摘要
以废玻璃、粉煤灰为主要原料,利用快速烧结-晶化法制备斜辉石-钙长石微晶玻璃。利用XRD和SEM研究了升温速率对微晶玻璃烧结-晶化行为和显微结构影响。结果表明,与10℃/min常规烧结相比,30℃/min以及烧结温度下直接置入烧结的烧结激活能显著降低,微晶玻璃体积密度更大、气孔孔径更小。快速升温时最佳烧结温度明显降低,且钙长石晶相出现择优取向生长,导致微晶玻璃抗弯强度增大,950℃下直接置入烧结的微晶玻璃抗弯强度达到最高值107 MPa。
Augite-anorthite glass-ceramics were prepared by rapid sinter-crystallization techniques using waste glass and fly ash as principal raw materials. The effects of heating rate on the sinter-crystallization behavior and microstructure of glass-ceramics were investigated by X- ray diffraction and scanning electron microscopy. Results indicate that the sintering activation energy of two rapid sintering processes, one is with a heating rate of 30℃/min and the another is charging the samples at the sintering temperatures, is dramatically reduced as compared to that of the conventional sintering with a heating rate of 10 ~C/rain. Rapid sintering processes result in higher bulk density and smaller porous size for the sintered glass-ceramics. Moreover, the optimal sintering temperature of the powder compacts is evidently decreased, and the anorthite crystallites are formed with preferred orientation, leading to an improved bending strength of the glass- ceramics by rapid sintering. The maximum bending strength of 107 MPa is obtained for sintered at 950 ℃ by charging samples at sintering temperature.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第1期26-30,共5页
Transactions of Materials and Heat Treatment
基金
江西省教育厅科研项目(GJJ11497)
江西省研究生创新基金(YC10A111)
关键词
废玻璃
粉煤灰
微晶玻璃
烧结-晶化行为
抗弯强度
waste glass
fly ash
glass-ceramics
sinter-crystallization behavior
bending strength
