花岗岩粉体两步法烧结多孔微晶玻璃及其发泡机理研究  

Two-step Sintering and Foaming Mechanism of Porous Glass-ceramics from Granite Powder

作　　者：周剑[1] 刘长有 卢金山[1] ZHOU Jian;LIU Changyou;LU Jinshan(School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,Jiangxi,China)

机构地区：[1]南昌航空大学材料科学与工程学院,江西南昌330063

出　　处：《陶瓷学报》2024年第2期308-316,共9页Journal of Ceramics

基　　金：国家自然科学基金(52060020)。

摘　　要：以花岗岩粉体为原料、以SiC为发泡剂,采用低温烧结—高温发泡的两步法烧结工艺,制备出多孔微晶玻璃。利用XRD、SEM、TG-DSC和陶瓷弯曲试验机等测试技术,系统研究烧结温度和发泡温度对多孔微晶玻璃的气孔结构、晶相组成、抗压强度的影响,并分析微晶玻璃发泡机理。随着烧结温度的升高,未添加发泡剂的微晶玻璃抗弯强度与体积密度均先增大后减小,最佳烧结温度为1120℃。随着发泡温度的升高,多孔微晶玻璃中钙长石和石英逐渐溶于玻璃相,结晶度降低,气孔孔径增大,表观密度和抗压强度均减小,但比强度在1220℃时达到最大值5.36 kN·m·kg^(-1)、气孔率为59.7%。与一步烧结的通孔结构不同,两步烧结形成闭孔结构,多孔微晶玻璃的比强度明显高于一步烧结法。Porous glass-ceramics were prepared by using a two-step sintering process,i.e.,low-temperature sintering and high-temperature foaming,with granite powder as the raw material and SiC as the foaming agent.The effects of sintering and foaming temperature on pore structure,crystal phase composition and compressive strength of the porous glass-ceramics were systematically studied by using XRD,SEM,TG-DSC and ceramic bending tester.Foaming mechanism of the glass-ceramics was analyzed.With increasing sintering temperature,flexural strength and bulk density of the glass-ceramics without foaming agent first increased and then decreased,while the optimum sintering temperature was 1120℃.With increasing foaming temperature,anorthite and quartz in the glass-ceramics gradually dissolved into the glass phase.Meanwhile,the crystallinity decreased,the pore size increased,and both the apparent density and compressive strength decreased.However,the specific strength reached a maximum value of 5.36 kN⋅m·kg^(-1)at 1220℃,with a porosity of 59.7%.In contrast to the open pore structure of the one-step sintered sample,the two-step sintered sample shows a closed pore structure.Specific strength of the porous glass-ceramic prepared by using the two-step sintering is superior to that of sample prepared by using the one-step sintering method.

关 键 词：花岗岩粉体 烧结 多孔微晶玻璃 抗压强度 比强度 发泡机理 

分 类 号：TQ174.75[化学工程—陶瓷工业]