摘要
本文研究了不同类型的炭黑及ZrB2对低碳MgO-C耐火材料抗氧化性以及显微结构的影响。通过抗氧化实验和热重-差热实验(TG-DSC),分析了炭黑和ZrB2在空气气氛下的反应行为,通过粒度分析研究了炭黑的粒度及结构对镁碳材料抗氧化性的影响,利用X衍射分析(XRD)研究了埋碳烧成后试样的物相组成,结合扫描电子显微镜(SEM)和能谱分析(EDS)观察了试样的显微结构,并探讨了ZrB2在MgO-C耐火材料中的抗氧化机理。结果表明:半补强炉黑和通用炉黑由于具有较大的粒径和较低的炭黑结构,所以抗氧化性较好;自蔓延合成ZrB2与空气反应的最大放热峰温度低于碳热还原ZrB2,在温度较低时更容易与空气中的氧发生反应,且反应温度范围较宽,故其具有较好的抗氧化效果。
In the present study, different types of carbon black were used in low-carbon MgO-C refractories, and ZrB2 by different synthesis methods was used as antioxidant. The reaction behavior of ZrB2 and carbon black in air atmosphere was investigated by thermo-gravimetric analysis （TG-DSC） respectively. The effect of different particle size and different structure of carbon black on oxidation resistance was researched by particle size analysis. The phase composition of samples was studied by XRD. The microstructure of the samples was observed by SEM with EDS. And the reaction mechanism of ZrB2 was also studied. It shows that semi-reinforcing carbon black and general furnace black have great resistance to oxidation because of their lower structure and larger particle size. Self-propagating synthesized ZrB2 has higher reaction activity with O2 compared with carbon thermal reduction synthesized ZrB2, so it has better oxidation resistance in low-carbon MgO-C materials.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2013年第4期738-742,共5页
Bulletin of the Chinese Ceramic Society
基金
陕西省国际合作项目(2010KW-24(2))
教育部留学回国人员科技启动基金(教外司留[2011]1139)
人力资源和社会保障部留学人员科技活动择优资助项目
关键词
低碳MGO-C砖
炭黑
ZRB2
抗氧化性
low-carbon MgO-C refractories
carbon black
ZrB2
oxidation resistance
