Home > Publications database > Aging of atmospherically plasma sprayed chromium evaporation barriers > print |
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100 | 1 | _ | |a Vassen, Robert |0 P:(DE-Juel1)129670 |b 0 |e Corresponding author |
245 | _ | _ | |a Aging of atmospherically plasma sprayed chromium evaporation barriers |
260 | _ | _ | |a Amsterdam [u.a.] |c 2016 |b Elsevier Science |
336 | 7 | _ | |a Journal Article |b journal |m journal |0 PUB:(DE-HGF)16 |s 1458129466_32443 |2 PUB:(DE-HGF) |
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520 | _ | _ | |a Chromium evaporation barriers are frequently used in solid oxide fuel cells to protect the porous cathode from chromium poisoning. Volatile chromium species are generated at the operation temperature of about 600–900 °C in a humid atmosphere for chromia scale forming steels as interconnect materials. In order to reduce this effect, barrier coatings are applied, often by atmospheric plasma spraying. However, also in these coatings microstructural changes as densification and in parallel formation of large pores have been observed. In order to clarify these mechanisms plasma sprayed Mn1.0 Co1.9Fe0.1O4 (“MCF”) are deposited on ferritic steels and furthermore coated with a perovskite based contact layer as used in stack build-up. These coatings are annealed in air up to 1000 h and the microstructural changes and bending of the samples are studied. The results show increasing bending with increasing aging time. High temperature curvature measurements indicate that the amount of bending is not significantly dependent on temperature. As an explanation the creep deformation of the substrate/coating system at high temperatures due to compressive stress levels in the coating is given. The origin of the stress is related to phase changes in combination with the oxidation of the coatings. In addition, interdiffusion and densification processes are discussed. |
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700 | 1 | _ | |a Marcano, D. |0 P:(DE-Juel1)159408 |b 2 |u fzj |
700 | 1 | _ | |a Menzler, N. H. |0 P:(DE-Juel1)129636 |b 3 |u fzj |
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700 | 1 | _ | |a Guillon, Olivier |0 P:(DE-Juel1)161591 |b 7 |
773 | _ | _ | |a 10.1016/j.surfcoat.2016.02.005 |g Vol. 291, p. 115 - 122 |0 PERI:(DE-600)1502240-7 |p 115 - 122 |t Surface and coatings technology |v 291 |y 2016 |x 0257-8972 |
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