Article
Engineering, Chemical
Naoki Kakegawa, Shion Nanaumi, Zhenxing Zhou, Weiwei Zhou, Naoyuki Nomura
Summary: This study intentionally adjusted the surface conditions of Ti-6Al-4 V alloy powders through heat treatments and investigated their effects on flowability. The results showed that the increase in surface oxides enhanced the flowability of the powders, while the decomposition of the oxide layer decreased flowability, thereby affecting the quality of the powder beds. The study demonstrated that metallic interactions are more important for the cohesive strength of the powders.
Article
Engineering, Mechanical
Jianfeng Zhao, Xinlei Pan, Jian Li, Zhiyong Huang, Qianhua Kan, Guozheng Kang, Liucheng Zhou, Xu Zhang
Summary: Systematic characterization of microstructure, mechanical testing and constitutive modeling were conducted to investigate the effects of laser shock peening (LSP) treatment on the tensile properties of Ti-6Al-4 V alloy. The study revealed that LSP treatment resulted in grain refinement and introduction of compressive residual stress, leading to changes in the material's elastic-plastic behavior. The established deformation mechanism-based model showed that surface grain refinement enhanced initial yielding and strain hardening, while residual stress had a weakening effect on initial yielding but little influence on strain hardening behavior.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Manufacturing
Irfan Ullah, Song Zhang, Qing Zhang, Renwei Wang
Summary: This study investigates the numerical methodology for serrated chip formation during high-speed milling of Ti-6Al-4V alloy and validates the model through experimental results. The impact of friction coefficient on shear stress, as well as the microstructural changes and phase transformation during chip formation, are highlighted and discussed. The findings are beneficial for optimizing process parameters and maintaining desirable machined surface integrity.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Chemistry, Physical
Mingyuan Zhang, Taotao Cai, Weiliang Lu, Shili Zheng, Ying Zhang, Yi Zhang
Summary: A novel sintering-deoxygenation process was proposed to fabricate Ti-6Al-4V alloy powder with low-cost and low-grade materials. The sintering shrinkage was affected by temperature, holding time, and raw materials, while the oxygen content in precursors influenced the phase composition and diffraction peaks. The hydrogen-assisted Mg deoxygenation method effectively reduced the oxygen level in the final Ti-6Al-4V powders, meeting the requirements of GB/T 34486-2017.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Maryam Kahvazi Zadeh, Mahdi Yeganeh, Mohammadreza Tavakoli Shoushtari, Hossein Ramezanalizadeh, Farzad Seidi
Summary: This study investigates the microstructure and electrochemical behavior of Ti-6Al-4 V alloy manufactured by laser powder bed fusion (LPBF) and electron beam melting (EBM) in Ringer's solution. It is found that the LPBF-manufactured alloy has better corrosion resistance due to the formation of local galvanic cells in the EBM-manufactured alloy. MTT assay shows that the manufactured samples have good biocompatibility. The LPBF-manufactured alloy is more suitable for implant applications.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
R. X. Zhao, J. Wang, T. W. Cao, T. Hu, S. S. Shuai, S. Z. Xu, C. Y. Chen, Z. M. Ren, M. Qian
Summary: This study demonstrates the use of high magnetic field heat treatment to modify the microstructure of a Ti-6Al-4V alloy fabricated by laser-powder bed fusion, resulting in improved mechanical properties. The treatment increased the sub-grain boundaries in the alpha-phase and accelerated the coarsening and globularization of the alpha-phase, leading to enhanced tensile ductility. Furthermore, the treatment induced better alignment of the alpha-variants with the < 11-20 >alpha direction, facilitating the activation of prismatic and basal slips.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Mechanical
Wei Fang, Junkai Chen, Fei Cai, Qi Zhou, Mingxi Li, Shihong Zhang
Summary: AlTiBN coatings with varied B contents were produced to investigate their microstructures, thermal stability, and high-speed dry cutting performance. The addition of B promoted structural refinement, increased adhesive strength, ratios of H/E * and H3/E * 2, thereby reducing coefficients of friction and wear rates. Compared to AlTiN coating, the high-speed dry turning tests demonstrate significant improvement in tool life for AlTiBN coating, with the B10 coating showcasing the longest cutting length of approximately 780 m due to its high toughness, superior thermal stability, increased ratios of H/ E * (0.082) and H3/E * 2 (0.207 GPa) at 1000 degrees C, and reduced crater wear and cutting force.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Automation & Control Systems
Marina O. Gushchina, Yulia O. Kuzminova, Oleg N. Dubinin, Stanislav A. Evlashin, Arthur M. Vildanov, Olga G. Klimova-Korsmik, Gleb A. Turichin
Summary: In this study, a multilayer titanium composite was produced using laser direct energy deposition, showing improved mechanical properties and impact toughness. This development has practical significance for the advancement of new materials.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Manufacturing
Rahul Davis, Abhishek Singh, Kishore Debnath, Roberta Maia Sabino, Ketul Popat, Paulo Soares, Anup Kumar Keshri, Bhaskar Borgohain
Summary: In the field of high-precision miniaturized medical implants, the biomedical Ti-6Al-4V alloy meets the requirements for longevity, biocompatibility, and sterilizability. By adding different concentrations of bioactive zinc powder particles, the researchers were able to reduce machining time and dimensional deviation in micro-electric discharge machining. The combination of a copper micro-tool electrode and a 6 g/l zinc powder concentration showed the best results, with lower machining time, dimensional deviation, and recast layer thickness. The modified alloy surface also showed potential for dental applications and potential antiviral activity against COVID-19.
JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Civil
Hamza E. L. Etri, Anil Kumar Singla, Mehmet Tayyip Ozdemir, Mehmet Erdi Korkmaz, Recep Demirsoz, Munish Kumar Gupta, J. B. Krolczyk, Nimel Sworna Ross
Summary: This study focuses on the tribological performance of Ti-6Al-4 V alloy in contact with WC carbide abrasive balls under nanodoped cooling and lubrication conditions. The results showed that the hybrid nanoparticle situation experienced the least amount of volume loss compared to other lubrication conditions.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
H. Wang, Q. Chao, H. S. Chen, Z. B. Chen, S. Primig, W. Xu, S. P. Ringer, X. Z. Liao
Summary: By studying the microstructural evolution of Ti-6Al-4V alloy fabricated by laser powder-bed fusion (L-PBF), it has been discovered that manipulating the thermal history can induce an alpha' -> alpha+beta phase transformation, resulting in a fine lamellar alpha+beta structure with excellent strength and ductility.
Article
Chemistry, Physical
Kun Zhao, Xiaorui Huang, Yaowu Wang, Yuehong Zhang, Kejia Liu
Summary: A novel aluminothermic reduction combined with deoxidation process was developed to prepare low-oxygen Ti-6Al-4V alloy powder. The oxygen content in the crude Ti-6Al-4V alloy powder was detected and analyzed, and the deoxygenation process was carried out using calcium as a deoxidizer. The final Ti-6Al-4V powder met the required composition standards.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Manufacturing
Irfan Ullah, Song Zhang, Saad Waqar
Summary: Residual stress significantly affects the performance and stability of machined parts. This study presents a numerical and experimental approach to predict and analyze the residual stress in milled parts made of Ti-6Al-4V alloy, considering the influence of white layer formation.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Materials Science, Multidisciplinary
Alireza Dareh Baghi, Shahrooz Nafisi, Heike Ebendorff-Heidepriem, Reza Ghomashchi
Summary: A detailed study comparing the microstructural differences between Ti-6Al-4V parts fabricated via conventional powder metallurgy and laser powder bed fusion routes revealed that L-PBF parts have a higher microhardness with a single phase of martensitic alpha '. On the other hand, parts sintered via powder metallurgy showed two phases with lower microhardness. The rapid cooling of the beta phase had no effect on the hardening of the bulk martensitic hcp alpha ' in L-PBF parts.
Article
Automation & Control Systems
Moran Xu, Changping Li, Rendi Kurniawan, Chen Jielin, Ye In Kwak, Saood Ali, Min Ki Choo, Tae Jo Ko
Summary: Ultrasonic and electrical discharge-assisted milling (US-EDAM) is a new machining method designed for machining difficult-to-cut materials. It combines electrical discharge machining (EDM) and conventional milling with ultrasonic vibration to soften the material's surface, reduce cutting force, and accurately remove the softened surface. Experimental results show that US-EDAM achieves better surface integrity compared to other machining methods.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Seungkyun Yim, Kenta Aoyagi, Keiji Yanagihara, Huakang Bian, Akihiko Chiba
Summary: In this study, mechanical stimulation was used to suppress smoke in gas-atomized powders. The deformation mechanism of the powders was discussed, and the variation in electrical properties was investigated. The results showed that mechanical stimulation reduced smoke and improved the flowability of the powders.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Yanfang Wang, Xin Lin, Yufan Zhao, Zihong Wang, Xiaobin Yu, Xuehao Gao, Weidong Huang
Summary: Zr modification improves the hot-cracking resistance and elevated-temperature mechanical properties of aluminum alloys. The study found that the hot-cracking susceptibility increased with the scanning speed. Zr modification led to the precipitation of primary L1(2)-Al3Zr precipitates and the formation of a heterogeneous grain structure. The yield strength of the Zr-modified alloy showed significant improvement at elevated temperatures, surpassing traditional alloys with good heat resistance.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Cheng Yang, Huakang Bian, Fan Zhang, Yujie Cui, Yuchao Lei, Yuichiro Hayasaka, Kenta Aoyagi, Kenta Yamanaka, Akihiko Chiba
Summary: The study investigates a partially disordered MCIM, C14 Laves phase, in a dual-phase CrHfNbTaTi refractory HEA, and determines its chemical formula and site preferences based on the observation of spatial atomic arrangement. It is found that the formation enthalpy of the C14 Laves phase in MCIM significantly increases due to local substitutions, resulting in higher energy and lower stability. Therefore, by manipulating the local substitution degree of the potential MCIM, the high-entropy solid solution can surpass MCIM even at intermediate temperatures. This study provides insights into the high-entropy effect and offers a valuable phase-regulation strategy for future HEA design.
MATERIALS & DESIGN
(2023)
Article
Nanoscience & Nanotechnology
Yunwei Gui, Kenta Aoyagi, Akihiko Chiba
Summary: In this study, different types of powders were compared using support vector machine techniques to determine the most suitable powder for Ti-6Al-4V alloys fabricated via powder bed fusion using electron beams. The results showed that powders fabricated via plasma rotating electrode process had the best properties and were most suitable for printing. A processing map was constructed using support vector machine to predict a wide range of printing parameters for obtaining macro-defect-free samples. The macro-defect-free samples exhibited good elongation and excellent mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Yanfang Wang, Xin Lin, Yufan Zhao, Qijuan Dong, Shuoqing Shi, Xuehao Gao, Haiou Yang, Weidong Huang
Summary: The effect of direct aging treatment on the microstructure and strengthening mechanisms of Zr-modified Al-Cu-Mg alloys fabricated by SLM was analyzed in this study. After direct aging treatment, the fine alpha-Al grains were maintained and the S'-Al2CuMg precipitates dissolved. The precipitation of secondary Al3Zr-L12 led to a larger increase in precipitation strengthening compared to grain boundary strengthening.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Chemical
Yufan Zhao, Kenta Aoyagi, Yujie Cui, Kenta Yamanaka, Akihiko Chiba
Summary: The quality of powder bed fusion (PBF) products is influenced by processing conditions and materials, with powder characteristics playing a significant role in determining packing features and affecting heat transfer processes. This study focused on the influence of powder characteristics on upper surface quality and solidification grain structure in PBF with electron beam (PBF-EB) using two types of CoCrMo alloy powders with different thermal conductivities. The results showed that powder with high thermal conductivity alleviated overheating under high-power conditions and improved fusion sufficiency under low-power conditions.
Article
Engineering, Chemical
Haejin Lee, Yeonghwan Song, Seungkyun Yim, Kenta Aoyagi, Akihiko Chiba, Byoungsoo Lee
Summary: The generation mechanism of the side surface in powder bed fusion electron beam melting process was investigated using modified Rene ' 80 alloy. It was found that the dimensional inaccuracy of the as-built part mainly comes from part diameter variation. The side surface roughness of the as-built part can be improved by optimizing the linear energy to restrict the formation of wavy bulges.
Article
Nanoscience & Nanotechnology
Jiaxiang Li, Kenta Yamanaka, Yuichiro Hayasaka, Akihiko Chiba
Summary: A Co0.95Cr0.8Fe0.25Ni1.8Mo0.475 high-entropy alloy underwent heavy cold rolling and subsequent aging at 773 K, resulting in Suzuki hardening. Enrichment of Co atoms at stacking faults (SFs) was observed, which pinned down partial dislocations and enhanced the deformation resistance. Additionally, enrichment of Co and Mo atoms at SFs was observed in a low dislocated, strain-aged specimen, leading to differences in segregation. The calculated local stacking fault energy (SFE) with the segregation of Co and Mo atoms was -30.6 mJ/m2 at the aging temperature, indirectly leading to the formation of wide SFs.
SCRIPTA MATERIALIA
(2023)
Article
Engineering, Manufacturing
Seungkyun Yim, Huakang Bian, Kenta Aoyagi, Kenta Yamanaka, Akihiko Chiba
Summary: We investigated the influence of particle morphology on flowability and spreading behavior using a discrete element method (DEM) simulation. The addition of non-spherical particles decreased flowability and resulted in a transition from rolling flow to cascading flow under rotation. Adding elongated particles decreased the quality of the powder bed due to force-arch formation and strong particle interlocking. Spherical particles with low spreading velocity are desirable for improving the quality of the powder bed in the PBF-AM process.
ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Yusaku Hasebe, Takehito Hagisawa, Cheng Yang, Kenta Aoyagi, Kenta Yamanaka, Akihiko Chiba
Summary: Hot compression tests were conducted on a cast Ni-based superalloy IN-100 to investigate its hot deformation behavior. A processing map of the hot deformation was constructed based on the flow stress-true strain curves and microstructure observations. The results show that the flow stress and crystal orientation of the alloy vary with different temperatures and strain rates, and various types of recrystallization phenomena were observed.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Yufan Zhao, Kenta Aoyagi, Kenta Yamanaka, Akihiko Chiba
Summary: This study investigated the effect of powder layer thickness on the electron beam powder bed fusion process. The results showed that a relatively larger powder layer thickness can expand the processing window but also decrease the melting efficiency and result in surface height differences. Numerical simulation further confirmed the dependency of the layer thickness effect on the processing conditions.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Kenta Yamanaka, Manami Mori, Kazuo Yoshida, Phacharaphon Tunthawiroon, Akihiko Chiba
Summary: In this study, the corrosion behavior of Co-28Cr-6Mo-1.5Si (wt%) alloy in commercial Al-Si alloy (ADC12) melt at 700? for 10 h was investigated. The results showed that liquid metal corrosion was more severe in the Al-Si melt than in pure Al, indicating increased reactivity due to Si addition. The interfacial analysis revealed a direct reaction between the alloy substrate and molten Al in both cases, and the formation of oxides such as Al2O3 and SiO2 did not contribute to corrosion resistance.
HIGH TEMPERATURE MATERIALS AND PROCESSES
(2023)
Article
Materials Science, Multidisciplinary
Weicheng Heng, Kenta Aoyagi, Akihiko Chiba
Summary: A new additive manufacturing method using metal paste was developed, and polymer addition was found to improve the homogeneity of the paste, suppress defect generation, and prevent the formation of powder clots. The polymer also resulted in a smoother surface and finer grains in the fabricated samples.
Article
Engineering, Chemical
Ri Zhang, Shasha Zhang, Mengyan Ding
Summary: A thin liquid film method is proposed to evaluate sand erosion in annular flow. This method considers the direct interaction between the liquid film and gas core, as well as the entrainment and deposition of droplets. The erosion rate is calculated by considering the effects of liquid entrainment and particle velocity decay. The method is fully verified by comparing with experimental data.
Article
Engineering, Chemical
Yu Suo, Xianheng Su, Wenyuan He, Xiaofei Fu, Zhejun Pan
Summary: This research investigates the mechanical properties of sandstone-shale composite through orthogonal experimental method and discrete element simulation. The results show that different lithologies and thickness ratios can affect the strength and fracture mode of the composite rock samples.
Article
Engineering, Chemical
Maurizio Troiano, Andrea El Hassanin, Roberto Solimene, Alessia Teresa Silvestri, Fabrizio Scala, Antonino Squillace, Piero Salatino
Summary: This study investigates the potential of Fluidized Bed Finishing (FBF) for square flat AlSi10Mg specimens manufactured via Laser-Powder Bed Fusion (L-PBF) additive manufacturing technology. The results show that good finishing can be achieved using rotation-assisted tests, with a maximum reduction of surface roughness by 67%. Steel particles are found to be the most effective bed material.
Review
Engineering, Chemical
Ningbo Song, Wanzhong Yin, Jin Yao
Summary: Seawater's dissolved salts and minerals have various effects on the flotation process, including influencing the characteristics and behavior of flotation factors, as well as affecting the surface of sulfide minerals. In most cases, seawater has adverse effects on the flotation of sulfide minerals, but these effects can be mitigated by adjusting the reagents.
Article
Engineering, Chemical
Kaiqiao Wu, Shuxian Jiang, Victor Francia, Marc-Olivier Coppens
Summary: In rectangular and cylindrical annular fluidized beds, pulsating gas flow can create regular bubble patterns, overcoming challenges seen in conventional units. This study provides new opportunities for modularization of fluidized bed operations.
Article
Engineering, Chemical
Shuo Li, Huili Zhang, Jan Baeyens, Miao Yang, Zehao Li, Yimin Deng
Summary: The paper assesses the behavior of cohesive Geldart C-type particles when fluidized by air with the aid of vibration. It determines that mechanical vibration is a simple and effective method to improve the fluidity of cohesive particles during fluidization.
Article
Engineering, Chemical
Zhenfei Feng, Qingyuan Zhang, Shanpan Liang, Zhenzhou Li, Fangwen Guo, Jinxin Zhang, Ding Yuan
Summary: A new micro/mini-channel heat sink (MCHS) with a combined structure of longitudinal and transverse vortex generators is designed, using Al2O3 nanofluid as the working medium. The study explores the effects of transverse vortex generator shape and longitudinal vortex generator angle on the hydraulic and thermal characteristics, comprehensive performance, entropy generation, and exergy efficiency. The results show that the triangular transverse vortex generator improves the comprehensive performance and exergy efficiency. Combined with the longitudinal vortex generator, the MCHS achieves the best comprehensive performance, entropy generation, and exergy efficiency when the Reynolds number is 742.
Article
Engineering, Chemical
Kostas Giannis, Christoph Thon, Guoqing Yang, Arno Kwade, Carsten Schilde
Summary: This study presents a 3D convolutional neural network (3D-CNN) methodology for generating realistic 3D models of particles. The method trains on 2D projections of particle images to predict their 3D shapes, and evaluates the accuracy of the predictions using Fourier shape descriptors (FSDs). This methodology has wide applications in particle shape analysis.
Article
Engineering, Chemical
Zheng-qing Zhou, Lu-jia Chai, Yu-long Zhang, Ya-bin Wang, Ze-chen Du, Tian-yi Wang, Yu-zhe Liu
Summary: The dynamic oxidation and shell-breaking processes of aluminum nanoparticles (ANPs) during heating were studied using in situ transmission electron microscopy. The results revealed that the changes in shell thickness can be divided into three stages, and the active aluminum content of ANP decreased before shell-breaking.
Article
Engineering, Chemical
Fulei Chen, Huaqing Ma, Zihan Liu, Lianyong Zhou, Yongzhi Zhao
Summary: A particle breakage model based on the particle replacement scheme, using the polyhedral model to describe particles, is proposed in this work to accurately describe the breakage of a large number of particles. Additionally, a fast-cutting algorithm is proposed to reproduce the size distribution of progeny particles determined by the breakage model. The validation and simulation results show satisfactory accuracy, efficiency, and stability of the algorithm.
Review
Engineering, Chemical
Matteo Errigo, Christopher Windows-Yule, Massimiliano Materazzi, Dominik Werner, Paola Lettieri
Summary: Gas-solid fluidized-bed systems have advantages in terms of chemical reaction efficiency and temperature control, making them widely used in industrial applications. However, the design, scale-up, and optimization of these complex units are limited by the lack of deep physical understanding. Non-invasive and non-intrusive diagnostic techniques provide a way for researchers to study these systems without affecting the flow field or directly contacting the medium under study.
Article
Engineering, Chemical
Saeed Fateh, Mohammad Behshad Shafii, Mohammad Najafi, Cyrus Aghanajafi
Summary: Applying a magnetic field to ferrofluids alters their flow characteristics and enhances heat transfer. Through visualization and quantitative investigation, it is found that the magnetic field influences the flow patterns and velocity profiles, improving fluid mixing and vorticity magnitude.
Article
Engineering, Chemical
Lei Gao, Bingbing Wei, Xiaochuan Hu, Zaifeng Yao, Yiwen Fang, Xuejian Gao
Summary: In this study, a numerical model of sand triaxial test was established using discrete element software PFC3D, and an indoor triaxial test was conducted to calibrate the numerical model. The influence of microscopic parameters on the macroscopic mechanical response of sand was analyzed. The results showed that the friction coefficient had the greatest impact on the peak strength and residual strength of the sand's stress-strain curve, and it was positively correlated. The normal tangential stiffness ratio was negatively correlated, while the porosity and boundary flexibility stiffness had minimal influence on it.
Article
Engineering, Chemical
Xuan Liu, Jie Gong, Kai Jiang, Xiaojuan Lai, Yu Tian, Kang Zhang
Summary: This study aimed to improve the performance of lignite coal water slurries (CWSs) by synthesizing a series of three-arm amphiphilic block copolymers. By controlling the relative molecular weight, hydrophilic/hydrophobic ratio, and ionic group content, the apparent viscosity of CWSs was significantly reduced and the static stability was improved. Thermogravimetric testing and XPS analysis were conducted to reveal the mechanism behind the improved performance.
Article
Engineering, Chemical
Lanka Dinushke Weerasiri, Daniel Fabijanic, Subrat Das
Summary: Fluidization at low pressure offers significant benefits for the fine chemical industry. This study investigates the behavior of bubbles and bed expansion under low pressure conditions. It is found that lower pressure leads to larger bubbles, increased bubble quantity, and higher aspect ratio. The predictability is affected by the inhomogeneous fluidization, but low pressure fluidization can generate similar bubble sizes with lower fluidizing mass compared to atmospheric pressure.