摘要
采用挤压成型法和固态粒子烧结法制备α-Al2O3陶瓷支撑体,主要研究复相烧结助剂MgO-MnO2-TiO2中MnO2添加量(质量分数)对陶瓷支撑体性能的影响。通过压汞法、内外加压法、三点弯曲法、质量损失法、扫描电镜和X射线衍射等方法对α-Al2O3陶瓷支撑体的孔隙率、纯水通量、抗折强度、酸碱腐蚀、微观结构及晶体类型和晶相成分进行分析表征。研究结果表明:MnO2能够和Al2O3形成固溶体Mn2AlO4,使晶格畸化,增加晶体的结构缺陷,从而降低烧结温度,促进α-Al2O3陶瓷支撑体的烧结。当MnO2添加量少于0. 5%时,烧结不完全;MnO2添加量大于2%时,晶粒出现异常生长;MnO2的添加量为1. 5%时,制备的α-Al2O3陶瓷支撑体样品性能最佳,孔隙率为38. 25%,抗折强度为80. 3 MPa,纯水通量达6579. 52 L/(m2·h·MPa),酸/碱腐蚀重量损失率为1. 22%/0. 90%。
The α-Al2O3 ceramic support was prepared by extrusion-forming and solid sintering methods. The effect of MnO2 addition on the performance of ceramic support was mainly studied. Mercury intrusion method,self-made pure water flux measurement device,three-point bending method,mass loss method,SEM and XRD were used to analyze the porosity,pure water flux,flexural strength,acid and alkali corrosion,surface morphology and crystal phases of the α-Al2O3 ceramic support. The results show that: MnO2 can form a solid solution Mn2AlO4 with alumina,which deforms the lattice and increases structural defects,thereby lowering the sintering temperature and promoting the sintering of the α-Al2O3 ceramic support. When the additive amount of MnO2 is less than 0. 5%,the sintering is incomplete,and when the additive amount of MnO2 is more than 2%,the crystal grains grow differently. The optimum dosage of MnO2 is 1. 5%,where the prepared support has a good performance with a porosity of 38. 25%,the flexural strength is 80. 3 MPa,the pure water flux is 6579. 52 L/( m2·h·MPa),the weight loss rate of acid/alkali corrosion is only 1. 22%/0. 90%.
作者
刘婷
同帜
王丹
王佳悦
LIU Ting;TONG Zhi;WANG Dan;WANG Jiayue(School of Environmental and Chemical Engineering,Xi'an Polytechnic University,Xi'an 710048,China)
出处
《中国材料进展》
CAS
CSCD
北大核心
2020年第2期146-150,共5页
Materials China
基金
陕西省科技厅重点研发计划专项资金资助项目(2017GY-128)
