晶化温度对R_2O-MgO-Al_2O_3-SiO_2系微晶玻璃析晶和力学性能的影响  

Effect of Crystallization Temperature on the Crystallization and Mechanical Properties of R_2O-Mg O-Al_2O_3-SiO_2 System Glass-ceramics

作　　者：杨芃[1] 黄永前[1] 孙慧[1] 欧甜[1] 余正茂[1] 

机构地区：[1]四川大学材料科学与工程学院,成都610064

出　　处：《硅酸盐通报》2015年第4期985-988,共4页Bulletin of the Chinese Ceramic Society

摘　　要：采用整体析晶法，以花岗岩废渣为主要原料，TiO2和P2O5作复合晶核剂，制备了R2O-MgO-A12O3-SiO2系微晶玻璃。用DSC、XRD、SEM等表征方法研究了晶化温度对微晶玻璃的晶相组成、显微结构和力学性能的影响。实验结果表明：晶化温度为900℃时，析出镁铝钛酸盐和顽辉石晶相。晶化温度在1080-1200℃之间时，微晶玻璃中析出棒状假蓝宝石、镁铝钛酸盐、顽辉石的复合晶相，随晶化温度的升高，晶相含量增加，晶粒尺寸增大。晶化温度为1240℃时，假蓝宝石相减少，尖晶石相析出。在1200℃晶化2h后的微晶玻璃四点抗弯强度最高，达到109．25MPa。R2O-MgO-A12O3-SiO2 system glass-ceramics were prepared via a bulk-crystallization method by using granite waste as main materials and TiO2 and P2O5 as complex nucleation agents. The effects of crystallization temperature on the crystalline phase, microstructure and mechanical properties of R2O- MgO-A12O3-SiO2 system glass-ceramics were investigated by differential scanning calorimetry（DSC） ,X- ray diffraction （XRD）, scanning electron microscope （SEM）. The results indicated that magnesium aluminum titanate and enstatite formed after heated at 900 ℃ for 2 h. When the crystallization temperature was within the range of 1080 ℃ to 1200 ℃, precipitated, the crystal content and the grain magnesium aluminum titanate , enstatite and sapphirine size increased with crystallization temperature. When the crystallization temperature was 1240 ℃, the content of sapphirine phase decreased, and spinel phase appeared. The maximum value of the flexural strength for the glass-ceramics which heated at 1200 ℃ for 2 h was 109.25 MPa.

关 键 词：微晶玻璃 晶化温度 显微结构 四点抗弯强度 

分 类 号：TQ171[化学工程—玻璃工业]