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5325 |
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Examination of lamellar pores between thermally sprayed splats using white light interferometry |
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Lin Chen* / Xi'an Jiaotong University, P.R. China Yu-ming Zhang/ Xi'an Jiaotong University, China Guan-jun Yang/ Xi'an Jiaotong University, China Cheng-xin Li/ Xi'an Jiaotong University, China Chang-jiu Li/ Xi'an Jiaotong University, China |
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Numerous lamellar pores and intrasplat cracks are two essential characteristics of thermally sprayed ceramic coatings. The distribution of lamellar pores is very important to thermal resistance for thermal barrier coatings. To in-depth understanding the formation mechanism of lamellar pores, a new method based on white light interferometry was employed to characterize the distribution of lamellar pores. The statistics of the size of bonded area and nominal bonding ratio for YSZ and LZ coatings ware obtained at deposition temperatures 100-600 °C. Also, lamellar pores were found to be parabola-shaped. In addition, the lamellar pores were observed using focused ion beam (FIB). The results were well consistent with those from white light interferometry. The mechanical analysis was addressed and consistent with the experimental results. The identification of the distribution of lamellar pores in the present study shed further light on coating-structure design and optimization. |