Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5460743 | Journal of Alloys and Compounds | 2017 | 24 Pages |
Abstract
Nuclear vitrification components used in melter pot made of Ni-base superalloys degrade prematurely due to alloy-waste glass interaction and the formation of secondary precipitates. Deposition of cubic yttria stabilized zirconia (c-YSZ) coating has been recommended as a diffusion barrier material to delay or reduce the failure of the alloy and to enable an extended life. In the present work, c-YSZ films have been deposited on Inconel-690 substrate by electron beam evaporation technique at various substrate temperatures from 673Â K to 973Â K. The residual stress in the film surface and at the film/substrate interface was measured using grazing incidence x-ray diffraction (GIXRD) with various incidence angles. It was observed that the residual stress at the film/substrate interface region changes from tensile to compressive when the substrate temperature was increased from 673Â K to 973Â K during deposition. Furthermore, the thermal expansion coefficient (TEC) of Inconel-690 substrate and YSZ film coated Inconel-690 substrate were determined by high temperature (HTXRD) measurement in the temperature range of 298-1273Â K with 100Â K interval. The linear TECs of Inconel-690 and YSZ coated Inconel-690Â at 1273Â K were found to be 1.53Â ÃÂ 10â5Â Kâ1 and 6.04Â ÃÂ 10â6Â Kâ1, respectively.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
A.M. Kamalan Kirubaharan, P. Kuppusami, Sujay Chakravarty, D. Ramachandran, Akash Singh,