OPTIMIZING ADHESION STRENGTH OF ENVIRONMENT BARRIER COATING USING SLURRY SPRAY TECHNIQUE

Slurry spray technique (SST) is a distinctive variant among the numerous and already established coating techniques. Functionally graded thermal barrier and environmental barrier coating have been the functionalities developed so far for the process. Among the choice of the various ceramic feedstocks available mullite and partially stabilized zircona have been found suitable and investigated for the coating deposition via SST. This chapter reports the findings of the corrosion studies in simulated industrial corrosive environments and characterization results of the six sets of slurry sprayed mulite-nickel based coatings. Decent protection against coating has been found during the immersion test performed on these coatings for evaluating their corrosion performance. The developed coatings are recommended for use in applications to endure the elevated temperature and inflict corrosion. Thermal cycling test was performed to support the acceptable thermal shock resistance and coating compliance of the developed coatings.

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Improvement of Oxidation Resistance and Adhesion Strength of Thermal Barrier Coating by Grinding and Grit-Blasting Treatments

Journal of Thermal Spray Technology ◽

10.1007/s11666-020-01057-y ◽

2020 ◽

Vol 29 (7) ◽

pp. 1728-1740 ◽

Cited By ~ 1

Author(s):

Kiyohiro Ito ◽

Takashi Shima ◽

Makoto Fujioka ◽

Masayuki Arai

Keyword(s):

Oxidation Resistance ◽

Thermal Barrier Coating ◽

Adhesion Strength ◽

Thermal Barrier ◽

Grit Blasting ◽

Barrier Coating

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Effect of thermally growth oxides (TGO) on adhesion strength for high purity yitria stabilised zirconia (YSZ) and rare – Earth lanthanum zirconates (LZ) multilayer thermal barrier coating before and after isothermal heat treatment

10.1063/1.5010564 ◽

2017 ◽

Author(s):

Salmi Mohd Yunus ◽

Azril Dahari Johari ◽

Shuib Husin

Keyword(s):

Heat Treatment ◽

Rare Earth ◽

Thermal Barrier Coating ◽

Adhesion Strength ◽

High Purity ◽

Thermal Barrier ◽

Isothermal Heat Treatment ◽

Barrier Coating ◽

Before And After

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Environmental Barrier Coating Oxidation and Adhesion Strength

Volume 3: Ceramics; Coal, Biomass, Hydrogen, and Alternative Fuels ◽

10.1115/gt2020-14845 ◽

2020 ◽

Author(s):

Bryan J. Harder ◽

Michael J. Presby ◽

Jon A. Salem ◽

Steven M. Arnold ◽

Subodh K. Mital

Keyword(s):

Adhesion Strength ◽

Physical Vapor Deposition ◽

Ceramic Matrix Composites ◽

Thermally Grown Oxide ◽

Matrix Composites ◽

X Ray Diffraction ◽

Environmental Barrier Coatings ◽

Environmental Barrier ◽

Barrier Coating ◽

Coating Durability

Abstract Plasma Spray-Physical Vapor Deposition (PS-PVD) environmental barrier coatings (EBCs) of Yb2Si2O7 were deposited on SiC and exposed in a steam environment (90% H2O/O2) at 1426°C to form a thermally grown oxide (TGO) layer between the substrate and EBC. In advanced ceramic material systems such as coated ceramic matrix composites (CMCs), the TGO layer is the weak interface in coated CMC systems and directly influences component lifetimes. The effect of surface roughness and TGO thickness on the adhesion strength were evaluated by mechanical testing of the coatings after exposure. Morphology and oxide layer thickness were analyzed with electron microscopy while the composition and crystal structure were tracked with X-ray diffraction. The strength of the system is evaluated with respect to oxidation rate to give a qualitative understanding of coating durability.

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Effect of Interfacial Roughness of Bond Coat on the Residual Adhesion Strength of a Plasma Sprayed TBC System after Thermal Cycle Fatigue(Thermal Barrier Coating Systems for Gas Turbines)

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A ◽

10.1299/kikaia.76.831 ◽

2010 ◽

Vol 76 (767) ◽

pp. 831-838

Author(s):

Yasuhiro YAMAZAKI ◽

Hirotaka FUKANUMA ◽

Naoyuki OHNO

Keyword(s):

Thermal Barrier Coating ◽

Adhesion Strength ◽

Bond Coat ◽

Gas Turbines ◽

Thermal Cycle ◽

Thermal Barrier ◽

Cycle Fatigue ◽

Special Issue ◽

Barrier Coating ◽

Plasma Sprayed

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Microstructure and Mechanical Properties of TiO2 Coatings Prepared by Plasma Spray Technique

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.264.165 ◽

2017 ◽

Vol 264 ◽

pp. 165-168

Author(s):

Mohamad Siti Mariam ◽

M.N. Ahmad Fauzi ◽

Abdullah Ahmad Nizam

Keyword(s):

Mechanical Properties ◽

Plasma Spraying ◽

Adhesion Strength ◽

Plasma Spray ◽

Anatase Phase ◽

Input Power ◽

Microstructure And Mechanical Properties ◽

Spraying Parameters ◽

Spray Technique ◽

Strong Adhesion

Plasma spray technique is used to produce coatings with excellent hardness, wear resistance and strong adhesion. TiO2 coatings were prepared by plasma spraying at low plasma power.TiO2 powder with anatase phase structure was used to prepare the coatings. The effect of plasma spraying parameters on the microstructure and mechanical properties of the coatings were investigated. The microstructure of the coatings showed that the coatings were formed by fully and partially melted particles. The coatings dominant phase is rutile and only a few coatings contained traces of anatase phase. The hardness and adhesion strength of the coatings were tested using Vickers microhardness and pull-off adhesion tester. The adhesion strength obtained was between 10-20 MPa and the microhardness result is between 300 - 800 Hv. The spraying parameters such as input power, spraying distance and plasma gas ratio influenced the properties of the produced coatings.

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