Article
Materials Science, Ceramics
Xiulan He, Tai Jin, Shilong Wang, Ling Li
Summary: Aluminum nitride ceramics were prepared through aqueous gelcasting and pressureless sintering using Y2O3 as additives and curdlan as the gel system. The effects of curdlan content, solid content, Y2O3 content, and sintering soaking time on the microstructure and properties of the ceramics were investigated. Suitable curdlan and solid content contributed to uniform microstructures and high flexural strength of the green bodies. Increasing Y2O3 content and soaking time resulted in enhanced relative density and flexural strength of the sintered bodies. The optimized gelcasting process parameters, Y2O3 content, and soaking time improved the mechanical and thermal properties of the sintered bodies. The nontoxic gelcasting system showed potential for the fabrication of complex-shaped ceramics.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
M. Alejandra Mazo, Juan Rubio
Summary: Highly densified SiOC/spodumene composites with low CTE were achieved by selecting the appropriate spark plasma sintering temperature. Spodumene, a cheap and readily available lithium aluminium silicate mineral, was proposed for the first time as a meltable/active filler for SiOC-derived composites due to its powerful fluxing properties and very low CTE.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Zemin Wang, Zhimeng Tang, Lei Xu, Zhaohui Han, Jianhua Liu, Libo Zhang
Summary: The effect of graphite volume fraction on the thermal conductivity and coefficient of thermal expansion of graphite/copper composites was investigated. The results showed that a lower volume fraction led to higher thermal properties. The effect of thermal cycling on the thermal properties of metal matrix composites was also explored, revealing a staged decrease of thermal conductivity and a gradual increase in coefficient of thermal expansion.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Electrical & Electronic
Zhimeng Tang, Lei Xu, Zemin Wang, Zhaohui Han, Jianhua Liu
Summary: By using rapid microwave sintering and adding titanium, the performance of graphite/copper composites can be significantly improved, enhancing their interface bonding and increasing the density, hardness, and thermal conductivity of the composites.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Physics, Applied
Sevil Sarikurt, Yusuf Zuntu Abdullahi, Engin Durgun, Fatih Ersan
Summary: This study investigates the thermal expansion coefficients of group III-Nitride monolayers with temperature, revealing high negative values below room temperature and a convergence to zero for certain monolayers above room temperature. The highest contribution to negative thermal expansion comes from the ZA phonon mode. These findings are important for the design of nanoscale heat devices.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
R. Vignesh Babu, S. Kanagaraj
Summary: The performance of copper can be enhanced by the addition of carbon nanotubes as reinforcement, resulting in Cu/CNT composite materials with improved properties, particularly in terms of thermal conductivity. Through a special processing technique, such as molecular level mixing, cold isostatic pressing, and microwave sintering, the composites exhibit superior characteristics compared to conventional processing methods, showcasing promising potential for industrial applications.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Multidisciplinary Sciences
Michal Delkowski, Christopher T. G. Smith, Jose V. Anguita, S. Ravi P. Silva
Summary: Future space travel requires lightweight and robust structural materials that can withstand extreme conditions and multiple entries into orbit. Current inorganic materials cannot meet these requirements. Carbon fiber reinforced polymers (CFRPs), although highly stable, have limitations due to environmental instabilities and electrostatic discharge. To improve space travel and structural engineering, a more robust and improved CFRP is needed. In this study, a superlattice nano-barrier-enhanced CFRP with a density of approximately 3.18 g/cm³ is presented. The composite exhibits enhanced radiation resistance and electrical conductivity, while maintaining ultra-dimensional stability even after temperature cycles.
Article
Materials Science, Multidisciplinary
Dian Song, Junchen Huang, Bing Yang, Siwen Tang, Youming Chen, Yun Ou, Wuxing Zhou, Qian Liu
Summary: A reinforcement phase macrostructure design was used to improve the thermal conductivity of composites in both the X-Y and Z directions. Copper matrix composites with a radial graphite film skeleton were fabricated using fast hot pressing technology. The radial structure design proved to be an effective strategy, as the composites showed a 10 times higher thermal conductivity in the Z-direction compared to laminated composites, while maintaining a high thermal conductivity in the X-Y direction. The composites displayed a thermal conductivity of 778 W/mK in the X-Y direction and 287 W/mK in the Z direction when the graphite films were at a 20% volume fraction. These composites have the potential to be used as thermal management materials.
Article
Materials Science, Ceramics
Somnath Mandal, James G. Hemrick, Manoj K. Mahapatra
Summary: Considering the toxicity of Cr6+ in chrome-based refractories, the development of chrome-free Mg2TiO4 phase is being explored for its improved hot strength and resistance to thermal shock and slag corrosion. The use of industrial anatase instead of rutile as a precursor resulted in lower expansion and earlier reaction. Sintering at 1,600 degrees C produced an aggregate with 0% porosity and higher bulk density when anatase was used. The replacement of rutile by anatase also eliminated the undesirable MgTiO3 phase.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Engineering, Multidisciplinary
Xiao Ning, Qiao YongQiang, Shi NaiKe, Song YuZhu, Deng ShiQing, Chen Jun
Summary: The study presents a method of achieving high thermal conductivity and low thermal expansion by designing and synthesizing ScF3@Cu core-shell composites with a spatially continuous copper network structure. This approach is different from conventional mixed composites and shows high thermal conductivity and low thermal expansion properties simultaneously in the ScF3@Cu-40 core-shell composite.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2021)
Article
Chemistry, Physical
Luciano M. Rodrigues, Bojan A. Marinkovic
Summary: This study found that the addition of fused silica in different volume percentages to Alumix-231 alloy can significantly reduce its thermal expansion coefficient, making it more suitable for certain applications. Additionally, the density and hardness of the composite material were not heavily impacted.
Article
Chemistry, Physical
Yu Jia, Han Zhang, Beixue Yang, Jun Zhang
Summary: A thermally conductive composite of HIPS/Cu alloy with constant thermal conductivity in the range of -20 to 80 degrees C was successfully prepared. The positive temperature-dependence of thermal conductivity in Cu alloy counters the negative contribution from thermal expansion of the composite. This material can be used in high temperature heat dissipation devices such as chemical heat exchangers and provides accurate data for chemical production heat calculation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Fei Sun, Hongji Lin, Jianan Fu, Zhen Li, Feng Luo, Bei Wang, Wenqing Ruan, Shuai Ren, Zhenxuan Zhang, Xiong Liang, Jiang Ma, Jun Shen
Summary: The study developed a method for preparing metallic glass matrix composites with precise control over their thermal expansion properties. By utilizing the unique thermoplasticity, mixtures with different thermal expansion properties were successfully bonded to metallic glasses. The prepared composites achieve continuous regulation of their coefficient of thermal expansion with high precision and can even exhibit nearly zero thermal expansion properties.
APPLIED MATERIALS TODAY
(2022)
Article
Materials Science, Ceramics
Somnath Mandal, James G. Hemrick, Manoj K. Mahapatra
Summary: ZnAl2O4 has been found to enhance the thermomechanical properties and slag corrosion resistance of refractory castables. However, the generation of pores and deleterious expansion during its in situ formation can limit its amount in refractory compositions. This study presents a comprehensive dilatometric investigation, identifying the optimal raw materials and processing conditions. It was found that the preformed ZnAl2O4 refractory aggregates synthesized from industrial ZnO and reactive Al2O3 through two-stage firing exhibited 0% open porosity. The ZnAl2O4 powder calcined at 1050°C also showed good sinterability and a similar thermal expansion coefficient to other commonly used refractory materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Thermodynamics
Annu Kumar Lakshya, Himirkanti Sarkar, Faiz Ali, Anirban Chowdhury
Summary: In this study, the effect of crystal orientation on the thermal conductivity and thermal expansion coefficient of fluorite structured ceramic La2Ce2O7 was investigated. The results showed that crystal orientation had no significant influence on these properties, revealing a fundamental difference between electron conduction and thermal conduction via phonons.
THERMOCHIMICA ACTA
(2023)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)