Abstract: To investigate the effects of rare earth oxides and heat treatment temperatures on their synthesis,MgAl₂O₄ fibers were prepared using basic magnesium sulfate whiskers and alumina sol as raw materials,and Y₂O₃,La₂O₃ and Nd₂O₃ as additives,heat treating at different temperatures.The effects of additive types (Y₂O₃,La₂O₃ and Nd₂O₃),additive additions (0,1%,2% and 3%,by mass) and heat treatment temperatures (800,1 000 and 1 200 ℃ for 3 h) on the low temperature solid phase synthesis of MgAl₂O₄ fibers were studied.The results show that:(1)with basic magnesium sulfate whiskers and alumina sol as raw materials and heat treatment temperature of 800 ℃,adding 3% Nd₂O₃ or Y₂O₃ can significantly promote the synthesis of MgAl₂O₄ fibers;(2)when the heat treatment temperature is 1 000 ℃,adding 3% Nd₂O₃ has the best effect on the synthesis of MgAl₂O₄ fibers.

Key words: MgAl₂O₄ fibers, rare earth oxides, additives, low temperature synthesis

摘要： 为探究稀土氧化物和合成温度对合成镁铝尖晶石纤维的影响,以碱式硫酸镁晶须、铝溶胶为主要原料,分别以Y₂O₃、La₂O₃、Nd₂O₃为添加剂,经不同温度热处理后,制备了镁铝尖晶石纤维,研究了添加剂的种类(Y₂O₃、La₂O₃、Nd₂O₃)、加入量(加入质量分数分别为0、1%、2%和3%)以及不同热处理温度(800、1 000和 1 200 ℃保温3 h)对低温固相合成镁铝尖晶石纤维的影响。结果表明:1)以碱式硫酸镁晶须、铝溶胶为原料,添加质量分数为3%(w)的Nd₂O₃或Y₂O₃在800 ℃热处理时均对镁铝尖晶石纤维的合成具有较为明显的促进作用。2)热处理温度为1 000 ℃时,添加3%(w)Nd₂O₃合成镁铝尖晶石纤维的效果最好。

关键词: 镁铝尖晶石纤维, 稀土氧化物, 添加剂, 低温合成