Results in MaterialsPub Date : 2026-03-01Epub Date: 2025-12-29DOI: 10.1016/j.rinma.2025.100883
Seyed Mohammad Ali Mortazavi Moghadam, Ramin Hashemi
{"title":"Investigating the effect of annealing on the forming limit and mechanical properties of tri-layer copper/304L stainless steel /copper composite sheets","authors":"Seyed Mohammad Ali Mortazavi Moghadam, Ramin Hashemi","doi":"10.1016/j.rinma.2025.100883","DOIUrl":"10.1016/j.rinma.2025.100883","url":null,"abstract":"<div><div>In addition to mechanical resistance, ductility is an essential property of multilayer metal composites. Therefore, in this study, the effect of annealing temperature (450, 600, and 750 °C) on the mechanical properties and ductility of copper/304L stainless steel/copper composite (Cu/304L/Cu) sheets produced by cold roll bonding (CRB) was investigated. The results showed that the CRB process significantly increases tensile strength and hardness, while decreasing elongation. However, due to recrystallization, the annealing treatment can moderate the effects of these changes in mechanical properties. Also, the composite's microstructure shows that at 600 °C, complete crystallization occurs in the 304L steel layer. Also, dimples in the SEM images indicate ductile fracture in the annealed samples. The dimples become deeper as the annealing temperature increases, confirming the greater formability. In addition, after plotting the forming limit diagram, it was found that the annealing heat treatment improves the ductility of the Cu/304L/Cu composite.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"29 ","pages":"Article 100883"},"PeriodicalIF":0.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145939045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Results in MaterialsPub Date : 2026-03-01Epub Date: 2025-12-11DOI: 10.1016/j.rinma.2025.100850
G. Ravi , Jonah , R. Arulmani
{"title":"Optimization of spin arc GMAW process and welding of Inconel 718 superalloy","authors":"G. Ravi , Jonah , R. Arulmani","doi":"10.1016/j.rinma.2025.100850","DOIUrl":"10.1016/j.rinma.2025.100850","url":null,"abstract":"<div><div>Inconel 718 alloy widely used in aerospace applications must be joined under lower heat input conditions during out-of-position welding. The recently developed novel spin arc welding method has extensive industrial applications owing to its all-position welding capability, increased productivity, and high-quality welds. The weld quality is influenced by spin diameter (D), spin speed (N), welding speed (S), welding current, etc., and a better quality could be achieved by optimizing the process. In this study, influences of D, N, and S on depth of penetration (DP), bead height (BH), and bead width (BW) were explored using regression models. N had a greater influence on DP, BH, and BW than D. The spin-arc process was optimized using the desirability technique to obtain the maximum DP, BH, and minimum BW. Aged Inconel 718 alloy disc was joined at the optimum condition and characterized. The weld metal microstructure exhibited a columnar dendritic structure without cracks and an absence of carbides in the heat affected zone (HAZ) and weld metal (WM). WM contained a uniform distribution of Nb and Laves constituents and the mean volume fractions of Nb and laves were 10.5 ± 1.5 % and 18 ± 2.55 %, respectively. WM micro-hardness was higher than that of other regions and the joint strength was slightly lower than BM.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"29 ","pages":"Article 100850"},"PeriodicalIF":0.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145939074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Results in MaterialsPub Date : 2026-03-01Epub Date: 2025-12-17DOI: 10.1016/j.rinma.2025.100875
Tetiana Melnychenko, Anatolii Ustinov
{"title":"Effect of the chemical composition of multilayer Ni/Al foil on its deformation behaviour during heating under load","authors":"Tetiana Melnychenko, Anatolii Ustinov","doi":"10.1016/j.rinma.2025.100875","DOIUrl":"10.1016/j.rinma.2025.100875","url":null,"abstract":"<div><div>Multilayer foils (MFs) derived from reaction systems such as Ni/Al are promising interlayers for forming permanent joints by soldering or diffusion bonding. To obtain soldered joints in the MF, a self-propagating high-temperature synthesis (SHS) reaction is initiated. During diffusion bonding, the reaction-diffusion in the MF is controlled by external heating of the joint zone, thereby reducing heat generation there. The authors of many works showed that, in addition to the MF effect on diffusion processes in the welded zone, there is a correlation between the deformation behaviour of MFs and joint-process parameters. In this work, the impact of the chemical composition of the MF on its deformation behaviour during heating under constant load conditions was investigated using the Ni/Al MF with component ratios of 1:3, 1:1, and 3:1, corresponding to the intermetallics Al<sub>3</sub>Ni, AlNi, and AlNi<sub>3</sub>, respectively. It was shown that the deformation behaviour of MFs changes drastically with an increase in the nickel content from 1:3 to 3:1, due to the activation of various plastic deformation mechanisms. It turns out that the monotonic increase in the rate of plastic deformation upon heating of MF with a ratio of 1:3 is due to its superplastic flow by the mechanism of intergranular slip. The non-monotonic temperature dependence of the rate of deformation of MF with a ratio of 1:1 or 3:1 is realised by both the mechanism of intergranular slip and superplastic flow due to phase transformations that occur only within certain temperature intervals.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"29 ","pages":"Article 100875"},"PeriodicalIF":0.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145799768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Results in MaterialsPub Date : 2026-03-01Epub Date: 2025-12-12DOI: 10.1016/j.rinma.2025.100862
Laila El haidami, Mohammed Afsi, Hamane Lemziouka, Lamiae Mrharrab
{"title":"Theoretical investigation of structural, electronic, elastic, thermodynamic, and optical characteristics of novel Fluoro-perovskites FrHF3 (H = Mg, Ca) using DFT calculations","authors":"Laila El haidami, Mohammed Afsi, Hamane Lemziouka, Lamiae Mrharrab","doi":"10.1016/j.rinma.2025.100862","DOIUrl":"10.1016/j.rinma.2025.100862","url":null,"abstract":"<div><div>This study investigates the structural, mechanical, electronic, optical, and thermodynamic properties of FrHF<sub>3</sub> (H = Mg, Ca) perovskites using Density Functional Theory (DFT) with the Generalized Gradient Approximation (GGA) and the Perdew-Burke-Ernzerhof (PBE) exchange-correlation functional. The structural and mechanical stability of these phases is confirmed by their negative formation enthalpy, tolerance factor, and positive phonon dispersion curves, indicating their potential for experimental synthesis. The compounds exhibit direct band gaps, with an increase from 5.932 eV (FrMgF<sub>3</sub>) to 6.47 eV (FrCaF<sub>3</sub>), influencing their optoelectronic behavior. The electronic structure was analyzed using partial (PDOS) and total (TDOS) density of states to assess electron localization across different energy bands. Additionally, the ELATE program was employed to evaluate elastic tensors and generate 2D and 3D representations. High bulk and Young's moduli suggest promising industrial applications for FrHF<sub>3</sub> (H = Mg, Ca). The analysis of mechanical properties, including Pugh's ratio, Poisson's ratio, and Cauchy pressure, reveals that FrMgF<sub>3</sub> is ductile (Poisson's ratio = 0.31), whereas FrCaF<sub>3</sub> is brittle (Poisson's ratio = 0.25). Both compounds exhibit anisotropic characteristics. Optical properties, including dielectric function, absorption coefficient, optical conductivity, loss function, refractive index, reflectivity, extinction coefficient, transmittance, and absorbance, were examined. The materials demonstrate strong UV absorption, 327,109.25 cm<sup>−1</sup> for FrMgF<sub>3</sub> and 302,462.55 cm<sup>−1</sup> for FrCaF<sub>3</sub>, as well as high optical conductivity, with peak values of 6.66 (1/fs) and 6.30 (1/fs) for FrMgF<sub>3</sub> and FrCaF<sub>3</sub>, respectively. Additionally, their significant absorption index makes them suitable for applications in sensors, photodetectors, optoelectronics, and other optical technologies.</div><div>Debye temperatures exceeding 200 K indicate high sound velocities, elevated melting points, and low minimum thermal conductivities, suggesting potential use in thermal barrier coatings (TBCs). Thermodynamic properties, such as specific heat capacity and entropy, were evaluated across a temperature range of 0–1000 K.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"29 ","pages":"Article 100862"},"PeriodicalIF":0.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145799769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Results in MaterialsPub Date : 2026-03-01Epub Date: 2025-12-09DOI: 10.1016/j.rinma.2025.100840
Mehedi Hasan , Most Laboni Begum
{"title":"Development of an eco-friendly and cost-effective hydrogel composite utilizing leather shaving dust for solid waste reduction, heavy metal removal, wastewater treatment, and sustainable goods production","authors":"Mehedi Hasan , Most Laboni Begum","doi":"10.1016/j.rinma.2025.100840","DOIUrl":"10.1016/j.rinma.2025.100840","url":null,"abstract":"<div><div>This study reports the development of a cost-effective and eco-friendly hydrogel composite (HC) by incorporating leather shaving dust (SD), a tannery byproduct, into an acrylamide-based polymer matrix. The composite was synthesized using acrylamide as a monomer, potassium persulfate as an initiator, and N, N′-Methylenebisacrylamide as a crosslinker. Comprehensive characterization was conducted to evaluate swelling behavior, mechanical performance, heavy metal adsorption, types of interactions of heavy metals in hydrogel composite, comparison with other adsorbent, theoretical explanation of the adsorbing and mechanical reusability of hydrogel composite, kinetics of the heavy metal adsorption, biodegradability, and cost-effectiveness. The composite exhibited excellent swelling properties, with swelling ratios varying according to shaving dust content and acrylamide concentration. Mechanical testing was demonstrated enhanced tensile strength, reaching a maximum fracture stress of 17.7 kPa at 9 % SD, and compressive strength peaking at 0.082 MPa under similar conditions. Adsorption experiments revealed high uptake capacities for cadmium (52 mg g<sup>−1</sup>, 37.5 %), chromium (17.8 mg g<sup>−1</sup>, 9.3 %), and lead (12.7 mg g<sup>−1</sup>, 47.3 %), with efficiency plateauing at higher metal concentrations due to saturation. The composite also demonstrated partial biodegradability, with the SD fraction degrading within weeks to months, and could be regenerated for up to 10 reuse cycles. Cost analysis estimated a production cost of approximately $0.77 per liter, which is projected to decrease significantly under mass production. Beyond wastewater remediation, the hydrogel composite showed potential for manufacturing biodegradable and water-absorbing goods such as agricultural membranes, moisture-retaining packaging, and biomedical devices. These findings establish the hydrogel composite as a scalable, sustainable material that addresses dual challenges of heavy metal pollution and industrial waste management, while offering a viable alternative to conventional plastics in alignment with circular economy principles.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"29 ","pages":"Article 100840"},"PeriodicalIF":0.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145799840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Results in MaterialsPub Date : 2026-03-01Epub Date: 2025-12-16DOI: 10.1016/j.rinma.2025.100872
Bualoy Chanpaka , Krisda Suchiva , Supa Wirasate
{"title":"Phase transfer study on the effects of metal ions on storage hardening of natural rubber","authors":"Bualoy Chanpaka , Krisda Suchiva , Supa Wirasate","doi":"10.1016/j.rinma.2025.100872","DOIUrl":"10.1016/j.rinma.2025.100872","url":null,"abstract":"<div><div>The storage hardening of natural rubber (NR) has long been investigated; however, its mechanism remains unclear. Most work has focused on proteins and phospholipids, whereas the role of metal ions is poorly understood. This study, therefore, examined the metal-ion effect under real storage conditions. Phase transfer (PT) experiments were used to evaluate their influence. PTNR samples showed that about 2.6 % of Mg<sup>2+</sup>, 63.2 % of Ca<sup>2+</sup>, and 31.1 % of Fe<sup>2+</sup> were transferred to the organic phase with NR. Except for Fe<sup>2+</sup>, the metal ions added were hardly transferred. PT samples contained 0.02–0.05 % nitrogen, indicating that bonded proteins moved with NR, whereas free ones remained in the aqueous phase. The storage modulus (G′) measurements showed pronounced storage hardening in WNR, with G′ increasing by 25–40 kPa over 2 months. In contrast, PTNR and metal-PTNR exhibited only minimal changes (±10 kPa), indicating stable viscoelastic behavior. The gel content of PT samples (1.5–1.9 %) was lower than that of WNR (6.0–6.2 %), and showed no significant change during storage. These findings showed that the residual bonded proteins and metal ions (Mg<sup>2+</sup>, Ca<sup>2+</sup>, and Fe<sup>2+</sup>) did not contribute significantly to the storage hardening, suggesting that the phenomenon originated from interactions involving other non-rubber constituents rather than intrinsic polyisoprene properties.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"29 ","pages":"Article 100872"},"PeriodicalIF":0.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145799842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Results in MaterialsPub Date : 2026-03-01Epub Date: 2026-03-02DOI: 10.1016/j.rinma.2026.100913
Cidong Jiang , Pengjun Chen , Yu Cheng , Qiang Liu , Chenping Deng , Halefom G. Desta , Dong Tian , Bin Lin
{"title":"Design, preparation and application of a novel NaP zeolite-based slow-release fertilizer via resource recovery from coal gangue","authors":"Cidong Jiang , Pengjun Chen , Yu Cheng , Qiang Liu , Chenping Deng , Halefom G. Desta , Dong Tian , Bin Lin","doi":"10.1016/j.rinma.2026.100913","DOIUrl":"10.1016/j.rinma.2026.100913","url":null,"abstract":"<div><div>The sustainable valorization of coal gangue, a significant industrial byproduct, represents an urgent environmental challenge and opportunity for resource recovery. Herein, we report a machine learning-optimized hydrothermal synthesis of high-purity NaP zeolite directly from untreated coal gangue for developing an efficient phosphorus slow-release fertilizer. Through precise control of crystallization parameters (160 °C, 36 h in 2 mol L<sup>−1</sup> NaOH), spherical NaP zeolite crystals with uniform morphology and exceptional structural integrity were achieved without energy-intensive pre-calcination steps. Phosphorus nutrient loading via mechanical activation created a composite with controlled release kinetics, demonstrating a cumulative P release of only 39.4% over 30 days—significantly lower than conventional fertilizers. Mechanistic analysis revealed a biphasic release profile characterized by an initial burst (first week) followed by sustained nutrient delivery, directly attributable to the unique pore architecture of NaP zeolite (pore dimensions: 0.31 × 0.44 nm and 0.26 × 0.49 nm). In comparative rice cultivation studies, plants treated with our zeolite-based fertilizer exhibited 45.2% longer root systems than urea-treated seedlings despite lower initial shoot growth, indicating preferential allocation of resources to root development. This work establishes a closed-loop strategy for transforming coal waste into high-value agricultural materials while addressing critical challenges in nutrient management and environmental sustainability. Our machine learning approach to parameter optimization provides a blueprint for accelerating discovery in sustainable resource recovery.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"29 ","pages":"Article 100913"},"PeriodicalIF":0.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147396193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Results in MaterialsPub Date : 2026-03-01Epub Date: 2026-01-19DOI: 10.1016/j.rinma.2026.100899
Hadis Homay Razavi, Roohollah Jamaati, Mohammad Rajabi, Mohabbat Amirnejad
{"title":"Cyclic heat treatment (CHT): A technique for enhancement of strength-ductility synergy in low-carbon steel","authors":"Hadis Homay Razavi, Roohollah Jamaati, Mohammad Rajabi, Mohabbat Amirnejad","doi":"10.1016/j.rinma.2026.100899","DOIUrl":"10.1016/j.rinma.2026.100899","url":null,"abstract":"<div><div>In the present work, to increase the strength-ductility balance and eliminate the yield point phenomenon in low-carbon steel (Fe-0.09C), the high-temperature austenitization and cyclic heat treatment (CHT) followed by water quenching were performed. The microstructures of all CHT samples showed a combination of fine and coarse grains due to different austenite nucleation in cementite-rich and cementite-free grain boundaries. The microstructure of the CHT sheets at 810 °C consisted of ferrite, grain boundary cementite, and a low fraction of martensite with low tetragonality. However, the microstructure of the CHT sheets at 860 °C showed ferrite, hard martensite, and retained austenite. With the increase in the number of CHT cycles, the grain size of ferrite slightly increased. Also, the grain size in the heat-treated sheets at 810 °C was slightly smaller than the heat-treated sheets at 860 °C due to the dissolution of more grain boundary cementite. The yield point phenomenon (YPP) was severe at the lower CHT temperature owing to the smaller martensite fraction. With the increase in the number of heat treatment cycles, the yield point elongation increased due to the decrease in the amount of carbon in the formed martensites, and as a result, the decrease in tetragonality, the reduction in volume changes, and the decrease in the density of geometrically necessary dislocations in this sample. The heat-treated sheets at 860 °C had higher strength compared to the heat-treated sheets at 810 °C, owing to the formation of more martensite in the heat-treated steels at 860 °C. The CHT sample at 860 °C after the fourth cycle exhibited the best strength-ductility balance, and the YPP was completely eliminated owing to the formation of retained austenite and hard martensite. In this sample, an unexpected strain-hardening behavior (recovery of strain-hardening rate) was seen as caused by the formation of twins in the retained austenite. Severe necking and the formation of large and deep dimples indicated that all samples have experienced intense plastic deformation (ductile fracture). Many grain boundary dimples were present on the fracture surface of the heat-treated samples at 810 °C.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"29 ","pages":"Article 100899"},"PeriodicalIF":0.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146090705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Material-to-compost ratio is key for biodegradation of microbial polyester-based composite in home-composting conditions","authors":"Héloïse Bazart , Valérie Guillard , Nathalie Gontard , Lucile Chatellard","doi":"10.1016/j.rinma.2026.100908","DOIUrl":"10.1016/j.rinma.2026.100908","url":null,"abstract":"<div><div>In the context of increasing plastic pollution, the potential widespread use of biodegradable packaging requires clarification of the little-studied impact of material loading ratios on biodegradation performance in home-composting environments. The biodegradability of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and PHBV/cellulose composite, either shredded or as whole thin films, was studied for up to 12 months under home-composting conditions using EN NF ISO 14855-1 respirometry protocols. The material-to-compost ratios tested were 1/3, 1/30, and 1/50, simulating 100%, 10% and 6% food packaging substitution by the tested biodegradable materials, respectively. Regardless of material nature and form, a high loading ratio of 1/3 (100% substitution) decreased the biodegradation rate by up to tenfold compared to a loading ratio of 1/50. Such high loading ratios create inhibitory conditions that can overshadow the increased surface area gained through grinding. Meanwhile, at low loading ratios (1/50 and 1/30), film grinding increases biodegradation rates by up to 3.2-fold for all materials. The ultimate biodegradation of shredded materials significantly exceeds 100%, reaching up to 131% for PHBV powdered film at a loading ratio of 1/30. This suggests an 'overactivation' (or priming) effect of the inoculum induced by the materials, leading to CO<sub>2</sub> overproduction that does not derive directly from material biodegradation. This priming effect appears limited by dilution effect at the low 1/50 loading ratio and by substrate inhibition at the high 1/3 loading ratio.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"29 ","pages":"Article 100908"},"PeriodicalIF":0.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147396253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Results in MaterialsPub Date : 2026-03-01Epub Date: 2025-12-20DOI: 10.1016/j.rinma.2025.100877
Oliver Voigt, Thomas Buchwald, Malena Staudacher, Urs Alexander Peuker
{"title":"Upcycling of electro discharge machining sludge for metal powder manufacturing–Filtration, washing and separation","authors":"Oliver Voigt, Thomas Buchwald, Malena Staudacher, Urs Alexander Peuker","doi":"10.1016/j.rinma.2025.100877","DOIUrl":"10.1016/j.rinma.2025.100877","url":null,"abstract":"<div><div>Sludges from electro discharge machining were processed to reuse metallic particles. The sludge was characterized before dissolving the dielectric with acetone or isopropanol. Pressure filtration experiments were carried out and filter cake resistances computed. To improve material quality, filter cakes were submitted to displacement washing and dilution washing. All filtrates were collected and investigated. Processed particles were visually investigated by scanning electron microscopy and chemically regarding their carbon and oxygen content. Afterward, dry particles were separated by sieving and sifting, fractions analyzed and the separation characterized. Specific filtration resistances show values of 10<sup>14</sup>m<sup>−2</sup>. Isopropanol significantly increased processing times compared to acetone. Filter cake washing led to slight improvements of surface quality of particles. For displacement washing, better results were achieved for acetone with approx. 99.5 % removed impurities. Carbon and oxygen contents were in a good range using acetone. Using isopropanol led to detrimentally increased oxygen contents. Particles were separated into fractions for further applications in additive manufacturing. The sifting device applied exhibits a high separation efficiency, with a high sharpness parameter. Several parameter sets were developed for separating particle sizes and powder mixtures. Thermal treatment removed carbon contaminations and oxygen layers on particle surfaces. This work provides a flow scheme for processing oily metallic sludges to obtain a secondary raw material powder.</div></div>","PeriodicalId":101087,"journal":{"name":"Results in Materials","volume":"29 ","pages":"Article 100877"},"PeriodicalIF":0.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145939043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}