Powders - Science topic

The paper was dedicated to a comparative study on the performance of gas atomized (GA) and rotating-disk atomized (RDA) aluminum alloy powders produced on industrial scale for laser directed energy deposition (L-DED) process. The powder characteristics, the printing process window, and the quality, microstructure, and mechanical properties of print...

Moringa oleifera leaves are a promising source of protein and nutrients, they are superior to other plants in protein content and nutritional value. the present study was conducted to improve the nutritional value of date energy bars by fortifying with Moringa oleifera leaves powder (MLP) as a source of protein and calcium. MLP was added to date en...

In this study, we proposed alternative spreading techniques aimed at enhancing the powder bed properties in powder bed fusion additive manufacturing, utilizing discrete element simulations. Our findings revealed significant alterations in the powder spreading regime depending on the adopted spreading strategies. In powder spreading with two blades,...

Densification of metallic and ceramic materials within the context of binder jetting additive manufacturing (BJAM) presents a considerable technical challenge. This study leveraged a bimodal feedstock powder design, in conjunction with cold isostatic pressing (CIP), to optimize the green density of BJAMed Inconel 718 (IN718) superalloy. This approa...

The fracture behavior of a duplex stainless steel processed by laser powder bed fusion (LPBF) from mixed 25Cr + 5 wt.% Ni powders (i.e., 25Cr-5Ni) was compared to 25Cr that was processed without Ni but additionally heat-treated (i.e., 25Cr-HT) to give similar phase fractions of austenite and ferrite but with different micro and mesostructures. The...

This study investigates the ignition behavior of recycled iron particles under varying coflow temperature conditions to evaluate their reactivity and suitability for regeneration experiments. Experiments were conducted at coflow temperatures of 750°C, 800°C, and 850°C, with ignition percentages consistently exceeding 85% across all conditions. The...

This study presents a combined numerical and experimental analysis of heat and mass transfer in mare’s milk during vacuum sublimation drying, which is a process essential for producing high-quality powdered products. The numerical model was developed using two-dimensional simulations and validated against experimental data obtained for varying samp...

Boron suboxide (B 6 O), offering a good balance between abundance of its constituents and promising tribological performance, is intriguing. Applications such as cutting tools, high-wear resistant coatings, and ballistics would benefit from such properties, however a feasible synthesis method is yet to be realized. The synthesis of B 6 O under atmo...

A facile method named metal compression molding (MCM) is developed using the 17‐4PH stainless steel feedstock derived from powder injection molding. Complex golf‐club featuring intricate surfaces, thin walls, and thick walls are fabricated via MCM. Simulation software Moldflow is used to study the flow behavior, pressure, and shear rates of feedsto...

Domestic gas burners are a significant source of indoor air pollution and contribute substantially to household energy consumption. While transitioning to carbon-free fuels, such as hydrogen, presents considerable safety challenges, blending hydrogen with conventional fuels can improve combustion efficiency and reduce emissions. However, factors li...

The main component of high-capacity silicon-based electrodes is silicon powder, which necessitates intricate processing to minimize volume growth and powder separation while guaranteeing the ideal Si content. This work uses the an situ high-pressure forming approach to create an MXene/m-Si/MXene composite electrode, where MXene refers to Ti3C2TX, a...

Description Suppose you buy a new washing machine. The manual tells you that the new machine is covered by a warranty for the first year. The manual also says that, on average, 10% of machines will need service in the first year. So, the absolute risk of the machine needing service in the first year is 10%. The risk of needing service in the first...

This study evaluated the efficacy of dried Nerium oleander powder in controlling bacterial wilt (BW) in tomatoes. The experiment applied the powder to pathogen-contaminated soil using mulching and mixing techniques, testing two particle sizes (fine and coarse) at four doses (0 g, 14 g, 28 g, and 42 g). Laboratory results showed that all powder conc...

Palabras Clave: Resistencia, calidad, polvo de piedra, polietileno de alta densidad 1. INTRODUCCIÓN Hoy en día el plástico se ha convertido en un material muy popular utilizado por la gente porque es un material liviano y tiene muy buena resistencia a la humedad y es menos susceptible a la corrosión, por lo que tiende a convertirse en un material d...

In this study, a solution combustion synthesis method was employed using polyvinylpyrrolidone (PVP) as fuel to prepare LiFePO4 (LFP) powders. The effects of PVP contents on the structural, microstructural, and electrochemical properties were investigated by various characterization methods. The as-combusted powders were calcined at 750 °C for 6 h u...

The inherent physico-chemical properties of commercial konjac powders often limited their application across various industries. While existing modification techniques had produced konjac powders with diverse physical attributes, these methods were frequently associated with high costs and environmental concerns. Hence, there was a critical need to...

Impacted by heavy corrosion and poor connections, zinc (Zn) powders have rarely been considered as the raw materials of Zn‐ion aqueous batteries (ZABs). Nonetheless, the ease of controlling loadings of Zn powders entitles ZABs to better capacity match between negative and positive electrodes. Here, a simple and rapid chemical solution passivation m...

This study details the creation of NFG/Fe3O4 and NFG/SiCnw composites utilizing selective laser sintering (SLS) technology, along with a range of postprocessing methods for structural‐functional integration in electromagnetic microwave absorption, based on the preparation of hybrid powders. The NFG/Fe3O4 composite, after vacuum impregnation with ep...

Additive manufacturing (AM) of H13 tool steel using the powder bed fusion (PBF) method is often limited by issues such as porosity (including lack of fusion, gas, and keyhole porosity), balling formation, and elemental segregation. These factors significantly impact the mechanical properties of the final product. This research investigates how volu...

Powder bed fusion of metals using a laser beam (PBF‐LB/M) is an additive manufacturing process for the direct production of metallic components using metal powder as a starting material. In order to improve the properties of the PBF‐LB/M components and increase the process efficiency by improving the laser absorption and the flowability of the meta...

A method has been proposed for photoinduced hyperthermia of pathogenic Gram-negative bacteria P. aeruginosa using Gd 2 O 3 :Yb micropowder. It is based on the possibility of laser excitation of anti-Stokes luminescence on ytterbium ions in the gadolinium oxide micropowder, which allows us, on the one hand, to heat the powder to the required tempera...

Masking or encapsulating spirulina has been widely used to overcome unpleasant flavours and aromas. Masking procedures, including rehydration, mixing, and heating, might impact the characteristic of spirulina powder. This study aimed to identify the relationship between variables spirulina masking using maltodextrin and develop the model to optimiz...

In this work, Gd(P 0.5 V 0.5)O 4 : x at.% Eu 3+ phosphors with different dopant concentrations (x = 1, 3, 5, 6, 7, 9) were synthesized through chemical coprecipitation method. The phosphors were characterized by XRD, SEM, infrared spectroscopy, photoluminescence excitation, emission spectra and CIE. The results of XRD indicate that the obtained pho...

This research discusses the fabrication of a nickel matrix nanocomposite reinforced with in situ synthesized layered Ni3Al intermetallics using mechanical alloying (MA) and spark plasma sintering (SPS). In contrast to ex situ methods that frequently produce weak interfaces, the in situ approach enhances bonding and mechanical performance by using l...

The production of pure copper leads to the creation of a large amount of copper slag waste. The use of these wastes as a substitute for aggregate can greatly contribute to environmental problems. It should be noted that the high costs of experimental work and the time-consuming nature of scientific research in the experimental environment have led...

High‐pressure, high‐temperature synthesis at 12 GPa between 750 and 1000 °C for 30 to 300 min yields the last missing rare‐earth metal monogermanide, YbGe. Powder and single‐crystal X‐ray diffraction measurements reveal that the compound crystallizes in a FeB‐type structure (space group Pnma, a=7.901(2) Å, b=3.8981(9) Å, and c=5.873(2) Å). The resu...

By incorporating scandium oxide (Sc2O3) powder into a PVA film, a Sc2O3 saturable absorber (SA) was successfully developed, boasting a modulation depth of 25%. When integrated into a ring erbium‐doped fiber laser, the Sc2O3‐SA facilitated the production of mode‐locked dark pulses featuring multi‐wavelength emission, leveraging its saturable absorbi...

Experimental studies were carried out to determine the temperature and emissivity of 316L powder steel. It was found that the emissivity of powder steel varied from 0.33 to 0.58 in the temperature range from 59 °C to 900 °C. Based on the proposed methodology for quantitative assessment of temperature measurement uncertainty, it was established that...

The sintered diffusion multiple (SDM) method, which has been developed in our research group, has been applied to determine the entire composition range of the CrMnFeCoNi high-entropy alloy stereoscopically and continuously over nearly the entire range. The samples were prepared by sintering mixed elemental powders and were annealed at 970 °C or 80...

Hardened concrete is stable in compression and weak in tension. To address this predicament, we introduce reinforcements in the concrete. It is a known fact that glass products are globally viable non-biodegradable environmentally hazardous material and Sisal fiber on the other hand is a ubiquitcous natural fiber. Glass substances when ground to po...

The laser-beam powder-bed fusion (PBF-LB) method enables the semi-automatic fabrication of complex three-dimensional structures, making it useful for dental prostheses. However, residual stress during fabrication can cause deformation. Herein, we applied the segmented-scan strategy to three-unit fixed dental prostheses (FDPs) and evaluated its effe...

Understanding the atomic-scale structural dynamics of phase transformations is crucial for developing materials and tailoring their properties. However, many materials are obtained as polycrystalline powders with large unit cells and/or complex structures, making it challenging to investigate detailed structural changes using conventional X-ray dif...

X-ray diffraction and thermal analyses, electron microscopy, Brunnauer-Emmett-Teller method, and infrared spectroscopy were used to study the products of coprecipitated indium and dysprosium hydroxides obtained under different conditions of aging in the mother liquor. The paper analyzed the effect of aging conditions on the phase composition, degre...

Inconel 718 (IN718) is a polycrystalline nickel-based superalloy and one of the most widely used materials in the aerospace industry owing to its excellent mechanical performances at high temperatures, including creep resistance. Interest in additively manufactured components in aerospace is greatly increasing due to their ability to reduce materia...

This study introduces iodine‐assisted thermal annealing of commercially sourced molybdenum disulfide (MoS₂) powders to significantly enhance their dispersion yield, exfoliation efficiency, and compatibility across a wide range of solvents. This method leverages iodine as a transport agent during annealing (800–1200 °C), leading to the removal of ox...

The paper presents selected findings from a combined theoretical and experimental investigation focusing on chemical reactions and strength gain in glass powder (GP) and calcium hydroxide (CH) mixes as a means of achieving more than the current wisdom of ~20% cement replacement with waste glass powder in concrete. The expected chemical reactions be...

In this study, the possibility of employing ZrN/AlSi10Mg composite powders with 10, 20, and 30 wt% ZrN and a low‐pressure cold spraying (CS) unit to enhance the surface properties of AlSi10Mg obtained through laser powder bed fusion (LPBF) is investigated for the first time. A high‐energy ball mill is used to produce composite powders from AlSi10Mg...

Powder-based fire extinguishing methods are widely used to suppress fires of all kinds efficiently. However, these methods have several drawbacks, the most significant being the large powder residue left behind, which can complicate cleanup and damage sensitive equipment. The present paper investigates reacting flows and develops a methodology for...

The effects of high-temperature modified phosphogypsum (HPG), incorporated at contents of 40%, 50%, and 60%, on the compressive strength and elastic modulus of mortar and concrete were investigated. Additionally, the influence of graded granulated blast furnace slag powder (GGBS), quicklime, and silica fume on the mechanical properties of HPG-based...

Residual elastic strains and the resulting stresses are key aspects of most metal additive manufacturing (AM) approaches and strongly affect both the build process and part performance. Computational modeling of these stresses allows the manufacturer to compensate for the distortions that occur during the build process and to predict where part fai...

Porosity is an unavoidable problem in aluminium alloy wire-arc directed energy deposition (DED), becoming even more prominent in aluminium-matrix powder core wires, which significantly limits their performance and application potential. This study combines wire-arc DED technology with Al-matrix powder cored wire for the first time, successfully fab...

Despite widespread industrial reliance on powder compaction in manufacturing, a complete understanding of the underlying physical mechanisms that lead to pore structure, mechanical strength, and defects remains elusive, challenging ongoing efforts to optimize the process and improve product quality. The discrete element method (DEM) is a promising...

This paper describes the simulation of the S (scattering)-parameters and absorbed energy for polymeric nanocomposites with metallic insertions (iron and aluminum, with two particle dimensions). The considered frequency domain, 0.1–3 GHz, is specific for a wide range of applications in microwave technologies. The actual limitations of electromagneti...

The assessment of shear stiffness characteristics at the contact of particles is important in multi-scale modeling of geological materials and other problems involving powders and grains. Generally speaking, the Mindlin–Deresiewicz model is very often used to fit the shear load–deflection response curves for non-conforming contacts; however, this m...

Diamond-wire sawing silicon waste (DSSW) derived from the silicon wafer sawing process may lead to resource waste and environmental issues if not properly utilized. This paper propounds a simple technique aimed at enhancing the efficiency of hydrogen production from DSSW. The hydrolysis reaction is found to become faster when DSSW is ground. Among...

Additive manufacturing (AM) of metal structures is transforming industries by enabling the creation of complex, efficient, and customizable components. This article explores key AM technologies for metals, including Powder Bed Fusion (PBF), Directed Energy Deposition (DED), Binder Jetting, Metal Extrusion, and Sheet Lamination. Each is analyzed in...

In this work, we focused on the characterization of closed-cell Al foams and aluminum honeycomb panels, in particular their energy absorption capacity under conditions of static compressive stress. Through experimental tests, the specific energy absorbed by different samples was evaluated: in the honeycomb panels the mechanical behavior was analyze...

We performed high-resolution powder neutron diffraction experiments and discovered an elliptic helical incommensurate magnetic structure in the semiconducting rare-earth magnet YbCuS2, featuring effective spin-1/2 Yb$^{3+}$ ions that form a zigzag chain. Upon cooling the sample to 0.2 K, we observed very weak magnetic peaks indexed with an incommen...

The production and recovery of methane as a potential clean energy source not only reduces carbon emissions and mitigates climate change, but also improves energy efficiency compared with conventional fossil fuels. In recent years, the study of efficient catalytic conversion of hydrocarbons using inclusion crystals as photocatalysts has been widely...

Owing to their outstanding performances significantly superior to that of the low‐ and medium‐entropy counterparts, high‐entropy diborides attracted extensive attention. Nevertheless, the rising configuration entropy of high‐entropy diborides rendered not only the better performances but also the greater formation difficulty due to the strengthened...

Background: For over a decade, endoscopic hemostatic powders have been used to manage upper gastrointestinal bleeding (UGIB). Various preclinical benchtop and animal models have been developed to evaluate these devices. Multiple companies have released hemostatic powders to market, assessing their safety and efficacy using an established porcine ga...

Advances in additive manufacturing technology expanded the possibilities for heat sink design. This work introduces the design, optimization, and performance of a novel inclined rib mini-channel heat sink (IR-MCHS) fabricated by additive manufacturing, which is developed based on traditional rectangular straight mini-channel heat sinks (RS-MCHS) an...

Actualizing the near net-shaping of lightweight aluminum (Al) alloys with both superior mechanical performance and complex geometry remains challenging. To address this issue, novel Al–Ti–C–B (TCB) master alloy powders were tailored as effective inoculators and introduced into the AlSi10Mg alloy powders to promote the heterogeneous nucleation of α-...

Laser Metal Deposition (LMD) is emerging among metal Additive Manufacturing technologies due to its wide range of applications. This technique represents an evolution of laser cladding, currently used for fabricating and repairing complex metal components, promoting manufacturing sustainability. One of the main drawbacks hindering the widespread us...

The sustainability of AM is strongly related to the ability of producing functional parts using minimal resources. In-situ monitoring saves energy and material by providing information to support process stops in case of anomalous events detected in critical regions. In this work, AlSi10Mg samples with different defect conditions were PBF-LB/M manu...

In this study, the microstructure and defects of an Al-Mn-Mg-Zr alloy produced by the Powder Bed Fusion–Laser Beam (PBF-LB) technology are investigated. The influence of the process parameters on the microstructure and defects is demonstrated. Aluminum alloys are usually prone to cracking during solidification. However, finding the optimal paramete...

The optical, electrical, and thermal properties of indium selenides are strongly influenced by their crystal structure. At room temperature (RT), the indium selenide with the stoichiometry In2Se2 exhibits two coexisting crystalline phases namely α and β, both can crystallize in two different crystal structures, hexagonal (2H) and rhombohedral (3 R)...

Laser powder bed fusion (LPBF)-fabricated Ni-based alloys with high γ′ phase fractions generally suffer from cracking that limits their applications. This study presents SD247, a novel alloy that overcomes the challenge of cracking issues and exhibits superior mechanical properties after heat treatment. Compared to CM247LC, SD247 exhibited a lower...

Solid oxide fuel cells have received attention from researchers all over the world as a new energy source for the future. Various types of cathode materials for solid oxide cells have been developed to improve the cell’s performance. Novel cathode material Nd2 − xMgxNiO4 (x = 0-0.025, NMNO), which with A2BO4 type R-P structure (a perovskite-like st...