烧成温度对Al_2O_3-Fe_2O_3复合材料性能的影响

以煅烧α-Al2O3粉、氧化铁为原料,采用MgO为添加剂,控制配料的Al2O3/Fe2O3的摩尔比为1、3、5,MgO引入量质量百分数分别为2%、4%、6%,成型压强为100 MPa,烧结温度为1500℃、1550℃、1600℃,保温3小时可获得Al2O3-Fe2O3复合材料,对烧后试样了烧结与抗热震性能研究。结果表明：控制Al2O3-Fe2O3复合材料试样AF34-2的Al2O3/Fe2O3摩尔比为3,MgO引入量为4%,烧成温度为1550℃保温3小时的工艺条件,可以制备出较高致密度、常温抗折强度及抗热震性能的Al2O3-Fe2O3复合材料。该复合材料试样AF34-2的SEM显微结构照片显示出材料晶粒间结合紧密,形成具有直接结合的镶嵌结构。

Effect of Sintering Temperature on Al_2O_3-Fe_2O_3 Composites Performances

The calcination Al2O3 powder and ferric oxide was used as raw materials and MgO as additives.Controlling the mole ratio of Al2O3/ Fe2O3 is 1,3,5 and MgO content is 2 %,4 %,6 %.Moulding pressure was about 100 MPa,sintering at 1500 oC,1550 oC,1600 oC for 3h,Al2O3-Fe2O3 composites specimens were obtained.Sintering and thermal shock resistance performances of the Al2O3-Fe2O3 composites specimens were researched.The results showed that the Al2O3-Fe2O3 composite specimen AF34-2 sintered at 1550 ℃ for 3 h,the mole ratio of Al2O3/ Fe2O3 is 3 and MgO content is 4%,which has higher density,bending strength and thermal shock resistance performances.SEM picture of the specimen AF34-2 shows the material crystal grains contact tight and form mosaic structure of grains direct bonding.