Plasma Sprayed 4-Phase Ceramic Abradable Seal Coatings and their Thermal Shock Resistance on Nickel-Based Superalloy

Abstract:

Novel 4-phase ceramic abradable seal coatings have been prepared by plasma spray. The as-prepared coatings were characterized by SEM, EDS and XRD. The results showed that the 4-phase ceramic abradable coating exhibited porous structures and had good adhesion with the bond coat. The ZrO₂ and Al₂O₃ in the coating existed in the form of tetragonal-ZrO₂ and α-Al₂O₃, respectively. The result of thermal shock test revealed that compared with the 3-phase abradable coating, the thermal shock life of the 4-phase abradable coating had increased tenfold to 1900~2000 cycles from 100~200 cycles. The reason is owing to the reduction of oxygen partial pressure and thermal stresses at the top/bond coat interface due to the addition of the fourth nanoAl₂O₃ phase.

• Periodical: Advanced Materials Research (Volume 1058)
• Pages: 274-278
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1058.274
• Online since: November 2014
• Authors: Jun Guo Gao*, Feng Lu, Meng Qiu Guo
• Keywords: Ceramic Abradable Seal Coatings, Plasma Spray, Thermal Shock Resistance

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