Vat photopolymerization of Nb2O5-Doped 3Y-TZP ceramics: Correlation between microstructure, mechanical properties, and aging resistance

IF 3.5 2区医学 Q2 ENGINEERING, BIOMEDICAL

Journal of the Mechanical Behavior of Biomedical Materials Pub Date : 2025-09-22 DOI:10.1016/j.jmbbm.2025.107209

Zhiquan Huang , Yang Sheng , Li Wang , Yannan Cao , Rui Dou , Fangyong Zhu

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引用次数: 0

Abstract

In this study, 3 mol% yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP) ceramics with four levels of Niobium pentoxide (Nb₂O₅) doping (0, 0.3, 0.6, and 1.2 wt%) were fabricated using vat photopolymerization (VPP) and subsequently sintered at 1500 °C. The influence of Nb₂O₅ doping on the phase composition, microstructure, mechanical properties, and hydrothermal aging behavior of the ceramics was investigated. All ceramic pastes showed similar rheological behavior, and no significant difference were observed in shrinkage during sintering. X-ray diffraction revealed an increase in monoclinic phase content with increasing Nb₂O₅ doping (from 1.03 wt% to 37.60 wt% m-ZrO₂). SEM analysis showed grain growth from 0.433 to 0.558 μm with increasing dopant content. Mechanical testing revealed that low Nb₂O₅ doping (0.3 wt%) significantly improved fracture toughness (from 4.36 to 7.52 MPa m¹/²), while higher doping levels led to a decline in flexural strength (from 999.68 to 380.23 MPa) and hardness (from 12.71 to 9.51 GPa). Accelerated aging tests (134 °C/0.2 MPa, for up to 50 h) demonstrated that Nb₂O₅ addition promoted t→m transformation, increasing monoclinic content and surface roughness, ultimately reduced aging stability. These results highlight a trade-off between improved toughness and hydrothermal degradation in Nb₂O₅-doped 3Y-TZP ceramics prepared by VPP.

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nb2o5掺杂3Y-TZP陶瓷的还原光聚合：微观结构、力学性能和耐老化性能的相关性。

在本研究中，采用还原光聚合（VPP）法制备了四种浓度（0、0.3、0.6和1.2 wt%）的氧化钇稳定的四方氧化锆多晶（3Y-TZP）陶瓷，并在1500℃下烧结。研究了Nb2O5的掺杂对陶瓷的相组成、微观结构、力学性能和水热时效行为的影响。所有陶瓷浆料均表现出相似的流变特性，烧结过程中的收缩率无显著差异。x射线衍射显示，随着Nb2O5掺杂量的增加，单斜相含量增加（m-ZrO2从1.03 wt%增加到37.60 wt%）。SEM分析表明，随着掺杂量的增加，晶粒尺寸从0.433 μm增大到0.558 μm。力学测试表明，低Nb2O5掺杂量（0.3 wt%）显著提高了材料的断裂韧性（从4.36提高到7.52 MPa m1/2），而高Nb2O5掺杂量导致材料的抗弯强度（从999.68降低到380.23 MPa）和硬度（从12.71降低到9.51 GPa）下降。加速老化试验（134°C/0.2 MPa，长达50 h）表明，Nb2O5的加入促进了t→m转变，增加了单斜晶含量和表面粗糙度，最终降低了老化稳定性。这些结果强调了VPP制备的nb2o5掺杂3Y-TZP陶瓷在提高韧性和水热降解之间的权衡。

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来源期刊

Journal of the Mechanical Behavior of Biomedical Materials 工程技术-材料科学：生物材料

CiteScore

7.20

自引率

7.70%

发文量

505

审稿时长

46 days

期刊介绍： The Journal of the Mechanical Behavior of Biomedical Materials is concerned with the mechanical deformation, damage and failure under applied forces, of biological material (at the tissue, cellular and molecular levels) and of biomaterials, i.e. those materials which are designed to mimic or replace biological materials. The primary focus of the journal is the synthesis of materials science, biology, and medical and dental science. Reports of fundamental scientific investigations are welcome, as are articles concerned with the practical application of materials in medical devices. Both experimental and theoretical work is of interest; theoretical papers will normally include comparison of predictions with experimental data, though we recognize that this may not always be appropriate. The journal also publishes technical notes concerned with emerging experimental or theoretical techniques, letters to the editor and, by invitation, review articles and papers describing existing techniques for the benefit of an interdisciplinary readership.