کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1658387 | 1008338 | 2012 | 6 صفحه PDF | دانلود رایگان |
During process of plasma spraying of alumina with the stable α phase in the as-received powder, metastable γ phase tends to form in the as-deposited coating. In this paper, plasma-sprayed Al2O3 coating was investigated using transmission electron microscopy. In situ formation of γ-Al2O3 nanocrystals was observed in the pre-existing cracks of the as-sprayed Al2O3 coating, which contributes to self-repairing and self-toughening of the Al2O3 coating. Except for the predominant intergranular fracture, the pre-formed γ-Al2O3 nanocrystals would effectively obstruct the crack development in the coating and then the coating fracture toughness is enhanced.
► Pure Al2O3 coating was deposited by plasma spraying.
► In situ formation of γ-Al2O3 nanocrystals was observed in the pre-existing cracks.
► The pre-formed γ-Al2O3 nanocrystals contribute to self-toughening of Al2O3 coating.
Journal: Surface and Coatings Technology - Volume 206, Issue 13, 25 February 2012, Pages 3082–3087