磷酸盐结合漂珠隔热材料的工艺参数研究

Investigation on process parameters of phosphate bonded cenosphere insulating material

采用漂珠作原料,外加一定量的磷酸盐为结合剂,氢氧化铝为促凝剂,泥料混匀后经手工压实成型,烧结成多孔状的磷酸盐结合漂珠隔热制品,并采用四因素三水平的正交试验方案优选出最佳的工艺参数(包括结合剂和促凝剂加入量、烧成温度和保温时间)。结果表明,磷酸盐结合漂珠隔热材料的最佳工艺方案为:漂珠100%,结合剂为漂珠质量的60%,促凝剂为结合剂质量的20%,烧成温度为1 200℃,保温时间为1 h。按此工艺制备的磷酸盐结合漂珠隔热材料试样的性能指标如下:常温耐压强度4.3 MPa,体积密度0.52 g·cm-3,高温耐压强度2.1 MPa(1 000℃),吸水率41.7%,抗热震性10次(950℃水冷),热导率为0.068 W·(m·K)-1(100℃)。

Porous cenosphere insulating products were prepared using cenosphere as starting material, phosphate as the binder and aluminum hydroxide as the set accelerator, mixing the materials uniformly, hand-molding and firing. The technological parameters （ binder addition, set accelerator addition,the firing temperature and the holding time） were optimized by orthogonal test with four factors and three levels. The results showed that the best formulation was：assuming cenospheres as 100 wt%, binder ：60 wt% of cenospheres, set accelerator.20 wt% of binder, firing at the 1200℃ for 1 h. The properties of the prepared material were： cold crushing strength ：4.3 MPa; bulk density ：0.52g·cm^-3; hot crushing strength .2.1 MPa（1000 ℃） ;water adsorption rate ：41.7% ;thermal shock resistance：10 cycles （950℃→←water quenching） ;thermal conductivity：0.068W·（m·K）^-1（100℃）.