摘要
用工业废弃物粉煤灰为主要原料,采用模压成型和挤压成型工艺,在较低温度下烧制成了多孔陶瓷过滤膜。研究了造孔剂、烧成温度等对多孔陶瓷样品的孔隙率、孔结构以及物相和强度等的影响。研究表明,反应烧结是主要的烧结过程机制,烧成样品以莫来石相和方石英相为主要物相。在优化的条件下,即造孔剂添加量为20%、烧成温度1250℃时,样品的孔隙率为51.2%,中位孔径为3.72μm,N2气体通量高达1.4×104m3.m-2.h-1.bar-1,其弯折强度达64MPa,可以满足作为高温气-固分离过滤介质的要求。
Porous ceramics have been made by waste coal fly ash as main source at lower sintering temperature. The phases, microstructure and properties related to gas-solid separations are characterized as a function of the amount of the pore-forming agent and heating temperature. The results indicate that the reaction sintering is the main sintering mechanisms. Under optimized conditions, i.e. 20% starch content as pore-forming agent and sintering temperature of 1250℃, the porosity and mean pore size of the specimens were 51.2% and 3.72μm respectively. The N2 permeability is 1.4 × 10^4 m^3 · m^-2 · h^-1 · bar^-1 and the bending strength is 64MPa, these well meet the requirements for the applications in gas-solid separation and purification.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2006年第4期484-488,共5页
Journal of Materials Science and Engineering
基金
国家重点基础研究发展规划(973)资助项目(2003CB615700)
关键词
粉煤灰
多孔陶瓷膜
烧结机理
气-固分离
性能表征
fly ash
porous ceramic membrane
sintering mechanism
gas- solid separation
characterization
