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Modified 3D printed powder to cement-based material and mechanical properties of cement scaffold used in 3D printing

机译：将3D打印粉末改性为水泥基材料和3D打印中使用的水泥支架的机械性能

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Additive manufacturing is a common technique used to produce 3D printed structures. These techniques have been used as precise application geometry in different fields such as architecture and medicine, and the food, mechanics and chemical industries. However, in most cases only a limited amount of powder has been used to fabricate scaffold (structure). In this study, a unique mix of cements (calcium aluminate cement passed through a 150 gm sieve and ordinary Portland cement) was developed for Z-Corporation's three-dimensional printing (3DP) process. This cement mix was blended and the resulting composite powders were printed with a water-based binder using a Z-Corporation 3D printer. Moreover, some samples were added lithium carbonate to reduce the setting time for the cement mixture. The aims of the study were to firstly, find the proper cementitious powder close to the targeted powder (Z-powder); and secondly, evaluate the mechanical properties of this material. Cubic specimens of two different batches With varying saturation levels were cast and cured in various scenarios to enhance the best mechanical properties. The samples were characterised by porosity analyses, compression tests, Olympus BX61 Microscope imaging, 3D profiling Veeco (Dektak) and the Scanning Electronic Microscope (SEM). The maximum compressive strength of the cubic specimens for cementitious 3DP was 8.26 MPa at the saturation level of 170% for both the shell and core. The minimum porosity obtained was 49.28% at the saturation level of 170% and 340% for the shell and the core, respectively. (C) 2017 Elsevier Ltd. All rights reserved.
机译：增材制造是用于生产3D打印结构的常用技术。这些技术已在诸如建筑和医学以及食品，机械和化学工业等不同领域中用作精确的应用几何。然而，在大多数情况下，仅使用有限量的粉末来制造支架（结构）。在这项研究中，为Z-Corporation的三维打印（3DP）工艺开发了独特的水泥混合物（通过150克筛的铝酸钙水泥和普通的波特兰水泥）。混合这种水泥混合物，并使用Z-Corporation 3D打印机将所得的复合粉末与水基粘合剂一起印刷。此外，向一些样品添加碳酸锂以减少水泥混合物的凝固时间。研究的目的是：首先，找到接近目标粉末（Z-粉末）的合适胶凝粉末；其次，评估这种材料的机械性能。在各种情况下铸造和固化具有不同饱和度水平的两个不同批次的立方试样，以增强最佳机械性能。通过孔隙率分析，压缩测试，Olympus BX61显微镜成像，3D轮廓Veeco（Dektak）和扫描电子显微镜（SEM）对样品进行表征。胶结3DP立方试样的最大抗压强度在壳和核的饱和度为170％时均为8.26 MPa。壳和核的饱和度分别为170％和340％时，获得的最小孔隙率为49.28％。 （C）2017 Elsevier Ltd.保留所有权利。

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