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首页> 美国卫生研究院文献>Polymers >Graphite Modified Polylactide (PLA) for 3D Printed (FDM/FFF) Sliding Elements
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Graphite Modified Polylactide (PLA) for 3D Printed (FDM/FFF) Sliding Elements

机译：用于3D打印（FDM / FFF）滑动元件的石墨改性聚丙交酯（PLA）

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摘要

With the development of 3D printing technology, there is a need to produce printable materials with improved properties, e.g., sliding properties. In this paper, the authors present the possibilities of producing composites based on biodegradable PLA with the addition of graphite. The team created composites with the following graphite weight contents: 1%, 2.5%, 5%, 7.5%, and 10%. Neat material was also subjected to testing. Tribological, mechanical, and chemical properties of the mentioned materials were examined. Measurements were also made after keeping the samples in ageing and climatic ovens. Furthermore, SEM observations of samples before and after friction tests were carried out. It was demonstrated that increasing graphite content caused a significant decrease in wear (PLA + 10% graphite had a wear rate three times lower than for a neat material). The addition of graphite did not adversely affect most of the other properties, but it ought to be noted that mechanical properties changed significantly. After conditioning in a climatic oven PLA + 10% graphite has (in comparison with neat material) 11% lower fracture stress, 47% lower impact strength, and 21% higher Young’s modulus. It can be certainly stated that the addition of graphite to PLA is a step towards obtaining a material that is low-cost and suitable for printing sliding spare parts.
机译：随着3D打印技术的发展，需要生产具有改善的性质例如滑动性质的可印刷材料。在本文中，作者们提出了在添加石墨的情况下基于可生物降解的PLA生产复合材料的可能性。该团队创建了具有以下石墨重量含量的复合材料：1％，2.5％，5％，7.5％和10％。整洁的材料也进行了测试。检查了上述材料的摩擦学，机械和化学性质。将样品放在老化和气候烘箱中后，还要进行测量。此外，在摩擦试验之前和之后进行样品的SEM观察。事实证明，增加石墨含量会大大降低磨损（PLA + 10％石墨的磨损率是纯材料的三倍）。石墨的添加不会对大多数其他性能产生不利影响，但应注意的是，机械性能发生了显着变化。在气候烤箱中进行调节后，PLA + 10％的石墨（与纯材料相比）的断裂应力降低了11％，冲击强度降低了47％，杨氏模量提高了21％。可以肯定地说，向PLA添加石墨是迈向获得低成本且适合印刷滑动零件的材料的一步。

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