【作者】 舒豪； 何峰； 梅书霞； 金明芳； 谢峻林；

【Author】 Shu Hao;HE Feng;Mei Shu-xia;Jin Ming-fang;Xie Jun-lin;School of Materials Science and Engineering,Wuhan University of Technology;State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology;

【机构】 武汉理工大学材料科学与工程学院； 武汉理工大学硅酸盐建筑材料国家重点实验室；

【摘要】 尾矿对环境已经造成了严重的污染和破坏。实验采用低温直接发泡法制备钼尾矿多孔陶瓷,利用钼尾矿、滑石、硼砂、氧化铝作为主要原料,以碳化硅作为发泡剂,其中钼尾矿的掺入量达到80%,制备钼尾矿保温多孔陶瓷。通过XRD、SEM、力学测试仪等方法测试分析了多孔陶瓷样品的结构和性能,研究了配比组成、烧成温度、相组成、气孔结构对多孔陶瓷样品强度及导热系数的影响。结果表明:利用钼尾矿制备多孔陶瓷,在钼尾矿的掺入量为80%的前提下,滑石的掺入量9%时,烧结发泡温度可以控制在1100℃以下,且可以接受较宽的波动范围,最佳的烧结温度为1080℃,样品气孔分布均匀,平均抗折强度可以达到7.8 MPa,体积密度约为0.25 g/cm~3。滑石中的氧化镁在样品中起减低高温粘度,促进气孔均匀的作用,添加适量的滑石可以提高气孔分布的均匀性,同时使气孔直径分布范围变窄,添加量过多时导致样品脆性增加,体积密度增加、强度降低。更多还原

【Abstract】 The tailings have caused serious damage and pollution to the environment.In the study directly foaming method was adopted to get the foam-ceramic in relatively lower sintering temperature,the main materials were molybdenum tailing、talcum、borax and alumina,in which the ratio of molybdenum tailing is up to 80 percent,and SiC was used as the foaming agent.X-ray diffraction,SEM and mechanic tests were used to analyze the structure and performance of the foam-ceramic,the influence of the formulation composition,sintering temperature,the phase composition and pore structure on the strength and thermal conductivity were studied.The results showed that the sintering temperature of the prepared foam-ceramic with 80 percent of molybdenum tailing and 9 percent of talcum was under 1100 ℃ and the accepted rang of the sintering temperature was quite large,in fact the optimum sintering temperature was 1080 ℃.Meanwhile,the porous structure of the samples was uniform,and the average value of flexural strength was 7.8 MPa,the dulk density was about 0.25 g/cm3.MgO contained in talcum may decrease the high temperature viscosity,which can contribute to uniformizing the structure of pores,meanwhile adding a small amount of talcum can improve the uniformization of the pore,and it can narrow the distribution of the pores diameter.The amount of excess will increase the brittleness and dulk density,thereby reduce the mechanic strength.更多还原