【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-Al2O3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Al2O3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(1 300~1 500℃)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-Al2O3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1 500℃时,制备的Al2O3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。更多还原

【Abstract】 To enhance the stabilization of foam ceramic slurries and prepare foam ceramics with high porosity,the porous Al2O3 ceramics were prepared by foaming-freeze drying method using propyl gallate(PG)modified α-Al2O3 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 Al2O3 ceramics were researched. The results show that PG modified the α-Al2O3 micropowder 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. 59g·cm- 3and 12. 5 MPa,respectively.更多还原