纳米氧化锆增韧牙科用硅藻土陶瓷的性能

Properties of nano-zirconia toughened diatomite ceramic for dentistry

探讨了不同含量纳米氧化锆颗粒对牙科用硅藻土陶瓷的增韧增强作用.在硅藻土陶瓷基体原料中添加纳米氧化锆颗粒（w（ZrO2）=0-30%）,复合粉体经球磨、烘干、研磨、过筛后压制成型,然后于1 100℃常压高温烧结.制得样品经打磨抛光后采用三点弯曲法和压痕法测试陶瓷的力学性能,并利用X射线衍射仪和扫描电子显微镜分析其物相组成和显微结构.实验结果表明,当w（ZrO2）=20%时,硅藻土陶瓷的增韧效果最为明显,三点抗弯强度提高130%,断裂韧性提高30%,硬度则提高较少.经过纳米氧化锆增强增韧的硅藻土陶瓷满足牙科用全瓷材料性能的基本要求.

The toughening and strengthening effects of different contents of nano-zirconia on diatomite ceramics are investigated.Zirconia nanoparticles are added to the diatomite ceramic matrix materials（w（ZrO2）=0 to 30%）.After balling,drying,grinding and riddling,the composite ceramics are pressed by a bead machine,and then the obtained greenwares are sintered under atmospheric pressure at 1 100℃.After milling and polishing,the mechanical properties of the sintered samples are tested using the three-point method and the indentation method.The phases and microstructures of the composite ceramics are studied by X-ray diffraction and scanning electron microscope,respectively.The experimental results indicate that when w（ZrO2）=20%,the toughening effect of diatomite ceramic is obvious.Correspondingly,the flexural strength and the fracture toughness increase 130% and 30% respectively,while the hardness increases a little.The nano-zirconia toughened diatomite ceramic meets the basic requirements of dental machinable ceramics.