摘要
以Al_(2)O_(3)和SiO_(2)为原料,掺入不同含量的ZnO,采用高能球磨法与固相烧结法制得了莫来石多孔陶瓷,研究了ZnO含量及烧结温度对莫来石多孔陶瓷相组成、微观形貌、热膨胀性能、体积密度和气孔率的影响。研究结果表明,ZnO对莫来石的相形成和各向异性晶粒生长有着积极作用,ZnO含量为37.5mol%时,试样中莫来石的成相温度为1300℃,比未掺杂ZnO试样的莫来石形成温度降低了约100℃,且各向异性晶粒的尺寸也有所增大。随着ZnO含量从0mol%增加到37.5mol%,所制备的多孔陶瓷样品的线收缩率、体积密度均逐渐降低,而其孔隙率逐渐增大。当ZnO含量为37.5 mol%、烧结温度为1500℃时,试样的线收缩率达最小值1.59%,体积密度达到最小值1.96g/cm^(3),而孔隙率达到最大值45.54%。这种无需造孔剂的方法为莫来石多孔陶瓷的制备提供了一条新的途径。
Porous mullite ceramics were fabricated by using high-energy ball milling and solid state sintering with Al_(2)O_(3) and SiO_(2) as the main raw materials and ZnO(0-37.5 mol%)as an additive.The effects of ZnO and sintering temperature on phase formation,microstructure evolution,thermal expansion,bulk density and porosity of the porous mullite samples were examined.The results show that ZnO has a positive effect on the phase formation and anisotropic grain growth of mullite.The formation temperature of mullite phase is 1300℃ in samples doped with 37.5 mol%ZnO,which is nearly 100℃ lower than samples without ZnO doped,and the size of anisotropic grain increases.The porosity of the as-prepared porous ceramics increases,while the linear shrinkage and bulk density decrease with ZnO increasing from 0 mol%to 37.5 mol%.When the content of ZnO is 37.5 mol%,the linear shrinkage and bulk density of the porous ceramics samples are 1.59%and 1.96 g/cm^(3),with the maximum porosity of 45.54%,after sintering at 1500℃.This method provides a new approach for the preparation of porous mullite ceramics without pore-forming agent.
作者
张玲
黄靖茵
何宇
刘凯歌
肖卓豪
周超兰
曾绍忠
项炳锡
翟剑庞
孔令兵
ZHANG Ling;HUANG Jingyin;HE Yu;LIU Kaige;XIAO Zhuohao;ZHOU Chaolan;ZENG Shaozhong;XIANG Bingxi;ZHAI Jianpang;KONG Lingbing(College of New Materials and New Energies,Shenzhen Technology University,Shenzhen 518118,Guangdong,China;School of Materials Science and Engineering,Jingdezhen Ceramic Institute,Jingdezhen 333403,Jiangxi,China;Jiangxi Guanyi Grinding Co.,Ltd.,Fengxin 330700,Jiangxi,China)
出处
《陶瓷学报》
CAS
北大核心
2021年第2期288-294,共7页
Journal of Ceramics
基金
深圳技术大学新引进高端人才财政补助科研启动项目(2019010801002)
深圳技术大学启动研究经费(2018)
国家自然科学基金(51962013,51762023)
江西省重点研发项目(20192ACB80007,20201BBE51011,20192ACB80004)
江西省自然科学基金(20192ACB20018)。
关键词
莫来石
ZNO
多孔陶瓷
高能球磨
晶粒生长
致密化
微观结构
mullite
ZnO
porous ceramics
high-energy ball milling
grain growth
densification
micro structure
