Powder Metallurgy and Metal Ceramics最新文献_第7页

Structure and Distribution of Chemical Elements in the Transition Zone in Deposited VT20 and VT1-0 Alloy Samples 沉积的VT20和VT1-0合金样品过渡区化学元素的结构与分布

IF 0.9 4区材料科学

Powder Metallurgy and Metal Ceramics Pub Date : 2023-11-17 DOI: 10.1007/s11106-023-00383-4

A. A. Skrebtsov, O. S. Omelchenko, J. I. Kononenko, A. M. Kaplunovska

{"title":"Structure and Distribution of Chemical Elements in the Transition Zone in Deposited VT20 and VT1-0 Alloy Samples","authors":"A. A. Skrebtsov, O. S. Omelchenko, J. I. Kononenko, A. M. Kaplunovska","doi":"10.1007/s11106-023-00383-4","DOIUrl":"10.1007/s11106-023-00383-4","url":null,"abstract":"Buildup (or additive manufacturing) processes enable the production of components where individual sections can possess distinct chemical compositions tailored to their specific purpose. However, the distribution of elements in the fusion zone and its sizes remain inadequately understood. Samples of VT1-0 and VT20 titanium alloys were fused so that the VT1-0 alloy powder was deposited onto the VT20 cast alloy in one case and the VT20 titanium alloy powder was deposited onto the VT1-0 cast alloy in the other. Regardless of the grain-size and chemical compositions of the powders, the chemical composition of the samples met relevant standards for the alloys. The macrostructures were studied employing a Neophot 32 optical microscope. Minimal porosity was revealed in the samples across all deposition options. Microstructural analysis showed that the deposited material formed a uniform structure both longitudinally and transversely. The microstructure in zones with specific chemical compositions resembled that of the associated as-cast alloys. Variations in the sizes and shapes of structural components were observed toward the powder/cast metal fusion line. A distinct transition zone was found in the fusion of titanium alloys with different chemical compositions. The chemical composition in the longitudinal and transverse sections in the powder/cast metal fusion zone was examined with a scanning electron microscope. The chemical composition was established at different distances from the fusion line. The results showed that the chemical elements redistributed and their contents changed. The presence of zones with altered chemical composition was ascertained by microstructural studies. The distribution of chemical elements was qualitatively assessed and found to be uniform.","PeriodicalId":742,"journal":{"name":"Powder Metallurgy and Metal Ceramics","volume":"62 3-4","pages":"180 - 185"},"PeriodicalIF":0.9,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138534412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Production of Wear-Resistant Cobalt Alloy Powders 耐磨钴合金粉末的生产

IF 0.9 4区材料科学

Powder Metallurgy and Metal Ceramics Pub Date : 2023-11-17 DOI: 10.1007/s11106-023-00389-y

T. S. Cherepova, H. P. Dmitrieva, O. V. Yarovitsyn, O. V. Kondaurov, O. I. Boshko, O. M. Semirga

{"title":"Production of Wear-Resistant Cobalt Alloy Powders","authors":"T. S. Cherepova, H. P. Dmitrieva, O. V. Yarovitsyn, O. V. Kondaurov, O. I. Boshko, O. M. Semirga","doi":"10.1007/s11106-023-00389-y","DOIUrl":"10.1007/s11106-023-00389-y","url":null,"abstract":"To select and optimize the experimental conditions for producing powders from wear-resistant cobalt alloys, the following methods were tested: gas spraying of the KhTN-37 alloy, centrifugal spraying of the KhTN-61 alloy, cryogenic spraying of the KhTN-61 alloy, and ultrasonic plasma atomization of the KhTN-62 alloy melt. The production of particles in different sizes and shapes, the difference between the experimental values of their sizes, and the potential of using individual size fractions taking into account the industrial production requirements were analyzed and summarized. The gas spraying method used for the KhTN-37 alloy did not yield the required amount of suitable powder and was thus inexpedient. The centrifugal spraying method for the production of KhTN-61 alloy powders was characterized by a significant number of spherical/needle particles formed in the sprayed material, affecting its flowability and complicating sieving. In addition, this method did not reliably protect the sprayed material against oxygen. The cryogenic spraying process for producing KhTN-61 alloy powders turned out to be unsuitable because it changed the chemical composition. The method involving melt ultrasonic atomization turned out to be the most acceptable for producing KhTN-62 alloy powders. It yielded a fine spherical powder with the required particle size. The use of this rapidly hardened powder is promising for the development of wear- and oxidation-resistant surface layers on responsible components of friction units in power equipment, particularly in aircraft structures. The high-temperature wear-resistant alloy powders can be recommended for strengthening and restoring the surfaces of components in friction units in aviation equipment and for additive manufacturing of bulk parts (3D printing), possessing high wear resistance at elevated temperatures.","PeriodicalId":742,"journal":{"name":"Powder Metallurgy and Metal Ceramics","volume":"62 3-4","pages":"250 - 256"},"PeriodicalIF":0.9,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138534424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative Study of the Structure and Properties of Composite Materials Produced From Hydroxyapatite Glass Ceramics and Carbon Fibers of Different Types 羟基磷灰石玻璃陶瓷与不同类型碳纤维复合材料结构与性能的比较研究

IF 0.9 4区材料科学

Powder Metallurgy and Metal Ceramics Pub Date : 2023-11-17 DOI: 10.1007/s11106-023-00384-3

O. R. Parkhomey, V. D. Klipov, O. E. Sych, N. D. Pinchuk, T. V. Tomila, O. I. Bykov, A. O. Synytsia

{"title":"Comparative Study of the Structure and Properties of Composite Materials Produced From Hydroxyapatite Glass Ceramics and Carbon Fibers of Different Types","authors":"O. R. Parkhomey, V. D. Klipov, O. E. Sych, N. D. Pinchuk, T. V. Tomila, O. I. Bykov, A. O. Synytsia","doi":"10.1007/s11106-023-00384-3","DOIUrl":"10.1007/s11106-023-00384-3","url":null,"abstract":"A comparative study of the structure and properties of composite materials produced from biogenic hydroxyapatite/glass/carbon fibers, depending on the type of carbon fibers (activated carbon nanostructured fibers or cellulose fibers), was conducted employing scanning electron microscopy, X-ray diffraction, infrared spectroscopy, Brunauer–Emmett–Teller method, helium pycnometry, and in vitro experiments. The potential to produce a biogenic hydroxyapatite/glass/carbon fiber composite by sintering at 800°C, involving the simultaneous formation of carbon nanostructures during thermal destruction and carbonization of cellulose fibers, was ascertained. This method allows preserving the hydroxyapatite phase in the newly formed biogenic hydroxyapatite/glass/carbon fiber composite and ensures the presence of carbon nanostructures. The microstructure of the composites produced with activated carbon nanostructured fibers is characterized by the presence of these fibers, contrastingly to the composite produced with cellulose fibers, which has more homogeneous microstructure. Moreover, as opposed to cellulose fibers, activated carbon nanostructured fibers in the composite significantly increase (by more than three times) the specific surface area of the material and significantly reduce the particle size. Regardless of the carbon fibers used, the biogenic hydroxyapatite/glass/carbon fiber composites are nanostructured and microporous (pores < 2 nm). The resorption rate of the biogenic hydroxyapatite/glass/carbon (activated nanostructured or hydrated cellulose) fiber composites in the physiological solution within the first two days is significantly higher than that of the starting biogenic hydroxyapatite/glass composites because of changes in the porous structure.","PeriodicalId":742,"journal":{"name":"Powder Metallurgy and Metal Ceramics","volume":"62 3-4","pages":"203 - 214"},"PeriodicalIF":0.9,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138534394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Interaction in the Ni–Sc–Zr Ternary Alloys Along the 77.8 at.% Ni Section. Electrochemical Properties of the Alloys Ni-Sc-Zr三元合金沿77.8 at的相互作用。% Ni切片。合金的电化学性能

IF 0.9 4区材料科学

Powder Metallurgy and Metal Ceramics Pub Date : 2023-11-17 DOI: 10.1007/s11106-023-00388-z

O. L. Semenova, O. S. Fomichov, K. A. Meleshevich, V. M. Talash, Yu.B. Rudenko

{"title":"Interaction in the Ni–Sc–Zr Ternary Alloys Along the 77.8 at.% Ni Section. Electrochemical Properties of the Alloys","authors":"O. L. Semenova, O. S. Fomichov, K. A. Meleshevich, V. M. Talash, Yu.B. Rudenko","doi":"10.1007/s11106-023-00388-z","DOIUrl":"10.1007/s11106-023-00388-z","url":null,"abstract":"The interaction of Sc2Ni7 and Zr2Ni7 compounds (with C2/m and P63/mmc crystal structures and congruent melting temperatures of 1270 and 1438°C) in the ternary Ni–Sc–Zr system was studied employing physicochemical analysis methods (metallography, X-ray diffraction, differential thermal analysis, and electron microprobe analysis). The section between the compounds was shown to be quasibinary of peritectic type, with peritectic points of 1340 ± 13°C and 14 at.% Sc. At the peritectic temperature, about 10 at.% Zr dissolves in the Sc2Ni7-based phase and about 8 at.% Sc in the Zr2Ni7-based phase. Electrochemical studies conducted through cathodic polarization of the ternary Sc2Ni7 and Zr2Ni7 alloys using a PI-50-1 potentiostat, with a three-electrode electrochemical cell consisting of a working ceramic anode, a platinum cathode, an electrolyte (a 3% NaCl aqueous solution), and a silver chloride Ag/AgCl/KCl reference electrode, did not reveal any tendency to hydrogenation in their solid solutions. The influence of preliminary cathodic reduction of the 77.8 at.% Ni–8 at.% Sc–Zr sample on its subsequent anodic dissolution was determined. The initial surface of the 77.8 at.% Ni–8 at.% Sc–Zr sample was found to be much more resistant to anodic oxidation than the surface preliminary subjected to cathodic reduction because of a significant decrease in its oxide component.","PeriodicalId":742,"journal":{"name":"Powder Metallurgy and Metal Ceramics","volume":"62 3-4","pages":"241 - 249"},"PeriodicalIF":0.9,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138534439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Two Typical Microstructures of Ti–6.6Al–1.7Mo–2.3V–1.9Zr Alloy Fabricated by Vacuum Hot Pressing of Powders with the Spherical Shape of Particles 球形粉末真空热压制备Ti-6.6Al-1.7Mo-2.3V-1.9Zr合金的两种典型组织

IF 0.9 4区材料科学

Powder Metallurgy and Metal Ceramics Pub Date : 2023-11-17 DOI: 10.1007/s11106-023-00379-0

Yangju Feng, Yunbin Lu, Xuesong Liu

{"title":"Two Typical Microstructures of Ti–6.6Al–1.7Mo–2.3V–1.9Zr Alloy Fabricated by Vacuum Hot Pressing of Powders with the Spherical Shape of Particles","authors":"Yangju Feng, Yunbin Lu, Xuesong Liu","doi":"10.1007/s11106-023-00379-0","DOIUrl":"10.1007/s11106-023-00379-0","url":null,"abstract":"Two typical microstructures of Ti–6.6Al–1.7Mo–2.3V–1.9Zr (TA15) titanium alloy were successfully fabricated by vacuum hot pressing using TA15 metallic powders of two different sizes with the spherical shape of particles. The size of prior β grains was consistent with the size of the as-received TA15 alloy powder. The microstructure of TA15 alloys differed depending on the size of the initial powder, forming Widmanstätten patterns for the sample from coarse powder or equiaxed microstructure for fine powder. The microstructure evolution during the vacuum hot pressing included solid-state phase transition and powder compact. In the temperature-rise period, the solid-state phase transition occurred (α → β). The anterior β-grain only grew to the original powder interface, which means that it would not coarsen causing its size to exceed that of the original powder. The solid-state phase transition occurred (β → α) when the temperature decreased during the subsequent cooling process. The nuclei of grain boundaries α appeared at the grain boundary of the anterior β-grain. Then the nuclei of grain boundaries α grew together enclosing the anterior β-grain. The grain boundaries α belonged to a certain anterior β-grain and could provide nucleation sites for the α-colonies of the two adjacent anterior β-grains. Finally, the α colonies grew into the anterior β-grain forming the Widmanstätten structure. The two typical microstructures will likely affect the mechanical properties of the TA15 alloys. An improvement in tensile properties was evident in the TA15 alloys (equiaxed microstructure) fabricated from a fine powder compared to their predecessors, consisting of colonies α microstructure fabricated from the coarse powder. To be specific, the tensile strength increased from 849 to 898 MPa and the ductility growth was from 5.5 to 6.5%.","PeriodicalId":742,"journal":{"name":"Powder Metallurgy and Metal Ceramics","volume":"62 3-4","pages":"174 - 179"},"PeriodicalIF":0.9,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138534400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microwave Sintering of 3D Printed Composites from Polymers Reinforced with Titanium Nitride Particles 氮化钛颗粒增强聚合物3D打印复合材料的微波烧结研究

IF 0.9 4区材料科学

Powder Metallurgy and Metal Ceramics Pub Date : 2023-11-17 DOI: 10.1007/s11106-023-00380-7

O. B. Zgalat-Lozynskyy, O. O. Matviichuk, R. V. Litvyn, O. M. Myslyvchenko, N. O. Zgalat-Lozynska

{"title":"Microwave Sintering of 3D Printed Composites from Polymers Reinforced with Titanium Nitride Particles","authors":"O. B. Zgalat-Lozynskyy, O. O. Matviichuk, R. V. Litvyn, O. M. Myslyvchenko, N. O. Zgalat-Lozynska","doi":"10.1007/s11106-023-00380-7","DOIUrl":"10.1007/s11106-023-00380-7","url":null,"abstract":"The production of intricate samples from polymer–ceramic composites employing fused deposition modeling was studied. The samples were subjected to high-temperature heat treatment in microwave furnaces to yield titanium nitride ceramics. The conditions for making polymer–ceramic materials from polypropylene and titanium nitride powders and 3D printing conditions for associated intricate parts were examined. The TiN–polypropylene composite was produced at a temperature of 190°C through extrusion of a previously prepared homogeneous mixture with a reinforcement content of 10, 20, 40, 46, 50, and 60 vol.% TiN. Using fused deposition modeling, a gear-shaped part made of the polymer–ceramic material was printed. The printed samples with 20 and 40 vol.% TiN were heat-treated in microwave furnaces in air in a carbon black backfill and in a nitrogen flow. Following the heat treatment in microwave furnaces, the samples preserved their initial shape. The composite samples treated in a carbon black backfill in air exhibited a porosity of ~38% and those treated in a nitrogen flow showed a porosity of ~22%. The samples subjected to microwave heat treatment in a carbon black backfill in air underwent sintering and partial oxidation. After microwave heat treatment in a nitrogen flow, the titanium nitride samples showed higher density and bimodal structure with titanium nitride grains varying from several micrometers to 400–200 nm. The microhardness of the samples heat-treated in a carbon black backfill was 6.5–8.5 GPa and that of the samples treated in a nitrogen flow was 16 GPa.","PeriodicalId":742,"journal":{"name":"Powder Metallurgy and Metal Ceramics","volume":"62 3-4","pages":"164 - 173"},"PeriodicalIF":0.9,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138534419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical and Functional Properties of Composite Coatings with Fine Reinforcements Produced from Galvanic Processing Waste 用电镀锌废渣制备细增强复合涂层的力学性能和功能性能

IF 0.9 4区材料科学

Powder Metallurgy and Metal Ceramics Pub Date : 2023-11-16 DOI: 10.1007/s11106-023-00386-1

D. M. Samchenko, G. A. Bagliuk, G. M. Kochetov, O. V. Lastivka, D. O. Derecha, T. O. Prikhna

{"title":"Mechanical and Functional Properties of Composite Coatings with Fine Reinforcements Produced from Galvanic Processing Waste","authors":"D. M. Samchenko, G. A. Bagliuk, G. M. Kochetov, O. V. Lastivka, D. O. Derecha, T. O. Prikhna","doi":"10.1007/s11106-023-00386-1","DOIUrl":"10.1007/s11106-023-00386-1","url":null,"abstract":"The potential of wastewaters from the galvanic industry treated to remove toxic heavy-metal contaminants for the manufacture of commercial products lies in the development of processes for their reuse. This research addresses the feasibility of employing galvanic waste in the production of powder coatings. Powder waste generated through the resource-saving ferritic method and electroerosion dispersion method is significantly safer for the environment than that generated through reagent methods. Coatings resulting from wastewater treatment exhibit mechanical properties that meet current industry standards. The introduction of 15 wt.% spent polyvalent iron oxide sorbent into paint coatings enhances their mechanical performances. Specifically, the rebound strength increases from 20 to 40 cm/kg and tensile strength from 5 to 7.4 mm, the bending strength decreases from 8 to 5 mm, and the corrosion resistance of the coatings improves by 1.5 times compared to the standard samples. These improvements are attributed to the introduction of chemically and thermally stable crystalline phases possessing ferromagnetic properties into the coatings. As a result, these coatings increase shielding against electromagnetic radiation in the megahertz range by three times compared to the standard coatings. A significant research finding is the potential for reusing ferromagnetic waste from the galvanic industry in specialized materials.","PeriodicalId":742,"journal":{"name":"Powder Metallurgy and Metal Ceramics","volume":"62 3-4","pages":"233 - 240"},"PeriodicalIF":0.9,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138534411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Adsorption of Water Vapors on Magnetite Powders Prepared by Chemical Precipitation and Thermolysis Methods 化学沉淀法和热解法制备的磁铁矿粉末对水蒸气的吸附作用

IF 0.9 4区材料科学

Powder Metallurgy and Metal Ceramics Pub Date : 2023-11-14 DOI: 10.1007/s11106-023-00376-3

A. O. Synytsia, V. S. Zenkov, O. E. Sych, O. I. Khomenko, T. E. Babutina

{"title":"Adsorption of Water Vapors on Magnetite Powders Prepared by Chemical Precipitation and Thermolysis Methods","authors":"A. O. Synytsia, V. S. Zenkov, O. E. Sych, O. I. Khomenko, T. E. Babutina","doi":"10.1007/s11106-023-00376-3","DOIUrl":"10.1007/s11106-023-00376-3","url":null,"abstract":"A comparative study of the morphology and physicochemical properties of magnetite synthesized by chemical precipitation for 5 min, 30 min, and 1 h and by thermolysis in nitrogen and hydrocarbon atmospheres was conducted. Regardless of the synthesis method, duration, and atmosphere, the powders were found to have spherical particles, uniform particle size distribution, and ability to agglomerate. The chemical precipitation method produced powders within a narrower size range, specifically up to 56 nm, in contrast to the thermolysis method, characterized by a particle size of up to 84 nm. Gravimetric analysis of the kinetic laws of water vapor adsorption on the synthesized powders in an air flow with a relative humidity ranging from 60 to 100% showed that the adsorption process was most intensive in the initial stage (within 30 min). The adsorption of water vapors and the process speed were significantly influenced by the synthesis method and duration and by the thermolysis atmosphere. Magnetite produced by chemical precipitation exhibited adsorption properties more than an order of magnitude higher than those of the powders produced by thermolysis. This can be attributed not only to the specific surface area but also to the material’s greater affinity for water molecules. A hydrocarbon atmosphere for thermolysis reduced the adsorption properties of magnetite by half compared to nitrogen. This may be associated not only with the potential passivation or catalytic poisoning of the powder surface but also with the influence of the carbon component on the reduction of pore volume and the promotion of magnetite adsorption capacity for polar molecules of the gaseous water phase.","PeriodicalId":742,"journal":{"name":"Powder Metallurgy and Metal Ceramics","volume":"62 3-4","pages":"133 - 141"},"PeriodicalIF":0.9,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134954538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced Study of Magnetic Properties of Polyvinyl Alcohol-Coated Superparamagnetic Iron Oxide Nanoparticles Below Blocking Temperatures 封闭温度下聚乙烯醇包覆超顺磁性氧化铁纳米粒子磁性的增强研究

IF 1 4区材料科学

Powder Metallurgy and Metal Ceramics Pub Date : 2023-10-20 DOI: 10.1007/s11106-023-00368-3

Bandana Gogoi, Upamanyu Das

{"title":"Enhanced Study of Magnetic Properties of Polyvinyl Alcohol-Coated Superparamagnetic Iron Oxide Nanoparticles Below Blocking Temperatures","authors":"Bandana Gogoi, Upamanyu Das","doi":"10.1007/s11106-023-00368-3","DOIUrl":"10.1007/s11106-023-00368-3","url":null,"abstract":"<div><div>Superparamagnetic iron oxide nanoparticles (SPIONs) coated with the synthetic hydrophilic biocompatible polymer polyvinyl alcohol were synthesized using the aqueous method. Static and dynamic magnetization processes were investigated for surface-modified SPIONs by analyzing the magnetization study at constant and varying magnetic fields. The magnetization on the applied magnetic field (M–H) and the magnetization dependent on temperature (M–T) were investigated. The temperature dependence of the complex susceptibility of SPIONs was investigated by measuring the in-phase (natural) and out-of-phase (imaginary) components of the susceptibility value at a frequency of 10 Hz and a very low magnetizing field. The XRD study shows diffraction peaks consistent with the magnetite (Fe3O4) phase of SPIONPs. FTIR, DSC, and TGA studies confirm the functional groups and stability of the coated nanoparticles. The magnetizing field cycle study at various constant temperatures (10, 100, and 300 K) shows the high magnetization value of polyvinyl alcohol-coated SPIONs with superparamagnetic states at and above 300 K. The effect of interparticle interaction on blocking temperature has been interpreted from FC/ZFC curves drawn at different DC magnetizing field values by varying temperature between 10 and 300 K.</div></div>","PeriodicalId":742,"journal":{"name":"Powder Metallurgy and Metal Ceramics","volume":"62 1-2","pages":"41 - 57"},"PeriodicalIF":1.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71910048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Inhibition Effect of NaHCO3 on the Explosion of Mg–Al Alloy Powder NaHCO3对镁铝合金粉末爆炸的抑制作用

IF 1 4区材料科学

Powder Metallurgy and Metal Ceramics Pub Date : 2023-10-20 DOI: 10.1007/s11106-023-00373-6

Xiangrui Wei, Jing Shi, Yunkuan Zhang, Youning Zhang, Zheng Wang, Yansong Zhang

{"title":"Inhibition Effect of NaHCO3 on the Explosion of Mg–Al Alloy Powder","authors":"Xiangrui Wei, Jing Shi, Yunkuan Zhang, Youning Zhang, Zheng Wang, Yansong Zhang","doi":"10.1007/s11106-023-00373-6","DOIUrl":"10.1007/s11106-023-00373-6","url":null,"abstract":"<div><div>For explosion-proof and effective suppression measures in treating magnesium–aluminum alloy, it is of great importance to study the suppression of Mg–Al alloy dust explosions to prevent explosion disasters. The addition of inert solid substances to combustible dust is a measure aimed at preventing and reducing dust explosions. The explosion characteristics and flame propagation characteristics of Mg–Al alloy powder were studied using the Hartmann tube 20 L spherical explosion experimental system. The mechanism for removing sodium bicarbonate (NaHCO3) during the Mg–Al alloy powder explosion was further studied. The results show that the explosion pressure, the height of the deflagration flame, and the speed at which the flame propagates can be effectively reduced by increasing the percentage of NaHCO3. After the addition of 80% NaHCO3, the flame was suppressed, and the maximum explosion pressure decreased to less than 0.1 MPa, causing a 93% decrease in the maximum flame propagation speed. The process of suppressing NaHCO3 powder on magnesium aluminum alloy dust explosion is relatively complex, starting primarily with physical and chemical suppression. NaHCO3 realizes physical inhibition by reducing ambient temperature and oxygen concentration through the H2O and CO2 generated by decomposition. At the same time, through the cycle of NaO ↔ Na, the transformation from highly active oxygen to low active oxygen is realized. This reduces the activity of the explosive combustion response of Mg–Al alloy powder. At the same time, sodium ions can capture free radicals in explosive responses, reducing the number of free radicals in the reaction system and terminating the combustion reaction chain in advance. The research findings are of great importance for the safety of Mg–Al alloy production.</div></div>","PeriodicalId":742,"journal":{"name":"Powder Metallurgy and Metal Ceramics","volume":"62 1-2","pages":"98 - 110"},"PeriodicalIF":1.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71910049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0