热震对包覆ZrB2-SiC-La2O3/SiC涂层渗硅石墨力学性能的影响

doi:10.11902/1005.4537.2020.046

中国腐蚀与防护学报

2021, Vol. 41

Issue (1): 29-35 DOI: 10.11902/1005.4537.2020.046

研究报告

本期目录 | 过刊浏览

热震对包覆ZrB₂-SiC-La₂O₃/SiC涂层渗硅石墨力学性能的影响

任岩¹^,², 钱余海¹(

), 张鑫涛¹^,², 徐敬军¹, 左君¹, 李美栓¹

^1.中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016
^2.中国科学技术大学材料科学与工程学院沈阳 110016

Effect of Thermal Shock on Mechanical Properties of Siliconized Graphite with ZrB₂-SiC-La₂O₃/SiC Coating

REN Yan¹^,², QIAN Yuhai¹(

), ZHANG Xintao¹^,², XU Jingjun¹, ZUO Jun¹, LI Meishuan¹

^1.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

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摘要:

采用涂刷法和包埋法在渗硅石墨基体表面制备了双层结构的ZrB₂-SiC-La₂O₃/SiC防护涂层，与表面无包覆涂层的渗硅石墨作对比，采用三点弯曲实验方法研究了热震对其力学性能的影响。结果表明，1500 ℃到室温之间循环热震10次后，表面无包覆涂层的样品单位面积氧化失重为52.1 mg/cm²，弯曲强度保持率仅为52.0%；而包覆涂层样品单位面积氧化增重为5.6 mg/cm²，弯曲强度保持率达78.5%，包覆ZrB₂-SiC-La₂O₃/SiC涂层的样品热震后能保持良好的力学性能。在热震过程中ZrB₂-SiC-La₂O₃/SiC涂层氧化生成的氧化层可有效地保护石墨基体不被氧化，避免了样品内部各种缺陷的产生，从而提高了其弯曲强度。

关键词 ：石墨, 超高温陶瓷涂层, 热震, 弯曲强度

Abstract：

A ZrB₂-SiC-La₂O₃/SiC dual-layer coating was prepared on siliconized graphite by the combination of slurry method and pack cementation. The mechanical properties of the coated siliconized graphite before and after thermal shock were investigated and compared with the bare siliconized graphite. The mass loss was observed and its value of per unit area of the bare siliconized graphite was 52.1 mg/cm², and the flexural strength retention was only 52.0% after thermal shock test from 1500 ℃ to room temperature for 10 cycles, while they were 5.6 mg/cm² and 78.5% for the coated ones, respectively. The high strength retention of the coated siliconized graphite after thermal shock could be attributed to the formation of a protective oxide scale on its surface, which protected the graphite substrate from oxidation and avoided the formation of defects in the interior regions of the coated siliconized graphite.

Key words： graphite ultrahigh temperature ceramic coating thermal shock flexural strength

收稿日期: 2020-03-13

ZTFLH:

TB321

基金资助:国家自然科学基金(51571203)

通讯作者: 钱余海 E-mail: yhqian@imr.ac.cn

Corresponding author: QIAN Yuhai E-mail: yhqian@imr.ac.cn

作者简介: 任岩，男，1993年生，博士生

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引用本文:

任岩, 钱余海, 张鑫涛, 徐敬军, 左君, 李美栓. 热震对包覆ZrB₂-SiC-La₂O₃/SiC涂层渗硅石墨力学性能的影响[J]. 中国腐蚀与防护学报, 2021, 41(1): 29-35.
Yan REN, Yuhai QIAN, Xintao ZHANG, Jingjun XU, Jun ZUO, Meishuan LI. Effect of Thermal Shock on Mechanical Properties of Siliconized Graphite with ZrB₂-SiC-La₂O₃/SiC Coating. Journal of Chinese Society for Corrosion and protection, 2021, 41(1): 29-35.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.046 或 https://www.jcscp.org/CN/Y2021/V41/I1/29

图1 渗硅石墨、ZrB2-SiC-La2O3/SiC涂层内层粉料和外层表面的XRD谱

图2 SG和CSG两种样品的表面和截面形貌照片

图3 SG和CSG两种样品热震过程中的质量变化曲线

图4 SG和CSG样品热震后的表面XRD谱

图5 SG和CSG样品热震后的表面形貌照片

图6 SG和CSG两种样品热震前后的弯曲强度和典型的应力-位移曲线

图7 SG样品热震前后的断口形貌及对应的元素分布

图8 CSG样品热震前后的断口形貌及对应的元素分布

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