没食子酸正丙酯修饰颗粒法制备Al_2O_3多孔陶瓷  

Preparation of porous Al_2O_3 ceramics with propyl gallate modified particles

作　　者：屈源超[1] 杨道媛[1] 冯晓聪[1] 马旻晓 

机构地区：[1]郑州大学材料科学与工程学院,河南郑州450001

出　　处：《耐火材料》2014年第4期275-277,281,共4页Refractories

基　　金：国家自然科学基金项目(50972131;51372229);国家"十二五"科技支撑计划项目(2013BAE03B00);郑州市科技局创新团队项目(111100531749)

摘　　要：为了提高泡沫陶瓷浆料的稳定性，进而制备出高孔隙率的泡沫陶瓷，采用没食子酸正丙脂（PG）修饰α-Al2 O3微粉颗粒，使其具有部分疏水性，采用发泡-冷冻干燥法制备了Al2 O3多孔陶瓷材料，主要研究了PG加入量（w，0．1％～2．0％）、料浆固含量（w，49．0％～61．9％）和烧成温度（1300～1500℃）对Al2O3多孔陶瓷材料性能的影响。结果表明：以没食子酸正丙脂（PG）作修饰剂，对α-Al2 O3微粉颗粒稳定气泡有良好的作用；当PG加入量为1．5％（w），固含量为58％（w），烧成温度为1500℃时，制备的Al2 O3多孔陶瓷材料的显气孔率为72％，体积密度为0．59 g·cm^-3，耐压强度为12．5 MPa。To enhance the stabilization of foam ceramic slurries and prepare foam ceramics with high porosi-ty,the porous Al2 O3 ceramics were prepared by foaming-freeze drying method using propyl gallate （PG） modified α-Al2 O3 micropowder with partial hydrophobicity.Effects of PG addition （0.1%-2.0%,in mass, the same hereinafter）,slurry solid content （49.0%-61.9%）and firing temperature （1 300-1 500 ℃）on properties of porous Al2 O3 ceramics were researched.The results show that PG modified the α-Al2 O3 mi-cropowder and well stabilizes the pores;when PG addition is 1.5%and solid content is 58%,the apparent porosity,bulk density and crushing strength of the prepared ceramics fired at 1 500 ℃ are 72%,0.59 g·cm ^-3 and 12.5 MPa,respectively.

关 键 词：没食子酸正丙酯(PG) 氧化铝多孔陶瓷 冷冻干燥 

分 类 号：TQ174[化学工程—陶瓷工业]