Effect of nano-cracks on heat conduction and ion diffusion of 8YSZ thermal barrier coatings

doi:10.13251/j.issn.0254-6051.2024.06.039

Abstract

Abstract: Effect of nano-cracks on thermal transport properties and ion diffusion of 8YSZ (8mol% Y₂O₃, stabilizing ZrO₂) thermal barrier coating at 1473 K was studied by means of non-equilibrium molecular dynamics method. The effects of crack location, crack length and crack number on thermal conductivity and ion diffusion of the 8YSZ thermal barrier coating were described. The results show that the thermal conductivity of the material with the nano-cracks cross wise arrange on both sides of the model is lower than that with the cracks evenly distribute along the heat flow direction on the same side of the model, but the crack location distribution has a little effect on the diffusion of O^2-. With the increase of crack length or number, the thermal conductivity decreases and the O^2- migration slows down. It is found that small cracks with a large number and uniform distribution have a stronger inhibition on the thermal transport of the 8YSZ thermal barrier coating than those with a small number and long length.

Key words: thermal barrier coating, molecular dynamics simulation, ion diffusion, thermal conductivity, phonon scattering

CLC Number:

TB332

Chen Yuhui, Sun Jiaxiang, Jiang Pengyang, Chai Zonghua, Zhang Baiqiang. Effect of nano-cracks on heat conduction and ion diffusion of 8YSZ thermal barrier coatings[J]. Heat Treatment of Metals, 2024, 49(6): 248-253.

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