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Study on the preparation of MoSi2 modified HfB2-SiC ultra high tem-perature ceramic anti-oxidation coating by liquid phase sintering

REN Xuan-ru WANG Wei-guang SUN Ke HU Yu-wen XU Lei-hua FENG Pei-zhong

任宣儒, 王炜光, 孙科, 胡昱雯, 徐磊华, 冯培忠. 液相烧结法制备MoSi2改性HfB2-SiC超高温陶瓷抗氧化涂层研究[J]. 新型炭材料. doi: 10.1016/S1872-5805(21)60060-4
引用本文: 任宣儒, 王炜光, 孙科, 胡昱雯, 徐磊华, 冯培忠. 液相烧结法制备MoSi2改性HfB2-SiC超高温陶瓷抗氧化涂层研究[J]. 新型炭材料. doi: 10.1016/S1872-5805(21)60060-4
REN Xuan-ru, WANG Wei-guang, SUN Ke, HU Yu-wen, XU Lei-hua, FENG Pei-zhong. Study on the preparation of MoSi2 modified HfB2-SiC ultra high tem-perature ceramic anti-oxidation coating by liquid phase sintering[J]. NEW CARBON MATERIALS. doi: 10.1016/S1872-5805(21)60060-4
Citation: REN Xuan-ru, WANG Wei-guang, SUN Ke, HU Yu-wen, XU Lei-hua, FENG Pei-zhong. Study on the preparation of MoSi2 modified HfB2-SiC ultra high tem-perature ceramic anti-oxidation coating by liquid phase sintering[J]. NEW CARBON MATERIALS. doi: 10.1016/S1872-5805(21)60060-4

液相烧结法制备MoSi2改性HfB2-SiC超高温陶瓷抗氧化涂层研究

doi: 10.1016/S1872-5805(21)60060-4
详细信息
  • 中图分类号: TB321

Study on the preparation of MoSi2 modified HfB2-SiC ultra high tem-perature ceramic anti-oxidation coating by liquid phase sintering

Funds: The Fundamental Research Funds for the Central Universities (2018GF14)
More Information
  • 摘要: 本文将原位反应法和浆料法相结合,开发了一种液相烧结法,制备了涂层组分、含量和厚度可控的HfB2-MoSi2-SiC涂层,研究了MoSi2含量对HfB2-MoSi2-SiC复合涂层在室温~1500 ℃动态有氧环境以及1500 ℃静态恒温空气下的氧化防护行为的影响,提出了利用相对氧气渗透率表征涂层的抗氧化保护能力。室温~1500 ℃的动态氧化测试研究结果表明,随着MoSi2含量的增加,试样的起始氧化失重从775 ℃延迟到821 ℃,最大失重速率从0.9×10−3 mg·cm−2·s−1降低到0.2×10−3 mg·cm−2·s−1,最低相对氧气渗透率降低至12.2%,使得样品的失重率从1.8%降为0.21%。本文揭示了MoSi2增强涂层抗氧化保护能力的机理,随着MoSi2含量的提高,涂层中SiO2玻璃相的生成量增加,促进了涂层表面Hf氧化物的弥散,从而形具有更高稳定性的Hf-Si-O复相玻璃层,使得试样在1500 ℃静态恒温空气下氧化200 h的失重率从0.46%降低到0.08%,显著提升了涂层的抗氧化保护能力。
  • Figure  1.  Synthesis diagram of the HfB2-SiC-MoSi2/SiC coating prepared by liquid phase sintering method

    Figure  2.  TEM image of HfB2 powder

    Figure  3.  XRD pattern of HfB2-MoSi2-SiC coating

    Figure  4.  SEM morphology and EDS of HfB2-MoSi2-SiC composite coating

    Figure  5.  Section backscattering SEM morphology of (a) SiC inner coating and (b) HfB2-MoSi2-SiC/SiC composite coating

    Figure  6.  TG curve of HfB2-MoSi2-SiC composite coating at room temperature to 1500 ℃ in air

    Figure  7.  Weight loss rate curve of HfB2-MoSi2-SiC composite coating

    Figure  8.  Relative oxygen permeability curve of HfB2-MoSi2-SiC composite coating

    Figure  9.  Isothermal oxidation curve of HfB2-MoSi2-SiC coating at 1500 ℃

    Figure  10.  XRD pattern of HfB2-MoSi2-SiC composite coating after static constant temperature oxidation at 1500 ℃ for 200 h

    Figure  11.  SEM morphology and EDS of HfB2-MoSi2-SiC coating after dynamic oxidation at room temperature to 1500 ℃,(a)HfB2-60SiC;(b)HfB2-20MoSi2-40SiC;(c)HfB2-40MoSi2-20SiC;(d) EDS of region 1;(e) EDS of region 2;(f) EDS of region 3

    Figure  12.  SEM morphology of surface backscatter of HfB2-MoSi2-SiC coating after static constant temperature oxidation at 1500 ℃ for 200 h,(a)HfB2-60SiC;(b)HfB2-20MoSi2-40SiC;(c)HfB2-40MoSi2-20SiC

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  • 收稿日期:  2020-01-01
  • 修回日期:  2020-01-01
  • 网络出版日期:  2021-04-28

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