晶化温度对花岗岩废渣微晶玻璃结构及抗弯强度的影响  

Influence of Crystallization Temperature on Microstructure and Bending Strength of Glass-ceramics Prepared from Granite Tailings

作　　者：余正茂[1] 黄永前[1] 欧甜[1] 王金龙[1] 

机构地区：[1]四川大学材料科学与工程学院,成都610065

出　　处：《硅酸盐通报》2016年第6期1923-1928,共6页Bulletin of the Chinese Ceramic Society

摘　　要：以花岗岩废渣为原料,用熔融法制备了R2O-Mg O-Al_2O_3-SiO_2系微晶玻璃。用DSC、XRD、FESEM、EDS等分析手段探究了晶化温度（975~1160℃）对微晶玻璃显微结构和四点抗弯强度的影响。结果表明：随晶化温度的提高,样品的主晶相逐渐由镁硅酸盐、镁黄长石向镁铝硅酸盐、顽辉石转变,最终形成块状顽辉石、柱状镁橄榄石和多面体状尖晶石。晶化温度为1040℃时,由镁铝硅酸盐、顽辉石堆叠形成的针状聚集体和致密块状聚集体相间排布的特殊结构有利于增强微晶玻璃的抗弯性能,其四点抗弯强度达到145.99 MPa;随着晶化温度的进一步提高,四点抗弯强度下降。The influence of crystallization temperature（975-1160 ℃） on microstructure and four-point bending strength of R2O-Mg O-Al_2O_3-SiO_2 system glass-ceramics prepared from granite tailings with melting technique was investigated by methods of differential scanning calorimetry（DSC）,X-ray diffraction（XRD）,field emission scanning electron microscopy（FESEM）,energy dispersive spectrometry（EDS）,etc.The results show that the main phases of the glass-ceramics transform from magnesium silicate and akermanite to magnesium aluminum silicate and enstatite gradually,and finally to the bulk crystals of enstatite,columnar crystals of forsterite and polyhedron-like crystals of spinel as crystallization temperature increases.Crystallized at 1040 ℃,the interlocking microstructure of glassceramics formed from bulk and columnar aggregations,mainly are magnesium aluminum silicate and enstatite.This structure can enhance the four-point bending strength of glass-ceramics,and the maximum value of four-point bending strength is 145.99 MPa.Then the four-point bending strength of glassceramics decreases gradually with the crystallization temperature enhancement.

关 键 词：晶化温度 花岗岩废渣 微晶玻璃 四点抗弯强度 

分 类 号：TQ171[化学工程—玻璃工业] X705[化学工程—硅酸盐工业]