摘要
选用3种不同的优质粘土、滑石及工业氧化铝,通过一定的工艺控制,在1 390℃的烧成温度、保温4 h的条件下,研制出纯度较高。结晶性较好,热膨胀系数(20～1 000℃)分别为1.48×10-6,1.50×10-6/℃和1.54×10-6/℃,气孔率分别为15％,25％和33％的堇青石质蜂窝陶瓷载体。较低的热膨胀系数保证了载体有优异的抗热震性能,高的气孔率有利于后期催化剂的浸渍。实验表明:堇青石陶瓷成分的选择及杂质相的含量对于膨胀系数影响显著。
Cordierite honeycomb ceramics were prepared by using three different kinds of clay, talc and alumina as raw materials, and sintered at 1 390°C for 4 h. The cordierite honeycomb ceramics prepared are of high purity and better crystallization. The coefficient of thermal expansion of the materials obtained are 1.48×10-6, 1.50×10-6/°C and 1.54×106/°C at the temperature range of 20-1000°C, and the corresponding porosities are 15%, 25% and 33% respectively. The lower coefficient of thermal expansion leads to an excellent property of thermal shock resistance and the higher porosity is helpful for further treatment. Experiments show that the correct choice for chemical compositions of raw materials and the impurities have remarkable influence on the thermal expansion coefficient of cordierite honeycomb ceramics.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2004年第1期24-28,共5页
Journal of The Chinese Ceramic Society
关键词
堇青石
热膨胀系数
蜂窝陶瓷
Alumina
Ceramic materials
Clay
Crystallization
Honeycomb structures
Porosity
Talc
Thermal expansion
