A primary study into graphene/polyether ether ketone (PEEK) nanocomposite for laser sintering
A primary study into graphene/polyether ether ketone (PEEK) nanocomposite for laser sintering
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DOI：
10.1016/j.apsusc.2017.09.226
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发表时间：
2018-01-15
影响因子：
6.7
通讯作者：
Ghita, Oana
中科院分区：
文献类型：
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作者：
Chen, Binling;Berretta, Silvia;Ghita, Oana
本文提出了两种用于激光烧结的石墨烯/聚醚醚酮粉末的制备方法，并研究了它们的行为与其微观结构和性能的关系。为了复制粉末床过程中的薄层形成过程，制备了复合薄膜。两种复合粉末制备方法(湿法和干法)在石墨烯纳米片(GNP)含量分别为0.1wt%和0.5wt%时，均能提高复合膜的力学性能。透射电子显微镜照片表明，GNP在PEEK结晶过程中起成核点的作用，位于球晶的中心。热台显微镜显示，与普通的PEEK相比，GNP/PEEK纳米复合材料的合并开始时间推迟了20 S。这对于激光烧结来说是一个非常重要的观察，因为它将影响构建策略和特定参数(例如，层之间的沉积时间、多次曝光)。当GNP含量高于1wt%时，石墨烯在纳米复合薄膜中具有显著的导电性能。(C)2017年作者。爱思唯尔出版公司(Elsevier B.V.)
This paper proposes two methods of preparation of graphene/PEEK powders for Laser Sintering (LS) and investigates their behaviour in relation to their microstructure and their properties. Thin composite films were fabricated in an attempt to replicate the thin layer formation of the powder bed process. Both methods of composite powder preparation (wet and dry) led to enhanced mechanical performance of the composite films at 0.1 and 0.5 wt% graphene nano-platelets (GNP) concentrations. The TEM images show that the GNP act as a nucleation point in crystallisation of PEEK, being at the centre of the spherulites. The hot stage microscopy reveals a 20 s delay in the onset of GNP/PEEK nanocomposite coalescence in comparison with plain PEEK. This is a very important observation for laser sintering, as it will influence the build strategy and specific parameters (e.g. time between layers deposition, multiple exposures). The excellent electrical conductivity properties of graphene were noticeable in the nanocomposite films at concentrations above 1 wt% GNP. (C) 2017 The Authors. Published by Elsevier B.V.