Effect of Temperature on Stress Oxidation Behaviors of 2D C/SiC-BC x Composite in Wet Oxygen Atmosphere
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INTRODUCTION
CARBON fiber-reinforced silicon carbide (C/SiC) composites are good potential candidate materials for a variety of applications such as aerospace, nuclear, aeronautic jet engine, industrial turbine, and braking system.[1–3] However, the poor oxidation resistance of C/SiC composites limits its long-term applications in aero-engine and industrial turbine. Therefore, it is essential to improve the oxidation resistance of C/SiC composites. To achieve this goal, the multilayered selfsealing matrices[4–7] were developed. The B-C ceramic and Si-B-C ceramic were used to modify SiC matrix and created a multilayered matrix by CNRS-SEP and University of Bordeaux-1 in France.[4–7] It revealed that the self-healing matrix could improve the oxidation resistance than that of SiC matrix substantially. Based on the multilayered self-healing matrix, the A400, A410, and A500 series materials were developed,[8] which were tested as seals for F100-PW-229 engine.[9–11] Our previous works reported the fabrication and mechanical properties of 2D C/SiC-BCx composites.[12–15] The oxidation resistance of the 2D C/SiC-BCx composites in static air had been improved remarkably.[12] And the fracture behaviors and fracture mechanism of 2D C/ SiC-BCx composites had been discussed in References 15, 16. The strength distribution and reliability of composites 2D C/SiC-BCx composite were also researched.[15] In many of the applications, such as aerospace and industrial turbine, C/SiC-BCx composites also need to bear stress except for the durations, temperatures, and YONGSHENG LIU, Associate Professor, LITONG ZHANG and LAIFEI CHENG, Professors, and WENBING YANG, Ph.D. Student, are with the Science and Technology on Thermostructure Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, 710072, Shaanxi, P.R. China. Contact e-mails: yongshengliu@ nwpu.edu.cn, [email protected] Manuscript submitted February 16, 2014. Article published online August 14, 2014 METALLURGICAL AND MATERIALS TRANSACTIONS A
oxygen partial pressures et al. The stress was an important factor for the oxidation and life of C/SiC composites.[17,18] Besides, there were many researches and reports on the stress oxidation effects, kinetics, behavior, life, et al. of C/SiC composites.[19,20] Since the BCx self-healing matrix was introduced into C/SiC composites, the stress oxidation behaviors and mechanism of C/SiC-BCx composites should be different from that of C/SiC composites. However, there are no related reports on stress oxidation behavior and mechanism of C/SiC composites in wet oxygen atmosphere. In this work, the effect of temperature on stress oxidation behaviors of 2D C/SiC-BCx composites in wet oxygen atmosphere is investigated. The residual strengths of 2D C/SiC-BCx composites are measured after stress oxidation at different temperatures and times to indicate the effects of stress oxidation on the mechanical properties of the composites. The stress oxidation damage is analyzed according to the microstructure evolution.
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EXPERIMENT PROCEDUR
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