【摘要】 目的:观察不同粒径的纳米ZrO₂ 填料对SiO₂复合树脂的弯曲强度和抗压强度的影响，探究纳米ZrO₂的最佳粒径。方法:将经过硅烷偶联化的不同粒径的纳米ZrO₂颗粒加入SiO₂复合树脂中，合成ZrO₂ 质量分数相同，粒径分别为20 nm, 50 nm, 70 nm, 100 nm的ZrO₂/SiO₂复合树脂，分别为B、C、D、E组；纯SiO₂组为A组（对照组）。将试件固定于万能试验机上，以1.0 mm/min的速度垂直加压直至试样破坏，在树脂材料断裂后，对断裂面进行扫描电镜观察，并对不同组别的材料进行XRD扫描测试。结果:B组弯曲强度最高，与其他4组均有统计学差异（P<0.05）;C、D、E 3组无显著性差异，与A组差异明显（P<0.05）。B组抗压强度最高，与其他4组均有统计学差异（P<0.05）。结论:粒径为20 nm的ZrO₂在一定范围内能够提高SiO₂复合树脂的弯曲强度和抗压强度。更多还原

【Abstract】 Objective:To observe the effect of nano-ZrO₂ fillers with different particle sizes on the flexural strength and compressive strength of SiO₂ composite resin and to explore the optimal particle size of nano-ZrO₂.Methods:The nano-ZrO₂ particles with different particle sizes coupled by silane were added into SiO₂ composite resin, and ZrO₂/SiO₂ composite resins with the same mass fraction of ZrO₂,but particle sizes of 20 nm, 50 nm, 70 nm and 100 nm were synthesized, which were B,C,D,E group and pure SiO₂ group A（control group）.Each group of test pieces was fixed on the universal material testing machine, and vertically pressurized at the speed of 1.0 mm/min until the sample was destroyed.After the fracture of the resin material, the fracture surface was observed by SEM,and the different groups of materials were tested by XRD scanning.Results:The bending strength of group B was the highest, and there were statistical differences with the other four groups（P<0.05）.There was no significant difference among group C,group D and group E,which was significantly different from group A（P<0.05）.The compressive strength of group B was the highest, with statistical differences with the other four groups（P<0.05）.Conclusion:ZrO₂ with particle size of 20 nm can improve the flexural strength and compressive strength of SiO₂ composite resin in a certain range.更多还原