摘要
3YSZ陶瓷在应用于牙科领域时存在抗湿热老化性能差的缺陷。为了在不影响力学性能的前提下改善3YSZ陶瓷的抗湿热老化性能,使用Al_(2)O_(3)和La_(2)O_(3)对3YSZ进行不同比例的微量掺杂,并在1450℃下保温3 h以烧结致密。使用场发射扫描电镜观察了试样的微观形貌。测试了不同试样的硬度、韧性及相对密度。对试样进行了不同时长的湿热老化试验,以老化后试样中单斜相的含量和老化动力学参数为指标,对试样的抗湿热老化性能进行了评价。结果表明,随着掺杂量的提高,试样的抗湿热老化性能提高,断裂韧性逐渐下降,其中3Y-0.15Al-0.2La陶瓷含有24%(体积分数)的立方相,维氏硬度为(13.09±0.41) GPa,断裂韧性为(9.03±0.3) MPa·m^(1/2),经过200 h的湿热老化后,试样表面单斜相的饱和含量仅为24%(体积分数),兼具有良好的力学性能和抗湿热老化性能,有潜力成为一种应用于牙科领域的陶瓷修复体材料。
3YSZ ceramics exhibit inadequate poor resistance to hygrothermal aging when used in dental applications.To enhance the hygrothermal aging resistance of 3YSZ ceramics while maintaining their mechanical properties,3YSZ was micro-doped by Al_(2)O_(3) and La_(2)O_(3) in different ratios,and then sintered at 1450℃ for 3 h to achieve densification.The microscopic morphology of the samples was observed using field emission scanning electron microscopy.The hardness,toughness and rela-tive density of different samples were tested.The samples were subjected to hygrothermal aging tests with varying durations,and the resistance of the samples to hygrothermal aging was evaluated in terms of the content of monoclinic phase and aging ki-netic parameters in the aged samples.The results show that with the increase of the doping amount,the resistance of the sam-ples to hygrothermal aging increases and the fracture toughness gradually decreases,in which the 3Y-0.15Al-0.2La ceramic contains 24%(volume fraction)of cubic phase with Vickers hardness of(13.09±0.41)GPa and fracture toughness of(9.03±0.3)MPa·m^(1/2).After 200 h of hygrothermal aging,the saturation content of monoclinic phase on the surface remains at 24%(volume fraction),indicating excellent mechanical properties and hygrothermal aging resistance,making it a promising canidate as a ceramic restorative material in indentistry.
作者
高雄
景强
张永和
包金小
王青春
阮飞
宋希文
GAO Xiong;JING Qiang;ZHANG Yong-he;BAO Jin-xiao;WANG Qing-chun;RUAN Fei;SONG Xi-wen(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,China)
出处
《稀土》
北大核心
2025年第2期16-24,共9页
Chinese Rare Earths
基金
国家自然科学基金项目(51864038)
内蒙古自治区青年科技英才计划(NJYT-19-A20)
内蒙古自治区自然科学基金项目(2021MS02022)
关键词
3YSZ陶瓷
牙科修复体
湿热老化
力学性能
氧空位
3YSZ ceramics
dental restorative material
hygrothermal aging
mechanical properties
oxygen vacancy
