氧化铝-氧化锆纳米复合渗透陶瓷力学性能与微观结构的研究

目的　利用ZrO2 相变和微粉的纳米效应对氧化铝复合渗透陶瓷增强增韧 ,并对其化学组分、复合体的微观结构与复合体系力学特性的相互关系进行探讨。方法　制备氧化铝-氧化锆纳米复合渗透陶瓷 ,测试其抗弯强度和断裂韧性 ;采用X射线衍射分析测定其晶相组成 ;扫描电镜观察其显微结构。结果　氧化铝-氧化锆纳米复合渗透陶瓷三点弯曲强度测试的平均值高达 (6 1 0 85± 37 0 7)MPa,单边切口梁法测定断裂韧性的平均值高达(6 5 1± 1 38)MPa·m1 2 ,复合陶瓷的主晶相为α_Al2 O3及TZP-ZrO2 。结论　氧化铝-氧化锆纳米复合渗透陶瓷是一种力学性能优良的新型渗透陶瓷材料 ,展示出良好的临床应用前景。

A Study on the Mechanical Properties and Microstructure of Alumina-zirconia Nano-composite Infiltrated Ceramic

OBJECTIVE: To evaluate the mechanical properties and microstructure of a new dental full-ceramic material: alumina-zirconia nano-composite infiltrated ceramic. METHODS: The flexural strength was tested with three-point bending method and the fracture toughness with single edge notch bend (SENB) method. The composition of crystal phases in the infiltrated ceramic was analyzed by X-ray diffraction (XRD). The microstructure of the infiltrated ceramic was examined by scanning electronic microscope (SEM). RESULTS: The average three-point flexural strength of the material was (610.85 +/- 37.07) MPa and the average fracture toughness determined by SENB method was (6.51 +/- 1.38) MPa.m1/2. The main crystal phases in this composite ceramic were alpha-Al2O3 and TZP-ZrO2. CONCLUSION: Alumina-zirconia nano-composite infiltrated ceramic is a new infiltrated ceramic with favorable mechanical properties. It demonstrated a promising future for clinical application.