Journal of Materiomics
·
2020
·
IF 5.797
Min Sun,Guowu Tang,Bowen Huang,Zhongjia Chen,Yu-Jun Zhao,Hanfu Wang,Ziwen Zhao,Dongdan Chen,Qi Qian,Zhongmin Yang
Bismuth telluride (Bi 2 Te 3 ) has attracted much attention in the field of thermoelectrics since it is one kind of commercial room-temperature thermoelectric material. Herein three kinds of Bi 2 Te 3 thermoelectric fibers with internal tensile stress are fabricated utilizing an optical fiber template method. The effects of internal stress on the microstructure and the electrical transportation of Bi 2 Te 3 thermoelectric fibers are investigated. The Bi 2 Te 3 cores in the fibers are highly crystalline and possess a tensile nanosheet structure with preferential orientation as evidenced by X-ray diffraction and Raman studies. Tensile stress can enhance electrical properties of the fibers. And a paper cup generator covered with 20 pieces of optimized fibers provides a μW-level output power. It is inferred that tensile stress tuning can be an effective tool for the material optimization of thermoelectric performance.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
AIP Advances
·
2018
·Vol. 8
·期 9
·
IF 1.653
Xiao Maohua,Chen Jingwen,Kang Jingjing,Chen Ke,Wu Dan,Gao Nong
In order to study the effects of different sintering processes on the properties of the alloy, including the microstructure, hardness, friction and wear properties of the alloy, the optimum sintering method and process parameters were selected. A series of FeAlCoCrNiTi0.5 high-entropy alloy blocks were prepared by mechanical alloying using inert alloy sintering technology. XRD pattern showed that when the sintering temperature was 1000°C and the holding time was 3h, the phase structure would be a simple body-centered cubic BCC2 phase and a face-centered cubic FCC phase. SEM observation showed that the microstructure is denser, and the grain refinement of the high entropy alloy is remarkably better. The evaluation of hardness, friction and wear properties showed that the high-entropy alloy had the best overall performance.
研究领域:
材料科学
·
力学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Haoran Li,Yan Liu,JinJing Yang,Ming Yuan,Anle Sun,Tiesong Lin,Xuejian Liu,Zhengren Huang
A new La 2 O 3 -doped Y 2 O 3 crucible materials was fabricated and evaluated by TiAl alloys melting test. Microstructure and properties of the La 2 O 3 -doped Y 2 O 3 ceramics were systemically investigated. In addition, interfacial reaction mechanism of the La 2 O 3 -doped Y 2 O 3 crucible materials and TiAl alloys, together with oxygen content of TiAl alloys were discussed. Solid solution of La 3+ in the crystal lattice of Y 2 O 3 significantly improved sintering properties of the La 2 O 3 -doped Y 2 O 3 crucible materials and decreased the open porosity. Compared with pure Y 2 O 3 , when adding 15 wt% La 2 O 3 , the open porosity and strength retention ration after thermal shock test of the La 2 O 3 -doped Y 2 O 3 crucible materials changed from 10.8% to 3.9% and from 64% to 78%, respectively. The interfacial reaction between La 2 O 3 -doped Y 2 O 3 crucible materials and TiAl alloys belongs to physical dissolution, and no reaction products were found during the melting of TiAl alloys. When using the 15 wt% La 2 O 3 -doped Y 2 O 3 crucible materials to melt TiAl alloys, oxygen content of the TiAl ingot declined to 530 ppm, which was only one fourth of that using pure Y 2 O 3 materials.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2022
·
IF 4.804
Xiao-Chun Deng,He Zhang,Guo-Hua Zhang
Combining spray drying and in-situ synthesized technology, WC-10Co cemented carbides with uniform composition was prepared by vacuum sintering to investigate the effects of different CeO 2 contents (0 wt%, 0.5 wt%, 1 wt%, 2 wt%, 4 wt%) as well as co-doping with CeO 2 and VC on the microstructure and mechanical properties . With increasing CeO 2 addition from 0 wt% to 0.5 wt%, the WC grain size decreased from 0.79 ± 0.35 μm to 0.62 ± 0.24 μm. The hardness, fracture toughness and transverse rupture strength (TRS) of the alloy with 0.5 wt% CeO 2 all reached the maximum values of 1752 ± 28 HV 30 , 18.50 ± 0.35 MPa·m 1/2 and 2245 ± 35 MPa, respectively, which indicated that the mechanical properties of cemented carbide could be simultaneously improved by adding 0.5 wt% CeO 2 to refine the WC grains. However, as the CeO 2 content increased to 4 wt%, the hardness gradually decreased, while the fracture and TRS all slightly decreased first and then tended to be stable. Moreover, the corrosion resistance of alloys first increased and then decreased with the increase of CeO 2 content. The 0.5 wt% CeO 2 alloy had the best corrosion resistance. After adding 0.5 wt% VC, the grain size of alloys became smaller and distribution of Co binder was more uniform. Compared to the samples with only added CeO 2 , the alloy with co-addition of 0.5 wt% CeO 2 and 0.5 wt% VC exhibited the best comprehensive mechanical properties. The hardness, fracture toughness and TRS of the alloy with co-addition of 0.5 wt% CeO 2 and 0.5 wt% VC were 1987 ± 44 HV 30 , 16.10 ± 0.34 MPa·m 1/2 and 2023 ± 78 MPa, respectively.
研究领域:
材料科学
·
冶金学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2021
·
IF 5.985
Xiaodong Xu,Lujuan Li,Seyed Mohsen Seraji,Lei Liu,Zhen Jiang,Zhiguang Xu,Xin Li,Sheng Zhao,Hao Wang,Pingan Song
Spider silk-inspired hydrogen-bond (H-bond) cross-linking has recently been shown to enable polymers, e.g., poly(vinyl alcohol) (PVA), to achieve high strength in combination with large ductility and great toughness by adding small H-bond cross-linkers. Unfortunately, the correlation of H-bond cross-linking to the microstructure and mechanical performances of the resultant polymers remains unclear. Herein, we prepare strong and tough nanostructured PVA composites with inositol (IN) molecules as cross-linkers. The addition of 1.0 wt % of IN increases the yield strength (σy) of PVA up to 148 MPa (by ∼31%), in combination with appreciable increases in the break strain (by 250%) and toughness (by 3.6-fold) because of dynamic physical cross-linking and crystalline grain refinement. We show that there exists a close but simple correlation between the H-bond cross-linking density (ne) and σy, the chain movement (e.g., glass transition temperature (Tg), relaxation activation energy (Ea)) and the crystalline grain size (L), namely, σy ∝ ne, Tg, Ea, and 1/L. This work casts light on the governing effect of H-bonding cross-linking on the microstructure and mechanical properties of PVA and unveils its correlation to mechanical properties, chain dynamics, and crystallization for the first time. These exciting findings open up many new opportunities for creating strong, tough, and ductile polymeric materials.
研究领域:
材料科学
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生物仿生学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 10
·5723-5734
·
IF 3.9
Yi Zhong,Yun Wang,Zhenliang Yang,Bingqing Li,Jingkun Xu,Zhiyi Wang,Liang Xie,Limei Duan,Fengyun Hu,Mingfu Chu,Rui Gao,Pengcheng Zhang,Bin Bai
In this work, the sintering kinetics of pure UO 2 and 0.5 wt.%MnO-doped UO 2 was studied by a high-temperature dilatometer heated up to 1500°C. In addition, the sintering behavior of pure UO 2 and 0.5 wt.%MnO-doped UO 2 was studied by pressureless sintering technique. The results showed that MnO doping enhanced the grain boundary diffusion of UO 2 , which can effectively decrease the densification temperature and promote grain growth. The sintering temperature of UO 2 was significantly reduced by about 200°C with the addition of 0.5 wt.%MnO. The microscopic morphology studies showed that there were still fine particles agglomerated, forming sintered spheres in the matrix even if no severe agglomeration and bimodal size distribution were observed in raw UO 2 powder. The microstructure evolution of the sintered sphere and UO 2 matrix during the densification process was studied by isothermal sintering. Finally, the present analyses indicated that the densification of UO 2 matrix can be accelerated by adding MnO or increasing the sintering temperature, thus improving the densification inhomogeneity of UO 2 matrix.
研究领域:
材料科学
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核工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Yang Liu,Xiaobei Cheng,Yuchen Ya,Bowen Wang,Pu Zhang,Kai Zhang,Yishu Xu
PODE 3 , with the molecular formula of CH 3 O(CH 2 O) 3 CH 3 , is considered a highly competitive alternative fuel due to the absence of C C bond and its high oxygen content, and have been shown to significantly reduce soot emission when applied as a diesel fuel additive. However, the effect of PODE 3 addition on the oxidation reactivity of soot generated in the flame remains unclear which is of great importance for the optimal design of the post-treatment devices during its application. In this work, the impact of PODE 3 (0 %, 10 %, and 20 % by volumetric fraction) addition on the oxidation reactivity of soot at different maturity and oxidation degrees in n -heptane/toluene co-flow diffusion flames was specially investigated combining information on thermogravimetric analysis, high-resolution transmission electron microscope, and Raman spectroscopy. Results showed that PODE 3 substitution significantly shrank soot generation region, and increased the flame temperatures before height above burner (HAB) < 45 mm. The addition of PODE 3 improved the soot oxidation reactivity, which had a strong ability to hinder the growth of the microcrystalline carbon layers and resulted in a high content of amorphous carbon in soot particles. Specifically, it had more significant impacts on the soot in the oxidation stage than the surface growth stage. These can be explained that with PODE 3 addition, on the one hand, the “reliable carbon atom” for soot formation is significantly reduced and the amount of oxidizing species is increased, resulting in a smaller particle size and a higher content of disordered and amorphous carbon in soot particles. On the other hand, the flame temperatures increased where HAB < 45 mm, which would promote the soot formation reactions. The combined effects of these factors make PODE 3 have more significant inhibitory impacts in reactivity of soot sampled at oxidation stage than that at surface growth stage. Therefore, the impact of PODE 3 addition on soot nanostructures and oxidation reactivity is not only reflected in its chemical effect but also in temperature effect.
研究领域:
燃烧学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD SCIENCE
·
2023
·Vol. 88
·期 3
·977-987
·
IF 3.9
Wenfu Hou,Yile Lin,Yujie Zhang,Tingting Liu,Juan Du,Yang Yi,Hongxun Wang
This study investigated the effect of 0.8% (m/v) kojic acid treatment on changes in the microstructure and myofibrillar protein of duck meat covered with oxygen-permeable polyvinylchloride (PVC) film (9 ± 0.5 µM) during superchilled storage (−1.65 ± 0.5°C). The superchilled samples exhibited wider gaps between muscle fibers at 5 weeks storage compared with kojic acid–treated groups. Based on the variation of water status, the water-holding capacity decreased significantly ( p < 0.05), and bound water and immobilized water were gradually converted into free water during superchilled storage. For kojic acid–treated samples, however, no major changes were observed with respect to muscle structure, water status, and protein degradation at 6 weeks. The 0.8% (m/v) kojic acid treatment increased the water-holding capacity, reduced carbonyl content and protein degradation, and decreased the α-helix contents loss of myofibrillar proteins. Kojic acid treatment effectively protected myofibrillar protein structure from being destroyed during superchilled storage, suggesting that this method was a good way to reduce protein oxidation and prolonged its shelf life.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ruichong Chen,Hao Guo,Zhangyi Huang,Haomin Wang,Jianqi Qi,Mao Zhou,Wei Feng,Tiecheng Lu
Li 4 Si 1–x Ti x O 4 ceramic solid solution was considered as a promising tritium breeding material for fusion reactor blanket. In this work, the effects of the sintering atmosphere on the phase composition, microstructure, and mechanical properties of Li 4 Si 0.7 Ti 0.3 O 4 ceramic pebbles were investigated for the first time, aiming to explore the optimal sintering atmosphere for this solid solution. The results show that compared with air and argon atmosphere, the negative pressure of vacuum atmosphere was more favorable for Ti to enter the Li 4 SiO 4 crystal structure as a substitute for Si atom to form a solid solution. More importantly, sintering in argon-vacuum atmosphere can ensure the formation of solid solution while fully exerting the liquid phase sintering effect. The crushing load of the Li 4 Si 0.7 Ti 0.3 O 4 ceramic pebbles sintered at 800 °C in argon-vacuum atmosphere reaches 30.3 ± 3.2 N. In general, the appropriate sintering atmosphere was of great significance for obtaining Li 4 Si 0.7 Ti 0.3 O 4 solid solution to meet the performance requirements of tritium breeding blanket.
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Yifei Cao,Haoyu Li,Xinyu Zheng,Siqing Wang,Chunming Zhou,Shiwei Chen,Peng Yang,Tianyuan Zhou,Hao Chen,Le Zhang
Zr 4+ ion doping is an effective method to enhance the optical and mechanical qualities of Y 2 O 3 transparent ceramics. In most previous studies, slowing down densification and inhibiting grain growth of Y 2 O 3 ceramic are generally recognized as the primary function of Zr 4+ additive during sintering. In this work, an interesting simultaneous precipitation phenomenon of Zr 4+ and Y 3+ ions was discovered and it directly led to the refinement of precursors and Y 2 O 3 powders. Consequently, the acting mechanisms of Zr additive should be demonstrated as the synergistic effect of refining precursor, producing oxygen interstitial and promoting solute-drag. Microstructure evolution and optical quality of Zr doped Y 2 O 3 ceramics were further investigated in detail. By doping 3.0 at.% Zr 4+ ions, Y 2 O 3 transparent ceramics with a transmittance as high as 82.3% at 1064 nm could be realized, after sintering at 1775 °C for 8h in vacuum. In general, this essential synergistic effect should be adequately considered in the preparation of heterogeneous ion doped transparent ceramics using the co-precipitation method.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2023
·
IF 5.7
Fengyi WANG,Ziwen LV,Linxiao Sun,Hongtao CHEN,Mingyu LI
Background In the field of electronic packaging, Sn-58Bi solder paste is a promising low-temperature option for step soldering. However, the tendency for the Bi-rich phase to coarsen and segregate poses a significant challenge to the long-term reliability of the solder joints. Methods The Sn coated Zn (Zn@Sn) core-shell particles were prepared through a chemical plating process and incorporated into the Sn-58Bi low-temperature solder paste to enhance its reliability. The microstructural and mechanical characteristics of the solder joints were evaluated under thermal cycling and thermomigration conditions to assess their long-term service reliability. Significant findings The addition of Zn lowers the nucleation energy and promotes the refinement of the eutectic structure, avoiding a significant reduction in shear strength after thermal cycling. In thermomigration, the heat transfer Q* of Bi is calculated to be 22.5 kJ/mol. The Zn-rich phases hardly move and are evenly distributed within the solder joints, acting like a barrier to prevent the Bi phase diffusing from the hot end to the cold end.
研究领域:
材料科学
·
电子封装技术
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Yanfei Xu,Changwei He,Zheng Zhou
The gelation of walnut protein isolates has not been extensively studied, mainly due to their inherent poor dispersity. This study investigated the gelation of alkaline-extracted walnut protein isolates (AWPI) and phosphorylated walnut protein isolates (PWPI) induced by heat treatment with glucono-δ-lactone (GDL) acidification, focusing on the impact of GDL concentrations on microstructure, rheology, and texture of the resulting gels. The PWPI gel exhibited lower hardness but a smoother structure than the AWPI gel. Notably, acidification with GDL (0.6–1.2%) significantly increased the stiffness of PWPI gels, increasing storage modulus and yield stress 10–50 times, while weakening AWPI gels. Varying concentrations of GDL effectively modulated the microstructure of the PWPI gels, leading to the altered texture (from a soft-solid state to a well-self-supporting stiff-solid gel) and water holding capacity (from approximately 46% to 85%). Additionally, hydrophobic interactions and disulfide bonds were identified as the primary forces involved in the gels.
研究领域:
食品科学
·
蛋白质化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）