Solvothermal Modified Layers against High Temperature Corrosion

Abstract:

Service and downtimes of waste incineration plants generate high expenses for their operators. 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 10% 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.

• Periodical: Materials Science Forum (Volumes 825-826)
• Pages: 621-627
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.825-826.621
• Online since: July 2015
• Authors: Silke Wöllmer*, Andrea Förg, Sebastian Schuster, Patrick J. Masset
• Keywords: Corrosion Protection, High Temperature Corrosion Protection, Multilayer, Nickel Based Alloy, Solvothermal, Thermal Spraying, Waste Incineration Plant, Yttria Stabilized Zirconia

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