基于机械活化法制备高强韧高柔性建筑陶瓷  

Preparation of Building Ceramics with High Strength-Toughness and High Flexibility by a Mechanical Activation Method

作　　者：聂光临 刘一军 汪庆刚 黄玲艳 吴洋 潘利敏 包亦望 饶平根[2] NIE Guanglin;LIU Yijun;WANG Qinggang;HUANG Lingyan;WU Yang;PAN Limin;BAO Yiwang;RAO Pinggen(Postdoctoral Research Center,Monalisa Group Co.,Ltd.,Foshan 528211,Guangdong,China;School of Materials Science and Engineering,South China University of Technology,Guangzhou 510641,China;State Key Laboratory of Green Building Materials,China Building Materials Academy,Beijing 100024,China)

机构地区：[1]蒙娜丽莎集团股份有限公司博士后科研工作站,广东佛山528211 [2]华南理工大学材料科学与工程学院,广州510641 [3]中国建筑材料科学研究总院有限公司绿色建筑材料国家重点实验室,北京100024

出　　处：《材料导报》2023年第24期127-135,共9页Materials Reports

基　　金：蒙娜丽莎集团股份有限公司博士后科研工作站资助项目;广东省基础与应用基础研究基金(2023A1515012676)。

摘　　要：为实现建筑陶瓷力学性能的大幅度提升,采用机械活化法(MA)对建筑陶瓷粉体进行预处理,探究了MA处理时间对建筑陶瓷粉体、生坯、烧结体性能的影响规律;并基于陶瓷试样物相组成与微观结构分析,阐释了MA的强韧化机制。结果表明:MA可降低陶瓷粉体粒径、增强烧结活性,并提升陶瓷生坯的致密化进程,而且有利于提升建筑陶瓷的致密度,降低陶瓷中气孔缺陷数量与尺寸,继而实现了陶瓷的致密化强化;此外,MA还可以细化与均匀化刚玉和石英相颗粒,促进石英在液相中的熔解,提升玻璃相基体中SiO_(2)含量,增大莫来石相的结晶度与长径比及陶瓷断面的粗糙度与裂纹扩展路径,继而可提升弥散增强、基体强化、莫来石强化效果与裂纹偏转增韧效果,有利于实现建筑陶瓷的强韧化。随着MA处理时间的延长,建筑陶瓷的力学强度、韧性与柔性均逐渐增强,MA处理40 min制得的陶瓷试样的弯曲强度((88.2±6.3)MPa)、断裂功((390.5±44.2)J/m^(2))与极限应变((10.24±0.48)×10^(-4))分别较未经MA处理制得的试样提升了52.8%、112.6%、39.1%,表明MA是一种有效的建筑陶瓷强韧化和柔化方法。此外,该方法操作简单,在高强韧建筑陶瓷板材制备领域具有广阔的应用前景。In order to greatly enhance the mechanical properties of the building ceramic,a mechanical activation method(MA)was used to pretreat the building ceramic powder,and the effects of MA time on the properties of building ceramic powder,green and sintered bodies were investigated.The strengthening-toughening mechanisms of building ceramics after the MA treatment were also demonstrated based on the phase composition and microstructure analyses.The results indicate that MA can be adopted to reduce the particle size of ceramic powder,enhance the sinte-rability and promote the densification process of ceramic green body,which are conductive to improving the relative density of building ceramic and reducing the number and size of pore flaws in ceramic,resulting in the high densification strengthening for the ceramics.Besides,the MA is favorable for refining and homogenizing the corundum and quartz particles,promoting the dissolution of quartz into the liquid phase and boosting SiO_(2) content in the glass phase matrix,improving the crystallinity and aspect ratio of the mullite phase,and enlarging the facture surface roughness and the crack propagation path in ceramic,thus resulting in the enhanced dispersion strengthening,matrix reinforcing,mullite strengthening and the crack deflection toughening effects.Afterwards,the building ceramic can be effectively strengthened and toughened.The mechanical strength,toughness and flexibility of building ceramic samples were enhanced gradually with the increase of MA time.The flexural strength((88.2±6.3)MPa),fracture energy((390.5±44.2)J/m^(2))and failure strain((10.24±0.48)×10^(-4))of the ceramic sample prepared with MA treatment for 40 min were 52.8%,112.6%and 39.1%higher than those of the sample prepared without MA treatment,respectively,indicating that MA is an effective way to strengthen-toughen the building ceramics and to enhance their flexibility.Moreover,this method is simple in operation and has substantial prospects in the preparation of building ceramic slabs with hig

关 键 词：机械活化法 建筑陶瓷 弯曲强度 断裂功 强韧化 物相组成 微观结构 

分 类 号：TU523[建筑科学—建筑技术科学]