Si_3N_4加入量对Al_2O_3-SiC-C铁沟浇注料性能的影响  

Effect of Si_3N_4 addition on property of Al_2O_3-SiC-C castables for iron trough and runner

作　　者：李朝云[1] 涂军波[1] 魏军从[1] 

机构地区：[1]河北理工大学材料学院河北省无机非金属材料重点实验室,河北唐山063009

出　　处：《耐火材料》2009年第4期260-262,共3页Refractories

基　　金：河北省自然科学基金资助项目(E2009000784);河北省教育厅资助项目(2008453);湖北省耐火材料与高温陶瓷重点实验室---省部共建国家重点实验室培育基地开放基金资助项目(G0604)

摘　　要：以电熔棕刚玉、碳化硅、α-Al2O3微粉、白刚玉、硅灰、硅粉为主要原料,以高铝水泥为结合剂,制备了铁沟浇注料,研究了Si3N4加入量(质量分数分别为0、3%、6%、9%、12%)对试样性能、物相组成和显微结构的影响。结果表明:(1)随着Si3N4加入量的增加,不同温度处理后Al2O3-SiC-C试样体积密度和常温强度基本上呈先增大后减小,显气孔率呈先减小后增大的变化趋势,Si3N4的适宜加入量为3%～6%。(2)中高温热处理时,试样中的Si3N4部分氧化生成了活性很高的SiO2,进而与Si3N4和α-Al2O3反应生成了O’-SiAlON结合相。(3)高温处理后试样的高温抗折强度随Si3N4加入量的增加而增大,而未经高温处理的试样的高温抗折强度则随着Si3N4加入量的增加而减小,这与试样中O’-SiAlON相的生成量有关。The castables for iron trough and runner were prepared using fused brown corundum, SiC, α-Al2O3 micropowder,white corundum,silica fume and silica powder as starting materials, high alumina cement as binder. Effects of Si3N4 additions （ mass percent ：0,3% ,6% ,9% and 12%, respectively） on property, phase composition and microstructure of castables were studied. The results showed that： （1）with Si3N4 addition increasing,the bulk density and cold strength of Al2O3 -SiC -C specimens treated at different temperatures changed from increasing to decreasing, and the apparent porosity of the specimens changed from decreasing to increasing,the appropriate addition of Si3N4 was 3%-6%;（2）During being treated at middle and high temperature, partial Si3N4 was oxidized and formed SiQ, which reacted with Si3N4 and α-Al2O3 forming O＇-SiAION phases; （3）The hot modulus of rupture of specimens treated at high temperature increased with Si3 N4 addition increasing, however, the hot modulus of rupture of specimens without hot treatment decreased with Si3N4 addition increasing,which was related with forming amount of O＇-SiAlON phases.

关 键 词：氮化硅 铁沟浇注料 高温抗折强度 显微结构 O’-SiAlON 

分 类 号：TQ174.758[化学工程—陶瓷工业] TQ175.732[化学工程—硅酸盐工业]