Effect of heat treatment in air on bonding strength and micro-structure of Al2O3-13 wt % TiO2/NiCrAl coating prepared by air plasma-spray process
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- 作者：Guowei Wang ; Zehua Zhou ; Zehua Wang…
- 刊名：Protection of Metals and Physical Chemistry of Surfaces
- 出版年：2016
- 出版时间：November 2016
- 年：2016
- 卷：52
- 期：6
- 页码：1064-1069
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Tribology, Corrosion and Coatings; Materials Science, general; Metallic Materials; Inorganic Chemistry; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation of Materials;
- 出版者：Pleiades Publishing
- ISSN：2070-206X
- 卷排序：52
文摘
According to the principle of plasma spraying, air plasma spraying Al2O3-13 wt % TiO2/NiCrAl coating (AT13) on Q235 steel-substrate have some important disadvantages of high porosity, poor adhesive to substrate and low cohesive within the coating. Owing to such weaknesses, an enhancing densification and improving bonding of plasma-sprayed AT13 with an appropriate post air heat treatment is an effective method. On the basis of our final experimental results, post air heating treatment could improve the bonding strength and micro-structure of AT13. The AT13 shows the highest bonding strength and lowest Porosity when heating up to 560°C for 6 hours. Such performances may be because the re-crystallizing, reaction-diffusion of element diffusion and compressive stress of transitional layer. However, air heating temperature higher than 560°C led to the decline of the bonding strength. The excessive oxidizing products and compressive stress of oversized transitional layer could be contributed to the phenomenon.