Effect of volume ratio on optical and mechanical properties of Y2O3-MgO composites fabricated by spark-plasma-sintering process
Effect of volume ratio on optical and mechanical properties of Y2O3-MgO composites fabricated by spark-plasma-sintering process
复制标题
体积比对放电等离子烧结Y2O3-MgO复合材料光学和力学性能的影响
DOI：
10.1016/j.jeurceramsoc.2020.10.074
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发表时间：
2021
影响因子：
5.7
通讯作者：
Byung-Nam KIM
中科院分区：
文献类型：
--
作者：
Lihong LIU;Koji MORITA;Tohru S. SUZUKI;Byung-Nam KIM
研究了Y2O3:MgO比例对Y2O3-MgO复合材料微观结构、光学和力学性能的影响。尽管使用放电等离子烧结（SPS）技术成功地制备了不同 Y2O3:MgO 比例的致密 Y2O3-MgO 复合材料，但 Y2O3:MgO 比例显着影响复合材料的微观结构和光学/机械性能。由于均匀的两相微观结构产生的有效钉扎力，Y2O3:MgO = 50:50 的复合材料获得了细小的晶粒尺寸。 SPSed 致密复合材料在从可见光到红外 (IR) 的宽波长范围内表现出良好的透射率。单片Y2O3多晶，即Y2O3:MgO = 100:0，在600 nm处表现出最高的透过率，为62.3%，在5 μm处为84.3%。尽管红外透射率与 Y2O3:MgO 比例无关，但可见光透射率随 MgO 颗粒分散而降低。在Y2O3-MgO复合材料中，Y2O3:MgO=50:50的复合材料由于其晶粒尺寸最小，比其他两种Y2O3:MgO=30:70和70:30的复合材料获得了更高的可见光透过率。与透射率相反，无论晶粒尺寸如何，随着 MgO 含量的增加，硬度 Hv 和韧性 KIC 趋于增加； Hv 和 KIC 分别从整体 Y2O3 的 9.6 GPa 和 1.1 MPa m1/2 增加到 Y2O3/MgO = 30:70 复合材料的 12.7 GPa 和 2.5 MPa m1/2。复合材料硬度和韧性的提高主要可以通过混合规则解释为 MgO 相体积分数的函数。
The effect of Y2O3:MgO ratio on the microstructures, optical and mechanical properties of the Y2O3-MgO composites were investigated. Although the dense Y2O3-MgO composites were successfully fabricated in various Y2O3:MgO ratios using the spark-plasma-sintering (SPS) technique, the Y2O3:MgO ratio significantly influenced the microstructures and the optical/mechanical properties of the composites. Fine grain size was obtained in the composite with Y2O3:MgO = 50:50 owing to the effective pinning force caused by the homogenous two phase microstructure. The SPSed dense composites showed good transmittance in the wide wavelength range from visible to infrared (IR). The monolithic Y2O3polycrystal, that is Y2O3:MgO = 100:0, showed the highest transmittance of 62.3 % at 600 nm and 84.3 % at 5 μm. Although the IR transmittance is independent of the Y2O3:MgO ratio, the visible transmittance decreased with the MgO particle dispersion. Among the Y2O3-MgO composites, the higher visible transmittance was obtained in the composite with Y2O3:MgO = 50:50 than those of the other two composites with Y2O3:MgO = 30:70 and 70:30 due to its smallest grain size. In contrast to the transmittance, the hardnessHvand toughnessKICtend to increase with increasing the MgO fraction irrespective of the grain size; bothHvandKICincreased from 9.6 GPa and 1.1 MPa m1/2for the monolithic Y2O3to 12.7 GPa and 2.5 MPa m1/2for the composite with Y2O3/MgO = 30:70, respectively. The enhanced hardness and toughness of the composite can be interpreted dominantly by the mixture rule as a function of the volume fraction of the MgO phase.
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DOI：
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发表时间：
2011
期刊：
--
影响因子：
--
作者：
Qing Li;Guoping Zhang;Hao Wang;Li;P. China
通讯作者：
P. China
DOI：
10.1016/j.jeurceramsoc.2011.11.023
发表时间：
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影响因子：
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