scholarly journals Powder bed binder jetting additive manufacturing of silicone structures

2018 ◽  
Vol 21 ◽  
pp. 112-124 ◽  
Author(s):  
Farzad Liravi ◽  
Mihaela Vlasea
Keyword(s):  
Additive Manufacturing ◽  
Powder Bed ◽  
Binder Jetting

Wire + Arc Additive Manufacturing of Metals

2020 ◽  
pp. 106-126
Author(s):  
Krishna Kishore Mugada ◽  
Aravindan Sivanandam ◽  
Ravi Kumar Digavalli
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Manufacturing Sector ◽  
Manufacturing Processes ◽  
Deposition Rates ◽  
Direct Energy Deposition ◽  
Powder Bed ◽  
Direct Energy ◽  
Wire Arc Additive Manufacturing ◽  
Binder Jetting

Wire + Arc additive manufacturing (WAAM) processes have become popular because of their proven capabilities to produce large metallic components with high deposition rates (promoted by arc-based processes) compared to conventional additive manufacturing processes such as powder bed fusion, binder jetting, direct energy deposition, etc. The applications of WAAM processes were constantly increasing in the manufacturing sector, which necessitates an understanding of the process capability to various metals. This chapter outlines the significant outcomes of the WAAM process for most of the engineering metals in terms of microstructure and mechanical properties. Discussion on various defects associated with the processed components is also presented. Potential application of WAAM for different metals such as aluminum and its alloys, titanium, and steels was discussed. The research indicates that the components manufactured by the WAAM process have significant microstructural changes and improved mechanical properties.

Binder Jetting Additive Manufacturing of Metals: A Literature Review

2019 ◽  
Author(s):  
Ming Li ◽  
Wenchao Du ◽  
Alaa Elwany ◽  
Zhijian Pei ◽  
Chao Ma
Keyword(s):  
Additive Manufacturing ◽  
Dimensional Accuracy ◽  
Binding Agent ◽  
Metal Part ◽  
Spreading Process ◽  
Powder Bed ◽  
The Past ◽  
Wide Range ◽  
Binder Jetting ◽  
Two Parameter

Abstract Binder jetting, also known as 3D printing, is an additive manufacturing (AM) technology utilizing a liquid-based binding agent to selectively join the material in a powder bed. It is capable of manufacturing complex-shaped parts with a variety of materials. This paper provides an overview of binder jetting of metals with a discussion about the knowledge gaps and research opportunities. The review deals with two parameter categories in terms of the material and process and their impacts. The achieved density, dimensional accuracy, and mechanical strength are summarized and analyzed. Further in-depth consideration of densification is discussed corresponding to various attributes of the packing, printing, and sintering behaviors. Though binder jetting has attracted increasing attention in the past several years, this fabrication process is not well studied. The understanding of powder spreading process and binder-powder interaction is crucial to the development of binder jetting but insufficient. In addition, the lack of investigation on the mechanical behavior of binder jetting metal part restricts the actualization of its wide-range applications.

scholarly journals Additive Manufacturing Processes in Medical Applications

Materials ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 191
Author(s):  
Mika Salmi
Keyword(s):  
Additive Manufacturing ◽  
Energy Deposition ◽  
Manufacturing Processes ◽  
Medical Applications ◽  
Powder Bed Fusion ◽  
Powder Bed ◽  
Material Extrusion ◽  
Fusion Material ◽  
Directed Energy ◽  
Binder Jetting

Additive manufacturing (AM, 3D printing) is used in many fields and different industries. In the medical and dental field, every patient is unique and, therefore, AM has significant potential in personalized and customized solutions. This review explores what additive manufacturing processes and materials are utilized in medical and dental applications, especially focusing on processes that are less commonly used. The processes are categorized in ISO/ASTM process classes: powder bed fusion, material extrusion, VAT photopolymerization, material jetting, binder jetting, sheet lamination and directed energy deposition combined with classification of medical applications of AM. Based on the findings, it seems that directed energy deposition is utilized rarely only in implants and sheet lamination rarely for medical models or phantoms. Powder bed fusion, material extrusion and VAT photopolymerization are utilized in all categories. Material jetting is not used for implants and biomanufacturing, and binder jetting is not utilized for tools, instruments and parts for medical devices. The most common materials are thermoplastics, photopolymers and metals such as titanium alloys. If standard terminology of AM would be followed, this would allow a more systematic review of the utilization of different AM processes. Current development in binder jetting would allow more possibilities in the future.

Metal Binder Jetting Additive Manufacturing: A Literature Review

2020 ◽  
Vol 142 (9) ◽  
Author(s):  
Ming Li ◽  
Wenchao Du ◽  
Alaa Elwany ◽  
Zhijian Pei ◽  
Chao Ma
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Related Factors ◽  
Powder Bed ◽  
Metal Binder ◽  
Powder Packing ◽  
Superior Mechanical Properties ◽  
Directed Energy ◽  
Reported Data ◽  
Binder Jetting

Abstract Binder jetting is an additive manufacturing process utilizing a liquid-based binding agent to selectively join the material in a powder bed. It is capable of manufacturing complex-shaped parts from a variety of materials including metals, ceramics, and polymers. This paper provides a comprehensive review on currently available reports on metal binder jetting from both academia and industry. Critical factors and their effects in metal binder jetting are reviewed and divided into two categories, namely material-related factors and process-related parameters. The reported data on density, dimensional and geometric accuracy, and mechanical properties achieved by metal binder jetting are summarized. With parameter optimization and a suitable sintering process, ten materials have been proven to achieve a relative density of higher than 90%. Indepth discussion is provided regarding densification as a function of various attributes of powder packing, printing, and post-processing. A few grades of stainless steel obtained equivalent or superior mechanical properties compared to cold working. Although binder jetting has gained its popularity in the past several years, it has not been sufficiently studied compared with other metal additive manufacturing (AM) processes such as powder bed fusion and directed energy deposition. Some aspects that need further research include the understanding of powder spreading process, binder-powder interaction, and part shrinkage.

Binder Jetting Additive Manufacturing of Ceramics: Analytical and Numerical Models for Powder Spreading Process

2019 ◽  
Author(s):  
Guanxiong Miao ◽  
Wenchao Du ◽  
Zhijian Pei ◽  
Chao Ma
Keyword(s):  
Additive Manufacturing ◽  
Numerical Models ◽  
Ceramic Materials ◽  
Low Density ◽  
Forming Process ◽  
Spreading Process ◽  
Powder Bed ◽  
Complex Shapes ◽  
Part Density ◽  
Binder Jetting

Abstract Binder jetting additive manufacturing is a promising way to process ceramic materials which are hard to be manufactured into complex shapes using conventional methods. However, the application of binder jetting is limited by the relatively low density of manufactured parts. Powder bed forming process is a critical step that determines the powder bed density and consequently the part density. Thus, investigating and understanding the power spreading process is necessary to improve the part density. A numerical model is developed to predict the powder bed density under different spreading conditions using the discrete element method (DEM). The predicted DEM results are compared with the prediction of an analytical model. The results show that under different layer thicknesses (50 μm, 70 μm, 100 μm) and roller diameters (12 mm, 14 mm, and 16 mm), the predicted maximum powder bed density by these two models has nearly the same value and the predicted maximum packing stress has the same trend.

Model Guided Mixing of Ceramic Powders With Graded Particle Sizes in Binder Jetting Additive Manufacturing

2018 ◽  
Author(s):  
Wenchao Du ◽  
Xiaorui Ren ◽  
Yexiao Chen ◽  
Chao Ma ◽  
Miladin Radovic ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Packing Density ◽  
Ternary Mixture ◽  
Sintered Density ◽  
Selection Process ◽  
Ternary Mixtures ◽  
Particle Sizes ◽  
Mixed Powder ◽  
Powder Bed ◽  
Binder Jetting

Binder jetting additive manufacturing is a promising technology for fabricating ceramic parts with complex or customized geometries. However, this process is limited by the relatively low density of the fabricated parts even after sintering. This paper reports a study on effects of mixing powders with graded particle sizes on the powder bed packing density and consequently the sintered density. For the first time, a linear packing model, which can predict the packing density of mixed powders, has been used to guide the selection of particle sizes and fractions of constituent powders. A selection process was constructed to obtain the maximum mixed packing density. In the part of model validation, three types of alumina powders with average sizes of 2 μm, 10 μm, and 70 μm, respectively, were mixed in optimum volumetric fractions that could lead to the maximum packing density based on model predictions. Powder bed packing density was measured on binary mixtures, ternary mixture, and each constituent powders. Furthermore, disk-shaped samples were made, using binder jetting additive manufacturing, from each constituent and mixed powder. Results show that binary and ternary mixtures have higher powder bed packing densities and sintered densities than the corresponding constituent powders. The disks made from the ternary mixture achieved the highest sintered density of 65.5%.

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