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首页> 外文期刊>Materials Science and Engineering >Effect of ZrO_2 content on microstructure, mechanical properties and thermal shock resistance of (ZrB_2+3Y-ZrO_2)/BN composites
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Effect of ZrO_2 content on microstructure, mechanical properties and thermal shock resistance of (ZrB_2+3Y-ZrO_2)/BN composites

机译：ZrO_2含量对（ZrB_2 + 3Y-ZrO_2）/ BN复合材料的组织，力学性能和抗热震性的影响

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摘要

(ZrB_2 + 3Y-ZrO_2)/BN composites were fabricated by hot-pressing with different contents of 3Y-ZrO_2 ranging from 0 to 30 vol%. The mechanical properties and thermal shock resistance of composites were systematically investigated. The mechanical properties of the composites exhibit a gradual degradation while the thermal shock resistance is improved with the increasing ZrO_2 content. The flexural strength and fracture toughness of 30 vol% ZrO_2/BN composite are 183 MPa and 3.80 MPa m~(1/2), respectively. The residual strength ratio claims a slight decline to the lowest value of 86.8% after thermal shock, which is improved mainly due to the lower elastic modulus and higher ratio of fracture toughness to flexural strength with increasing ZrO_2 content. Furthermore, when temperature difference ranges from 1100 up to 1400 ℃, the residual flexural strength of the composites increases, which is attributed to the self-healing of cracks and the thermal-barrier effect of the oxide layer.
机译：（ZrB_2 + 3Y-ZrO_2）/ BN复合材料是通过热压法制备的，其3Y-ZrO_2的含量在0至30 vol％之间。系统地研究了复合材料的力学性能和抗热震性。随着ZrO_2含量的增加，复合材料的机械性能逐渐降低，而耐热冲击性得到改善。 30％（体积）ZrO_2 / BN复合材料的抗弯强度和断裂韧性分别为183 MPa和3.80 MPa m〜（1/2）。残余强度比声称略有下降，至热冲击后的最低值86.8％，这主要是由于随着ZrO_2含量的增加，较低的弹性模量和较高的断裂韧性与抗弯强度之比而得到改善。此外，当温度差在1100至1400℃范围内时，复合材料的残余抗弯强度会增加，这归因于裂纹的自我修复和氧化物层的热障效应。

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  • 来源
    《Materials Science and Engineering》 |2013年第20期|106-110|共5页
  • 作者

    Lei Chen; Yihe Huang; Yujin Wang; Haifeng Shen; Jiancun Rao; Yu Zhou;

  • 作者单位

    Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, PR China;

    Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, PR China;

    Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, PR China;

    Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, PR China;

    Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, PR China;

    Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    BN; ZrO_2; Mechanical properties; Thermal shock resistance; Residual strength;

    机译：BN;ZrO_2;机械性能抗热震性;残余强度;

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