| QI Xiao-xiao,WANG Wei,WANG Li-li.Preparation of Electrophoresis Co-deposition NiCoCrAlY Adhesive Layer and Its Resistance to High Temperature Oxidation[J],45(4):149-155 |
| Preparation of Electrophoresis Co-deposition NiCoCrAlY Adhesive Layer and Its Resistance to High Temperature Oxidation |
| Received:November 10, 2015 Revised:April 20, 2016 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.04.025 |
| KeyWord:electrophoretic deposition Nickel-based heat-resistant alloy K17 NiCoCrAlY bonding coating high temperature oxidation element diffusion α-Al2 O3 |
| Author | Institution |
| QI Xiao-xiao |
Department of Materials, Shanghai University of Engineering Sciences, Shanghai , China |
| WANG Wei |
Department of Materials, Shanghai University of Engineering Sciences, Shanghai , China |
| WANG Li-li |
Department of Materials, Shanghai University of Engineering Sciences, Shanghai , China |
|
| Hits: |
| Download times: |
| Abstract: |
| Objective To analyze and study the law of diffusion and interface reaction between Ni-base alloy and the adhesive layer, and its impact on high temperature oxidation resistance and working life of the thermal barrier coating. Methods NiCoCrAlY bonding coating was prepared on the surface of K17 Nickel-based heat-resistant alloy by electrophoretic co-deposition and vacuum densifying treatment. The high temperature oxidation resistance experiment was carried out at 1000 ℃ for 100 h, and the diffusion law of alloying elements in the NiCoCrAlY bonding coating during oxidation at high temperature was analyzed by XRD, SEM and EDS. Results The high temperature oxidation kinetic curves showed that the oxidation rate of NiCoCrAlY bonded coating prepared by 100 h oxidation was 17. 2134 mg / cm2 , which was much lower than that of K17 Nickel-based heat-resistant alloy. SEM and EDS analysis of the diffusion of NiCoCrAlY bonding coating in the process of high temperature oxidation of alloy elements showed that Ni was diffused from the coating to the substrate, Co and Cr spread out, while Al diffused at the interface. The adhesive layer was uniform and dense after vacuum densifying process, and the adhesive layer was mainly composed of Ni3 Al, Al3 Y5 O12 , Cr23 C6 and α-Al2 O3 . Conclusion The high temperature oxidation resistance of NiCoCrAlY bonding coating was higher than that of K17 Nickelbased heat-resistant alloy. In the process of high temperature oxidation, the oxidation resistance of NiCoCrAlY bonding layer was increased by α-Al2 O3 oxidation film. Ti mainly came from defects of the substrate, with the high temperature oxidation, the outward diffusion of energy needed by the matrix was gained and TiO was simultaneously generated by reacting with oxygen, leading to easy generation of foam-like substance on the surface of the adhesive layer. The diffusion of Ti had certain impact on the density and uniformity of the adhesive layer. |
| Close |
|
|
|