Effects of rare earth oxides on low temperature solid phase synthesis of MgAl2O4 fibers
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 pro-mote 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.
MgAl2O4 fibersrare earth oxidesadditiveslow temperature synthesis
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