GRAiL

GRAIL

• 批准号: 710676
• 金额: $ 6.3万
• 依托单位: RAPID POWDERS LIMITED
• 依托单位国家: 英国
• 项目类别: GRD Proof of Concept
• 财政年份: 2015
• 资助国家: 英国
• 起止时间: 2015 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=710676
• 关键词: GRAiL

Additive Manufacturing AM is used to build physical models, prototypes, patterns, andproduction parts in a wide variety of materials (in particular plastic, and metals) for a widerange of markets (AppA). Components in digital format are rendered into thin horizontalsections and using various techniques (e.g. Selective Laser Sintering (SLS), VatPhotopolymerisation, Material Extrusion and Powder Bed Fusion) material is added layer bylayer to build the component. SLS which utilises lasers to melt layers of metal or polymerpowder on to each other (AppA) was developed in 1984 and since the patents expired and theprice and availability of these machines has dropped dramatically, further stimulatingdemand. Initially, polymer SLS systems used amorphous polymers (ABS) with a broadmelting range but today almost all polymer SLS systems use crystalline polymers with a sharpmelting point (typically Nylon PA12) and the powder is melted. Unfortunately SLS polymerproperties are diminished compared to conventional extruded material.Fibrous fillers can improve toughness but the nylon has to be compounded and then cryogroundor milled producing angular surfaces on the powder which restrict its flowcharacteristics. Rapid Powders has a proprietary process whereby precipitated sphericalpowders can be coated with a wide range of filler materials (including nano-fillers) and inparticular Graphene which is a desirable filler for polymer nanocomposites and improves theirmechanical properties. We propose to prove the concept of the production of a range of PA12graphene nanocomposite powders with good flow characteristics that when melted or sinteredin a SLS machine have improved properties comparable to extruded PA12 enabling the SLSproduction of finished components.

增材制造AM用于为广泛的市场（AppA）构建各种材料（特别是塑料和金属）的物理模型、原型、图案和生产部件。数字格式的组件被渲染成薄的水平截面，并使用各种技术（例如选择性激光烧结（SLS），Vat Photopolymerisation，材料挤出和粉末床融合）逐层添加材料以构建组件。SLS利用激光将金属或聚合物粉末层相互熔化（AppA）于1984年开发，由于专利到期，这些机器的价格和可用性急剧下降，进一步刺激了需求。最初，聚合物SLS系统使用具有宽熔点范围的无定形聚合物（ABS），但今天几乎所有的聚合物SLS系统都使用具有尖锐熔点的结晶聚合物（通常为尼龙PA12），并且粉末被熔化。不幸的是，SLS聚合物的性能与传统的挤出材料相比有所降低。纤维填料可以提高韧性，但尼龙必须复合，然后低温研磨，在粉末上产生有角度的表面，这限制了其流动特性。Rapid Powders拥有专有的工艺，沉淀的球形粉末可以涂上各种填料（包括纳米填料），特别是石墨烯，它是聚合物纳米复合材料的理想填料，并改善其机械性能。我们建议证明生产一系列具有良好流动特性的PA12石墨烯纳米复合材料粉末的概念，当在SLS机器中熔化或烧结时，具有与挤出的PA12相当的改进的性能，从而能够实现SLS成品组件的生产。