| Abstract: |
Recent development of plasma spraying with liquid feedstocks enabled deposition of novel thermal barrier coatings (TBCs) with top-coats incorporating various desirable features, such as columnar microstructure or ultrafine porosity. Moreover, different materials may be relatively easily combined e.g. by alternating feedstocks in the feedline or using feedstock mixtures. Due to the small size of the splats when compared to the conventional TBCs deposited from coarse dry powders, high number of interfaces can fit within the given coating thickness. Also, coatings with gradient change of chemistry/microstructure towards the free-surface can be prepared, which may be potentially beneficial for example to mitigate stresses at the macroscopic interfaces between individual layers (typically bond-coat/top-coat or within layered top-coat). In this contribution, examples of several novel TBCs deposited by hybrid water/argon-stabilized plasma torch will be presented and discussed in terms of the achievable microstructures and their implications on thermal cycling properties.
|
|
