Thermal barrier coating

Thermal barrier coatings (english thermal barrier coating TBC) are used in industry to reduce the temperature of the material in high temperature applications. An example are new and retrofit gas turbines, in which the coating is applied according to need within the range of a few tenths of a millimeter to millimeters on the blades as well as on other constituents in the so-called hot air path of turbine, such as heat shields and combustor segments.

High temperatures are, for example, in the operation of turbines necessary to increase the efficiency or the efficiency of the turbine. The contrary is the strength of the material at high temperatures. As turbine blade materials can be used at gas temperatures above 1400 ° C because the temperature of the material can be lowered to below 1100 ° C by a heat-insulating layer in which the material still has a sufficiently high strength.

Properties

This coating is a special process, in which, among other things, once ABB was leading applied.

The coating composition has both positive and negative characteristics. Firstly, it is together with the " air cooling system " of the turbines very effective protection against the reached extreme temperatures, on the other hand it requires that the manufacturing absolute dimensional accuracy and the assembly / disassembly of a high degree of tact when dealing with the components because the coating having a ceramic structure which is porous and brittle. Depending on the manufacturing process, this coating is off-white or gray.