J. Mayo, "HVOF Thermal Spray Deposited $Y_2O_3$ -Stabilized $ZrO_2$ Coatings for Thermal Barrier Applications," J. Therm. Spray Technol., 12 [2] 214-25 (2003).

상세보기
N. P. Padture, M. Gell, and E. H. Jordan, "Thermal Barrier Coatings for Gas-Turbine Engine Applications," Science, 296 [5566] 280-84 (2002).

상세보기
W. G. Sloof, S. R. Turteltaub, A. L. Carabat, Z. Derelioglu, S. A. Ponnusami, and G. M. Song, "Crack Healing in Yttria Stabilized Zirconia Thermal Barrier Coatings," pp. 219-27 in Pioneering Research in Netherlands, Delft University Press, 2015.
W. R. Chen, X. Wu, B. R. Marple, R. S. Lima, and P. C. Patnaik, "Pre-Oxidation and TGO Growth Behaviour of an Air-Plasma-Sprayed Thermal Barrier Coating," Surf. Coat. Technol., 202 [16] 3787-96 (2008).

상세보기
F. Nozahic, D. Monceau, and C. Estournes, "Thermal Cycling and Reactivity of a $MoSi_2/ZrO_2$ Composite Designed for Self-Healing Thermal Barrier Coatings," Mater. Des., 94, 444-48 (2016).

상세보기
S. D. Mookhoek, H. R. Fischer, and S. van der Zwaag, "A Numerical Study into the Effects of Elongated Capsules on the Healing Efficiency of Liquid-Based Systems," Comput. Mater. Sci., 47 [2] 506-11 (2009).

상세보기
Z. Derelioglu, A. L. Carabat, G. M. Song, S. van der Zwaag, and W. G. Sloof, "On the Use of B-Alloyed $MoSi_2$ Particles as Crack Healing Agents in Yttria Stabilized Zirconia Thermal Barrier Coatings," J. Eur. Ceram. Soc., 35 [16] 4507-11 (2015).

상세보기
A. A. Sharif, "High-Temperature Oxidation of $MoSi_2$ ," J. Mater. Sci., 45 [4] 865-70 (2010).

상세보기
M. J. Meijerink, "Coating of $MoSi_2$ Healing Particles for Self-Healing Thermal Barrier Coatings," in MS Thesis, Delft University of Technology, Delft, 2015.
M. Erfanmanesh, S. R. Bakhshi, M. Khajelakzay, and M. Salekbafghi, "The Effect of Argon Shielding Gas at Plasma Spray Process on the Structure and Properties of $MoSi_2$ Coating," Ceram. Int., 40 [3] 4529-33 (2014).

상세보기
M. Kilo, C. Argirusis, G. Borchardt, and R. A. Jackson, "Oxygen Diffusion in Yttria Stabilized Zirconia-Experimental Results and Molecular Dynamics Calculations," Phys. Chem. Chem. Phys., 5 [11] 2219-24 (2003).

상세보기
Z. Yao, J. Stiglich, and T. S. Sudarshan, "Molybdenum Silicide Based Materials and Their Properties," J. Mater. Eng. Perform., 8 [3] 291-304 (1999).
H. Heuer, "Oxygen and Aluminum Diffusion in ${\alpha}$ - $Al_2O_3$ : How Much Do We Really Understand?," J. Eur. Ceram. Soc., 28 [7] 1495-507 (2008).

상세보기
E. H. Kim, W. R. Lee, Y. G. Jung, and C. S. Lee, "A New Binder System for Preparing High Strength Inorganic Molds in Precision Casting," Mater. Chem. Phys., 126 [1] 344-51 (2011).

상세보기
A. Portinha, V. Teixeira, J. Carneiro, J. Martins, M. F. Costa, R. Vassen, and D. Stoever, "Characterization of Thermal Barrier Coatings with a Gradient in Porosity," Surf. Coat. Technol., 195 [2] 245-51 (2005).

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Effects of Healing Agent on Crack Propagation Behavior in Thermal Barrier Coatings 원문보기

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Effects of Healing Agent on Crack Propagation Behavior in Thermal Barrier Coatings 원문보기

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