摘要
以平均粒径为20μm的高纯熔融石英细粉为原料,分别以1%、2%和3%的纳米CeO2或纳米La2O3为添加剂,试样经50 MPa压力成形后,于还原气氛下经1300℃、1350℃和1400℃保温1 h烧成,制备出含稀土纳米氧化物的熔融石英陶瓷材料。通过热膨胀率测定与XRD分析,研究了稀土纳米氧化物对熔融石英高温晶化特性的影响。结果表明:在不同试验温度下,引入的纳米La2O3或纳米CeO2对熔融石英的晶化行为均有明显影响,纳米La2O3比纳米CeO2对熔融石英晶化的抑制作用更强。与空白试样比较,掺入纳米La2O3试样具有最低的热膨胀率,熔融石英的晶化温度提高100℃以上,晶化量减小约82%,纳米La2O3是熔融石英适宜的晶化抑制剂,其最佳引入量为1%。
Fused quartz ceramic was prepared with 50 MPa in reducing atmosphere at 1300 ℃, 1350 ℃ and 1400 ℃ for 1 h with fused quartz powder as raw materials （D50 = 20 ixm） , separately introducing nano-CeO2 or nano-La203 as additive with 1% ,2% and 3% dosages. Effect of rare earth nano-oxides on crystallization of fused quartz at high temperature were researched by measurements of thermal expansion rate and XRD. The results showed that crystallization behavior of fused quartz is obviously influenced by adding nano-CeO2 or nano-La2O3 at different test temperature, nano-La2O3 has more remarkable effect than nano-CeOz to restrain crystallization of fused quartz. Compared with the blank sample, the samples doped nano-La203 has least thermal expansion rate, c by 100 ℃ or more, crystallization amount of fused rystallization temperature of fused quartz increased silica reduced by about 82%, so nano-La203 is suitable as inhibitor for crystallization of fused quartz ceramic, its best dosage is 1%.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2013年第12期2611-2617,共7页
Bulletin of the Chinese Ceramic Society
基金
国家基金资助项目(51072046)
关键词
熔融石英
晶化
稀土纳米氧化物
热膨胀
相组成
fused quartz
crystallization
rare earth nano-oxide
thermal expansion
phase composition
