In situ study of the oxidation of ZrB2 and ZrB2-SiC materials by monitoring the LIF signal of BO2 radicals

• Published in: Corrosion science Vol. 148; pp. 31 - 38
• Main Authors: Guérineau, V., Julian-Jankowiak, A., Vilmart, G., Dorval, N.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Ltd 01.03.2019; Elsevier BV; Elsevier
• Subjects: A. Ceramic; Air flow; B. Spectroscopy; B.Laser induced fluorescence; C. High temperature corrosion; C. Oxidation; Carbon dioxide; Carbon dioxide lasers; Engineering Sciences; Laser induced fluorescence; Lasers; Materials; Oxidation; Radicals; Refractory materials; Signal monitoring; Silicon dioxide; Vapor phases; Zirconium compounds; C. High temperature corrosion; B. Spectroscopy; C. Oxidation; A. Ceramic; B.Laser induced fluorescence; HIGH TEMPERATURE CORROSION; OXIDATION; ZRB2; CERAMIC; SPECTROSCOPY; UHTC; ZRB2-SIC; LIF; LASER INDUCED FLUORESCENCE
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2018.11.032

•First application of the Laser Induced Fluorescence technique to investigate the in situ oxidation of UHTC samples.•Detection of the BO2 radicals in the gas phase above UHTC materials during an oxidation test up to 1873K.•Determination of the volatile species formed during oxidation.•In situ oxidation mechanisms. In this study, the Laser Induced Fluorescence (LIF) technique is used to detect BO2 radicals in the gas phase above heated ZrB2 and ZrB2-20 vol. % SiC samples in air, in order to provide an in situ and real-time monitoring of their thermal oxidation. Samples are heated up to 1923 K in air flow with a 2 kW CO2 laser. The BO2 fluorescence and the laser transmission signals are monitored throughout the temperature ramp. This technique allows to detect the key steps of the oxidation (silica formation,...) and to propose more precise oxidation mechanisms as a function of temperature.