Y_(2)O_(3)对原位合成堇青石-莫来石复相太阳能储热陶瓷的烧结性能影响  

Effects of Y_(2)O_(3) on Sintering Prosperities of in Situ Synthesized Cordierite-mullite Composite Ceramic Material for Solar Thermal Storage

作　　者：吴建锋 周炀[1,2] 张银凤 徐晓虹[1,2] 刘少恒 陈甜甜 WU Jian-feng;ZHOU Yang;ZHANG Yin-feng;XU Xiao-hong;LIU Shao-heng;CHEN Tian-tian(Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory,Foshan 528200,China;State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;School of Materials Science and Engineering,Hubei Polytechnic University,Huangshi 435003,China)

机构地区：[1]先进能源科学与技术广东省实验室佛山分中心(佛山仙湖实验室),佛山528200 [2]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070 [3]湖北理工学院材料科学与工程学院,黄石435003

出　　处：《武汉理工大学学报》2022年第9期7-12,共6页Journal of Wuhan University of Technology

基　　金：先进能源科学与技术广东省实验室佛山分中心(佛山仙湖实验室)开放基金(XHD2020-001).

摘　　要：以天然矿物为原料,Y_(2)O_(3)为烧结助剂,采用无压烧结法原位合成了堇青石-莫来石复相太阳能储热陶瓷。采用XRD,FE-SEM等测试方法系统地研究了样品的结构与性能,探讨了Y_(2)O_(3)对样品烧结性能的影响机理。研究发现,添加少量的Y_(2)O_(3)可有效地改善复相陶瓷的烧结性能,提高致密度和力学性能。当Y_(2)O_(3)添加量为质量分数1.5%时,复相陶瓷样品的吸水率仅为0.02%,体积密度为2.46g/cm^(3),抗折强度达107.07MPa。Y_(2)O_(3)的助烧机理是Y^(3+)进入堇青石晶格中,置换结构中的Mg^(2+),并在堇青石结构中产生间隙O2-缺陷或Mg^(2+)空位缺陷,形成晶格畸变,提高了晶格扩散速率,有利于烧结致密化。Cordierite-mullite composite solar thermal storage ceramics were synthesized via pressureless sintering method by using natural minerals as the raw materials and Y_(2)O_(3)as the sintering additive.The phase composition,microstructure and properties of the samples were systematically investigated.Specially,the effect of the Y_(2)O_(3)content on the sintering property was researched and the relevant mechanism was revealed.It was found that,the sintering property of the composite ceramics could be obviously improved by adding a small amount of Y_(2)O_(3),which further increased the densification and the mechanical properties.Specifically,with 1.5%Y_(2)O_(3)addition,the water absorption,bulk density and bending strength of the composite ceramics reached 0.02%,2.46g/cm^(3)and 107.07MPa,respectively.The sintering mechanism can be described as follows:Mg^(2+)in the structure of cordierite can be replaced by Y^(3+),which results in the lattice defects of interstitial O2-and Mg^(2+)vacancy.As a result,the formation of the above lattice distortion increases the lattice diffusion rate,which improves the sintering densification of the composite ceramics.

关 键 词：堇青石-莫来石复相陶瓷 太阳储热陶瓷 Y_(2)O_(3) 液相烧结 力学性能 致密度 

分 类 号：TQ174.1[化学工程—陶瓷工业]