Article
Materials Science, Multidisciplinary
Sergi Bafaluy Ojea, Jordina Torrents-Barrena, Maria Teresa Perez-Prado, Rocio Munoz Moreno, Federico Sket
Summary: The 3D binder jet technology is gaining popularity due to its ability to create complex shapes with various powders and no high energy sources. The focus of current research is on the relationship between printing parameters, macroscopic properties, and microstructures of sintered parts. However, there is a gap in knowledge regarding the relationship between process parameters and the microstructure of green parts. This study presents a novel green microstructural analysis methodology using SEM and XCT, along with machine learning algorithms, to analyze images and understand the consolidation mechanisms of green parts. The methodology aims to model and predict the macroscopic properties of sintered parts for process acceleration.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Ceramics
Yayun Liu, Chuanyang Wang, Kedong Zhang
Summary: Al2O3-based green ceramics are prepared by isostatic cold pressing and laser sintering, with properties and quality influenced by pre-sintering temperatures and laser parameters. Higher pre-sintering temperatures result in better crystallinity, density, and flexural strength. Different microstructures are observed in samples pre-sintered at various temperatures after laser sintering.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Review
Materials Science, Multidisciplinary
Ze-Chen Fang, Zhi-Lin Wu, Chen-Guang Huang, Chen-Wu Wu
Summary: A micro-scale thermodynamic model was developed to predict the microstructure and internal stress evolution in parts fabricated by SLM. The study found that using a symmetrical multi-path scanning strategy can relieve residual stress and homogenize microstructure.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Xueping Lu, Wenbin Lu, Jie Gao, Yongping Liu, Jilong Huang, Peng Yan, Yuchi Fan, Wan Jiang
Summary: It has been discovered that the cold sintering process (CSP) can serve as a green and cost-effective technology for preparing advanced polycrystalline thermoelectric (TE) materials. By using solvothermal precursors as liquid sintering aids, the CSP-densified materials show comparable or even better performance compared to materials prepared by spark plasma sintering (SPS). This remarkable performance is attributed to the distinct densification procedure in CSP.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Ceramics
Kedarnath Rane, Muhammad Asad Farid, Waqar Hassan, Matteo Strano
Summary: The study found that the part orientation has a significant impact on the microhardness and flexural strength of alumina and zirconia. Parts with vertical orientation exhibit higher hardness, while horizontal orientation results in higher flexural strength.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Ahmet Cagri Kilinc, Ali Aydin Goktas, Ozgur Yasin Keskin, Serhan Koktas
Summary: The study successfully produced CuSn10 bronze alloy using FDM method and investigated the effect of printing parameters on its properties. By adjusting printing speed and layer thickness, the density and morphological properties of the product can be controlled effectively. Sintering temperature is a key parameter, with 900°C yielding the highest density and strength.
Article
Engineering, Manufacturing
Francesco Sillani, Samuel Poretti, Tommaso Pagani, Fatlind Hajdaj, Manfred Schmid, Andrea Randazzo, Matteo Pastorino, Konrad Wegener
Summary: Temperature monitoring during the cooldown in powder bed fusion of polymers is crucial for quality assurance and is an innovative approach in the field. This technology utilizes microwave tomography to assess the part cooldown history in an industry-grade EOS P110 machine, enabling relative and absolute temperature readings even for parts surrounded by powder. Experimental measurements revealed different cooldown rates depending on the polymer state: 0.56 degrees C min-1 in the liquid phase, 1.2 degrees C min-1 during supercooling, and 0.83 degrees C min-1 in the solid phase. This groundbreaking technology can contribute to the development of smarter PBF machines that can effectively control the entire PBF process, including the often overlooked cooldown phase which significantly impacts the final mechanical performance of parts.
ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Manufacturing
Paul Victor Osswald, Philip Obst, Gerardo A. Mazzei Capote, Martin Friedrich, Dominik Rietzel, Gerd Witt
Summary: Additive manufacturing techniques are attractive to various industries for producing complex geometries in compressed product development cycles, however, the stratified build approach used by these technologies leads to subpar mechanical properties at the junction of adjacent layers, making it difficult to assess the structural integrity of parts under complex loads. In the industrialization of series production of AM parts, understanding and predicting failure mechanisms under complex stress states become crucial.
ADDITIVE MANUFACTURING
(2021)
Article
Engineering, Mechanical
Ana C. Lopes, Alvaro M. Sampaio, Catia S. Silva, Antonio J. Pontes
Summary: This study validates a methodology to determine the minimum amount of virgin material needed to meet the operational specifications of SLS parts, ensuring sustainable management of processed powder and economic viability of the process through the use of theoretical prediction models.
RAPID PROTOTYPING JOURNAL
(2021)
Article
Engineering, Manufacturing
Samanwitha Kolli, Margherita Beretta, Ahmed Selema, Peter Sergeant, Leo A. I. Kestens, Marleen Rombouts, Jozef Vleugels
Summary: Investigation into the manufacturing of dense pure Cu components using the 3D micro-extrusion technology was conducted. The process involves extrusion of a high-viscosity powder-loaded suspension or paste at room temperature. The study focused on developing a complete processing route, optimizing printing parameters, and thermal post-processing conditions. The results showed that the technique successfully produced dense Cu components with high purity and good mechanical properties.
ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Chemical
Michael Wolf, Dietmar Drummer
Summary: Laser-sintering technology enables cost-effective production of complex and individualized components, while welding is essential for exploiting the advantages of laser-sintering in assemblies with mass-produced components. Low weld pressure can lead to high strength joints in PA12 laser-sintered and injection-molded parts.
POLYMER ENGINEERING AND SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Joao Vasconcelos, Manuel Sardinha, Carlos M. S. Vicente, Luis Reis
Summary: This research proposes the adaptation of the iro3d selective powder deposition process to produce glass-ceramic parts using recycled glass powders. Various deposition strategies were used to produce specimens and evaluate their geometric distortions and mechanical performance. The addition of sand was found to mitigate distortions. The results demonstrate the potential of the iro3d SPD process for additively manufacturing glass parts.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Manufacturing
Kedarnath K. Rane, Prashant P. Date, Girish N. Kotwal, Kanhu C. Nayak, T. S. Srivatsan
Summary: Sintering, the final step of Metal Injection Molding (MIM), plays a significant role in influencing the characteristics and performance of final products. This research investigates the impact of sintering parameters on dimensional stability and mechanical properties of parts with different shapes. The study found that parts produced using grinding sludge powder showed inferior sintering characteristics compared to those produced using carbonyl iron powder. Empirical relationships were developed to predict the properties of sintered products based on the sintering parameters employed.
MATERIALS AND MANUFACTURING PROCESSES
(2023)
Article
Materials Science, Multidisciplinary
Levent Urtekin, Fatih Bozkurt, Murat Canli
Summary: X-ray tomography was used to investigate internal defects of green parts produced with PIM, revealing the importance of analyzing possible defects in molded parts before applying ongoing processes to save time and costs. Defects like cracks, weld lines, bubbles, or gaps in green parts can affect the safety and strength of the final products.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Physical
Manuel Ortega Varela de Seijas, Andreas Bardenhagen, Thomas Rohr, Enrico Stoll
Summary: Indirect induction heating is proposed as an effective method to densify Fused Filament Fabricated (FFF) parts, achieving high densities without the need for part transportation. This simplifies the processing of metal parts produced through material extrusion additive manufacturing.
