摘要
以电熔白刚玉和α-Al2O3微粉为原料,固定骨料质量分数为65%,基质质量分数为35%,调整基质组成,研究了在刚玉制品中分别加入质量分数为2%、5%、8%和14%的Si粉对1500℃埋炭烧后试样的常温物理性能、高温性能、物相组成和显微结构的影响,分析了1000～1500℃烧后刚玉制品的物相变化。结果表明:加入Si粉的试样烧后微膨胀,常温和高温强度明显提高,尤其是1400℃的高温抗折强度最高可提高近1.5倍;抗热震性显著提高,1100℃水冷1次后强度保持率从22.58%最高提高到80.65%。性能提高的主要原因是Si粉在埋炭条件下与碳反应生成SiC,填充在刚玉骨架结构中,起强化作用。Si粉的较佳质量分数为5%～8%。试样在加热过程相变化的研究结果表明:SiC的生成在1200℃已较明显,在1400℃反应基本完成。
The specimens are prepared by using fused corumdum and a-AI203 micropowder as starting materials and the aggregates and the matrix addition are fixed at 65% and 35% ,through changing the composition of the matrix. The effects of 2% ,5% ,8% and 14% mass ratio silicon powder addition on physical properties, hot strength,changes in phase composition and microstructure of corundum brick after firing at 1 500℃ under carbon embedded condition were investigated ;and the changes in phase composition after firing at 1000 - 1 500℃ was also studied. The results show that.with Si addition,there is a little expansion of specimens,noticeable increase in strength at room temperature and high temperature;the HMOR at 1 400℃ has increased about 1. 5 times ;thermal shock resistance is noticeably improved and the residual strength ratio is increased from 22.58% to 80.65% at △T=1 100℃ after one thermal shock cycle（water cooling）. The main reason is under testing conditions Si reacts with C to form SiC which will fill in the interstices Of corundum skeleton Structure,thus creating strengthening effect. Optimum addition of Si is 5% -8%. Phase composition changing during heating shows that SiC formation is noticeable at 1 200℃ and practically completed at 1 400℃.
出处
《耐火材料》
EI
CAS
北大核心
2007年第1期13-17,共5页
Refractories
关键词
刚玉制品
SI粉
埋炭烧成
力学性能
抗热震性
Corundum, Si powder,Carbon embeded firing, Mechanical property,Thermal shock resistance
