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Vol.43, No.5, 374 ~ 382, 2005
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| Title |
| Microstructure and Wear Resistance of STS 316 Blend Coatings Fabricated by Atmospheric Plasma Spraying |
| 송은필 Eun Pil Song , 황병철 Byoung Chul Hwang , 이성학 Sung Hak Lee , 김낙준 Nack J. Kim , 김현태 Hyun Tae Kim , 안지훈 Jee Hoon Ahn |
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| Abstract |
| The objective of this study was to investigate the correlation between microstructure and the wear resistance of stainless steel (STS) 316 blend coatings applicable to cylinder bores. STS 316 spray powders were mixed with 0, 10, 20, and 30 wt.% of Al₂O₃_(-)ZrO₂ powders, and then were sprayed on a low-carbon steel substrate by atmospheric plasma spraying. Microstructural analysis of the coatings showed that iron oxides were formed in the austenitic matrix by oxidation during spraying for the STS 316 coating, while Al₂O₃_(-)ZrO₂ oxides were additionally formed in the matrix for the blend coatings. The hardness and wear test results revealed that the blend coatings showed the better hardness and wear resistance than the STS 316 coating and that the hardness and wear resistance increased with increasing volume fraction of total oxides. However, the main wear mode changed from abrasive wear to delamination wear because of cracking of oxides and separation of oxide/matrix interfaces as the volume fraction of total oxides increased. This led to the slight enhancement of wear resistance in the blend coating having the highest volume fraction of total oxides, although its hardness was much higher than that of the other blend coatings. (Received December 28, 2004) |
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| Key Words |
| Atmospheric plasma spraying, STS 316 blend coating, Wear resistance, Al2O3-ZrO2 oxide |
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