State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, China.
J Mater Sci Mater Med. 2012 Feb;23(2):239-44. doi: 10.1007/s10856-011-4487-0. Epub 2011 Dec 6.
This work was to investigate the effect of zirconia nanoparticles content on microstructure and mechanical properties of glass-infiltrated alumina/zirconia composites (AZGs). A series of slip-cast zirconia-toughened alumina (ZTA) compacts containing 10, 20, 30 wt% nano-zirconia, respectively, were partially sintered at 1,250°C for 2 h, then infiltrated with lanthanum borosilicate glass of lower thermal expansion at 1,180°C for 4 h. A porosity ranging from 21 to 25% mainly with submicron pore size was demonstrated in the partially-sintered ZTAs. Homogeneous distribution and micro-crystallization of intergranular glass phase was showed in the AZGs. The mechanical strength and fracture toughness of AZGs increased with zirconia content, the maximum (633.5 ± 41.7, 6.7 ± 0.6 MPa m(0.5)) were obtained in 30 wt% zirconia group, which were significantly higher than those in 10 wt% zirconia group (P < 0.05). The improved mechanical performance of AZGs containing 30 wt% zirconia was attributed to their larger zirconia content as well as thinner intergranular glass film.
这项工作旨在研究氧化锆纳米粒子含量对玻璃渗透氧化铝/氧化锆复合材料（AZGs）的微观结构和力学性能的影响。采用 slip-cast 工艺制备了一系列分别含有 10wt%、20wt%和 30wt%纳米氧化锆的氧化锆增韧氧化铝（ZTA）生坯，在 1250°C 下部分烧结 2 小时，然后在 1180°C 下用低热膨胀的镧硼硅酸盐玻璃浸渗 4 小时。部分烧结的 ZTA 中显示出 21%至 25%的孔隙率，主要为亚微米孔径。AZGs 中显示出均匀分布和晶间玻璃相的微结晶。AZGs 的力学强度和断裂韧性随氧化锆含量的增加而提高，在 30wt%氧化锆组中获得最大值（633.5±41.7，6.7±0.6 MPa·m0.5），明显高于 10wt%氧化锆组（P<0.05）。含有 30wt%氧化锆的 AZGs 的力学性能得到提高，这归因于其较高的氧化锆含量和较薄的晶间玻璃膜。
