Journal of Korean Powder Metallurgy Institute最新文献

Cryogenic Tensile Behavior of Ferrous Medium-entropy Alloy Additively Manufactured by Laser Powder Bed Fusion 利用激光粉末床熔融技术添加制造的中熵铁合金的低温拉伸行为

Journal of Korean Powder Metallurgy Institute Pub Date : 2024-02-28 DOI: 10.4150/kpmi.2024.31.1.8

Seungyeon Lee, K. Kim, Ji-Hun Yu, Hyoung-Seop Kim, J. Bae, Jeong-Min Park

引用次数: 0

Fabrication of Ti-Mo Core-shell Powder and Sintering Properties for Application as a Sputtering Target 用作溅射靶材的钛钼核壳粉末的制备和烧结性能

Journal of Korean Powder Metallurgy Institute Pub Date : 2024-02-28 DOI: 10.4150/kpmi.2024.31.1.43

Won Hee Lee, C. Park, Heeyeon Kim, Yuncheol Ha, Jongmin Byun, Young Do Kim

{"title":"Fabrication of Ti-Mo Core-shell Powder and Sintering Properties for Application as a Sputtering Target","authors":"Won Hee Lee, C. Park, Heeyeon Kim, Yuncheol Ha, Jongmin Byun, Young Do Kim","doi":"10.4150/kpmi.2024.31.1.43","DOIUrl":"https://doi.org/10.4150/kpmi.2024.31.1.43","url":null,"abstract":"In this study, a core-shell powder and sintered specimens using a mechanically alloyed (MAed) Ti-Mo powder fabricated through high-energy ball-milling are prepared. Analysis of sintering, microstructure, and mechanical properties confirms the applicability of the powder as a sputtering target material. To optimize the MAed Ti-Mo powder milling process, phase and elemental analyses of the powders are performed according to milling time. The results reveal that 20 h of milling time is the most suitable for the manufacturing process. Subsequently, the MAed Ti-Mo powder and MoO 3 powder are milled using a 3-D mixer and heat-treated for hydrogen reduction to manufacture the core-shell powder. The reduced core-shell powder is transformed to sintered specimens through molding and sintering at 1300 and 1400 o C. The sintering properties are analyzed through X-ray diffraction and scanning electron microscopy for phase and porosity analyses. Moreover, the microstructure of the powder is investigated through optical microscopy and electron probe microstructure analysis. The Ti-Mo core-shell sintered specimen is found to possess high density, uniform microstructure, and excellent hardness properties. These results indicate that the Ti-Mo core-shell sintered specimen has excellent sintering properties and is suitable as a sputtering target material.","PeriodicalId":16122,"journal":{"name":"Journal of Korean Powder Metallurgy Institute","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140418332","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}

引用次数: 0

Development of High-strength, High-temperature Nb-Si-Ti Alloys through Mechanical Alloying 通过机械合金化开发高强度高温铌硅钛合金

Journal of Korean Powder Metallurgy Institute Pub Date : 2024-02-28 DOI: 10.4150/kpmi.2024.31.1.30

Jung-Joon Kim, Sang-Min Yoon, Deok-Hyun Han, Jongmin Byun, Young-Kyun Kim

{"title":"Development of High-strength, High-temperature Nb-Si-Ti Alloys through Mechanical Alloying","authors":"Jung-Joon Kim, Sang-Min Yoon, Deok-Hyun Han, Jongmin Byun, Young-Kyun Kim","doi":"10.4150/kpmi.2024.31.1.30","DOIUrl":"https://doi.org/10.4150/kpmi.2024.31.1.30","url":null,"abstract":"The aerospace and power generation industries have an increasing demand for high-temperature, high-strength materials. However, conventional materials typically lack sufficient fracture toughness and oxidation resistance at high temperatures. This study aims to enhance the high-temperature properties of Nb-Si-Ti alloys through ball milling. To analyze the effects of milling time, the progression of alloying is evaluated on the basis of XRD patterns and the microstructure of alloy powders. Spark plasma sintering (SPS) is employed to produce compacts, with thermodynamic modeling assisting in predicting phase fractions and sintering temperature ranges. The changes in the microstructure and variation in the mechanical properties due to the adjustment of the sintering temperature provide insights into the influence of Nb solid solution, Nb5Si3, and crystallite size within the compacts. By investigating the changes in the mechanical properties through strengthening mechanisms, such as precipitation strengthening, solid solution strengthening, and crystallite refinement, this study aims to verify the applicability of Nb-Si-Ti alloys in advanced material systems.","PeriodicalId":16122,"journal":{"name":"Journal of Korean Powder Metallurgy Institute","volume":"16 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140423052","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}

引用次数: 0

Fabrication of Bi2Te2.5Se0.5 by Combining Oxide-reduction and Compressive-forming Process and Its Thermoelectric Properties 结合氧化还原和压缩成形工艺制备 Bi2Te2.5Se0.5 及其热电特性

Journal of Korean Powder Metallurgy Institute Pub Date : 2024-02-28 DOI: 10.4150/kpmi.2024.31.1.50

Young Soo Lim, Gil-Geun Lee

{"title":"Fabrication of Bi2Te2.5Se0.5 by Combining Oxide-reduction and Compressive-forming Process and Its Thermoelectric Properties","authors":"Young Soo Lim, Gil-Geun Lee","doi":"10.4150/kpmi.2024.31.1.50","DOIUrl":"https://doi.org/10.4150/kpmi.2024.31.1.50","url":null,"abstract":"We report the effect of plastic deformation on the thermoelectric properties of n-type Bi 2 Te 2.5 Se 0.5 compounds. N-type Bi 2 Te 2.5 Se 0.5 powders are synthesized by an oxide-reduction process and consolidated via spark-plasma sintering. To explore the effect of plastic deformation on the thermoelectric properties, the sintered bodies are subjected to uniaxial pressure to induce a controlled amount of compressive strains (-0.2, -0.3, and -0.4). The shaping temperature is set using a thermochemical analyzer, and the plastic deformation effect is assessed without altering the material composition through differential scanning calorimetry. This strategy is crucial because the conventional hot-forging process can often lead to alterations in material composition due to the high volatility of chalcogen elements. With increasing compressive strain, the (00l) planes become aligned in the direction perpendicular to the pressure axis. Furthermore, an increase in the carrier concentration is observed upon compressive plastic deformation, i.e ., the donor-like effect of the plastic deformation in n-type Bi 2 Te 2.5 Se 0.5 compounds. Owing to the increased electrical conductivity through the preferred orientation and the donor-like effect, an improved ZT is achieved in n-type Bi 2 Te 2.5 Se 0.5 through the compressive-forming process.","PeriodicalId":16122,"journal":{"name":"Journal of Korean Powder Metallurgy Institute","volume":"35 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140418593","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}

引用次数: 0

Development of Composite-film-based Flexible Energy Harvester using Lead-free BCTZ Piezoelectric Nanomaterials 利用无铅 BCTZ 压电纳米材料开发基于复合薄膜的柔性能量收集器

Journal of Korean Powder Metallurgy Institute Pub Date : 2024-02-28 DOI: 10.4150/kpmi.2024.31.1.16

Gwang Hyeon Kim, Hyeon Jun Park, Bitna Bae, Haksu Jang, Cheol Min Kim, Donghun Lee, Kwi-Il Park

{"title":"Development of Composite-film-based Flexible Energy Harvester using Lead-free BCTZ Piezoelectric Nanomaterials","authors":"Gwang Hyeon Kim, Hyeon Jun Park, Bitna Bae, Haksu Jang, Cheol Min Kim, Donghun Lee, Kwi-Il Park","doi":"10.4150/kpmi.2024.31.1.16","DOIUrl":"https://doi.org/10.4150/kpmi.2024.31.1.16","url":null,"abstract":"Composite-based piezoelectric devices are extensively studied to develop sustainable power supply and selfpowered devices owing to their excellent mechanical durability and output performance. In this study, we design a leadfree piezoelectric nanocomposite utilizing (Ba0.85Ca0.15)(Ti0.9Zr0.1)O3 (BCTZ) nanomaterials for realizing highly flexible energy harvesters. To improve the output performance of the devices, we incorporate porous BCTZ nanowires (NWs) into the nanoparticle (NP)-based piezoelectric nanocomposite. BCTZ NPs and NWs are synthesized through the solidstate reaction and sol-gel-based electrospinning, respectively; subsequently, they are dispersed inside a polyimide matrix. The output performance of the energy harvesters is measured using an optimized measurement system during repetitive mechanical deformation by varying the composition of the NPs and NWs. A nanocomposite-based energy harvester with 4:1 weight ratio generates the maximum open-circuit voltage and short-circuit current of 0.83 V and 0.28 A, respectively. In this study, self-powered devices are constructed with enhanced output performance by using piezoelectric energy harvesting for application in flexible and wearable devices.","PeriodicalId":16122,"journal":{"name":"Journal of Korean Powder Metallurgy Institute","volume":"57 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140419786","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}

引用次数: 0

Effect of Abnormal Grain Growth on Ionic Conductivity in LATP 异常晶粒生长对 LATP 离子传导性的影响

Journal of Korean Powder Metallurgy Institute Pub Date : 2024-02-28 DOI: 10.4150/kpmi.2024.31.1.23

Hyungik Choi, Yoonsoo Han

引用次数: 0

Effect of Tool Shape and Insertion Depth on Joining Properties in Friction Stir Spot Welding of Aluminum Alloy/high-strength Steel Sheets 工具形状和插入深度对铝合金/高强度钢板摩擦搅拌点焊接合性能的影响

Journal of Korean Powder Metallurgy Institute Pub Date : 2024-02-28 DOI: 10.4150/kpmi.2024.31.1.37

Su-Ho An, Young-Keun Jeong

{"title":"Effect of Tool Shape and Insertion Depth on Joining Properties in Friction Stir Spot Welding of Aluminum Alloy/high-strength Steel Sheets","authors":"Su-Ho An, Young-Keun Jeong","doi":"10.4150/kpmi.2024.31.1.37","DOIUrl":"https://doi.org/10.4150/kpmi.2024.31.1.37","url":null,"abstract":"Friction stir spot welding (FSSW) is a solid-state joining process and a rapidly growing dissimilar material welding technology for joining metallic alloys in the automotive industry. Welding tool shape and process conditions must be appropriately controlled to obtain high bonding characteristics. In this study, FSSW is performed on dissimilar materials AA5052-H32 aluminum alloy sheet and SPRC440 steel sheet, and the influence of the shape of joining tool and tool insertion depth during joining is investigated. A new intermetallic compound is produced at the aluminum and steel sheets joint. When the insertion depth of the tool is insufficient, the intermetallic compound between the two sheets did not form uniformly. As the insertion depth increased, the intermetallic compound layer become uniform and continuous. The joint specimen shows higher values of tensile shear load as the diameter and insertion depth of the tool increase. This shows that the uniform formation of the intermetallic compound strengthens the bonding force between the joining specimens and increases the tensile shear load.","PeriodicalId":16122,"journal":{"name":"Journal of Korean Powder Metallurgy Institute","volume":"306 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140417912","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}

引用次数: 0

Research Trends in Electromagnetic Shielding using MXene-based Composite Materials 使用 MXene 基复合材料的电磁屏蔽研究趋势

Journal of Korean Powder Metallurgy Institute Pub Date : 2024-02-28 DOI: 10.4150/kpmi.2024.31.1.57

Siyeon Kim, Jongmin Byun

引用次数: 0

Fabrication and Sintering Behavior Analysis of Molybdenum-tungsten Nanopowders by Pechini Process 用 Pechini 工艺制作钼钨纳米粉体及其烧结特性分析

Journal of Korean Powder Metallurgy Institute Pub Date : 2023-10-30 DOI: 10.4150/kpmi.2023.30.5.436

Suyeon Kim, Taehyun Kwon, Seulgi Kim, Dongju Lee

引用次数: 0

Formation of Phases and Mechanical Properties of YSZ-Based Thermal Barrier Coating Materials Doped with Rare Earth Oxides 掺杂稀土氧化物的 YSZ 基隔热涂层材料的成相和力学性能

Journal of Korean Powder Metallurgy Institute Pub Date : 2023-10-30 DOI: 10.4150/kpmi.2023.30.5.402

Yong Seok Choi, Gye-Won Lee, Sahn Nahm, Yoon-Suk Oh

引用次数: 0