多层陶瓷结构Al2O3-Fe2O3/3Y-TZP梯度复合陶瓷的制备及性能

为更好地实现口腔修复体的美学修复效果，采用掺杂不同含量Fe₂O₃（0.01wt%~0.09wt%）和Al₂O₃（0.1wt%）的3 mol% Y₂O₃稳定的ZrO₂（3Y-TZP）粉体为原料，经过铺粉、压制、烧结等工艺制得色度渐变的多层陶瓷结构Al₂O₃-Fe₂O₃/3Y-TZP梯度复合陶瓷。对该梯度复合陶瓷的色度分布、烧结性能和力学性能进行检测，同时研究了Fe₂O₃和Al₂O₃的掺杂对3Y-TZP陶瓷组织和性能的影响。结果表明，制得的Al₂O₃-Fe₂O₃/3Y-TZP梯度复合陶瓷色度由红黄向白色沿成分变化方向呈梯度变化，与天然牙齿色度分布规律一致；力学性能呈梯度变化并从无色端到有色端逐渐降低，但仍满足牙科使用需求（≥ 800 MPa）；在无色瓷层中掺杂微量Al₂O₃（0.1wt%）可以改善Al₂O₃-Fe₂O₃/3Y-TZP梯度复合陶瓷的烧结性能，避免在预烧结过程中发生开裂。微量Fe₂O₃和Al₂O₃的掺杂会促进其在烧结过程中的致密化及晶粒长大；微量Fe₂O₃（0.01wt%）和Al₂O₃（0.1wt%）的掺杂有助于提高3Y-TZP陶瓷的挠曲强度，然而随着Fe₂O₃掺杂量的继续增多（≤ 0.09wt%）挠曲强度降低。 

Preparation and properties of Al2O3-Fe2O3/3Y-TZP gradient composite ceramics with multilayer ceramic structure

In order to achieve a better close shade of artificial restoration match with natural dentition, a color-gradient 3 mol% Y₂O₃-stabilized ZrO₂ (3Y-TZP) ceramics for dental restoration was prepared by forming and sintering process with powders of Fe₂O₃ (0.01wt%-0.09wt%)-Al₂O₃ (0.1wt%)/3Y-TZP as the raw materials. Their colorimetric characterization, sintering performance, and mechanical properties were tested, and the effect of Fe₂O₃ and Al₂O₃ on 3Y-TZP ceramics was studied. The results show that the color of the gradient Al₂O₃-Fe₂O₃/3Y-TZP changing from saffron yellow to white gradually, which matches with the natural dentition. In addition, the doping of trace Al₂O₃ (0.1wt%) on uncolored porcelain layer can avoid the cracking between porcelain layers during the presintering process. The flexural strength changes of gradient and can meet the need of dental restoration (≥ 800 MPa). The doping of trace Fe₂O₃ (0.01wt%) and Al₂O₃ (0.1wt%) can improve the densification and grain growth during the sintering process. And the doping of trace Fe₂O₃ (0.01wt%) and Al₂O₃ (0.1wt%) in 3Y-TZP can increase the flexural strength of the Al₂O₃-Fe₂O₃/3Y-TZP, but the flexural strength decreases when more Fe₂O₃ is doped (≤ 0.09wt%) in 3Y-TZP.