摘要
为改善含球形45莫来石轻骨料浇注料的体积稳定性和显微结构,引入了不同含量的蓝晶石(w=8%、10%、12%、14%、16%)。采用X-射线衍射仪、扫描电子显微镜等对1300℃保温3 h煅烧后试样的物相组成、显微结构与性能进行了表征。研究发现:随着蓝晶石含量的增加,1300℃煅烧后试样的强度显著降低,线变化率由-0.87%逐渐增加至0.64%,骨料基质结合程度先变好后变差。综合考虑各项性能,含12%蓝晶石的试样综合性能最优:1.73g/cm3的体积密度,36.8%的显气孔率,29.3 MPa的耐压强度,0.18%的线变化率,0.58 W/(m·K)的导热系数(800℃)和1339℃(T_(0.6))的荷重软化温度。
In order to improve the volume stability and microstructure of the lightweight mullite castables which used the spherical shape lightweight mullite（M45） as aggregates,five castables with different contents of kyanite（w = 8% 、10% 、12% 、14% and 16%） were prepared.The phase compositions,microstructures and physical properties of the specimens sintering at 1300 ℃ for 3 h were investigated through x-ray diffractometer（XRD）,scanning election microscopy（SEM）,etc.The results show that,for the specimens sintered at 1300 ℃,with the kyanite content increased from 8wt% to 16wt%,the strengths decreased significantly when the linear change rates increased from-0.87% to 0.64%,and the bonding between matrix and aggregate got better first and then got poor.The most apposite mode is the sample containing 12% kyanite,which had a bulk density of 1.73 g/cm^3,an apparent porosity of 36.8%,a high crushing strength of 29.3 MPa,a low linear change rate of 0.18%,a thermal conductivity of 0.58 W/（m·K） at 800 ℃ and a refractoriness under load（T_（0.6）） of 1339 ℃.
作者
王月月
鄢文
李楠
张振燕
高光斌
WANG Yue-yue;YAN Wen;LI Nany;ZHANG Zhen-yan;GAO Guang-bin(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2018年第1期200-205,共6页
Bulletin of the Chinese Ceramic Society
基金
湖北省自然科学基金重点项目(2015CFA122)
武汉市青年科技晨光计划项目(2016070204010108)
关键词
球形莫来石轻骨料
轻质莫来石浇注料
蓝晶石含量
显微结构
性能
spherical lightweight mullite aggregate
lightweight mullite castable
kyanite content
microstructure
property
