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Vol.43, No.6, 433 ~ 443, 2005
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| Title |
| Mechanical Behavior : Microstructure and Wear Resistance of Al2O3-13 wt.%TiO2 Coatings Plasma-Sprayed Using Nanocrystalline Powders |
| 안지훈 Jee Hoon Ahn , 황병철 Byoung Chul Hwang , 송은필 Eun Pil Song , 이성학 Sung Hak Lee , 김낙준 Nack J. Kim |
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| Abstract |
| Correlation between microstructure and wear resistance of Al2O3-13 wt.%TiO2 coatings plasm-sprayed using nanopowders was investigated in this study. Four types of nanostructured Al2O3-13 wt.%TiO2 coatings were plasma-sprayed on a low-carbon steel substrate by using different critical plasma spray parameters (CPSP), and were compared with an Al2O3-13 wt.%TiO2 coating plasma-sprayed using conventional powders. Microstructural analysis showed that the nanostructured coatings consisted of completely melted region of γ-Al2O3 phase and partly melted region, while the conventional coating consisted mainly of completely melted region of γ-Al2O3, together with some TiO2-rich areas located along splat boundaries. The wear test results revealed that the wear resistance of the nanostructured coatings was three or four times better than that of the conventional coating because the preferential delamination seriously occurred along the TiO2-rich areas in the conventional coating. In the nanostructured Al2O3-13 wt.%TiO2 coatings, bonding between splats was excellent without the TiO2-rich areas, thereby leading to the enhancement of the wear resistance over the conventional coating. |
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| Key Words |
| Plasma spray coating, Nanopowder, Al2O3-TiO2, Wear resistance |
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