摘要
基于Al2O3-SiO2-MgO三元体系,在75%(Al2O3-SiO2-MgO)混合粉末中添加25%SiO2/Al2O3空心球;采用凝胶注模成型方法,制备一种1400℃低温烧成、体积密度1.43g/cm3、热导率0.20W/m·K、开口气孔率18%、闭口气孔率31%和抗弯强度30MPa的莫来石基气密型轻质、隔热材料。研究结果表明:烧结过程堇青石的出现、莫来石化和烧结材料较高的闭口气孔率分别是低温烧成、高强度和气密型低导热的主要原因。
Based on the ternary system of Al2O3-SiO2-MgO, mullite-based composites with 75%(Al2O3-SiO2-MgO) complex and 25% SiO2/Al2O3-based empty balls derived from coal flyash were prepared using gel-casting processing and followed by a low-temperature sintering at 1400 ℃, which was 1.43 g/cm3 of bulk density, 0.20 W/m·K of thermal conductivity,18% of apparent porosity, 31% of closed porosity and 30 MPa of bending strength. It is shown that occurrence of cordierite, mullitization, and higher closed porosity is the main reason for low-temperature sintering, higher bending strength and hermetic low thermal conductivity, respectively.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2011年第S1期29-31,共3页
Rare Metal Materials and Engineering
基金
863计划项目资助(2006AA03Z540)
关键词
莫来石
气密型
低温烧结
闭气孔
mullite
hermetic type
low-temperature sintering
closed porosity
