文档介绍：第29卷第4期
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纳米莫来石的制备及其对氧化铝陶瓷性能的影响
马红萍1,祝邦文1,王建武2,吴赛豪2
(,杭州310012;,温州325400)
摘要:以硝酸铝和硅溶胶为原料,采用溶胶一凝胶法合成了纳米莫来石粉体,进而探讨了纳米莫来石对氧化铝陶瓷
烧结性能、抗弯强度以及抗热震性能的影响。结果发现,在1100℃煅烧硝酸铝与硅溶胶先驱体时仅有少量A1:0,
生成,当将煅烧温度升高到1200 oC时,获得了单一的莫来石晶相,粉体的平均粒径在50~60 nm之间;在氧化铝中
添加2wt%~10wt%的纳米莫来石,可以有效促进陶瓷体的致密烧结,并获得良好的抗弯强度与抗热震性能;纳米
莫来石含量为5wt%的陶瓷,在1650 MPa,经过1200℃
MPa;当纳米莫来石的添加量超过10wt%时,将降低陶瓷的饱和体积密度,并恶化陶瓷的抗弯强度与抗热震性能。
关键词:纳米莫来石;溶胶一凝胶;氧化铝陶瓷;抗弯强度;抗热震性能
中图分类号:0648
文献标识码:A
文章编号:1001-1625(2010)04-0842-05
Preparation of
Mullite
Nanopowder and Its Impact
on
A12 03 Ceramic Performance
MA Hong-pin91,ZHU ,WANG Jian一"14)li,2,WU
( of Mechanical and
Ensineering,Zhejiang University
Science and Technology,Hangzhou 310012,China;
Qiushi Medical
LTD,Wenzhou
325400,China)
Abstract:Using A1(N03)3・9H20 and colloidal silica
raw
materials,mullite nanopowders was
prepared,and the sintering property,bending strength and thermal shock
resistance
of A12 03 ceramics
doped with Mullite nanopowders were Was found that the single phase Mullite could be
formed at the calcining temperature of 1200℃.and the average diameter of powders Was 50-60
bulk density,bending strength and thermal shock resistance of A12 03 ceramics were improved with the
addition of 2wt%一10wt%Mullite with 5
wt%Mullite nanopowders,the bending
strength of A1203 ceramics sintered at 1650℃and
MPa respectively.
thermal
shocked at 1200℃were and
Key words:mullite nanopowder;sol・gel;A12 03
ceramic;bending strength;thermal
shock resistance
1
引
言
氧化铝陶瓷是氧化物中最稳定的物质,具有机械强度大、硬度高、耐磨损、耐高温、耐腐蚀、高的电绝缘性
与低的介电损耗等特点,加上其价格低廉,已经成为目前应用最广的结构陶瓷与功能陶瓷材料,在航空、航
天、发动机耐磨部件、电子瓷、陶瓷阀芯、刀具等方面均得到了广泛应用‘¨1。然而,氧化铝陶瓷同大多数陶瓷
一样,存在着抗热震性差和断裂韧性低的缺点。为提高氧化铝陶瓷的