In situ Formed α-Al2O3 Nanocrystals Repaired the Preexisting Microcracks in Plasma-Sprayed Al2O3 Coating via Stress-Induced Phase Transformation
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- 作者：Kai Yang ; Jingwei Feng ; Jian Rong ; Chenguang Liu…
- 关键词：α ; Al2O3 nanocrystals ; Al2O3 coating ; plasma spraying ; stress ; induced phase transformation ; transmission electron microscopy (TEM)
- 刊名：Journal of Thermal Spray Technology
- 出版年：2016
- 出版时间：February 2016
- 年：2016
- 卷：25
- 期：3
- 页码：518-525
- 全文大小：2,427 KB
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Jingwei Feng (1) (3)
Jian Rong (1) (2)
Chenguang Liu (1) (2)
Shunyan Tao (1) (2)
Chuanxian Ding (1) (2)
1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 201899, People’s Republic of China
2. The Key Laboratory of Inorganic Coating Materials, Chinese Academy of Sciences, Shanghai, 201899, People’s Republic of China
3. Inorganic Materials Analysis and Testing Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, People’s Republic of China - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Surfaces and Interfaces and Thin Films
Tribology, Corrosion and Coatings
Materials Science
Characterization and Evaluation Materials
Operating Procedures and Materials Treatment
Analytical Chemistry - 出版者：Springer Boston
- ISSN：1544-1016
文摘
In the present study, the phase composition and generation mechanism of the nanocrystals located in the microcracks of plasma-sprayed Al2O3 coating were reevaluated. The Al2O3 coatings were investigated using transmission electron microscopy and x-ray diffraction. We supply the detailed explanations to support the new viewpoint that in situ formation of α-Al2O3 nanocrystals in the preexisting microcracks of the as-sprayed Al2O3 coating may be due to the stress-induced phase transformation. Owing to the partially coherent relationship, the phase interfaces between the α-Al2O3 nanocrystals with the preferred orientation and the γ-Al2O3 matrix may possess better bonding strength. The α-Al2O3 nanocrystals could repair the microcracks in the coating, which further strengthens grain boundaries. Grain boundary strengthening is beneficial to the coating fracture toughness enhancement. Keywords α-Al2O3 nanocrystals Al2O3 coating plasma spraying stress-induced phase transformation transmission electron microscopy (TEM)