Solution combustion synthesis of calcia-magnesia-aluminosilicate powder and its interaction with yttria-stabilized zirconia and co-doped yttria-stabilized zirconia.

Lakshmi, PG and Balaji, N and Anil Kumar, K and Ananthapadmanabhan, PV and Unnikrishnan, G and Senthil Kumar, S and Aruna, ST (2019) Solution combustion synthesis of calcia-magnesia-aluminosilicate powder and its interaction with yttria-stabilized zirconia and co-doped yttria-stabilized zirconia. Ceramic International, 45 (15). pp. 18255-18264. ISSN 18255–18264

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Abstract

Thermal Barrier Coatings (TBCs) play a significant role in improving the efficiency of gas turbines by increasing their operating temperatures. The TBCs in advanced turbine engines are prone to silicate particles attack while operating at high temperatures. The silicate particles impinge on the hot TBC surfaces and melt to form calciamagnesia-aluminosilicate (CMAS) glass deposits leading to coating premature failure. Fine powder of CMAS with the composition matching the desert sand has been synthesized by solution combustion technique. The present study also demonstrates the preparation of flowable yttria-stabilized zirconia (YSZ) and cluster paired YSZ (YSZLn2O3, Ln =Dy and Gd) powders by single-step solution combustion technique. The as-synthesized powders have been plasma sprayed and the interaction of the free standing TBCs with CMAS at high-temperatures (1200 °C, 1270 °C and 1340 °C for 24h) has been investigated. X-ray diffraction analysis of CMAS attacked TBCs revealed a reduction in phase transformation of tetragonal to monoclinic zirconia for YSZ-Ln2O3 (m-ZrO2: 44%) coatings than YSZ (m-ZrO2: 67%). The field emission scanning electron microscopic images show improved CMAS resistance for YSZ-Ln2O3 coatings than YSZ coatings.

Item Type:	Article
Subjects:	RENEWABLE ENERGY > Thermal Energy CHEMISTRY AND MATERIALS > Chemistry and Materials (General) CHEMISTRY AND MATERIALS > Composite Materials CHEMISTRY AND MATERIALS > Metals and Metallic Materials
Depositing User:	Mrs SK Pratibha
Date Deposited:	23 Nov 2021 11:43
Last Modified:	23 Nov 2021 11:43
URI:	http://nal-ir.nal.res.in/id/eprint/13322

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