B_4C外加量对Al_2O_3-SiC-Si_3N_4铁沟浇注料性能的影响  

Effects of B_4C additions on properties of Al_2O_3-SiC-Si_3N_4 castables for iron trough

作　　者：涂军波[1] 魏军从[1] 李朝云[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》2010年第1期7-10,共4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)

摘　　要：研究了B4C外加量（外加质量分数为0~0.6%）对Al2O3-SiC-Si3N4铁沟浇注料常温物理性能和高温抗折强度的影响。用X射线衍射仪、扫描电镜和能谱仪测定了试样的物相组成和显微结构。结果表明：随着B4C加入量的增大,浇注料体积密度和常温强度先增大后减小,显气孔率先减小后增大,高温抗折强度先增大后减小;B4C外加质量分数为0.4%时,浇注料综合性能达到最佳。B4C在材料中的作用主要是促进烧结和防氧化。与未添加B4C试样相比,添加B4C的试样中生成了更多纤维状的O’-SiAlON,且长径比更大。O’-SiAlON的生长机制推断为气-固机制。Effects of B4C additions（0,0.2%,0.4%,and 0.6%） on cold physical properties and hot modulus of rupture of Al2O3-SiC-Si3N4 castables for iron trough investigated.The phase composition and microstructure were analyzed by XRD and SEM.The results show that bulk density,cold strength,and hot modulus of rupture of castables first increase and then decrease while apparent porosity first decreases and then increases with B4C addition increasing.The optimum addition of B4C is 0.4%.B4C mainly contributes to sintering and antioxidation.Compared with the specimens without B4C,the specimens with B4C have more fibrous O＇-SiAlON with larger length-diameter ratio.The grow mechanism of O＇-SiAlON crystals is deduced to gas-solid mechanism.

关 键 词：Al2O3-SiC-Si3N4 铁沟浇注料 碳化硼 O’-SiAlON 防氧化 

分 类 号：TQ175.732[化学工程—硅酸盐工业]