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Degradation mechanisms and microstructural evolution of ZrB2-doped SiC fibers in high-temperature steam environments.

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Title: Degradation mechanisms and microstructural evolution of ZrB2-doped SiC fibers in high-temperature steam environments.
Authors: Xiao, Mengli1,2,3 (AUTHOR), Luo, Han1,2 (AUTHOR) luohan@mail.sic.ac.cn, Zhang, Hangfei1,2,3 (AUTHOR), You, Xiao1,2 (AUTHOR), Qin, Hao1,2 (AUTHOR), Xue, Yudong1,2 (AUTHOR), Liao, Chunjing1,2 (AUTHOR), Chen, Xiaowu1,2 (AUTHOR), Wang, Hongda1,2 (AUTHOR), Chen, Xiangyang4 (AUTHOR), Zhang, Xiangyu1,2 (AUTHOR), Yang, Jinshan1,2 (AUTHOR) jyang@mail.sic.ac.cn, Dong, Shaoming1,2 (AUTHOR)
Source: Ceramics International. Apr2026:Part A, Vol. 52 Issue 9, p12104-12113. 10p.
Subjects: Borosilicates, Oxidation, Molecular dynamics, Ceramic fibers, Microstructure, Crystal grain boundaries, Corrosion inhibitors
Abstract: The high-temperature steam oxidation behavior of SiC fibers plays a crucial role in determining the service performance of SiC/SiC composites. This study systematically investigates the oxidation behavior of ZrB 2 -doped Z-300 fibers under steam exposure at temperatures ranging from 1000 to 1400 °C. Molecular dynamics (MD) simulations demonstrate that ZrB 2 incorporation not only enhances the stability of Si–C bonds but also promotes the preferential adsorption of H 2 O molecules. The role of ZrB 2 as a dopant is further elucidated through comprehensive characterization via TEM, XRD, XPS, and mechanical property analysis. Specifically, ZrB 2 primarily functions as a sacrificial phase, reacting with steam to form B 2 O 3 , which subsequently reacts with SiO 2 produced by SiC oxidation to generate a continuous borosilicate glass layer (B 2 O 3) x (SiO 2) y. This protective glass layer effectively mitigates the diffusion of oxidizing species to a significant extent. However, the protective efficacy of ZrB 2 declines at elevated temperatures due to intrinsic microstructural defects in the SiC fibers and the limited thermal stability of the borosilicate glass above 1200 °C. Future research should focus on minimizing grain boundary defects and developing high-entropy glass phases to extend the operational temperature range of these composites. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:The high-temperature steam oxidation behavior of SiC fibers plays a crucial role in determining the service performance of SiC/SiC composites. This study systematically investigates the oxidation behavior of ZrB 2 -doped Z-300 fibers under steam exposure at temperatures ranging from 1000 to 1400 °C. Molecular dynamics (MD) simulations demonstrate that ZrB 2 incorporation not only enhances the stability of Si–C bonds but also promotes the preferential adsorption of H 2 O molecules. The role of ZrB 2 as a dopant is further elucidated through comprehensive characterization via TEM, XRD, XPS, and mechanical property analysis. Specifically, ZrB 2 primarily functions as a sacrificial phase, reacting with steam to form B 2 O 3 , which subsequently reacts with SiO 2 produced by SiC oxidation to generate a continuous borosilicate glass layer (B 2 O 3) x (SiO 2) y. This protective glass layer effectively mitigates the diffusion of oxidizing species to a significant extent. However, the protective efficacy of ZrB 2 declines at elevated temperatures due to intrinsic microstructural defects in the SiC fibers and the limited thermal stability of the borosilicate glass above 1200 °C. Future research should focus on minimizing grain boundary defects and developing high-entropy glass phases to extend the operational temperature range of these composites. [ABSTRACT FROM AUTHOR]
ISSN:02728842
DOI:10.1016/j.ceramint.2026.01.366