MnO_2对硅酸三钙晶粒尺寸及晶型的影响  

Influence of MnO_2 on Crystal Grain Size and Polymorphisms of Tricalcium Silicate(C_3S)

作　　者：李相国[1] 柯凯[2] 马保国[1] 吕阳[1] 王晓亮[1] 

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,湖北武汉430070 [2]湖北工业大学化学与环境工程学院,湖北武汉430068

出　　处：《建筑材料学报》2012年第4期544-547,共4页Journal of Building Materials

基　　金：国家重点基础研究发展计划(973计划)项目(2009CB623201);国家自然科学基金资助项目(51002110)

摘　　要：以Ca(OH)2,SiO2化学纯为原料,分别掺入不同质量分数的MnO2,制备了不同晶型的硅酸三钙(C3S),运用相图,XRD(X射线衍射),IR(红外光谱)及MDI jade5.0软件研究MnO2对C3S晶粒尺寸和晶型转变过程的影响.结果表明:MnO2的掺杂降低了C2S及液相的形成温度,进而促使C3S生成.经MnO2掺杂后,C3S晶型转变和晶粒成长均受到影响.随着MnO2掺量的增大,CaO-SiO2二元体系中C3S成核速率大于长大速率,导致C3S晶粒尺寸依次减小.同时,由晶面指数和IR分析发现,C3S晶型逐步由TⅢ型向R型转换,当w(MnO2)<3.0%时,易稳定M型C3S存在,当w(MnO2)≥3.0%时,可稳定R型C3S存在.Tricalcium silicate（C3S） with different polymorphism were prepared by a calcination method with Ca（OH）2 and SiO2 as raw materials and MnO2 as doping agent. The influences of MnO2 on grains growth and polymorphism transformation of C3S were investigated by phase diagram analysis, XRD, IR and MDI jade5.0 software. The results indicate that from the TGA and phase diagram analyses, the doping of MnO2 will reduce the formation temperature of C2S and liquid phase, resulting in promoting the formation of C3S. The crystal grain size and polymorphisms of C3S are influenced by the addition of MnO2. Crystal grain size of the C3 S samples decreases by increasing the doping of MnO2, due to nucleation rate rather than growth rate of C3S in the CaO-SiO2 binary system. The results from crystal plane index and IR demonstrate that polymorphism was transformed from TIII to R-mode due to the addition of MnO2. M-mode C3 S exists in stable state at w（MnO2）〈3.0%, R-mode C3 S exists in stable state at w（MnO2 ）≥3. 0%.

关 键 词：二氧化锰(MnO2) 硅酸三钙(C3S) 相图 晶型 晶粒尺寸 

分 类 号：TQ172.11[化学工程—水泥工业]