氧化钇稳定氧化锆多孔陶瓷的制备与性能

以叔丁醇为溶剂,采用凝胶注模成型方法,制备出防/隔热的摩尔分数为8%Y_2O_3-ZrO_2(8YSZ)多孔陶瓷.在浆料中初始固相含量固定为10%体积分数的基础上,研究了烧结温度对8ySZ陶瓷材料的气孔率、开气孔率、孔径尺寸分布及显微结构的影响,分析了压缩强度、热导率与结构之间的关系.通过改变烧结温度,所制备的8YSZ多孔陶瓷的气孔率为65%～74%,孔隙分布均匀,平均孔径为0.68～1.82μm,压缩强度为7.92～13.15 MPa,室温热导率最低可达0.053 W/(m·K)],比相应的致密陶瓷～2.2 W/(m·K)]低一个数量级,且随着气孔率的增加而降低.

FabricationandPropertiesofPorousYttria-StabilizedZirconiaCeramics

Porous yttria-stabilized zirconia (8 mol% Y_2O_3 -ZrO_2, 8YSZ) ceramics was fabricated by tert-butyl alcohol (TBA)-based gel-casting process. At a fixed solid loading of 10 vol% of the initial slurry, the influence of sintering temperature on the porosity, open porosity, pore size distribution and microstructure was discussed. The relationship between compressive strength, room temperature thermal conductivity and microstructure was also discussed. Porous 8YSZ ceramics with high porosity ranging from 65% to 74% was fabricated by adjusting sintering temperature. A uniform pore size distribution was observed, and the mean pore size ranged from 0.68 to 1.82 μm. The compressive strengths of porous 8YSZ ceramics were between 7.92 and 13.15 MPa. The thermal conductivity of porous 8YSZ ceramics at room temperature (as low as 0.053 W/m·K) was one order of magnitude lower than that of dense 8YSZ ceramics ( ～2.2 W/m·K), and decreased with increasing sintering temperature.