Laser surface modification of porous yttria stabilized zirconia against CMAS degradation

摘要: Abstract Here, we present a new combined freeze-casting and laser processing method for the design of yttria-stabilized zirconia (YSZ) based thermal-barrier coatings. YSZ ceramics with unidirectionally-aligned pore channels were created using method. After sintering, top view cross-sectional scanning electron microscopy (SEM) revealed structural features preform, which exhibits 74 ± 2% volume fraction porosity an average channel size 30 ± 3 μm. The measured thermal conductivity this porous structure was 0.27 ± 0.02 W/(m K), is eight times lower than that reported values dense YSZ. Though high beneficial both from response perspective, open could potentially be issue application stand-point when evaluating resistance materials to calcium–magnesium–aluminum–silicon oxide (CMAS) attack. CMAS attack, can originate deposits molten sand, ash, dust, one major causes barrier coating failure. Therefore, surface samples modified process create infiltration. SEM micrographs aided in determining optimum parameters required fully seal treatment. performance original surface-modified compared by conducting infiltration studies. Laser modification shown viable technique significantly reduce