摘要
冷冻干燥法制备晶须结构的莫来石多孔陶瓷是一种新工艺。该工艺以Al(OH)_(3)、SiO_(2)为原料,AlF_3、V_2O_5为添加剂在1300℃条件下先制备出莫来石晶须粉料;然后将莫来石晶须粉料混合La_2O_(3)和聚乙烯醇配制成水基陶瓷浆料,再用冷冻干燥的方法得到莫来石多孔陶瓷。用该方法制备的莫来石多孔陶瓷由晶须构成,孔隙率高达88%,并且可以通过改变浆料的固含量来调节孔隙率。由于具有交联互锁的网络结构,该莫来石多孔陶瓷还表现出较高的抗压强度。
Freeze casting is a novel processing method to fabricate porous mullite ceramics built by mullite whiskers.Mullite whiskers werefirst prepared by heating raw materials of Al(OH)3,SiO2 and additives of AlF3 and V2O5 at 1300°C.Then mullite whiskers were mixed withLa2O3 and polyvinyl alcohol to prepare aqueous ceramic slurry.Finally porous mullite ceramics were fabricated by freeze casting method.Theporous mullite ceramics show whisker-interlocked pore structure.The porosity of the ceramics is up to 88%,and can be tuned by changingthe solid loadings of ceramic slurry.The porous ceramics also show good compressive strength due to the whisker-interlocked structure.
作者
董雷
陈拥军
骆丽杰
李豪
李天峰
DONG Lei;CHEN Yongjun;LUO Lijie;LI Hao;LI Tianfeng(Key Lab of Advanced Materials of Tropical Island Resources of Ministry of Education,College of Materials and Chemical Engineering,Hainan University,Haikou 570228,Hainan,China)
出处
《陶瓷学报》
CAS
北大核心
2016年第3期259-264,共6页
Journal of Ceramics
基金
国家高技术研究和发展计划(863计划)项目(2015AA034103)
海南省自然科学基金项目(20155201)
关键词
莫来石
冷冻干燥
高孔隙率
晶须
mullite
freeze casting
high porosity
whisker
