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Formation of diffusion barrier coating on superalloy 690 substrate and its stability in borosilicate melt at elevated temperature
Authors:R.S. Dutta  C. Yusufali  B. Paul  S. Majumdar  P. Sengupta  R.K. Mishra  C.P. Kaushik  R.J. Kshirsagar  U.D. Kulkarni  G.K. Dey
Affiliation:1. Materials Science Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400 085, India.;2. Materials Processing Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400 085, India.;3. Waste Management Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400 085, India.;4. High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400 085, India.;1. Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk 790784, South Korea;2. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk 790784, South Korea;3. Pacific Northwest National Laboratory (PNNL), Richland, WA 99354, USA;1. School of Mechanical, Aerospace and Civil Engineering (MACE)/University of Manchester, Pariser Building, F-floor, Manchester M13 9PL, UK;2. Henry Mosley Imaging Facility, Material Science Centre, University of Manchester, Manchester M13 9PL, UK;3. Centro de Investigación y Estudios Avanzados del IPN (CINVESTAV), Unidad Saltillo. Carretera Saltillo-Monterrey km 13.5, 25900 Ramos Arizpe, Coahuila, Mexico;1. CEA Marcoule, DTCD/SECM/LCLT, BP 17171, 30207 Bagnols-sur-Cèze Cedex, France;2. Geosciences Dept., Mines-ParisTech, 35 Rue St-Honoré, 77305 Fontainebleau, France;1. State Key Lab of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China;2. Wuhan Iron and Steel Corporation (WISCO), Wuhan 430083, China;1. Analytical and Testing Center, Southwest University of Science and Technology, Mianyang 621010, PR China;2. State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010, PR China;1. Department of Material Science and Engineering, Missouri University of Science and Technology, 101 Straumanis-James Hall, 401 W. 16th St., Rolla, MO 65409-0330, USA;2. MO-SCI Corporation, 4040 HyPoint North, Rolla, MO 65401, USA
Abstract:Aluminized and thermally oxidized superalloy 690 substrates forming Al2O3 layer on (NiCr)Al + Cr5Al8 types aluminides and bare substrates were exposed in sodium borosilicate melt at 1248 K for 192 h. SEM–EDXS analysis along the cross-section of bare substrate with adhered glass revealed formation of a continuous, thick Cr2O3 layer at the substrate/glass interface due to its low solubility in borosilicate melt. XRD on aluminide coated and thermally oxidized specimen revealed existence of Al2O3 along with NiAl and Cr5Al8 type phases after the exposure in borosilicate melt. SEM–EDXS analysis along the cross-section of aluminide coated and thermally oxidized sample with adhered glass indicated good stability of coating in borosilicate melt without any phase formation at the coating/glass interface. However, some Al enrichment in glass phase adjacent to interface was noticed without any significant Ni or Cr enrichment.
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