Direct Foaming Method Prepared Lightweight Magnesia Raw Materials With Controlled Structure

摘要：

　　In order to prepare new heat-insulating refractories with low thermal conductivity and long life,the Micro-porosity of light raw materials is an effective way to achieve high thermal insulation and high strength coupling.The lightweight magnesia raw materials were prepared by foaming method.By studying the effects of stirring time(5,10,15,20 min),foam amount(300,500,700,900 mL),and particle size of the magnesia(0.3,3.48,20.16,40 μm)on the performance of the raw materials.The bulk density,apparent porosity and compressive strength of the samples after burning at 1580 ℃ were measured.The microstructure of the samples was analyzed by SEM.The results show that the stirring time has an important influence on the internal porosity and pore size of the materials.When the stirring time is 15min,the bulk density of the sample is the smallest,the apparent porosity is the highest,and the compressive strength is the highest.The pore size is in the range of 20-40μm.With the increase of foam amount in the slurry,the bulk density of the sample decreases,the apparent porosity increases,the compressive strength decreases,the pore diameter inside the sample becomes larger,the distribution becomes more dispersed.With the decrease of the particle size of magnesia,the bulk density of the sample decreases,the apparent porosity increases,the compressive strength increases,the pore diameter in the sample becomes smaller and more uniform,and the pore wall becomes thinner.

关键词： foaming lightweight magnesia raw materials potassium oleate

作者: LI Guohua GAO Huinan CHEN Shujiang TIAN Lin YUAN Lin

作者单位: School of High Temperature Materials and Magnesium Resource Engineering,University of Science and Te RUITAI Technology,China Building Materials Academy,Beijing 100024,China

会议类型: 国际会议

会议名称: Conference on Refractories International 2018, CRI2018)(2018国际耐火材料学术会议)

会议地点: 杭州

会议语种:英文

页码: 1-7

在线出版日期: 2018-10-17（万方平台首次上网日期，不代表论文的发表时间）