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目的研究纳米Si3N4纤维织布作为加强体对PMMA机械性能的影响。方法将预处理的纳米Si3N4纤维织布,经室温固化和加热固化制样各成三组Si3N4织布/PMMA复合试件,厚度分别为1.0 mm,1.5mm,2.0 mm。未添加织布的为对照组,通过万能试验机测定并比较分析不同厚度的织布增强树脂基托的挠曲强度和杨氏弹性模量。结果无论是常温固化还是加热固化条件下,添加织布的复合材料厚度为2.0mm时,其挠曲强度和弹性模量达到最大,机械性能达到最佳,与对照组相比差异具有统计学意义(P<0.01);相比于室温固化条件,纳米Si3N4纤维织布增强基托树脂机械性能的提高在加热固化条件下更易实现。结论合理添加纳米Si3N4纤维织布形成合适厚度的基托复合体材料,其挠曲强度和弹性模量可以得到大幅提高,当复合材料厚度为2.0mm,其机械性能达到最佳,尤以加热固化条件下明显。
Aim To study the effect of nano-Si3N4 fiber cloth as reinforcement on the mechanical properties of PMMA. Methods Three kinds of Si3N4 woven fabric / PMMA composite specimens were pretreated with nano-Si3N4 fiber cloth at room temperature and then cured by heating. The thicknesses were 1.0 mm, 1.5 mm and 2.0 mm respectively. The control group was not added with woven fabric. The flexural strength and Young’s modulus of the resin-reinforced resin-based brackets with different thickness were measured and compared by universal testing machine. Results The flexural strength and elastic modulus of the composite with the addition of woven fabric reached the maximum at 2.0mm, and the mechanical properties reached the best at either room temperature curing or heat curing conditions, and the difference was statistically significant compared with the control group (P <0.01). Compared with the curing conditions at room temperature, the improvement of the mechanical properties of nano-Si3N4 fiber-reinforced base resin is easier to achieve under the condition of heat-curing. Conclusion The reasonable addition of nano-Si3N4 fiber cloth to form a suitable thickness of the base-matrix composite material, the flexural strength and elastic modulus can be greatly improved, when the composite thickness of 2.0mm, its mechanical properties to achieve the best, especially in the heat curing Condition obvious.