Ceramics-Switzerland最新文献_第2页

Dynamic Extrusion Control in Spot Deposition Modeling for Porous 3D Clay Structures 多孔三维粘土结构点沉积建模中的动态挤出控制

Ceramics-Switzerland Pub Date : 2023-10-06 DOI: 10.3390/ceramics6040124

Vesela Tabakova, Christina Klug, Thomas H. Schmitz

引用次数: 0

Frequency Characteristics of High Strain Rate Compressions of Cf-MWCNTs/SiC Composites Cf-MWCNTs/SiC复合材料高应变速率压缩频率特性研究

Ceramics-Switzerland Pub Date : 2023-10-05 DOI: 10.3390/ceramics6040122

Kun Luan, Chen Ming, Xiaomeng Fang, Jianjun Liu

{"title":"Frequency Characteristics of High Strain Rate Compressions of Cf-MWCNTs/SiC Composites","authors":"Kun Luan, Chen Ming, Xiaomeng Fang, Jianjun Liu","doi":"10.3390/ceramics6040122","DOIUrl":"https://doi.org/10.3390/ceramics6040122","url":null,"abstract":"The incorporation of ductile reinforcements into ceramics helps restrain crack deflection, which can enhance ceramics’ toughness and overcome the matrix’s brittleness. In this paper, we produced a ceramic composite reinforced by carbon fibers coated by multi-wall carbon nanotubes (shortened by Cf-MWCNT/SiC composites) for enhanced impact resistance at a high strain rate that commonly occurs in composite materials used in astronautics, marine, and other engineering fields. The fabrication process involves growing multi-wall carbon nanotubes (MWCNTs) on a carbon fiber woven fabric (Cf) to create the fibril/fabric hybrid reinforcement. It is then impregnated by polymer solution (precursor of the ceramics), forming composites after the pyrolysis process, known as the liquid polymer infiltration and pyrolysis (PIP) technique. To assess the impact resistance of the Cf-MWCNT/SiC under high-strain rate compressions, the split Hopkinson pressure bar (SHPB) technique is employed. Since the failure behavior of the Cf-MWCNT/SiC composites in the absence of the ductile phase is not well understood, the study employs the Hilbert–Huang transform (HHT) to analyze the stress–time curves obtained from the SHPB experiments. By applying the HHT, we obtained the frequency–time spectrum and the marginal Hilbert spectrum of the stress signals. These analyses reveal the frequency characteristics of the Cf-MWCNT/SiC composite and provide insights into the relationship between transformed signal frequency and fracture behavior. By understanding the dynamic fracture behavior and frequency response of the Cf-MWCNT/SiC, it becomes possible to enhance its impact resistance and tailor its performance for specific protective requirements. Therefore, the findings of this study can guide the future design and optimization of Cf-MWCNT/SiC structures for various protective applications, such as body armor, civil structures, and protections for vehicles and aircraft.","PeriodicalId":33263,"journal":{"name":"Ceramics-Switzerland","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135435017","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

Chemical Compositions of Chinese Glazed Tiles from an Imperial Mausoleum of the Liao Dynasty 辽代皇陵琉璃瓦的化学成分

Ceramics-Switzerland Pub Date : 2023-10-05 DOI: 10.3390/ceramics6040123

Lan Zhao, Xiongfei Wan, Baoqiang Kang, He Li

{"title":"Chemical Compositions of Chinese Glazed Tiles from an Imperial Mausoleum of the Liao Dynasty","authors":"Lan Zhao, Xiongfei Wan, Baoqiang Kang, He Li","doi":"10.3390/ceramics6040123","DOIUrl":"https://doi.org/10.3390/ceramics6040123","url":null,"abstract":"Glazed tiles are characteristic architectural ceramics traditionally used in ancient Chinese royal buildings. Studies on their chemical compositions have provided valuable information regarding their compositional classifications and the provenances of their raw materials. Existing studies have mainly focused on the Yuan dynasty (1271–1368 AD) or later. Research on earlier ages is limited because of a lack of samples. In this study, we used an energy-dispersive X-ray fluorescence spectrometer to analyze the chemical compositions of 18 glazed tiles unearthed from an imperial mausoleum (the Xinli site) from the Liao dynasty (969–982 AD). The glazes of the tiles had a SiO2–Al2O3–PbO ternary oxidic system and the bodies of the tiles had a SiO2–Al2O3 binary oxidic system. Certain compositional differences were observed among the samples with different types of decorations. Compared with samples from the Yuan dynasty and later periods, the Xinli samples had higher SiO2 and Al2O3 contents and lower PbO and CuO contents in the tile glazes. The tile bodies of the Xinli samples had compositions similar to those of tile bodies from the Qing dynasty (1616–1912 AD). We speculated that the Xinli samples with different decorations came from different kiln sites.","PeriodicalId":33263,"journal":{"name":"Ceramics-Switzerland","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135480892","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

Microstructure, Mechanical and Thermal Properties of ZTA/Al2TiO5 Ceramic Composites ZTA/Al2TiO5陶瓷复合材料的显微组织、力学和热性能

Ceramics-Switzerland Pub Date : 2023-10-04 DOI: 10.3390/ceramics6040121

A. M. Hassan, Hamada Elsayed, M. Awaad, A. M. Saleh, S. M. Naga

引用次数: 0

Rare-Earth Doped Gd3−xRExFe5O12 (RE = Y, Nd, Sm, and Dy) Garnet: Structural, Magnetic, Magnetocaloric, and DFT Study 稀土掺杂Gd3−xRExFe5O12 (RE = Y, Nd, Sm, and Dy)石榴石:结构、磁性、磁热学和DFT研究

Ceramics-Switzerland Pub Date : 2023-09-22 DOI: 10.3390/ceramics6040120

Dipesh Neupane, Noah Kramer, Romakanta Bhattarai, Christopher Hanley, Arjun K. Pathak, Xiao Shen, Sunil Karna, Sanjay R. Mishra

{"title":"Rare-Earth Doped Gd3−xRExFe5O12 (RE = Y, Nd, Sm, and Dy) Garnet: Structural, Magnetic, Magnetocaloric, and DFT Study","authors":"Dipesh Neupane, Noah Kramer, Romakanta Bhattarai, Christopher Hanley, Arjun K. Pathak, Xiao Shen, Sunil Karna, Sanjay R. Mishra","doi":"10.3390/ceramics6040120","DOIUrl":"https://doi.org/10.3390/ceramics6040120","url":null,"abstract":"The study reports the influence of rare-earth ion doping on the structural, magnetic, and magnetocaloric properties of ferrimagnetic Gd3−xRExFe5O12 (RE = Y, Nd, Sm, and Dy, x = 0.0, 0.25, 0.50, and 0.75) garnet compound prepared via facile autocombustion method followed by annealing in air. X-Ray diffraction (XRD) data analysis confirmed the presence of a single-phase garnet. The compound’s lattice parameters and cell volume varied according to differences in ionic radii of the doped rare-earth ions. The RE3+ substitution changed the site-to-site bond lengths and bond angles, affecting the magnetic interaction between site ions. Magnetization measurements for all RE3+-doped samples demonstrated paramagnetic behavior at room temperature and soft-ferrimagnetic behavior at 5 K. The isothermal magnetic entropy changes (−ΔSM) were derived from the magnetic isotherm curves, M vs. T, in a field up to 3 T in the Gd3−xRExFe5O12 sample. The maximum magnetic entropy change (−∆SMmax) increased with Dy3+ and Sm3+substitution and decreased for Nd3+ and Y3+ substitution with x content. The Dy3+-doped Gd2.25Dy0.75Fe5O12 sample showed −∆SMmax~2.03 Jkg−1K−1, which is ~7% higher than that of Gd3Fe5O12 (1.91 Jkg−1K−1). A first-principal density function theory (DFT) technique was used to shed light on observed properties. The study shows that the magnetic moments of the doped rare-earths ions play a vital role in tuning the magnetocaloric properties of the garnet compound.","PeriodicalId":33263,"journal":{"name":"Ceramics-Switzerland","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136096681","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

Characterization and Heat Transfer Assessment of CuO-Based Nanofluid Prepared through a Green Synthesis Process 绿色合成法制备铜基纳米流体的表征及传热性能评价

Ceramics-Switzerland Pub Date : 2023-09-22 DOI: 10.3390/ceramics6040119

Suresh Kumar Shanmugam, Ajithram Arivendan, Samy Govindan Selvamani, Thangaraju Dheivasigamani, Thirumalai Kumaran Sundaresan, Saood Ali

{"title":"Characterization and Heat Transfer Assessment of CuO-Based Nanofluid Prepared through a Green Synthesis Process","authors":"Suresh Kumar Shanmugam, Ajithram Arivendan, Samy Govindan Selvamani, Thangaraju Dheivasigamani, Thirumalai Kumaran Sundaresan, Saood Ali","doi":"10.3390/ceramics6040119","DOIUrl":"https://doi.org/10.3390/ceramics6040119","url":null,"abstract":"The manufacturing of copper oxide (CuO) nanoparticles has been accomplished utilizing a green technique that relies on biologically reliable mechanisms. Aqueous solutions of copper nitrate and Ixora Coccinea leaf extract are used in an environmentally safe process for creating CuO nanoparticles. The characterization of the synthesized CuO nanoparticles involves the utilization of techniques such as X-ray diffractometry (XRD), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and thermogravimetricanalysis (TGA). CuO nanoparticles are confirmed by XRD and FTIR peak results. When the particles are measured, they range between 93.75 nm and 98.16 nm, respectively. The produced CuO nanoparticles are used to prepare the nanofluid. While conventional water exhibits a 3 °C temperature difference, nanofluid achieves a considerable temperature differenceof 7 °C. As a result, it is clear that the nanofluid performs better at dispersing heat into the environment. The experiment’s overall findings support the possibility of ecologically friendly, green-synthesized CuO nanoparticle-induced nanofluid as an effective heattransfer fluid that can be applied to heattransfer systems.","PeriodicalId":33263,"journal":{"name":"Ceramics-Switzerland","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136098856","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

Dielectric Properties of Compacts Sintered after High-Pressure Forming of Lithium Fluoride 高压成形氟化锂烧结体的介电性能

Ceramics-Switzerland Pub Date : 2023-09-22 DOI: 10.3390/ceramics6040118

Pavel Ctibor, Libor Straka, Josef Sedláček, František Lukáč

引用次数: 0

Compositionally Disordered Ceramic (Gd,Y,Tb,Ce)3Al2Ga3O12 Phosphor for an Effective Conversion of Isotopes’ Ionizing Radiation to Light 成分无序陶瓷(Gd,Y,Tb,Ce)3Al2Ga3O12荧光粉用于同位素电离辐射到光的有效转换

Ceramics-Switzerland Pub Date : 2023-09-21 DOI: 10.3390/ceramics6030117

Mikhail V. Korzhik, Petr V. Karpyuk, Aliaksei G. Bondarau, Daria E. Lelecova, Vitaly A. Mechinsky, Vladimir Pustovarov, Vasilii Retivov, Valentina G. Smyslova, Dmitry Tavrunov, Denis N. Yanushevich

引用次数: 0

Metal Halide Perovskite Light-Emitting Transistor with Tunable Emission Based on Electrically Doped Semiconductor Nanocrystal-Based Microcavities 基于电掺杂半导体纳米晶微腔的可调谐发射金属卤化物钙钛矿发光晶体管

Ceramics-Switzerland Pub Date : 2023-09-11 DOI: 10.3390/ceramics6030116

Francesco Scotognella

引用次数: 0

Analytical Model of Deformation of a Functionally Graded Ceramic Coating under Local Load 局部载荷作用下功能梯度陶瓷涂层变形解析模型

IF 2.8

Ceramics-Switzerland Pub Date : 2023-09-07 DOI: 10.3390/ceramics6030115

I. Shatskyi, M. Makoviichuk, L. Ropyak, A. Velychkovych

引用次数: 0