Y 3 Al 5 O 12 ( YAG ), Y 2 O 3 , and Al 2 O 3 ceramic coatings were manufactured to investigate the plasma erosion properties. The X‐Ray Diffraction ( XRD ) analysis confirmed that YAG coating was synthesized successfully by Y 2 O 3 and Al 2 O 3 mixture suspension using the plasma spraying method. Meanwhile, metastable phases were found in Y 2 O 3 and Al 2 O 3 coatings due to the quenching in cooling process of melted droplets. The coating surface morphology and microstructure of cross sections were characterized by SEM . The results reveal that coatings are composed by ultrafine splats and exhibit dense lamellar structure. The plasma erosion properties were evaluated at different etching test power under Ar/ CF 4 /O 2 plasma gas. The experimental results clarify that both of YAG and Y 2 O 3 coatings show the better plasma erosion resistance than Al 2 O 3 coatings. The formation of fluorination layer surface prevents the coatings from further erosion with plasma gas. Moreover, the etching rate of coatings depended on the fluorination and removing rate of fluoride layer.
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Zhao et al. (2018) studied this question.
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