Numerical Study on Effect of Pore Structure on Erosion Resistance of Atmospheric Plasma Thermal Barrier Coating[J]. 2022, 56(1): 113-119.
DOI:
Numerical Study on Effect of Pore Structure on Erosion Resistance of Atmospheric Plasma Thermal Barrier Coating[J]. 2022, 56(1): 113-119.DOI: 10.7652/xjtuxb202201013.
Numerical Study on Effect of Pore Structure on Erosion Resistance of Atmospheric Plasma Thermal Barrier Coating
In order to explore the influence of internal defect structure on erosion resistance of atmospheric plasma thermal barrier coatings(APS-TBCs)
a coating model containing a large number of randomly distributed circular pores was established. Based on the explicit dynamic algorithm and the brittle cracking criterion
the failure phenomena of crack propagation and erosion cracking in the ceramic layer under particle impact were simulated. The relationship between the key parameters
such as pore radius(0.1-5 μm)and porosity(0-20%)
and erosive mass loss in the ceramic layer was obtained. Simulation results show that the circular pore structure will change the erosion performance of thermal barrier coatings. For a specific porosity
there is an optimal pore radius
which makes erosion resistance better than that of thermal barrier coatings without pore structure. For a specific pore radius
the erosion mass of the coating gradually tends to be stable with the increase of porosity. This study may provide a reference for predicting service life of the coating
improving the plasma spraying preparation process and enhancing its erosion resistance.
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