| YAN Yan-qin,QIU Chang-jun,HUANG He,HU Liang-bin,LIU Yan-hong,LI Huai-lin.Effects of Heat Treatment Temperature on Microstructure and Properties of Cr/Al Coatings[J],46(12):78-83 |
| Effects of Heat Treatment Temperature on Microstructure and Properties of Cr/Al Coatings |
| Received:August 15, 2017 Revised:December 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.12.014 |
| KeyWord:multi-arc ion plating magnetron sputtering heat treatment Cr/Al coating microstructure morphology bonding strength |
| Author | Institution |
| YAN Yan-qin |
School of Mechanical Engineering, University of South China, Hengyang , China |
| QIU Chang-jun |
School of Mechanical Engineering, University of South China, Hengyang , China |
| HUANG He |
School of Mechanical Engineering, University of South China, Hengyang , China |
| HU Liang-bin |
School of Mechanical Engineering, University of South China, Hengyang , China |
| LIU Yan-hong |
State Power Investment Corporation Central Research Institute, Beijing , China |
| LI Huai-lin |
State Power Investment Corporation Central Research Institute, Beijing , China |
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| Abstract: |
| The work aims to improve bonding strength of Cr/Al coatings prepared in the method of physical vapor deposition (PVD) and the substrate zirconium alloy, so as to reduce the internal stress and microdefects on the coatings. The Cr/Al coatings were sputtered on the surface of zirconium alloy by multi-arc ion plating and magnetron sputtering. The coating samples were placed and heat treated in 600 ℃ and 800 ℃ protective atmosphere oven for 30 min. Phase composition, surface morphology, cross-sectional morphology and element compositional variation of Cr/Al coatings before and after heat treatment, and peeling morphology of the sheared Cr/Al coatings were analyzed with X-ray diffractometer (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (EDS) and optical microscopy (OM). Bonding strength between untreated coating, coating samples heated treated at 600 ℃ and 800 ℃, and the substrate zirconium alloy were tested with spring tension and compression testing machine. Compared with untreated coating, the coating surfaces heat treated at 600 ℃ and 800 ℃ featured in smoother surface, less surface pores and microdefects. However, the bonding strength between the coatings and the substrate changed slightly. The bonding strength between untreated coating, the coating heat treated at 600 ℃, the coating heat treated at 800 ℃ and the substrate zirconium alloy was 44.07, 44.12 and 44.08 MPa, respectively. After the heat treatment, various Cr-Al alloy phases including AlCr2, Al8Cr5, Al9Cr17, Al9Cr4, and Al86Cr14 appear on the coatings, which contributed to reduction of the defects including surface pores and large particles. The bonding strength between the coatings and substrate changed slightly before and after heat treatment. |
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