摘要
以粒度为2～1mm和1～0.5mm的M60莫来石为骨料,以电熔白刚玉粉以及粒度分别为0.8～0.355mm、0.355～0.088mm和<0.088mm的蓝晶石为基质料,以少量二氧化硅微粉和苏州土为结合剂,制成36mm×36mm的试样,在110℃干燥24h后,分别在1200℃、1300℃、1400℃和1500℃保温3h煅烧,然后测定烧后试样的线变化率、显气孔率、体积密度和耐压强度。结果表明:(1)对于在各温度下煅烧后的试样,添加粒度<0.088mm蓝晶石的试样烧后线变化率和显气孔率较添加粒度>0.088mm蓝晶石的小,体积密度和耐压强度较添加粒度>0.088mm蓝晶石的大;(2)当添加粒度<0.088mm的蓝晶石时,随着煅烧温度的升高,试样的烧后线变化率、显气孔率、体积密度和耐压强度变化较小;当添加粒度>0.088mm的蓝晶石时,随着煅烧温度的升高,试样的烧后线变化率和显气孔率迅速增大,体积密度和耐压强度迅速减小。
The corundum-mullite specimens with the size of φ36 mm × 36 mm were prepared using mullite with the particle sizes of 2-1 mm and 1-0.5 mm respectively as aggregate, fused white corundum and kyanite with the particle sizes of 0.8-0.355 mm, 0.355-0.088 mm and less than or equal 0.088 mm respectively as matrix materials and a little amount of microsilica and Suzhou clay as binders. Then the specimens were dried at 110°C for 24 h and calcinated at 1200°C for 3 h, 1300°C for 3 h, 1400°C for 3 h and 1500°C for 3 h respectively. The linear change rate, apparent porosity, bulk density and cold crushing strength of the calcinated specimens were determined. The results showed that: 1) The specimens containing kyanite which particle size was below 0.088 mm had lower linear change rate and apparent porosity, higher bulk density and cold crushing strength than those of the specimens containing kyanite which particle size was >0.088 mm. 2) For the specimens containing kyanite which particle size was below 0.088 mm, their linear change rate, apparent porosity, bulk density and cold crushing strength only had a little change with the raising of the calcination temperature; However, for the specimens containing kyanite which particle size was >0.088 mm, their linear change rate and apparent porosity increased quickly, bulk density and cold crushing strength decreased quickly with the raising of the calcination temperature.
出处
《耐火材料》
EI
CAS
北大核心
2005年第3期182-184,187,共4页
Refractories
