Controlling the structure and mechanical properties of porous B4C ceramics with unidirectionally aligned channels using sintering additives
Controlling the structure and mechanical properties of porous B4C ceramics with unidirectionally aligned channels using sintering additives
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使用烧结添加剂控制具有单向排列通道的多孔 B4C 陶瓷的结构和机械性能
DOI：
10.1016/j.ceramint.2020.03.218
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发表时间：
2020-07
影响因子：
5.2
通讯作者：
Feng Ye
中科院分区：
文献类型：
--
作者：
Yang Wang;Qiang Liu;Biao Zhang;Junjie Ding;Haoqian Zhang;Yicheng Jin;Zhaoxin Zhong;Wen Wang;Feng Ye
迄今为止，令人惊讶的是，很少有关于单向排列通道的多孔B4 C陶瓷的结构-性能相关性的研究报告。本研究以Al_2O_3-Y_2O_3为烧结助剂，采用冷冻铸造法制备了沿着凝固方向排列的双峰层状多孔B_4 C陶瓷。通过添加Al 2 O3-Y2 O3可以有效地调节孔隙率、孔径分布、形貌和抗压强度。体积收缩率为1.66 ~ 2.42%，远低于多孔陶瓷的报道值。低熔点的共晶液相对多孔B4 C陶瓷的烧结和强度有显著的影响。通过改变Al_2 O_3-Y_2 O_3烧结助剂的含量，制得的预制体具有较高的气孔率（78.71- 82.01%）和较低的闭孔率（0.37-0.86%），以及优异的抗压强度（1.76-3.28 MPa）。同时，随着Al 2 O3-Y2 O3含量的增加，薄膜的波长、片层厚度和孔径减小。添加Al 2 O3-Y2 O3可以对冷冻铸造法制备的多孔B4 C陶瓷进行结构调整，这对获得低收缩、低密度、高孔隙率、良好力学性能的预制体具有重要意义。
To date, surprisingly few studies about the structure-property correlations in porous B4C ceramics with unidirectionally aligned channels have been reported. In this study, bimodally lamellar porous B4C ceramics aligned along the freezing direction were produced via freeze casting method using Al2O3–Y2O3as the sintering additive. The porosity, pore size distribution, morphology, and compressive strength could be effectively tailored by the addition of Al2O3–Y2O3. The volume shrinkage ranged from 1.66 to 2.42%, much lower than the reported values of porous ceramics. A low-melting eutectic liquid was observed to exert significant effects on the sintering and strength of the porous B4C ceramics. By varying the contents of the Al2O3–Y2O3sintering additive, the preforms displayed a rather high porosity of 78.71–82.01%, a low closed porosity of 0.37–0.86% and an excellent compressive strength of 1.76–3.28 MPa. Meanwhile, the wavelength, lamellar thickness, and pore diameter decreased as the Al2O3–Y2O3content increased. Adding Al2O3–Y2O3can tailor the structures of porous B4C ceramics prepared by freeze casting, which is of great significance for the preforms with low shrinkage, low density, high porosity, and satisfactory mechanical performance.
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影响因子：
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