直接烧结SiC循环氧化行为的试验研究

doi:10.11902/1005.4537.2021.025

中国腐蚀与防护学报

2022, Vol. 42

Issue (2): 249-257 DOI: 10.11902/1005.4537.2021.025

研究报告

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直接烧结SiC循环氧化行为的试验研究

江荣¹(

), 张悦¹, 张磊成¹, 高希光¹, 宋迎东¹^,²

^1.南京航空航天大学能源与动力学院航空发动机热环境与热结构工业和信息化部重点实验室江苏省航空动力系统重点实验室南京 210016
^2.南京航空航天大学机械结构力学及控制国家重点实验室南京 210016

Experimental Study of Cyclic Oxidation Behavior of Direct-sintered SiC

JIANG Rong¹(

), ZHANG Yue¹, ZHANG Leicheng¹, GAO Xiguang¹, SONG Yingdong¹^,²

^1.Jiangsu Province Key Laboratory of Aerospace Power System, Key Laboratory of Aero-engine Thermal Environment and Structure, Ministry of Industry and Infor-mation Technology, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
^2.State Key Laboratory of Mechanics and Control Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

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摘要:

采用管式炉对直接烧结SiC在1300和1400 ℃静止空气中进行不同循环周期下的循环氧化实验。使用分析天平记录样品质量变化，并使用扫描电镜对氧化产物进行表征以揭示循环氧化机理。结果表明，直接烧结SiC的循环氧化行为由前期接近抛物线氧化行为的氧化增重过程与长时间氧化产生氧化层剥落造成的氧化失重过程组成。循环氧化过程可分为氧化、扩散、开裂、剥落4个阶段，且4个阶段往复进行，最终导致了直接烧结SiC在循环氧化过程中的多层氧化层剥落。随氧化温度的升高，SiC氧化速率增加，且更快进入氧化失重阶段；循环氧化周期越短，越易发生局部剥落行为，循环氧化过程受氧化层开裂及剥落影响越严重；循环周期越长，受氧化层开裂及剥落影响推迟，但容易发生氧化层的整体剥落。

关键词 ：直接烧结SiC, 循环氧化, 循环周期, 氧化温度, 剥落

Abstract：

The cyclic oxidation performance of the direct-sintered SiC was assessed in air at 1300 ℃ with cyclic period of 5 h, and at 1400 ℃ with cyclic period of 1, 3 and 5 h, respectively, meanwhile, the mass change of the sintered SiC vs cycle nunber was measured with analytical balance. Then the morphology evolution and the formed oxide scales of the direct-sintered SiC were characterized by scanning electron microscope. The results indicate that during the cyclic oxidation, the direct-sintered SiC experienced a two-stage process, i.e. in the early stage the sintered SiC presented a course of parabolic mass gain and then turned to a course of mass loss companied by spallation of oxide scale for long-term oxidation. With the increase of cyclic oxidation temperature, the oxidation rate of direct-sintered SiC increases and the mass loss stage emerges more quickly. The shorter the cyclic period is, the easier the spallation of oxide scale takes place, and the cracking and spallation of oxide scale exerts a more serious influence on the cyclic oxidation process. As the increase of cyclic period, the occurrence of cracking and spallation of oxide scale may be postponed, but in that case, the overall spallation of oxide scale seems easy to take place.

Key words： direct-sintered SiC cyclic oxidation cyclic period oxidation temperature spallation

收稿日期: 2021-02-04

ZTFLH:

V23

基金资助:国家科技重大专项(2017-IV-0005-0042)

通讯作者: 江荣 E-mail: rjiang@nuaa.edu.cn

Corresponding author: JIANG Rong E-mail: rjiang@nuaa.edu.cn

作者简介: 江荣，男，1985年生，博士，副教授

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引用本文:

江荣, 张悦, 张磊成, 高希光, 宋迎东. 直接烧结SiC循环氧化行为的试验研究[J]. 中国腐蚀与防护学报, 2022, 42(2): 249-257.
Rong JIANG, Yue ZHANG, Leicheng ZHANG, Xiguang GAO, Yingdong SONG. Experimental Study of Cyclic Oxidation Behavior of Direct-sintered SiC. Journal of Chinese Society for Corrosion and protection, 2022, 42(2): 249-257.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.025 或 https://www.jcscp.org/CN/Y2022/V42/I2/249

图1 样品初始表面形貌和物相分析以及氧化样品宏观形貌与温度循环制度

图2 SiC在1400 ℃不同循环氧化时间下的表面形貌

图3 SiC在1400 ℃下不同循环氧化时间下的氧化层横截面形貌

图4 直接烧结SiC在空气中1400 ℃下周期为1 h的循环氧化动力学曲线

图5 直接烧结SiC在1400 ℃不同循环周期下氧化90 h后氧化层表面形貌

图6 直接烧结SiC在1400 ℃不同循环周期下的循环氧化动力学曲线及初始阶段的拟合曲线

表1 1400 ℃不同循环周期条件下循环氧化实验结果统计

图7 1400 ℃下不同循环周期条件下循环氧化增重达到最高点前的氧化层表面形貌

图 8 直接烧结SiC在不同温度5 h循环周期下循环氧化90 h时表面形貌对比

图9 直接烧结SiC在不同温度下循环氧化动力学曲线

图10 氧化层在存在缺陷前提下受拉伸应力示意图及氧化层开裂之后氧化层与SiC界面上受力情况分析[25]

图11 SiC循环氧化-扩散-开裂-剥落及SiC循环氧化多层氧化层剥落示意图

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