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

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.