Effect of coating thickness on microstructure and low temperature cyclic thermal fatigue behavior of thermal barrier coating (Al2O3)

International Conference on Recent Advances in Materials, Mechanical and Civil Engineering

材料科学;机械制造;土木建筑工程

Verma, Vijay^1 ; Patel, Sachin^2 ; Swarnkar, Vikas^3 ; Rajput, S.K.^1

Mechancal Engineering Department, Bundelkhand Institute of Engineering and Technology, Jhansi

284128, India^1

Mechanical Engineering Department, Bundelkhand Institute of Engineering and Technology, Jhansi

Uttar Pradesh

284128, India^2

Diesel Loco Shed Central Railway, Pune

Maharstra

411001, India^3

关键词: Coating failures;    Coating thickness;    Detonation gun;    Fatigue behavior;    Fatigue behaviour;    Low temperatures;    Thermal barrier coating (TBC);    Thermal durability;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/330/1/012050/pdf
DOI  :  10.1088/1757-899X/330/1/012050

来源: IOP

【 摘 要 】

Effect of coating thickness on low temperature cyclic thermal fatigue behaviour of Al2O3thermal barrier coating (TBC) was concluded through the cyclic furnace thermal fatigue test (CFTF). Detonation gun (Thermal Spray) process was used for bond coating of NiCr and top coating of Al2O3on Aluminium Alloy 6061 substrate. Top coating was done at two level of thickness to investigate the effect of coating thickness on low temperature cyclic thermal fatigue. The top coat of thickness 100μm-150μm was considered as thin TBC while the top coat of thickness 250μm-300μm was considered as thick TBC. The thickness of bond coat was taken as 120μm constant for both level of Al2O3top coating. During CFTF test appearance of any crack on coated surface was adapted as main criterion of coating failure. Crack initiation was observed at edges and corner of thin thermal barrier coating after 60 number of thermal fatigue cycles while in case of thick thermal barrier coating these crack initiation was observed after 72 cycles of cyclic thermal fatigue test. During the study, it was observed that thick thermal barrier coating survived for long duration in comparison of thin TBC. Hence it can be concluded that application of thick TBC is more favourable to improve thermal durability of any component.