添加碳化硼对低碳铝碳耐火材料显微结构和性能的影响

发布时间：2018-04-29 23:22

  本文选题：碳化硼 + 铝碳耐火材料　； 参考：《硅酸盐学报》2017年09期

【摘要】：以板状刚玉和活性氧化铝微粉为主要原料、纳米炭黑为碳源、碳化硼(质量分数0、0.5%、1%)和单质硅粉为添加剂,制备了低碳铝碳耐火材料。利用X射线衍射仪、场发射扫描电子显微镜分别检测和观察了材料的物相组成和显微结构。采用三点弯曲法研究了材料的常温和高温力学性能,采用水淬冷法研究了材料的热震稳定性。结果表明:与空白试样相比,在1 000℃处理的含碳化硼的试样中发现碳纳米管(MWCNTs);温度高于1 200℃,在材料表面出现了明显的含氧化硼反应层,形成了外层Si C晶须较多、内层Si C晶须较少的分层结构。由于原位碳纳米管的形成,1 000℃处理后含碳化硼试样的抗折强度由空白试样的3.4 MPa提高到11.6 MPa;而1 200和1 400℃处理后,试样也因碳纳米管和Si C晶须协同作用,材料的抗折强度进一步提高至15~17和26~28 MPa。此外,引入碳化硼的铝碳材料高温抗折强度和热震稳定性也都大幅提升。
[Abstract]:Low carbon aluminum carbon refractories were prepared by using plate corundum and activated alumina powder as main raw materials, carbon black as carbon source, boron carbide (mass fraction 0 ~ 0. 5) and silicon powder as additives. The phase composition and microstructure of the materials were examined and observed by X-ray diffraction and field emission scanning electron microscopy. The mechanical properties at room temperature and high temperature were studied by three point bending method, and the thermal shock stability was studied by water quenching method. The results show that compared with the blank sample, CNTs MWCNTsN are found in the boron carbide treated at 1 000 鈩，

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