Investigation of Thermal-Barrier Coatings of the Y–Al–O System Using Synchrotron Radiation

• Published in: Surface investigation, x-ray, synchrotron and neutron techniques x-ray, synchrotron and neutron techniques, 2023-04, Vol.17 (2), p.440-444
• Main Authors: Nazarov, A. Yu, Vardanyan, E. L., Maslov, A. A., Nikolaev, A. A., Ramazanov, K. N., Khusainova, A. M., Shmakov, A. N.
• Format: Article
• Language: English
• Subjects: Aluminum; Arc deposition; Chemistry and Materials Science; Coatings; Crystallization; Heating; Intermetallic compounds; Materials Science; Phase composition; Phase stability; Phase transitions; Surfaces and Interfaces; Synchrotron radiation; Synchrotrons; Thermal barrier coatings; Thin Films; Yttrium; Yttrium oxide
• ISSN: 1027-4510; 1819-7094
• DOI: 10.1134/S1027451023020349

A thermal-barrier coating based on the Y–Al–O system is studied using synchrotron radiation. The coating is deposited on molybdenum samples by vacuum-arc deposition from two single-component aluminum and yttrium cathodes. Synchrotron radiation is used to study the phase stability of the coating upon heating the sample to 1500°C in vacuum. The coating after deposition has an amorphous structure; its crystallization occurs when the temperature reaches 1160–1170°C; no other phase transformations are found in the coating during heating. The qualitative phase composition of the coating is determined, and the diffraction measurements show no microstresses are present in the coating. Based on the results of the studies, a new method for the synthesis of thermal-barrier coatings based on the Y–Al–O system is developed; the resulting coating consists of oxides YAlO 3 (mainly), Y 2 O 3 , and YAl 2 intermetallic compound.