论文部分内容阅读
目的:研究氧化镧(La_2O_3)和纳米二氧化硅(SiO_2)对氧化锆陶瓷断裂韧性、抗弯强度及硬度的影响。方法:将La_2O_3和纳米SiO_2按照质量比分别为0、0;0.5 wt%、0;1 wt%、0;0、0.5 wt%;0、1 wt%;0.5 wt%、0.5wt%;0.5 wt%、1 wt%;1 wt%、0.5 wt%;1 wt%、1 wt%的比例添加到氧化锆陶瓷粉体中,依次为A组、B1组、B2组、C1组、C2组、D1组、D2组、D3组、D4组,制成不同规格的标准试件。检测并比较试验组及对照组的断裂韧性、抗弯强度和硬度数据,进行统计学分析。结果:通过加入La_2O_3和纳米SiO_2发现氧化锆复合陶瓷的性能得以改善,得到先增大后减小的数据。其中添加比例为0.5 wt% La_2O_3和1 wt%纳米SiO_2的D2组氧化锆复合陶瓷的综合性能最佳,其断裂韧性、抗弯强度及维氏硬度分别为(15.6978±0.2638)MPa.m1/2、(1236.5119±21.7971)MPa和(13.8801±0.2256)GPa(P<0.05)。结论:在氧化锆陶瓷粉体中添加不同比例的La_2O_3和纳米SiO_2可以改善氧化锆陶瓷断裂韧性、抗弯强度及硬度,为临床上氧化锆陶瓷修复失败提供参考。
Objective: To study the effects of lanthanum oxide (La_2O_3) and nano-silica (SiO_2) on the fracture toughness, flexural strength and hardness of zirconia ceramics. Methods: La 2 O 3 and nano-SiO 2 were prepared by the following methods: 0,0; 0.5 wt%, 0; 1 wt%, 0; 0,0.5 wt%; 0,1 wt%; 0.5 wt% 1% by weight, 1% by weight, 0.5% by weight, 1% by weight and 1% by weight in the zirconia ceramic powder, followed by Group A, Group B1, Group B2, Group C1, Group C2, Group, D2 group, D3 group, D4 group, made of different specifications of the standard specimen. The fracture toughness, flexural strength and hardness of the test group and the control group were tested and compared, and the data were analyzed statistically. Results: The performance of zirconia composite ceramics was improved by adding La 2 O 3 and nano-SiO 2, and the data first increased and then decreased. D2 group zirconia composite ceramic with 0.5 wt% La 2 O 3 and 1 wt% nano-SiO 2 had the best comprehensive properties, and its fracture toughness, flexural strength and Vickers hardness were (15.6978 ± 0.2638) MPa.m 1/2 , (1236.5119 ± 21.7971) MPa and (13.8801 ± 0.2256) GPa, respectively (P <0.05). Conclusion: Adding different proportions of La 2 O 3 and nano-SiO 2 to zirconia ceramic powders can improve the fracture toughness, flexural strength and hardness of zirconia ceramics and provide reference for the failure of zirconia ceramics in clinic.