合成致密刚玉-莫来石-锌铝尖晶石复相材料的工艺研究

The Study of Sintering Technics on the Synthesis of Dense Corundum-Mullite-ZnO·Al_2O_3 Multiphase Materials

研究了合成致密刚玉-莫来石-锌铝尖晶石复相材料的工艺条件.通过XRD和SEM分析了煅烧温度与生成物相的关系,采用二步煅烧工艺研究了轻烧温度及轻烧时间对刚玉-莫来石-锌铝尖晶石复相材料的烧结性能的影响.结果发现:采用ZnO、SiO2、Al(OH)3为原料,1300℃时,系统中能够生成刚玉、莫来石、锌铝尖晶石.在轻烧温度为1300℃时,最佳的保温时间为3h,此时显气孔率达到最小,体积密度相应最大.进一步提高轻烧温度到1400℃时,有利于刚玉-莫来石-锌铝尖晶石复相材料的烧结,在此轻烧温度下,最佳的保温度为2h,此时试样的显气孔率达到最大,体积密度相应最小.

The technics of synthesizing dense Corundum-Mullite-ZnO · Al2O3 Multiphase Materials was studied. The relationship between the mineral phase and sintering temperature was investigated by x-ray diffraction （XRD） and scan electron microscope （SEM）. The effect of light sintering temperature and time on the sintering properties of Corundum-Mullite-ZnO · Al2O3 Multiphase Materials was researched by traditionally double sintering method. The result show that corundum, mullite and ZnO · Al2O3 can be formed at 1 300℃ or above using the raw materials of ZnO, SiO2 and AI（OH）3. The optimum light sintering time is 3h at light sintering temperature of 1 300℃ and Corundum-Mullite-ZnO · Al2O3 multiphase materials have the minimum apparent porosity and the maximum bulk density. It is favorable to reduce apparent porosity and bulk density while the light sintering temperature can be increased to 1 400℃. At 1 400℃, the optimum holding time is 2h and the multiphase materials of the minimum apparent porosity and maximum bulk density can be obtained.