摘要
采用干压成型法制备了多孔α-Al2O3基陶瓷片,研究了烧结温度和掺杂SiO2对其结构、形貌和性能的影响.提高烧结温度能增加α-Al2O3基陶瓷片的抗压强度,但收缩率也会随之增大。最佳烧结温度为1180℃,收缩率小于0.5%,抗压强度大于80 MPa。当掺杂SiO2粉体后,陶瓷片中的无定形SiO2在烧结过程中晶化形成方石英,能够促进α-Al2O3陶瓷片的烧结。当SiO2含量为12wt%,并在1180℃下烧结时,陶瓷片的收缩率仅为1.2%,抗压强度大于110 MPa。与α-Al2O3陶瓷片相比,其孔径更小但孔径分布更宽。研究表明,α-Al2O3和SiO2/Al2O3陶瓷片均具有良好的分子筛膜生长活性。但由于载体具有不同的物化性质,所制备的ZSM-5分子筛膜具有不同的形貌和尺寸。
Porous a-A1203 based ceramics disks were prepared by dry pressure molding method. Influences of sintering temperature and SiO2 dopant on the structure, morphology and properties were investigated. It was founded that compressive strength and shrinkage ratio of a-Al2O3 ceramic disk both increased with increasing sintering temperature. The shrinkage ratio and compressive strength was less than 0.5% and stronger than 80 MPa, respec- tively, while the optimum sintering temperature was chosen to be 1180℃. The sintering of a-Al2O3 ceramic disk would be enhanced by doping SiOz, which crystallized into cristobalite phase from an amorphous phase during the sintering process, a-Al2O3 ceramic disk doped with 12wt% SiO2 sintered at 1180℃ exhibited a stronger compres- sive strength （110 MPa） and a shrinkage ratio of 1.2%. The ceramic disk possessed a smaller pore size but a wider pore size distribution than that of the pure a-Al2O3 ceramic disk. It was demonstrated that both a-Al2O3 and SiO2 doped a-Al2O3 ceramic disk substrates were favorable for the growth of ZSM-5 zeolite membranes. However, these ZSM-5 zeolite membranes showed different morphologies and crystal sizes, due to the difference in physicochemical properties of substrates.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第6期599-604,共6页
Journal of Inorganic Materials
基金
国家自然科学基金(21136008)
山东省泰山学者建设项目(ts20081119)~~
关键词
多孔氧化铝陶瓷
收缩率
抗压强度
分子筛膜
porous Al2O3 ceramics
shrinkage ratio
compressive strength
zeolite membrane
