Advanced Powder Technology最新文献

英文中文

Hurst analysis via multi-scale resolution to diagnose flow regimes in gas–solid micro-fluidized beds

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-01-31 DOI: 10.1016/j.apt.2025.104805

Yanjun Li , Xue Li , Yupeng Du , Likun Ma

Micro-fluidized beds (MFBs) with an ultra-fast energy transmission rate and high wall flux have recently attracted considerable interest. The hydrodynamic behavior in the MFBs has been demonstrated to deviate from the ones in the laboratory-scale fluidized beds (LFBs) because of the prominent wall effect. In order to understand the influence of the wall effect on flow regime transformation, a comprehensive experimental analysis, considering the effects of bed diameter, static bed height, and the properties of particles, was conducted using pressure drop data and visualization images. A new Hurst analysis, combined with a multi-scale resolution methodology, has been established to diagnose flow regimes, which successfully reflected the bubble characteristics of the fluidization system on the meso-scale. A generalized flow regime diagram was proposed based on the analysis of experimental data, and the influence of key factors on the velocity of flow pattern transformation was further investigated. On this basis, in the absence of preset function forms, the data-driven symbolic regression method was used to simultaneously search for the equation form and various parameters of the prediction correlation, and an empirical correlation formula for predicting the transformation of each flow pattern was automatically generated with excellent predictability. It is believed that this work is helpful for selecting desired fluidization conditions in practical applications, and this methodology can be expanded to the analysis of other complex systems with multi-scale characteristics.

{"title":"Hurst analysis via multi-scale resolution to diagnose flow regimes in gas–solid micro-fluidized beds","authors":"Yanjun Li , Xue Li , Yupeng Du , Likun Ma","doi":"10.1016/j.apt.2025.104805","DOIUrl":"10.1016/j.apt.2025.104805","url":null,"abstract":"<div><div>Micro-fluidized beds (MFBs) with an ultra-fast energy transmission rate and high wall flux have recently attracted considerable interest. The hydrodynamic behavior in the MFBs has been demonstrated to deviate from the ones in the laboratory-scale fluidized beds (LFBs) because of the prominent wall effect. In order to understand the influence of the wall effect on flow regime transformation, a comprehensive experimental analysis, considering the effects of bed diameter, static bed height, and the properties of particles, was conducted using pressure drop data and visualization images. A new Hurst analysis, combined with a multi-scale resolution methodology, has been established to diagnose flow regimes, which successfully reflected the bubble characteristics of the fluidization system on the <em>meso</em>-scale. A generalized flow regime diagram was proposed based on the analysis of experimental data, and the influence of key factors on the velocity of flow pattern transformation was further investigated. On this basis, in the absence of preset function forms, the data-driven symbolic regression method was used to simultaneously search for the equation form and various parameters of the prediction correlation, and an empirical correlation formula for predicting the transformation of each flow pattern was automatically generated with excellent predictability. It is believed that this work is helpful for selecting desired fluidization conditions in practical applications, and this methodology can be expanded to the analysis of other complex systems with multi-scale characteristics.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 3","pages":"Article 104805"},"PeriodicalIF":4.2,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152800","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}

引用次数: 0

Rational design of new micrometer-sized radiopaque composites embedded with electromagnetic shielding materials for transcatheter arterial embolisation against hepatocellular carcinoma

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-01-31 DOI: 10.1016/j.apt.2025.104806

Lingling Chen , Zhaoxiong Guo , Mianrong Chen , Ou Liu , Qinglin Xiao , Yongyan Ma , Piaoyi Chen , Yugang Huang , He Wang , Kangshun Zhu , Guodong Ye

Transcatheter arterial embolization (TAE) is a commonly used interventional procedure for hepatocellular carcinoma. However, the commonly used interventional embolization microspheres (e.g. polyvinyl alcohol) are unable to be observed under imaging devices and has to be visualized with exogenous contrast agents (e.g. iohexol), which may lead to intraoperative ectopic embolization. In this study, we synthesized poly(multi-allyl sucrose ether) visualization embolization microspheres encapsulating titanium carbide particles (TiC@PSAE) with sucrose backbone and encapsulated with electromagnetic shielding materials TiC. The synthesis method used in this study is a photo-driven radical-mediated cyclization reaction (PRMC), which enables the preparation of PSAE from sucrose multi-allyl ether monomers without degradation chain transfer. The morphology is spherical with a particle size range of 80–260 μm that can realize target embolization. Through in vivo rabbit experiments, the blood flow to the embolized kidneys is obstructed, and the embolized rabbit ears have a significant visualization effect under computed tomography (CT), demonstrating that TiC@PSAE microspheres have good imaging effects.

{"title":"Rational design of new micrometer-sized radiopaque composites embedded with electromagnetic shielding materials for transcatheter arterial embolisation against hepatocellular carcinoma","authors":"Lingling Chen , Zhaoxiong Guo , Mianrong Chen , Ou Liu , Qinglin Xiao , Yongyan Ma , Piaoyi Chen , Yugang Huang , He Wang , Kangshun Zhu , Guodong Ye","doi":"10.1016/j.apt.2025.104806","DOIUrl":"10.1016/j.apt.2025.104806","url":null,"abstract":"<div><div>Transcatheter arterial embolization (TAE) is a commonly used interventional procedure for hepatocellular carcinoma. However, the commonly used interventional embolization microspheres (e.g. polyvinyl alcohol) are unable to be observed under imaging devices and has to be visualized with exogenous contrast agents (e.g. iohexol), which may lead to intraoperative ectopic embolization. In this study, we synthesized poly(multi-allyl sucrose ether) visualization embolization microspheres encapsulating titanium carbide particles (TiC@PSAE) with sucrose backbone and encapsulated with electromagnetic shielding materials TiC. The synthesis method used in this study is a photo-driven radical-mediated cyclization reaction (PRMC), which enables the preparation of PSAE from sucrose multi-allyl ether monomers without degradation chain transfer. The morphology is spherical with a particle size range of 80–260 μm that can realize target embolization. Through <em>in vivo</em> rabbit experiments, the blood flow to the embolized kidneys is obstructed, and the embolized rabbit ears have a significant visualization effect under computed tomography (CT), demonstrating that TiC@PSAE microspheres have good imaging effects.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 3","pages":"Article 104806"},"PeriodicalIF":4.2,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143151450","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}

引用次数: 0

Study on the effect of acidification reaction conditions on the pore structure of coal samples based on 2D NMR T1-T2

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-01-28 DOI: 10.1016/j.apt.2025.104792

Guanhua Ni , Yingxue Cui , Zhao Li , Tao Yang , Sicong Ma , Xu Wang , Huixin Qiu

Acidification is one of the commonly used techniques to improve the efficiency of mine dust control. In order to study the effect of acidification conditions on the pore structure of the reservoir, coal acidification experiments were carried out at different temperatures and pressures, and the pore structure was quantitatively characterized by combining with NMR technology. The results showed that the porosity of coal samples increased from 5.8465% to 10.3502%; the signal peak intensity of 2D spectrum increased from 8.72 to 44.8; φ_N and φ_NF of coal samples were positively proportional to the acidification conditions, while D_T and D_F were inversely proportional to the temperature and pressure conditions. Therefore, increasing the acidification temperature and pressure conditions can effectively expand the pore space of coal and enhance the connectivity between pores. By changing the physical–chemical structure of the coal seam through acidification, the purpose of dust control at source can be achieved.

{"title":"Study on the effect of acidification reaction conditions on the pore structure of coal samples based on 2D NMR T1-T2","authors":"Guanhua Ni , Yingxue Cui , Zhao Li , Tao Yang , Sicong Ma , Xu Wang , Huixin Qiu","doi":"10.1016/j.apt.2025.104792","DOIUrl":"10.1016/j.apt.2025.104792","url":null,"abstract":"<div><div>Acidification is one of the commonly used techniques to improve the efficiency of mine dust control. In order to study the effect of acidification conditions on the pore structure of the reservoir, coal acidification experiments were carried out at different temperatures and pressures, and the pore structure was quantitatively characterized by combining with NMR technology. The results showed that the porosity of coal samples increased from 5.8465% to 10.3502%; the signal peak intensity of 2D spectrum increased from 8.72 to 44.8; <em>φ<sub>N</sub></em> and <em>φ<sub>NF</sub></em> of coal samples were positively proportional to the acidification conditions, while <em>D</em><sub>T</sub> and <em>D</em><sub>F</sub> were inversely proportional to the temperature and pressure conditions. Therefore, increasing the acidification temperature and pressure conditions can effectively expand the pore space of coal and enhance the connectivity between pores. By changing the physical–chemical structure of the coal seam through acidification, the purpose of dust control at source can be achieved.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 3","pages":"Article 104792"},"PeriodicalIF":4.2,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152797","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}

引用次数: 0

Temperature and radiation characteristics of the continuous injection flame of a zirconium dust cloud

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-01-27 DOI: 10.1016/j.apt.2025.104781

Qiuhong Wang , Bin Peng , Jun Deng , Chi-Min Shu , Qingfeng Wang , Guoqiang Dong , Di Wu

The exothermic properties of zirconium powder make it widely used in aerospace, military, atomic energy and other fields. The temperature and radiation characteristics of the continuous jet flame of zirconium dust cloud were studied by a self-designed experimental system. For the zirconium powder injection flame temperature, a comprehensive correction equation for thermocouple temperature measurement was developed for the continuous dust-feeding combustion particle load flow. When the dust cloud concentrations in the non-intermittent flame area are 328.48, 410.35, and 483.59 g/m³, respectively: at the spectral wavelength of 5.0 μm, the zirconium dust cloud jet flame emissivity values are 0.2, 0.19, and 0.18; the maximum flame temperature are 2147.5, 2248.1, and 2377.8 °C; the radiant heat flux characteristics of continuous jet flame of zirconium dust cloud were evaluated by heat flow meter, and the radiant heat fluxes on the surface of zirconium jet flame were calculated to be 42.82, 64.99, and 55.96 kW/m². It is found that the flame emissivity is linearly negatively correlated with the maximum flame temperature of the zirconium jet flame, and the thermal radiation is mainly concentrated in the jet flame body of the zirconium dust cloud.

{"title":"Temperature and radiation characteristics of the continuous injection flame of a zirconium dust cloud","authors":"Qiuhong Wang , Bin Peng , Jun Deng , Chi-Min Shu , Qingfeng Wang , Guoqiang Dong , Di Wu","doi":"10.1016/j.apt.2025.104781","DOIUrl":"10.1016/j.apt.2025.104781","url":null,"abstract":"<div><div>The exothermic properties of zirconium powder make it widely used in aerospace, military, atomic energy and other fields. The temperature and radiation characteristics of the continuous jet flame of zirconium dust cloud were studied by a self-designed experimental system. For the zirconium powder injection flame temperature, a comprehensive correction equation for thermocouple temperature measurement was developed for the continuous dust-feeding combustion particle load flow. When the dust cloud concentrations in the non-intermittent flame area are 328.48, 410.35, and 483.59 g/m<sup>3</sup>, respectively: at the spectral wavelength of 5.0 μm, the zirconium dust cloud jet flame emissivity values are 0.2, 0.19, and 0.18; the maximum flame temperature are 2147.5, 2248.1, and 2377.8 °C; the radiant heat flux characteristics of continuous jet flame of zirconium dust cloud were evaluated by heat flow meter, and the radiant heat fluxes on the surface of zirconium jet flame were calculated to be 42.82, 64.99, and 55.96 kW/m<sup>2</sup>. It is found that the flame emissivity is linearly negatively correlated with the maximum flame temperature of the zirconium jet flame, and the thermal radiation is mainly concentrated in the jet flame body of the zirconium dust cloud.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 3","pages":"Article 104781"},"PeriodicalIF":4.2,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152213","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}

引用次数: 0

A comprehensive study of flame retardancy of phosphorous functionalized graphene by microwave assistance for cotton fabric

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-01-27 DOI: 10.1016/j.apt.2025.104786

Kshama D. Lokhande, Navin D. Satardekar, Mahesh P. Bondarde, Madhuri A. Bhakare, Pratik S. Dhumal, Surajit Some

The increased number of fire accidents cause risk to human life, economy, and environment. There is an urgent need to design and develop efficient flame retardants to reduce the fire risks. Cotton clothes have been utilized in all human life to make them more convenient. But despite its wide utilization, its quick ignition makes it vulnerable to accidents. The present article is based on the preparation of covalently functionalized phosphorous grafting flame retardants for cotton fabric. The microwave irradiation facilitates the rapid synthesis of highly efficient flame retardant material from graphene oxide and polyphosphoric acid (PPA). In this method, in-situ basic reduced GO (BRGO) was synthesized and interacted with phosphorus functional groups, where negative counterparts of BRGO readily reacted with PPA leading to the formation of strong phosphorous and oxygen covalent bonds. The resultant P@BRGO is then coated on cotton fabric and checked for its flame retardancy by using spirit lamp test, vertical flammability test (VFT) and limiting oxygen index (LOI). The spirit lamp test reveals that the P@BRGO protected the cotton fiber from ignition for up to 754 s on continuous flame, while BRGO endowed cotton sustain for up to only 24 s. The mean LOI of P@BRGO/cotton is 43.14 % which is considerably higher than that of BRGO/cotton (23.04 %) and blank fabric (17.8 %). The present work reflects the easy preparation of RGO, which can be converted into value added, highly efficient FR material.

{"title":"A comprehensive study of flame retardancy of phosphorous functionalized graphene by microwave assistance for cotton fabric","authors":"Kshama D. Lokhande, Navin D. Satardekar, Mahesh P. Bondarde, Madhuri A. Bhakare, Pratik S. Dhumal, Surajit Some","doi":"10.1016/j.apt.2025.104786","DOIUrl":"10.1016/j.apt.2025.104786","url":null,"abstract":"<div><div>The increased number of fire accidents cause risk to human life, economy, and environment. There is an urgent need to design and develop efficient flame retardants to reduce the fire risks. Cotton clothes have been utilized in all human life to make them more convenient. But despite its wide utilization, its quick ignition makes it vulnerable to accidents. The present article is based on the preparation of covalently functionalized phosphorous grafting flame retardants for cotton fabric. The microwave irradiation facilitates the rapid synthesis of highly efficient flame retardant material from graphene oxide and polyphosphoric acid (PPA). In this method, in-situ basic reduced GO (BRGO) was synthesized and interacted with phosphorus functional groups, where negative counterparts of BRGO readily reacted with PPA leading to the formation of strong phosphorous and oxygen covalent bonds. The resultant P@BRGO is then coated on cotton fabric and checked for its flame retardancy by using spirit lamp test, vertical flammability test (VFT) and limiting oxygen index (LOI). The spirit lamp test reveals that the P@BRGO protected the cotton fiber from ignition for up to 754 s on continuous flame, while BRGO endowed cotton sustain for up to only 24 s. The mean LOI of P@BRGO/cotton is 43.14 % which is considerably higher than that of BRGO/cotton (23.04 %) and blank fabric (17.8 %). The present work reflects the easy preparation of RGO, which can be converted into value added, highly efficient FR material.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 3","pages":"Article 104786"},"PeriodicalIF":4.2,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152214","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}

引用次数: 0

Hydrothermal assisted fabrication of ZnWO4:Yb3+/Er3+ nanophosphors with color tunable upconversion luminescence of enhanced thermal stability

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-01-23 DOI: 10.1016/j.apt.2025.104790

Lijie Gao , Yun Wang , Meiting Li , Xuejiao Wang , Qi Zhu , Ji-Guang Li

ZnWO₄:Yb³⁺/Er³⁺ upconversion (UC) nanophosphors were successfully synthesized by hydrothermal reaction at 180 ℃ and subsequent calcination at 700 ℃ for crystallinity improvement and better incorporation of dopant ions. The phosphors were analyzed to emit green (∼533 nm; ²H_11/2 → ⁴I_15/2 transition of Er³⁺), green (∼546 nm; ⁴S_3/2 → ⁴I_15/2) and red (∼660 nm; ⁴F_9/2 → ⁴I_15/2) light under 980 nm laser excitation, all through a two-photon process. The incorporation of Na⁺ and K⁺, especially K⁺, was found to remarkably modify the UC performance of Er³⁺, in terms of red/green intensity ratio (luminescence color), fluorescence lifetime and thermal stability of luminescence, which was rationalized by considering ⁴F_7/2 + ⁴I_11/2 → ⁴F_9/2 cross relaxation and lattice defects/local structure. The optimal ZnWO₄:0.08Yb³⁺,0.02Er³⁺ phosphor, which contains ∼ 0.97 at.% Na⁺ and 0.16 at.% K⁺, was demonstrated to have the potential for optical temperature sensing with the thermally coupled ²H_11/2/⁴S_3/2 energy levels of Er³⁺.

{"title":"Hydrothermal assisted fabrication of ZnWO4:Yb3+/Er3+ nanophosphors with color tunable upconversion luminescence of enhanced thermal stability","authors":"Lijie Gao , Yun Wang , Meiting Li , Xuejiao Wang , Qi Zhu , Ji-Guang Li","doi":"10.1016/j.apt.2025.104790","DOIUrl":"10.1016/j.apt.2025.104790","url":null,"abstract":"<div><div>ZnWO<sub>4</sub>:Yb<sup>3+</sup>/Er<sup>3+</sup> upconversion (UC) nanophosphors were successfully synthesized by hydrothermal reaction at 180 ℃ and subsequent calcination at 700 ℃ for crystallinity improvement and better incorporation of dopant ions. The phosphors were analyzed to emit green (∼533 nm; <sup>2</sup>H<sub>11/2</sub> → <sup>4</sup>I<sub>15/2</sub> transition of Er<sup>3+</sup>), green (∼546 nm; <sup>4</sup>S<sub>3/2</sub> → <sup>4</sup>I<sub>15/2</sub>) and red (∼660 nm; <sup>4</sup>F<sub>9/2</sub> → <sup>4</sup>I<sub>15/2</sub>) light under 980 nm laser excitation, all through a two-photon process. The incorporation of Na<sup>+</sup> and K<sup>+</sup>, especially K<sup>+</sup>, was found to remarkably modify the UC performance of Er<sup>3+</sup>, in terms of red/green intensity ratio (luminescence color), fluorescence lifetime and thermal stability of luminescence, which was rationalized by considering <sup>4</sup>F<sub>7/2</sub> + <sup>4</sup>I<sub>11/2</sub> → <sup>4</sup>F<sub>9/2</sub> cross relaxation and lattice defects/local structure. The optimal ZnWO<sub>4</sub>:0.08Yb<sup>3+</sup>,0.02Er<sup>3+</sup> phosphor, which contains ∼ 0.97 at.% Na<sup>+</sup> and 0.16 at.% K<sup>+</sup>, was demonstrated to have the potential for optical temperature sensing with the thermally coupled <sup>2</sup>H<sub>11/2</sub>/<sup>4</sup>S<sub>3/2</sub> energy levels of Er<sup>3+</sup>.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 3","pages":"Article 104790"},"PeriodicalIF":4.2,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152799","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}

引用次数: 0

Numerical simulation of ductile metal powder compaction using advanced distinct element method

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-01-22 DOI: 10.1016/j.apt.2025.104782

Ryo Tokunaga , Daiki Hiruta , Kizuku Kushimoto , Junya Kano , Satoshi Motozuka

Metal powder compaction is widely employed in industries to manufacture parts such as gears, bearings, and soft magnetic composites (SMCs). The advanced distinct element method (ADEM), which can simulate plastic deformation and any particle shape, is promising for simulating metal powders that have broad-range characteristics, such as ductile or brittle powders with isotropic or anisotropic shapes. In this study, experimental compaction tests and simulations were conducted on spherical (i.e., isotropic) and flake-like (i.e., anisotropic) ductile pure-iron powders to confirm the validity of using the ADEM to simulate metal powder compaction. Single-particle compression tests were also conducted to identify the simulation parameter affecting the elastic and plastic behaviors of the powders. In the case of spherical-powder compaction simulation, the stress–strain curve determined by particle movement and deformation behavior was found to be consistent with the experimental results. Thus, the ADEM adequately simulates not only particle deformation but also the frictional force between particles and the die wall, which play an important role in powder compaction. Further, in the simulation of the flake-like powder, the ADEM again reproduced key experimental results well.

{"title":"Numerical simulation of ductile metal powder compaction using advanced distinct element method","authors":"Ryo Tokunaga , Daiki Hiruta , Kizuku Kushimoto , Junya Kano , Satoshi Motozuka","doi":"10.1016/j.apt.2025.104782","DOIUrl":"10.1016/j.apt.2025.104782","url":null,"abstract":"<div><div>Metal powder compaction is widely employed in industries to manufacture parts such as gears, bearings, and soft magnetic composites (SMCs). The advanced distinct element method (ADEM), which can simulate plastic deformation and any particle shape, is promising for simulating metal powders that have broad-range characteristics, such as ductile or brittle powders with isotropic or anisotropic shapes. In this study, experimental compaction tests and simulations were conducted on spherical (i.e., isotropic) and flake-like (i.e., anisotropic) ductile pure-iron powders to confirm the validity of using the ADEM to simulate metal powder compaction. Single-particle compression tests were also conducted to identify the simulation parameter affecting the elastic and plastic behaviors of the powders. In the case of spherical-powder compaction simulation, the stress–strain curve determined by particle movement and deformation behavior was found to be consistent with the experimental results. Thus, the ADEM adequately simulates not only particle deformation but also the frictional force between particles and the die wall, which play an important role in powder compaction. Further, in the simulation of the flake-like powder, the ADEM again reproduced key experimental results well.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 3","pages":"Article 104782"},"PeriodicalIF":4.2,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143152795","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}

引用次数: 0

High-temperature performance of geopolymer mortars containing ceramic filter press cake and pottery waste powders

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-01-01 DOI: 10.1016/j.apt.2024.104732

Zahide Bayer Öztürk , Ayşe Eser , Serhat Çelikten , İsmail İsa Atabey

The sustainable management of Ceramic Tile Filter Press Cake Powder (FPW) and Pottery Shard Waste Powder (PW) is crucial to reducing environmental harm in the ceramics sector. These ceramic byproducts offer a valuable source of aluminosilicate powders, which can be used in the synthesis of geopolymer mortars as an innovative alternative to traditional raw materials. This study focuses on repurposing these materials as binders in geopolymer mortars and evaluating their performance after exposure to elevated temperatures. Geopolymers were formulated with varying FPW/PW ratios (100/0, 75/25, 50/50, 25/75, 0/100) and cured thermally at 90°C for either 6 or 24 h. Strength tests were conducted on mortars before and after heating at 400, 600, and 800°C. Selected samples underwent crystal structure (XRD) and microstructural (SEM/EDX) analyses both before and after thermal exposure. The results indicated that 24-hour cured geopolymers exhibited better initial strength, while the 6-hour cured mortars demonstrated superior residual strength post-heating. Geopolymers with higher FPW content displayed greater thermal resistance than those with higher PW content. Overall, ceramic waste proved to be a viable alternative material for producing geopolymers, offering an effective solution for waste reduction in the ceramics industry.

{"title":"High-temperature performance of geopolymer mortars containing ceramic filter press cake and pottery waste powders","authors":"Zahide Bayer Öztürk , Ayşe Eser , Serhat Çelikten , İsmail İsa Atabey","doi":"10.1016/j.apt.2024.104732","DOIUrl":"10.1016/j.apt.2024.104732","url":null,"abstract":"<div><div>The sustainable management of Ceramic Tile Filter Press Cake Powder (FPW) and Pottery Shard Waste Powder (PW) is crucial to reducing environmental harm in the ceramics sector. These ceramic byproducts offer a valuable source of aluminosilicate powders, which can be used in the synthesis of geopolymer mortars as an innovative alternative to traditional raw materials. This study focuses on repurposing these materials as binders in geopolymer mortars and evaluating their performance after exposure to elevated temperatures. Geopolymers were formulated with varying FPW/PW ratios (100/0, 75/25, 50/50, 25/75, 0/100) and cured thermally at 90°C for either 6 or 24 h. Strength tests were conducted on mortars before and after heating at 400, 600, and 800°C. Selected samples underwent crystal structure (XRD) and microstructural (SEM/EDX) analyses both before and after thermal exposure. The results indicated that 24-hour cured geopolymers exhibited better initial strength, while the 6-hour cured mortars demonstrated superior residual strength post-heating. Geopolymers with higher FPW content displayed greater thermal resistance than those with higher PW content. Overall, ceramic waste proved to be a viable alternative material for producing geopolymers, offering an effective solution for waste reduction in the ceramics industry.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 1","pages":"Article 104732"},"PeriodicalIF":4.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102542","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}

引用次数: 0

Full title (Editorial Board Members)

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-01-01 DOI: 10.1016/S0921-8831(24)00451-5

引用次数: 0

In-flight droplet plasma atomization: A novel method for preparing ultrafine spherical powders

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-01-01 DOI: 10.1016/j.apt.2024.104757

Jier Qiu , Deping Yu , Yun Qu , Yu Xiao , Fei Zhang , Jian Zhang , Zhengjiang Gao

Ultrafine spherical powders (USP) with particle sizes below 45 μm are essential for various advanced manufacturing processes, including 3D printing, metal injection molding, cold spray, etc. However, conventional methods for preparing spherical powders are characterized by a broad particle size distribution (PSD), which reduces the yield of ultrafine powders and increases production costs. To address this challenge, a novel method named in-flight droplet plasma atomization (IDPA) has been developed. This method involves three key stages, i.e., formulation of large droplet, generation of high-temperature atomization fluid, and breakup of large droplet. As the core of the IDPA process, the breakup of droplets significantly impacts the PSD, which is predominantly regulated by the flow-controlling nozzle. To elucidate the underlying mechanisms of the large droplet breakup, this study firstly investigates the operational sustainability through experimental analysis of electro-thermal characteristics and corresponding temperature distribution of the flow-controlling nozzle. Results show that maintaining the nozzle temperature within an optimal range is important to avoid clogging and reduce mechanical wear, thus ensuring continuous operation of the IDPA process. Then, a numerical simulation model of the large droplet breakup process within the flow-controlling nozzle was developed to investigate the USP formation and facilitate the prediction of PSD. By employing the IDPA method to prepare USP, ultrafine particle size with a d90 of 27.97 µm, PSD within a range from 5.27 to 56.2 µm, high spheroidization ratio approaching 100 %, and the complete absence of hollow powders have been achieved in the prepared atomized powders. It’s proved that IDPA is a viable and efficient approach for the production of USP.

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