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无机材料学报

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1250℃热处理对CVI2DSiC/SiC力学性能退化的影响

高艺菲1, 由博杰1,3, 王玉金2, 高祥云1,4, 周心悦1, 张毅1,5   

  1. 1.西北工业大学 超高温结构复合材料重点实验室,西安 710072;
    2.哈尔滨工业大学,哈尔滨 150001;
    3.中国飞机强度研究所,西安 710065;
    4.西安航空制动科技有限公司,西安 713106;
    5.西北工业大学宁波研究院,宁波 315040
  • 收稿日期:2026-07-08 修回日期:2026-09-25
  • 通讯作者: 张毅, 副研究员. E-mail: zhangyit@nwpu.edu.cn
  • 作者简介:高艺菲(2003-), 女, 硕士研究生. E-mail: yifeigao@mail.nwpu.edu.cn
  • 基金资助:
    哈尔滨工业大学材料与结构精密焊接与连接全国重点实验室开放课题(SWJ-25M-12); 四川省科技计划省院省校合作项目(2026YFHZ0248); 宁波市甬江人才工程(创新人才)(2025A-157-G); 陕西省创新能力支撑计划(2025RS-CXTD-025)

Degradation of CVI 2D SiC/SiC Composites after Heat Treatment in Air at 1250 ℃

GAO Yifei1, YOU Bojie1,3, WANG Yujin2, GAO Xiangyun1,4, ZHOU Xinyue1, ZHANG Yi1,5   

  1. 1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an 710072, China;
    2. Harbin Institute of Technology, Harbin 150001, China;
    3. AVIC Aircraft Strength Research Institute, Xi'an 710065, China;
    4. Xi'an Aviation Brake Technology Co., Ltd, Xi'an 713106, China;
    5. Ningbo Institute of NPU, Ningbo 315040, China
  • Received:2026-07-08 Revised:2026-09-25
  • Contact: ZHANG Yi, associate professor. E-mail: zhangyit@nwpu.edu.cn
  • About author:Gao Yifei (2003-), female, Master candidate. E-mail: yifeigao@mail.nwpu.edu.cn
  • Supported by:
    Open Research Fund of the State Key Laboratory of Precision Welding & Joining of Materials and Structures (SWJ-25M-12); Sichuan Science and Technology Program for Provincial Institute-University Cooperation Project (2026YFHZ0248); Ningbo Yongjiang Talent Program for Innovative Talents (2025A-157-G); Shaanxi Innovation Capability Support Program (2025RS-CXTD-025)

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摘要： 采用国产Cansas 3203 SiC纤维研制SiC/SiC复合材料是推动该材料应用于航空发动机关键静止热端部件的重要技术方向。掌握SiC/SiC在其极限使用温度(1250 ℃)下的力学性能退化规律,对指导热端部件结构设计和服役寿命评估具有重要意义。本研究以化学气相渗透工艺制备的2D SiC/SiC为对象,系统分析其在1250 ℃空气热处理后的力学性能退化规律,并基于保持率变化讨论不同载荷模式下的氧化损伤敏感性。研究表明,1250 ℃空气长时热处理后,2D SiC/SiC不同力学性能退化规律以及损伤敏感性存在明显差异：拉伸强度在热处理300 h后保持率降至24.72%,面内剪切强度在热处理200 h后保持率降至40.07%,长时氧化后累积退化较为显著;压缩强度和层间剪切强度对氧化初期损伤更敏感,热处理100 h后保持率分别为34.50%和50.43%,热处理300 h后分别为49.53%和62.04%;弯曲强度和断裂韧性在热处理300 h后保持率分别为78.67%和74.70%。引入等效界面载荷传递能力修正系数后,残余拉伸强度模型在热处理200 h和300 h后的相对偏差分别为24.18%和-4.06%,长时氧化阶段材料强度演化不仅受SiC氧化层生长控制,还与界面载荷传递能力下降及复合材料尺度结构损伤有关。该结果可为SiC/SiC静止热端部件结构设计提供多模式力学依据。本文数据集可在https://www.doi.org/10.57760/sciencedb.jim.XXXXX中访问获取。

关键词: 化学气相渗透, 2D SiC/SiC, 热处理, 力学性能, 退化规律

Abstract: Developing SiC/SiC composites reinforced with domestic Cansas 3203 SiC fibers is an important technical route for promoting their application in key stationary hot-section components of aero-engines. Understanding the mechanical degradation behavior of SiC/SiC composites at the upper service temperature of Cansas 3203 SiC fibers (1250 °C) is essential for guiding the structural design and service-life assessment of hot-section components. This study focused on 2D SiC/SiC composites fabricated by chemical vapor infiltration, systematically analyzed their mechanical degradation behavior after heat treatment in air at 1250 °C, and discussed oxidation-damage sensitivity under different loading modes based on changes in retention rates. Results show that, after long-term heat treatment in air at 1250 °C, different mechanical properties of 2D SiC/SiC composites exhibit distinct degradation behaviors and damage sensitivities. The tensile-strength retention rate decreases to 24.72% after heat treatment in air at 1250 °C for 300 h, while the in-plane shear strength retention rate decreases to 40.07% after 200 h of heat treatment, indicating pronounced cumulative degradation after long-term oxidation. Compressive strength and interlaminar shear strength are more sensitive to initial oxidation damage, with retention rates of 34.50% and 50.43%, respectively, after 100 h of heat treatment, and corresponding values of 49.53% and 62.04% after 300 h of heat treatment. Flexural strength and fracture toughness show retention rates of 78.67% and 74.70%, respectively, after 300 h of heat treatment. After incorporating an equivalent correction coefficient for interfacial load-transfer capability into the residual tensile-strength model, the relative deviations after 200 h and 300 h of heat treatment are 24.18% and -4.06%, respectively. Strength evolution during long-term oxidation is not only controlled by SiC oxide-layer growth but is also associated with reduced interfacial load-transfer capability and composite-scale structural damage. These results provide a mechanical basis under multiple loading modes for the structural design of SiC/SiC stationary hot-section components.

Key words: chemical vapor infiltration, 2D SiC/SiC composites, heat treatment, mechanical properties, degradation behavior

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