| LI Lin-bo,LUO Hong-jie,DU Hao,REN Yu-peng,QIU Xiang,XIONG Tian-ying.Influence of Alumina Content on Apparent Morphology and Microstructure of Cold Sprayed Al-Al2O3 Composite Coatings[J],51(1):303-310 |
| Influence of Alumina Content on Apparent Morphology and Microstructure of Cold Sprayed Al-Al2O3 Composite Coatings |
| Received:February 02, 2021 Revised:May 16, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2022.01.033 |
| KeyWord:cold spray composite coating Al2O3 apparent morphology roughness microstructure |
| Author | Institution |
| LI Lin-bo |
Northeastern University, Shenyang , China |
| LUO Hong-jie |
Northeastern University, Shenyang , China |
| DU Hao |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China |
| REN Yu-peng |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China |
| QIU Xiang |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China |
| XIONG Tian-ying |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China |
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| Abstract: |
| By changing the addition amount of alumina in the raw material powder, this paper aims to investigate the influence of the change of alumina content on the morphology and microstructure of cold-sprayed Al-Al2O3 composite coatings, which provides a reference for preparation of cold-sprayed metal/ceramic composite coating and optimization of structural properties. The commercial pure Al powder and Al2O3 powder are mixed in different proportions, and the Al-Al2O3 composite coatings with different Al2O3 content are prepared on the surface of Q235 steel by cold spraying technology. The effect of Al2O3 content on morphology and microstructure of coatings are investigated by X-ray diffractometer, scanning electron microscopy, laser confocal microscopy and optical microscopy. The phase composition of the coating does not change with the increase of Al2O3 content. However, the addition of Al2O3 particles can promote the deformation of Al particles, eliminate the pits and protrusions on the surface of the coating, and improve the surface flatness of the coating. The surface roughness of the coating decreases from 13.5 μm to 6.7 μm. With the increase of Al2O3 content, the tamping and embedding effect of Al2O3 particles enhance the mechanical interlocking between the coating and substrate, and the porosity of the coating decreases from 3.59% to 1.25%. Al2O3 particles can also significantly increase the thickness of the coating, and the thickness of Al-50%Al2O3 composite coating is up to 3.56 mm, while that of pure Al coating is only 1.82 mm. Nevertheless, increasing the content of Al2O3 in the feedstock powder has no obvious effect on improving the deposition efficiency of Al2O3 particles, and will also lead to the breaking of Al2O3 particles in the coating. In conclusion, the addition of Al2O3 particles can effectively improve the surface flatness and thickness of the coating, promote the deformation of metal particles, the densification of the coating and the bonding between the coating and the substrate. However, the increase of Al2O3 content has little effect on the deposition efficiency, and will also increase the breaking degree of Al2O3 particles inside the coating. |
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