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添加碳化硼对低碳铝碳耐火材料显微结构和性能的影响
作者:刘耕夫 李亚伟   桑绍柏 
单位:武汉科技大学 省部共建耐火材料与冶金国家重点实验室 武汉 430081 
关键词:碳化硼 铝碳耐火材料 显微结构 力学性能 热震稳定性 
分类号:TQ175
出版年,卷(期):页码:2017,45(9):0-0
DOI:
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SiC晶须较多、内层SiC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SiC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。

 
基金项目:
国家自然科学基金(51372176;51574186)资助。
作者简介:
刘耕夫(1993—),男,博士研究生。
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