Microstructure and mechanical properties of MgOC refractories containing graphite oxide nanosheets (GONs)
Microstructure and mechanical properties of MgOC refractories containing graphite oxide nanosheets (GONs)
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DOI：
10.1016/j.ceramint.2012.09.080
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发表时间：
2013-04
影响因子：
5.2
通讯作者：
Tianbin Zhu;Ya-wei Li;Ming Luo;S. Sang;Qinghu Wang;Lei Zhao;Yuanbing Li;Shujing Li
中科院分区：
文献类型：
--
作者：
Tianbin Zhu;Ya-wei Li;Ming Luo;S. Sang;Qinghu Wang;Lei Zhao;Yuanbing Li;Shujing Li
本工作制备了含纳米氧化石墨片（GONs）和Al、Si添加剂的MgO/C耐火材料。首先将膨胀石墨和氧化镁粉采用普通球磨法制备了MgO/MgO_（60）复合粉体，并将其掺入到MgO/C耐火材料中。采用X射线衍射（XRD）、扫描电镜（SEM）结合能谱（EDS）、三点弯曲法和热震试验等方法，研究了不同温度处理后MgO/C耐火材料的物相组成、显微结构、力学性能和热机械性能。结果表明，不同粒径和厚度的GON在氧化镁粉体中分布均匀。GON的加入对MgO/C耐火材料的力学性能有积极的影响。在1400°C下烧制后，与仅含有MgO石墨的试样相比，添加GON的MgO SiC试样实现了高得多的冷断裂模量（CMOR）和增加的位移。此外，所有含GON的试样的抗热震性均优于不含GON的试样。结果表明，在MgO/C耐火材料中，GON相和原位生成的陶瓷相起到了强化增韧的作用。
MgOC refractories containing graphite oxide nanosheets (GONs) and Al, Si additives were prepared in this work. Firstly the MgOGONs composite powders were fabricated by common ball milling of expanded graphite and magnesia powders, and then incorporated into MgOC refractories. The phase composition, microstructure, mechanical and thermo-mechanical properties of MgOC refractories treated at the different temperatures were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS), three-point bending method and thermal shock test. The results showed that the GONs of different sizes and thicknesses were well distributed in magnesia powders. Addition of GONs had a positive influence on the mechanical properties of MgOC refractories. After firing at 1400°C, much higher cold modulus of rupture (CMOR) and increased displacement were achieved for MgOC specimens with GONs added compared to that of the specimen contained only flaky graphite. Moreover, the thermal shock resistance of all the specimens containing GONs was better than that for the specimen containing no GONs. It was suggested that GONs and in-situ formed ceramic phases in the matrix strengthened and toughened MgOC refractories.