Powder Technology最新文献

{"title":"Effect of reuse on Cu-Cr-Nb powder and bulks produced by laser powder bed fusion","authors":"Zixiang Dai ,&nbsp;Xuyan Chen ,&nbsp;Yingquan Liu ,&nbsp;Jie Wang ,&nbsp;Junyong Lu ,&nbsp;Jiabin Liu","doi":"10.1016/j.powtec.2025.120930","DOIUrl":"10.1016/j.powtec.2025.120930","url":null,"abstract":"<div><div>Cu-Cr-Nb, a high-strength, high-conductivity copper alloy for high-temperature applications, has gained importance in aerospace components used in extreme thermal environments. Laser additive manufacturing has become the predominant method for preparing Cu-Cr-Nb alloy components. In the typical additive manufacturing process, not all metal powder is utilized in the product formation, enabling reuse to reduce material costs effectively. This study investigated the recyclability of Cu-Cr-Nb powder in laser powder bed fusion and its impact on both the powder and the printed bulks. Compared to virgin powder, recycled powder exhibited extensive spatters, agglomerations, and a broadened particle size distribution, while its overall composition remained nearly unchanged. The increased oxygen content changed the chemical properties of the powder surface and resulted in a decrease in laser reflectivity. Findings indicated an expansion in the range of powder particle size distribution and an increase in oxygen content from 0.053 % to 0.143 % after six cycles, along with a 15.0 % decrease in reflectance. These alterations corresponded with a reduction in the melt pool's width-to-depth ratio, increased porosity, and lowered density, significantly affecting the relative ductility, whereas hardness and tensile strength remained largely unaffected. This research offers vital insights into employing recycled powder for copper alloys and also underscores the necessity for different recycling strategies across various alloy systems.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120930"},"PeriodicalIF":4.5,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling the working pressure of a cement vertical roller mill using SHAP-XGBoost: A “conscious lab of grinding principle” approach","authors":"Rasoul Fatahi,&nbsp;Hadi Abdollahi,&nbsp;Mohammad Noaparast,&nbsp;Mehdi Hadizadeh","doi":"10.1016/j.powtec.2025.120923","DOIUrl":"10.1016/j.powtec.2025.120923","url":null,"abstract":"<div><div>The optimization and control of Vertical Roller Mill (VRM) circuits are critical for industrial processes, yet limited modeling has slowed progress in operator training, error minimization, and laboratory cost savings. To overcome limitations, the innovative “Conscious Lab” (CL) was introduced, utilizing industrial datasets and Explainable Artificial Intelligence (XAI) techniques. For the first time, CL combines Shapley Additive Explanations (SHAP) with machine learning models, such as XGBoost and Random Forest, to optimize VRM operations. Differential pressure and feed rate were identified as the most influential parameters of working pressure, essential for maintaining stable operations. Robust linear correlations (coefficients: 0.94 for feed rate, 0.84 for main drive power, and 0.83 for differential pressure) and nonlinear marginal plots (0.95, 0.81, and 0.81) highlighted how increases in these parameters significantly raise working pressure. The XGBoost model achieved remarkable prediction accuracy (0.99 for training and 0.98 for testing/validation) with a low RMSE (0.01), confirmed by 5-fold cross-validation. SHAP analysis further verified the relationship between working pressure and key parameters, aligning with VRM grinding principles. The CL approach introduces a data-driven control system enabling real-time decision-making, process optimization, and improved production efficiency, showcasing the transformative potential of advanced data analytics for industrial applications.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120923"},"PeriodicalIF":4.5,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative study on compressive strength of coated particles prepared in a Wurster fluidized bed using different coating materials","authors":"Jinnan Guo,&nbsp;Daoyin Liu,&nbsp;Zhiheng Fan,&nbsp;Jiliang Ma,&nbsp;Cai Liang,&nbsp;Xiaoping Chen","doi":"10.1016/j.powtec.2025.120928","DOIUrl":"10.1016/j.powtec.2025.120928","url":null,"abstract":"<div><div>Wurster fluidized beds are widely used for coating particles, whose mechanical stability and functional reliability strongly depend on the particle compressive strength. In this study, the compressive strength of coated particles using different coating materials (suspension, colloidal dispersion, and solution) under various drying conditions (fluidizing gas temperature and liquid spray rate) and atomization pressures is evaluated. Generally, the compressive strength decreases in following order: particles coated with suspension, colloidal dispersion, and solution. For suspension, the compressive strength shows minimal sensitivity to drying rate or atomization pressure. For colloidal dispersion, the variation of compressive strength with the drying rates and atomization pressures is not monotonic. For solution, lower drying rates or atomization pressures result in slightly loose coating shells, leading to decreased compressive strength. Finally, influencing mechanisms on compressive strength are summarized, which can be helpful to improve coated particle quality in Wurster fluidized beds.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120928"},"PeriodicalIF":4.5,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of surface hydrophobicity on the bubble-substrate collisional interaction process and interaction force","authors":"Bolong Zhang ,&nbsp;Ying Wang ,&nbsp;Ruifeng Chen ,&nbsp;Danlong Li ,&nbsp;Jincai Ran ,&nbsp;Hainan Wang ,&nbsp;Haijun Zhang","doi":"10.1016/j.powtec.2025.120925","DOIUrl":"10.1016/j.powtec.2025.120925","url":null,"abstract":"<div><div>Investigating the collisional interaction process and interaction forces between bubbles and substrates can enhance the comprehension of the bubble-particle collision and adhesion process in flotation. In this study, the collisional interaction processes between bubbles and various hydrophobic glass surfaces were studied, and the interaction forces were directly measured by a high-sensitive microbalance system. The results demonstrated that surface hydrophobicity has a negligible effect on the collision process, evidenced by the same velocity variation and the same number of collisions on different hydrophobic surfaces. In terms of adhesion behavior, it was observed that the adhesion area of bubbles increased substantially and the induction time decreased significantly with the increase in surface hydrophobicity, indicating that bubbles are more likely to adhere to hydrophobic surfaces. This phenomenon is consistent with the measurement of interaction forces, where higher adhesion force and pull-off force can be measured on hydrophobic surfaces. Meanwhile, with increasing surface hydrophobicity, the “jump-in” adhesion was more significant, and detachment was more difficult. To clarify the specific force variation during the interaction, the interaction forces were calculated theoretically at critical positions and compared to the measured value. It was found that they are consistent, and both capillary force and Laplace force increased with increasing surface hydrophobicity. These findings demonstrate that bubbles experience stronger attraction and adhere more strongly to hydrophobic surfaces.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120925"},"PeriodicalIF":4.5,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Observations on the steady-state fluidised bed porosity at low Reynolds numbers","authors":"Yingyi Zhang ,&nbsp;Adnan Sufian ,&nbsp;Alexander Scheuermann","doi":"10.1016/j.powtec.2025.120864","DOIUrl":"10.1016/j.powtec.2025.120864","url":null,"abstract":"<div><div>The porosity of fluidised beds subjected to a range of inlet flow velocity at low Reynolds numbers was investigated experimentally and numerically. A permeameter was employed for the fluidisation experiments with packings of spherical particles subjected to upward flow, and the fluidisation process was acquired with a charge-coupled device camera. Internal cross-sections of the sphere packings were observed, which was allowed by matching the refractive indices between the liquid and solid phase to attain a transparent particle-fluid combination. The fluidised bed porosity at the steady state was estimated from the thickness of the expanded assemblies from acquired images. Numerical simulations were conducted using coupled Computational Fluid Dynamics and Discrete Element Method with equivalent hydraulic and geometric conditions. The simulation configuration was rigorously tested to optimise numerical stability and capture detailed fluidisation behaviours, and different drag models were used to assess the potential differences. The temporally- and spatially-averaged fluidised bed porosity was obtained from the numerical output, and was compared with the experimental results, as well as analytical solutions. Good agreement was observed in the variation in the fluidised bed porosity with increasing inlet flow velocity at the steady-state condition, which provides confidence in the simulation results of particulate fluidisation, which is associated with internal erosion.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120864"},"PeriodicalIF":4.5,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A fast and accurate adaptive dynamic relaxation technique for discrete element analysis of granular media","authors":"Subham Mukherjee,&nbsp;Arghya Deb","doi":"10.1016/j.powtec.2025.120909","DOIUrl":"10.1016/j.powtec.2025.120909","url":null,"abstract":"<div><div>The paper proposes an improved dynamic relaxation algorithm for the discrete element analysis of cohesive granular materials such as concrete. The history of the fictitious dynamics induced in the particulate system during dynamic relaxation is examined. It is seen that during a typical load increment, there are three distinct phases. While in the first phase the dynamic response is largely homogenous, it becomes progressively heterogeneous in subsequent phases. A uniform damping coefficient is used in the first phase to optimize performance and reduce computational cost. However, in subsequent phases, heuristics based on the kinetic energy are used to tailor the damping coefficient for groups of particles and, eventually, for individual particles. This approach is seen to speed up attainment of the steady state, with the most significant improvements occurring for load increments subsequent to the onset of dissipation and damage. The modified algorithm is implemented in a discrete element code, and its performance is tested by simulating hardened concrete. In all cases, the quasi-static solution is recovered at vastly reduced computational times. The algorithm also scales well with discretization, with gains in computational time seen to increase for assemblies with finer particles.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120909"},"PeriodicalIF":4.5,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sorting particles in the air using direct and inverse Chladni patterns of a vibrating plate","authors":"Valentin Bourrud ,&nbsp;Eloi Perez Compte ,&nbsp;Maxime Lanoy ,&nbsp;Olivier Robin","doi":"10.1016/j.powtec.2025.120867","DOIUrl":"10.1016/j.powtec.2025.120867","url":null,"abstract":"<div><div>The combination of direct and inverse Chladni patterns to sort particles or control their motion was primarily studied in liquids through theoretical and numerical studies. The few proposed experimental demonstrations relied on micrometric or millimetric-scale vibrating systems. This work describes a proof of concept for sorting particles in the air using direct and inverse Chladni patterns of a vibrating plate at the decimetric scale. The plate has well-defined modal shapes and resonance frequencies thanks to controlled simply-supported boundary conditions. Sorting possibilities are evaluated using three materials of different densities and types (table salt, lycopodium powder, and iced tea dry mix). Our experimental results confirm numerical results from the literature and indicate that particles can be sorted according to their density or size using direct and inverse Chladni patterns. Finally, perspectives on applications and domains for this prototype aimed at <em>vibrosorting</em> particles are briefly discussed, and directions for future works are suggested.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120867"},"PeriodicalIF":4.5,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Manipulating lithium-ion storage behavior of high entropy oxide (FeCoNiCrMn)3O4 by tuning crystallinity","authors":"Dan Wang ,&nbsp;Xiao Li ,&nbsp;Tongde Gu ,&nbsp;Yanni Li ,&nbsp;Xiaojing Wen ,&nbsp;Qing Wang ,&nbsp;Yanguo Liu ,&nbsp;Xiwei Qi ,&nbsp;Zhiyuan Wang","doi":"10.1016/j.powtec.2025.120910","DOIUrl":"10.1016/j.powtec.2025.120910","url":null,"abstract":"<div><div>Transition-metal-based high entropy oxides (HEOs) are emerging anode materials for lithium-ion batteries with high theoretical capacities as well as the unique entropy stabilization mechanism. Herein, a high-efficiency microwave solvothermal method is adopted to synthesize the multicomponent high entropy oxide anode (FeCoNiCrMn)₃O₄, and the subsequent heat treatment temperature is finely regulated to investigate the effect of crystallization degree on lithium storage mechanism and electrochemical performance of HEOs. With the increase of sintering temperature, the HEOs undergo amorphous, weakly crystallized, and completely crystallized states without any phase separation in any state benefiting from the unique nucleation and growth mechanism under the microwave and solvothermal combined action. Among the as-prepared HEOs, the HEO-300 anode with an amorphous structure shows smaller grain sizes and higher valence states of metal ions, which provide more active sites under the pseudocapacitor-dominated lithium storage mechanism. A high lithium storage capacity of 679.3 mAh g⁻¹ under 500 mA g⁻¹ after 300 cycles is obtained for HEO-300, and it also exhibits an excellent rate performance. This work provides a new strategy for fabricating high-efficiency high entropy oxide electrodes for energy storage devices; and expounds the relationship between the crystalline degree of HEO and energy storage behavior.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120910"},"PeriodicalIF":4.5,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of particle size, distribution, and morphology on bulk shear behavior of milled loblolly pine","authors":"Tiasha Bhattacharjee,&nbsp;Jordan Klinger,&nbsp;Eric Fillerup,&nbsp;Susan Carilli,&nbsp;Magdalena Salazar Casajus,&nbsp;Wencheng Jin,&nbsp;Yidong Xia","doi":"10.1016/j.powtec.2025.120911","DOIUrl":"10.1016/j.powtec.2025.120911","url":null,"abstract":"<div><div>Due to the anisotropic, non-uniform, and highly compressible nature of biomass granular materials it is challenging to accurately characterize bulk shear and flow performance. This work investigates these complexities by connecting shear behavior of milled loblolly pine with its particle size and morphology. Samples with incremental sizes, and ranges of size distributions were characterized to elucidate the impacts of overall particle scale, and the competing factors of size distribution. A Schulze rotary shear tester was used to perform tests at different consolidation stresses that are typically experienced in industrial scale equipment. Experimental data was then statistically analyzed using multidimensional linear regression, and empirical relationships for apparent cohesion and unconfined yield strength were developed. The results show that both increase with decreasing average particle size. Regression analysis revealed that cohesion for the incrementally classified particles was well described by accounting for the preshear normal stress as well as the ratio of particle surface area to the cross-sectional area (a generalized parameter that captures gross differences in particle morphology and surface roughness). Comparatively, the cumulatively distributed samples were explained by the preshear normal stress, the size of the relatively small particles (10 % cumulative passing size), and the span of the sieve size distribution (90 %–10 % cumulative passing sizes). Combining these parameters to estimate all the measured data resulted in good prediction (R² = 0.95, RMSE = 0.07) of the collected data. The established correlations between material properties and bulk shear response provide a mechanistic interpretation of biomass variability in flow performance. The developed correlations eliminate the need for extensive testing in specialized equipment and provide a method to qualitatively interpret the impacts of changing material attributes on resultant shear properties.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120911"},"PeriodicalIF":4.5,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of turbulence intensity on the shear detachment dynamics of bubble-particle","authors":"Wenqing Shi ,&nbsp;Hongji Chen ,&nbsp;Shihao Ding ,&nbsp;Xiahui Gui ,&nbsp;Yijun Cao ,&nbsp;Yaowen Xing","doi":"10.1016/j.powtec.2025.120908","DOIUrl":"10.1016/j.powtec.2025.120908","url":null,"abstract":"<div><div>Turbulence-induced bubble-particle detachment is a primary factor contributing to the low recovery rates of coarse particle flotation, garnering significant attention in recent years. Existing turbulence detachment theories predominantly categorize detachment mechanisms based on the motion characteristics of particles or bubbles, while overlooking the influence of shear flow fields at varying turbulence intensities on the stability of mineralized aggregates. The kinetic mechanisms underlying shear turbulence-induced detachment remain unclear. In this study, we investigate the detachment mechanism of particles and bubbles induced by shear turbulence using a custom-designed fluid channel. First, high-speed camera technology is employed to examine the dynamic detachment behavior of aggregates under different flow field intensities. Subsequently, particle image velocimetry (PIV) is utilized for in situ characterization and synchronized visualization of the flow field surrounding the bubble-particle detachment process. Results indicate that under the influence of the shear flow field, aggregate detachment occurs in three stages: bubble stretching and deformation, contact line sliding and contraction, and necking and rupture of the bubble. During the contact line sliding and contraction stage, a pattern of alternating contraction at the left and right contact points is observed. Furthermore, as the fluid velocity gradient increases, the detachment angle of the aggregates decreases, the detachment time increases, and the residual bubble size enlarges. Analysis of the flow field through PIV reveals that as fluid velocity within the channel increases, the flow transitions from stable laminar to complex, highly unstable turbulence, ultimately resulting in the formation of vortices of varying sizes and shapes around the particles. As turbulence intensity rises, the average flow field velocity and turbulence kinetic dissipation rate required for bubble-particle detachment in shear turbulence all increase. This study also finds a close correlation between the dynamic detachment behavior of aggregates and the vortex structures, whereby lateral vortices drive bubble deflection and the forward fluid shear force induces bubble detachment. The findings are expected to provide crucial theoretical guidance for understanding the kinetic mechanisms of bubble-particle detachment under shear turbulence.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120908"},"PeriodicalIF":4.5,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}