Modular coating for flexible gas turbine operation

With today’s continuously increasing demand for flexibility in industrial gas turbines (IGT) operation,

power plant owners are forced to change their operation regime from base load to cyclic operation.

The required coating properties for the two opposite regimes are contrarious and cannot be

counterbalanced with current MCrAlY systems. Furthermore, for each turbine component, as well as

in individual part locations, the loading boundary conditions are different. For optimized component

protection it is therefore of interest to produce coatings with flexible and individually tailored properties.

In this context, ALSTOM developed an Advanced Modular Coating Technology (AMCOTEC^®), which is based

on several powder constituents and a new application method, allowing in-situ compositional changes.

With this approach, coating properties, such as oxidation, corrosion, erosion resistance, cyclic lifetime etc.

can be adjusted for individual component types and areas. This also includes production of graded coatings,

without changing the chemistry of powder fractions.