摘要
以粘土、滑石、氧化铝微粉等为原料 ,于1370~ 14 0 0℃烧成 ,合成了堇青石陶瓷。研究了添加 5 %~ 2 0 %的钛酸铝 (AT )或 5 %~ 15 %的氧化铝(A)与氧化钛 (T)的混合物 (A与T的摩尔比 1∶1)对堇青石陶瓷的相组成及热膨胀率的影响。结果表明 :添加AT或A +T均能有效地降低材料的热膨胀率 ;XRD分析表明 ,在添加 15 %以上AT或添加10 %以上A +T的堇青石试样中形成了莫来石与钛酸铝晶体 ;SEM显微照片表明 ,引入AT或A +T均促进了堇青石的合成。从效果和节约能源考虑 ,应添加 10 %~ 15 %的A +T ,烧成温度为 14 0 0℃左右。
Cordierite ceramics were synthesized by firing green bodies at 1370~1400 ℃ using raw materials of clay,talc and alumina powders.Effects of 5%~20% aluminum titanate(AT) or 5%~15% mixture of alumina(A) and titania(T) (molar ratio 1∶1) on phase compositions and thermal expansion rates of the ceramics were researched.The dilatometric experiments showed that both AT and A+T can effectively decrease thermal expansion rate.XRD analysis results showed that mullite and aluminum titanate crystals were formed in samples containing more than 15% AT or those containing more than 10% A+T.SEM analysis indicated that either AT or A+T promotes the synthesis of cordierite and crystal growth.Adding 10%~15% A+T and sintering at temperature about 1400 ℃ should be the optimum condition for synthesizing cordierite ceramics.
出处
《耐火材料》
CAS
北大核心
2002年第3期139-141,共3页
Refractories
关键词
热膨胀性能
堇青石陶瓷
添加剂
钛酸铝
氧化钛混合物
氧化铝
Cordierite ceramics,Thermal expansion rate,Additive,Aluminum titanate,Mixture of alumina and titania