Article
Engineering, Manufacturing
P. Navarrete-Segado, C. Frances, M. Tourbin, C. Tenailleau, B. Duployer, D. Grossin
Summary: This paper focuses on the tailoring of calcium phosphate powders for their use in powder bed selective laser process feedstock. Through the addition of graphite as a laser absorptance additive, the processing window of the powder blends containing different amounts of graphite was increased, making the powder without additive non-processable. The study also showed the phase transition of hydroxyapatite while chlorapatite remained thermally stable during the whole process. Another study evaluated the production of solid and complex parts using a powder blend of hydroxyapatite and graphite. The microstructure and mechanical properties of the samples were analyzed, and the bioactivity of the bioceramic scaffolds was improved through a post-treatment process. These findings are expected to contribute to bone tissue engineering using powder bed selective laser processing of calcium phosphate powders.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Composites
Jianshuo Li, Wei Wu, Huanbo Hu, Zhengguo Rui, Tianyu Zhao, Xiyun Zhang
Summary: This study investigates the effect of intumescent flame retardant and montmorillonite on the fire resistance of thermoplastic polyurethane. It is found that with a certain ratio of fillers, the LOI of TPU can be significantly increased and a better fire rating can be achieved.
POLYMER COMPOSITES
(2022)
Article
Automation & Control Systems
Yu Zhuang, Yanling Guo, Jian Li, Kaiyi Jiang, Hui Zhang, Deyu Meng
Summary: The tensile strength of selective laser sintering thermoplastic polyurethane/carbon nanotube composites was improved by optimizing the process parameters, which also addressed issues such as delamination and smoke caused by material decomposition. The optimal combination of laser power, scan spacing, and layer thickness was determined, leading to a 4.42% increase in tensile strength of the parts.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Polymer Science
Cheng Zhang, Wei Wu, Huanbo Hu, Zhengguo Rui, Junjian Ye, Hui Shen
Summary: This study aims to improve the tensile strength and thermal stability of selective laser sintered thermoplastic polyurethane elastomer/spherical alumina/graphene oxide/silicon nitride whisker (TPU/Al2O3/GO/Si(3)N(4)ws) composites by investigating the synergistic enhancement of fillers with different dimensions. The results show that the synergistic effect of multidimensional fillers leads to a significant improvement in the mechanical properties of TPU composites. Furthermore, the effect of fillers on the selective laser sintering process, thermal stability, and crystallization behaviors of the composites was also studied.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Jianshuo Li, Wei Wu, Xiyun Zhang, Tianyu Zhao, Zhengyi Wang, Shuo Li
Summary: In this study, the flame retardancy of thermoplastic polyurethane (TPU) was enhanced using layered double hydroxides (LDHs) and intumescent flame retardant (IFR) through selective laser sintering (SLS) technology. The results showed that adding LDHs to the TPU composite increased the limiting oxygen index and decreased the heat release rate, smoke production rate, and carbonic oxides production. Thermogravimetric analysis indicated a favorable synergism effect between LDHs and IFR, leading to good thermal stability of the TPU/23IFR/2LDHs composite.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Materials Science, Ceramics
Giovanni Urruth, Delphine Maury, Christophe Voisin, Vincent Baylac, David Grossin
Summary: This study aimed to process 8 mol.% yttrium stabilized zirconia using powder bed selective laser processing, and successfully identified an optimized set of parameters for manufacturing high-density parts. Challenges and technical aspects observed during the study were also discussed.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Mohammad Mojaddarasil, Ali Kiani, Mohammad Reza Tavakoli, Mohsen Badrossamay
Summary: This study evaluated the effects of encapsulation gas parameters on powder bed temperature distribution in the SLS process. The results showed that helium and argon had the most and least uniform temperature distributions, respectively. Increasing gas pressure improved the uniformity of temperature distribution. Furthermore, increasing gas heat capacity up to a certain value increased the uniformity, while exceeding that value decreased it.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Chemistry, Physical
Yutao Shi, Bo Wang, Shihang Ye, Yiru Zhang, Bingzhong Wang, Yuezhan Feng, Wenjuan Han, Chuntai Liu, Changyu Shen
Summary: A magnetic, superelastic, and superhydrophobic porous thermoplastic polyurethane monolith was successfully fabricated, demonstrating excellent performance in adsorbing oils/organic solvents, chemical/thermal stability, and high recyclability. This monolith also displayed high oil/water separation efficiency and has great potential for oily wastewater treatment applications.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Xiangwu Xiao, Yufeng Jin, Yuanqiang Tan, Wei Gao, Shengqiang Jiang, Sisi Liu, Meiliang Chen
Summary: This study investigates the importance of powder spreading in SLS and proposes a method to optimize the quality of powder spreading through the use of DEM and RSM. By establishing a regression model and utilizing an improved multi-objective optimization algorithm, the powder laying quality in the SLS process was enhanced.
Article
Engineering, Manufacturing
Alexis Maurel, Matti Haukka, Eric MacDonald, Lauri Kivijarvi, Elmeri Lahtinen, Hyeonseok Kim, Michel Armand, Aurelie Cayla, Arash Jamali, Sylvie Grugeon, Loic Dupont, Stephane Panier
Summary: This paper explores the ability to 3D print lithium-ion batteries using specific materials and processes, discussing the advantages and drawbacks of two different additive manufacturing technologies and proposing strategies for optimizing electrochemical performance. The study shows that complex three-dimensional lithium-ion battery designs exhibit enhanced electrochemical suitability at high current densities compared to traditional two-dimensional designs.
ADDITIVE MANUFACTURING
(2021)
Article
Engineering, Manufacturing
Md Mahfuzur Rahman, Kazi Arman Ahmed, Mehrab Karim, Jakir Hassan, Rakesh Roy, Bayazid Bustami, S. M. Nur Alam, Hammad Younes
Summary: This research aims to determine the optimal parameters for achieving high-quality SLS parts using TPU flexa black powder. The study focuses on layer thickness and laser power ratio, evaluating their impact on density, hardness, modulus of elasticity, and printing time. Response surface methodology is used to analyze the relationships, and an optimal combination of parameters is identified. Experimental validation confirms the adequacy of the model, and the study provides valuable insights for setting process parameters in similar SLS operations.
JOURNAL OF MANUFACTURING AND MATERIALS PROCESSING
(2023)
Article
Polymer Science
Samuel Schlicht, Sandra Greiner, Dietmar Drummer
Summary: This research proposes a new method for extending the isothermal processing temperature range in Powder Bed Fusion of Polymers. By applying quasi-simultaneous laser-based exposure of fractal scan paths, the method allows for the processing of a wider range of polymers. The temporal and spatial discretization of melting and crystallization enables compensation for crystallization shrinkage, reducing curling and warping. The manufactured parts have a dense morphology and a nano-scale semi-crystalline structure. This method not only reduces energy consumption and material aging but also provides a foundation for processing novel thermo-sensitive material systems.
Article
Polymer Science
Wei Shian Tey, Chao Cai, Kun Zhou
Summary: Multi Jet Fusion (MJF) is a promising polymeric powder bed fusion (PBF) additive manufacturing technique that can efficiently fabricate functional and complex polymeric parts. This study systematically characterized the physicochemical properties of MJF-certified polyamide 11 (PA11) and thermoplastic polyurethane (TPU) powders, and evaluated the mechanical performance and print quality of the printed specimens. Despite irregular morphology and broad particle size distribution, both PA11 and TPU powders exhibited good printability.
Article
Engineering, Environmental
Nycolle G. S. Silva, Lucas I. C. O. Cortat, Ericson J. O. Teixeira, Leonardo Baptista, Diego Orlando, Daniella Regina Mulinari
Summary: Waste tire rubber (WTR) is generated extensively due to the growth of mobility needs and is constantly discharged into the environment with limited reuse options. This study explores the usage of WTR particles (5-20% by weight) in castor oil-based polyurethane foams, aiming to reduce fossil resource usage and contribute to a circular economy. The effects of photo-oxidation and hydrolysis on the foams' performance were analyzed by determining their morphological, thermal, chemical, and mechanical properties before and after exposure to open air. The results show that the addition of WTR increases foam density and reduces cell size, enhancing compressive behavior. After weathering, the degradation may lead to increased crosslinking density and structural changes, such as yellowing and voids. The rubber also slightly affects thermal stability and shows potential for improved fire retardancy.
Article
Engineering, Manufacturing
Francois Rouze l'Alzit, Tiphaine Bazin, Thierry Cardinal, U. -Chan Chung, Sylvain Catros, Caroline Bertrand, Manuel Gaudon, Gerard Vignoles
Summary: The study focused on the crucial parameters in SLS applied to copper-doped hydroxyapatite bioceramic, examining the impact of incorporating copper ions through thermal treatment to enhance material properties and measuring the maximum temperature produced on the film surface by laser irradiation.
ADDITIVE MANUFACTURING
(2021)