Mini-SiCf/SiC复合材料长时高温下的力学性能演变

doi:10.15541/jim20250031

摘要/Abstract

摘要： 连续碳化硅纤维增强碳化硅复合材料(SiC_f/SiC)因其优异的力学性能和耐高温特性, 已广泛应用于航空发动机热端部件。为了确保SiC_f/SiC复合材料部件在服役过程中的安全性, 研究其在高温长时间下的力学性能演变显得尤为重要。本研究采用Cansas-II SiC纤维制备了具有BN界面的mini-SiC_f/SiC复合材料, 在1100、1200、1350 °C温度下, 分别进行5、10、50、100、200 h的热处理, 以探究高温长时热处理对mini-SiC_f/SiC复合材料力学性能的影响。研究结果表明：在1100 °C下, 热处理对mini-SiC_f/SiC复合材料的力学性能未产生显著影响, 各阶段对力学性能的贡献占比几乎保持不变。在1200 °C下, 短时间热处理对于mini-SiC_f/SiC复合材料的作用不明显, 其拉伸强度未显著变化。然而, 长时间热处理会导致SiC纤维损伤, 从而降低复合材料的拉伸强度。在1350 °C下, 热处理显著改善了BN界面性能, 但会导致SiC纤维损伤严重, 显著降低mini-SiC_f/SiC复合材料的力学性能, 且随着热处理时间增加, 纤维损伤程度加深, 复合材料力学性能持续恶化。

关键词: Cansas-II SiC纤维, mini-SiC_f/SiC复合材料, 热处理, 声发射, 饱和基体裂纹间距

Abstract: Continuous silicon carbide fiber reinforced silicon carbide composites (SiC_f/SiC) are widely utilized in the hot-end components of aero engines due to their exceptional properties and high-temperature resistance. To ensure the safety and reliability of SiC_f/SiC composite parts during service, it is crucial to investigate the evolution of their mechanical properties under prolonged high-temperature exposure. In this study, mini-SiC_f/SiC composites with BN interface were fabricated using Cansas-II SiC fibers. These mini-SiC_f/SiC composites underwent heat treatment at 1100, 1200, and 1350 °C for durations of 5, 10, 50, 100, and 200 h, respectively, to examine the effects of high-temperature and long-term heat treatment on their mechanical properties and microstructure. The results show that at 1100 °C, heat treatment has no significant impact on the mini-SiC_f/SiC composites. The mechanical properties remain largely unchanged, and the contribution fractions of each stage to the overall mechanical performance remain consistent. At 1200 °C, short-term heat treatment shows minimal effects on the mini-SiC_f/SiC composites, with no notable change in tensile strength, However, prolonged heat treatment leads to damage in the SiC fibers, thereby decreasing its tensile strength. At 1350 °C, heat treatment significantly improves the properties of the BN interface but causes severe damage to the SiC fibers, resulting in a marked decline in the mechanical properties of the mini composites. As the heat treatment duration increases, the extent of fiber damage intensifies, leading to a continuous deterioration in the mechanical performance of the composites.

Key words: Cansas-II SiC fiber, mini-SiC_f/SiC composites, heat treatment, acoustic emission, saturated matrix crack spacing

中图分类号:

TB332

陈斌, 任科, 王一光. Mini-SiC_f/SiC复合材料长时高温下的力学性能演变[J]. 无机材料学报, DOI: 10.15541/jim20250031.

CHEN Bin, REN Ke, WANG Yiguang. Evolution of Mechanical Properties of mini-SiC_f/SiC Composites at High Temperatures over a Long Period of Time[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20250031.

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