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Solvothermal modified layers against high temperature corrosion

: Wöllmer, Silke; Förg, Andrea; Schuster, Sebastian; Masset, Patrick J.


Edtmaier, C.:
20th Symposium on Composites 2015 : Selected, peer reviewed papers from the 20th Symposium on Composites, July 1 - 3, 2015, Vienna, Austria
Durnten-Zurich: TTP, 2015 (Materials Science Forum 825-826)
ISBN: 978-3-03835-515-1 (Print)
ISBN: 978-3-03859-300-3 (CD-ROM)
ISBN: 978-3-03826-985-4 (eBook)
Symposium on Composites <20, 2015, Vienna>
Conference Paper
Fraunhofer UMSICHT Oberhausen ()
corrosion protection; High Temperature Corrosion Protection; multilayer; Nickel Based Alloy; solvothermal; thermal spraying; waste incineration plant; Yttria Stabilized Zirkonia

Service and downtimes of waste incineration plants generate high expenses for their operators [1].State of the art is to protect high corrosion exposed components by cladding them with a nickel based alloy. The welded overlay is 2-3 mm thick and very expensive. It needs to be repaired at each service interval. An alternative coating consists of a thermal sprayed multilayer of a nickel based bondcoat and a ceramic topcoat. Thickness and costs of this multilayer are assumed to be in the range of about 20% of the currently used coating. A solvothermal treatment chemically densifies the coating. This leads to a significantly lower porosity whilst improving cohesion and hardness properties. This innovative process leads to a self-healing layer caused by the high temperature waste gas exposition as the driving force.