A LIFE PREDICTION MODEL OF THERMAL BARRIER COATINGS

2010 ◽  
Vol 24 (15n16) ◽  
pp. 3161-3166 ◽  
Author(s):  
LIYONG NI ◽  
CHAO LIU ◽  
CHUNGEN ZHOU
Keyword(s):  
Crack Propagation ◽  
Prediction Model ◽  
Thermal Barrier Coatings ◽  
Life Prediction ◽  
Crack Propagation Rate ◽  
Thermal Barrier ◽  
Critical Crack ◽  
Critical Crack Length ◽  
Barrier Coatings ◽  
Life Prediction Model

The durability and reliability of thermal barrier coatings(TBCs) have become a major concern of hot-section components due to lack of a reliable life prediction model. In this paper, it is found that the failure location of TBCs is at the TBC/TGO interface by a sequence of crack propagation and coalescence process. The critical crack length of failure samples is 8.8mm. The crack propagation rate is 3-10µm/cycle at the beginning and increases largely to 40µm/cycle near coating failure. A life prediction model based a simple fracture mechanics approach is proposed.

Progress in Thermal Barrier Coatings for Gas Turbine Engines

2014 ◽  
Vol 941-944 ◽  
pp. 1625-1628 ◽  
Author(s):  
Hong Xun Wang ◽  
Wei Fang Zhang ◽  
Tian Jiao Liu
Keyword(s):  
Thermal Barrier Coatings ◽  
Life Prediction ◽  
Turbine Engines ◽  
Thermal Barrier ◽  
Gas Turbine Engines ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Barrier Coatings ◽  
Non Destructive ◽  
Life Prediction Model

In recent years, the key research on thermal barrier coatings (TBCs) lies in the performance improvement of materials as well as structure and process improvement, and achieves new progresses. The difficulty is application of reliability in TBCs. Researchers are exploring that employing non-destructive testing (NDT) and life prediction model on TBCs to conduct a comprehensive and real-time detection and predict the life, so as to improve the safety of TBCs in service process.

scholarly journals A Simulation Study on the Crack Propagation Behavior of Nanostructured Thermal Barrier Coatings with Tailored Microstructure

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 722
Author(s):  
Lei Zhang ◽  
Yu Wang ◽  
Wei Fan ◽  
Yuan Gao ◽  
Yiwen Sun ◽  
...  
Keyword(s):  
Tensile Stress ◽  
Crack Propagation ◽  
Thermal Barrier Coatings ◽  
Element Model ◽  
Nano Particles ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Propagation Behavior ◽  
Stress Zone ◽  
Crack Propagation Behavior

The initiation and propagation of cracks are crucial to the reliability and stability of thermal barrier coatings (TBCs). It is important and necessary to develop an effective method for the prediction of the crack propagation behavior of TBCs. In this study, an extended finite element model (XFEM) based on the real microstructure of nanostructured TBCs was built and employed to elucidate the correlation between the microstructure and crack propagation behavior. Results showed that the unmelted nano-particles (UNPs) that were distributed in the nanostructured coating had an obvious “capture effect” on the cracks, which means that many cracks easily accumulated in the tensile stress zone of the adjacent UNPs and a complex microcrack network formed at their periphery. Arbitrarily oriented cracks mainly propagated parallel to the x-axis at the final stage of thermal cycles and the tensile stress was the main driving force for the spallation failure of TBCs. Correspondingly, I and I–II mixed types of cracks are the major cracking patterns.

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