摘要
为了探索含钛化合物对浇注料性能的影响,以板状刚玉和烧结镁砂为主要原料,TiB_2作为添加剂,研究了在不同烧结温度下(1150-1450℃)TiB_2对浇注料性能的影响。利用X射线衍射仪、扫描电镜等测试手段分析样品的物相组成和显微结构。结果表明:TiB_2促进了浇注料中CA6的形成;TiB_2在高温时氧化形成TiO_2和B_2O_3促进了材料的致密化,从而使材料的显气孔率和线变化降低,并显著提高浇注料的强度。当TiB_2的加入量为0.87wt.%,在1450℃下保温300 min后浇注料的抗折强度可达50 MPa。
In order to address the effects of Ti-bearing compounds,the influence of TiB2addition on the properties of alumina-magnesiarefractory castables made from tabular alumina and calcined magnesia was investigated.The phase composition and microstructure ofcastables with TiB2addition after calcining at1150-1450℃were characterized by X-ray diffraction and scanning electron microscope.Theresults show that TiB2as a mineralizer could accelerate the CA6formation.The densification of castables was improved as a consequenceof the oxidation of TiB2,which converted into TiO2and B2O3at high temperatures.Meanwhile the apparent porosity and linear changeof castables with TiB2addition decreased,and their strengths increased.The strength of the alumina-magnesia refractory castabless wasobviously improved by adding TiB2.CMOR of composites with0.87wt.%TiB2sintered at1450℃for5h achieved50MPa.
作者
唐海
员文杰
朱青友
邓承继
祝洪喜
TANG Hai;YUAN Wenjie;ZHU Qingyou;DENG Chengji;ZHU Hongxi(The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China)
出处
《陶瓷学报》
北大核心
2017年第4期564-568,共5页
Journal of Ceramics
基金
国家自然科学基金(项目号51502214)
