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首页> 美国卫生研究院文献>Polymers >Investigation of Impact Strength and Hardness of UHMW Polyethylene Composites Reinforced with Nano-Hydroxyapatite Particles Fabricated by Friction Stir Processing
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Investigation of Impact Strength and Hardness of UHMW Polyethylene Composites Reinforced with Nano-Hydroxyapatite Particles Fabricated by Friction Stir Processing

机译：搅拌摩擦法制备纳米羟基磷灰石颗粒增强UHMW聚乙烯复合材料的冲击强度和硬度研究

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The impact strength and surface properties of polymeric materials are of critical importance in various engineering applications. Friction stir processing (FSP) is a novel method for the fabrication of composite materials with superior mechanical properties. The main objective of this study is to investigate the impact strength and Rockwell hardness of UHMW polyethylene composites reinforced with nano-hydroxyapatite particles fabricated through FSP. The spindle speed (ω), tool traverse speed (f), volume fraction (v) of strengthening material and shoulder temperature (T) were key processing parameters. The analysis of variance (ANOVA) indicated that the selected processing parameters were significant. Microscopic investigations unveiled that high levels of (v, f) and low levels of (T, ω) caused agglomeration of the reinforcing particles and induced voids and channels, which consequently reduced the impact strength and hardness of the manufactured composite. However, medium conditions of processing parameters exhibited better distribution of particles with minimum defects, and hence resulted in better mechanical properties. Finally, the models to predict the impact strength and hardness are proposed and verified. Sets of process parameters favorable to maximize the impact strength and Rockwell hardness were worked out, which were believed to increase the impact strength, Rockwell hardness number, and ultimate tensile strength by 27.3%, 5.7%, and 11.2%, respectively.
机译：聚合物材料的冲击强度和表面性能在各种工程应用中至关重要。搅拌摩擦加工（FSP）是一种具有优异机械性能的新型复合材料制造方法。这项研究的主要目的是研究通过FSP制备的纳米羟基磷灰石颗粒增强的UHMW聚乙烯复合材料的冲击强度和洛氏硬度。主轴转速（ω），刀具移动速度（f），增强材料的体积分数（v）和肩部温度（T）是关键的加工参数。方差分析（ANOVA）表明所选的处理参数很重要。微观研究发现，高含量的（v，f）和低含量的（T，ω）会引起增强颗粒的团聚并引起空隙和通道，从而降低了复合材料的冲击强度和硬度。然而，加工参数的中等条件显示出具有更少缺陷的更好的颗粒分布，因此导致了更好的机械性能。最后，提出并验证了预测冲击强度和硬度的模型。制定了一系列有利于最大程度提高冲击强度和洛氏硬度的工艺参数，据信它们分别使冲击强度，洛氏硬度值和极限抗拉强度分别提高了27.3％，5.7％和11.2％。

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