以赤泥为助熔剂制备长石质发泡陶瓷  

Preparation of Feldspar Foam Ceramics with Red Mud as Flux

作　　者：张辉[1] 李安林 曾小州 黎阳[1] ZHANG Hui;LI An-lin;ZENG Xiao-zhou;LI Yang(School of Materials and Architectural Engineering,Guizhou Normal University,Guiyang 550025,China)

机构地区：[1]贵州师范大学材料与建筑工程学院

出　　处：《硅酸盐通报》2019年第12期4002-4006,共5页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51462004);贵州省教育厅自然科学基金([2015]363);贵州师范大学创新创业项目(2017045)

摘　　要：以赤泥作助熔剂、长石为主要原料、碳化硅微粉为发泡剂,通过模压成型、高温发泡等工序制备了长石质发泡陶瓷。研究了赤泥含量对发泡陶瓷线膨胀率、体积密度、微观形貌、抗折强度和晶体结构的影响。结果表明,以赤泥作助熔剂,可以有效降低发泡陶瓷的发泡温度,大幅提升碳化硅发泡剂的利用效率;随着赤泥含量的增加,发泡陶瓷内部形成的泡孔逐渐增多,孔径逐渐增大,线性膨胀率先增大后降低;在赤泥含量7. 5%时线膨胀率最大,此时发泡陶瓷的发泡率与孔径均匀性都较为理想,体积密度与抗折强度分别为0. 41 g/cm3和(0. 85±0. 04) MPa;发泡陶瓷的物相结构为石英(SiO2)、霞石(NaAlSiO4)、钙铝黄长石(Ca2Al2SiO7)和莫来石(3Al2O3·2SiO2)。Feldspar foam ceramics were prepared by process of mould pressing and high-temperature foaming with red mud as flux,fledspar as raw material and silicon carbide as foam agent. The effect of red mud content on linear expansivity,bulk density,microstructure and flexural strength of the foam ceramics were studied. Results show that the foaming temperature can be reduced effectively by adding red mud as flux. With increasing red mud content,the bubble hole number and pore size of the foam ceramics increase gradually,while the linear expansivity increases firstly and then decrease. The linear expansivity reaches the maximum at the red mud content of 7. 5%,as well as the foaming rate and the uniformity of the bubble hole are appropriate. The bulk density and flexural strength are 0. 41 g/cm^3 and( 0. 85 ± 0. 04) MPa,respectively.The main crystal structures of the foam ceramics are quartz,nepheline,calcium alumina feldspar and mullite.

关 键 词：赤泥 霞长石 助熔剂 发泡陶瓷 

分 类 号：TQ174[化学工程—陶瓷工业]