CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
·
2022
·
IF 2.004
Chenyang Xu,Jianliang Zhang,Zhengjian Liu,Anjun Xu,Yaozu Wang,Liming Ma,Chuanhui Li
In order to study the change of each phase and the influence of single oxide during the consolidation of pellets. A systematic thermodynamic calculation was carried out through the phase diagram to study the influence of five oxides (CaO, SiO 2 , Fe 2 O 3 , Al 2 O 3 and MgO) on the phase equilibrium of the hematite pellet system. The results show that the content of CaO has the most significant effect on the content of liquid phase and SPINA. There are critical values for the influence of SiO 2 and CaO on the Ca 3 Fe 2 Si 3 O 12 phase, which are 3.5% and 3.0%, respectively. Through in-situ heating experiments, XRD-Rietveld and SEM-EDS, the macro morphology and phase composition of the hardened samples were compared and analyzed. Finally, a multiple regression model is used to predict the liquid content of hematite pellets, which is effective in predicting the phase component.
研究领域:
冶金工程
·
材料科学
·
物理化学
·
过程工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
·
2020
·Vol. 107
·期 1
·73-83
·
IF 2.633
Su Guosheng,Xiao Xiaodong,Du Jin,Zhang Jingjie,Zhang Peirong,Liu Zhanqiang,Xu Chonghai
Since Dr. Carl Salomon proposed the well-known hypothesis on cutting temperatures in 1931, the debate on the hypothesis has never stopped. It shows that evolutions of temperatures with the increase of cutting speed measured at different points are different. From the tool wear and surface integrity point of view, this paper focuses on the evolutions of chip temperature (Chip temp.), tool-chip contact temperature (T-C temp.), and tool-workpiece contact temperature (T-W temp.) with the increase of cutting speed from low (100 m/min) to very high (7000 m/min). First, the cutting heat generation and the temperature increment in machining are theoretically analyzed. Then the influences of chip shape and mechanical property variations with the increase of cutting speed on the temperatures are analyzed. Finally, the cutting temperatures are semiquantitatively derived from chip colors and other heat characteristics in the chip and cutting tool obtained in cutting experiments: evolutions of Chip temp., T-C temp., and T-W temp. with the increase of cutting speed are presented based on the experiment results. The influence of chip shape and temperature variation on tool wear are also discussed.
研究领域:
机械工程
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制造工艺
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材料加工
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热力学
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表面工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2016
·Vol. 31
·期 23
·3757-3765
·
IF 1.579
Caiju Li,Xiaoqing Liu,Jianhong Yi,Long Teng,Rui Bao,Jun Tan,Chao Yang,Zhou Zou
By using high purity aluminum powders and multi-walled carbon nanotubes (MWCNTs) as raw materials, MWCNTs/Al composites were fabricated with ball milling, followed by cold pressing, vacuum sintering, and hot extrusion. It was found that when the sintering temperature was 863 K, MWCNTs/Al composite sintered for 4 h showed good comprehensive properties, and its tensile strength and elongation reached to 156 MPa and 21%, respectively. The comprehensive mechanical properties of the composites became better with raising sintering temperature when the sintering time was 4 h. When the sintering temperature raised to 923 K, the tensile strength of the composite reached to 167 MPa which is three times more than that of annealed high purity aluminum, mainly due to the higher density and better interface bonding resulted from higher sintering temperature. CNTs' pulling out were observed obviously in the fractured surfaces, and load transfer may be the main strengthening mechanism.
研究领域:
材料科学
·
金属基复合材料
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粉末冶金
·
界面工程
·
力学性能表征
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Ning Mao,Shengqiang Liu,Zhen Song,Yi Yu,Quanlin Liu
Near-infrared phosphor (NIR) integrated light-emitting diode (LED) has ideal application prospects in the fields of food inspection and medical imaging. Herein, we have synthesized a garnet-type Ca 3 Y 2 Ge 3 O 12 :Cr 3+ NIR phosphor using solid state reaction method. Broadband NIR emission ranging from 700 to 1100 nm with a peak located at 800 nm indicates a weak crystal field strength for Cr 3+ , which occupies the six-coordinated Y 3+ site. Moreover, the phosphor has satisfactory luminous intensity showing 81%/10% internal/external quantum efficiency and excellent luminescence thermal stability. Our work provides an excellent NIR phosphor choice for NIR LED devices.
研究领域:
材料科学
·
光学工程
·
生物医学工程
·
分子影像
·
光电子学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Hongtao Wang,Yueyue Li,Chenchang Wang,Yuan Li,Jihao Bai,Yueying liu,Linsheng Zhou,Fengmin Liu,Kengo Shimanoe,Geyu Lu
As one of the most promising “next generation” alcohol fuels, n-pentanol brings convenience to our lives as well as challenges. Realizing real-time monitoring of n-pentanol is important to the health of workers in chemical plants. In this work, a series of Au nanoparticles functionalized ZnO nanorods were prepared by a facile one-step solvothermal method. The electronic sensitization and chemical sensitization of Au nanoparticles regulate the thickness of initial depletion layer of ZnO nanorods and increase the amount of adsorbed oxygen species on the surface. The gas-sensing results showed that 2 mol% Au nanoparticles functionalized ZnO nanorods exhibited the highest response of 71.8 to 4 ppm n-pentanol at 260 °C, and showed much higher response than other various saturated monohydric alcohols with different carbon chain lengths. Moreover, the sensor possessed ultra-fast response speed (1 s), excellent stability, and a certain ability of moisture resistance. The sensor was heated at 350 °C to promote the desorption of n-pentanol. The surface depletion layer model and energy band theory were used to explain the enhanced gas-sensing performance. This work provides a suitable candidate for real-time monitoring of n-pentanol in chemical plants.
研究领域:
材料科学
·
传感器技术
·
纳米材料
·
环境监测
·
职业健康
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Fengping Ruan,Degang Deng,Ming Wu,Bowen Chen,Lei Lei,Ruoshan Lei,Shiqing Xu
A novel dual-emitting Ca 8 ZrMg(PO 4 ) 6 (SiO 4 ): (Eu 3+ , Eu 2+ ) phosphors with ultrahigh-sensitive optical temperature sensing are prepared by a conventional solid-state method. The Eu 2+ /Eu 3+ co-activated Ca 8 ZrMg(PO 4 ) 6 (SiO 4 ) phosphors exhibit efficient dual-mode emissions with an intense, broad blue emission peaked at 414 nm and a relative bright red-emitting centered at 614 nm under 297 nm UV-light excitation, respectively. Furthermore, the fluorescence intensity ratio (FIR) technology is applied to analyse the optical temperature sensing performance of Ca 8 ZrMg(PO 4 ) 6 (SiO 4 ): (Eu 3+ , Eu 2+ ) phosphors. Based on different thermal quenching behavior of Eu 2+ and Eu 3+ dual-emitting centers, linear temperature-dependent FIR between Eu 2+ and Eu 3+ is obtained. The maximal absolute sensitivity reaches as high as 5.94% K −1 , which is superior to that for the other luminescent temperature sensing materials reported previously. Analyses of the temperature-dependent photoluminescence spectra and configurational coordinate diagrams for Ca 8 ZrMg(PO 4 ) 6 (SiO 4 ): (Eu 3+ , Eu 2+ ) phosphors indicate that the temperature-sensitive variation in FIR of Eu 2+ to Eu 3+ is originated from the difference in thermal quenching activation energy for 5d→4f transition of Eu 2+ and 5 D 0 → 7 F J (J = 1, 2, 4) transitions of Eu 3+ . These results reveal that the Ca 8 ZrMg(PO 4 ) 6 (SiO 4 ): (Eu 3+ , Eu 2+ ) phosphors show glorious potential in high temperature optical thermometry.
研究领域:
材料科学
·
无机化学
·
光学传感
·
功能材料
·
固体物理
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Rongfu Xu,Yueya Shi,Changhou Li,Yong Xu
Disposal of waste foundry sand is still one of the most critical challenges faced by the foundry industry. The recycling and reusing of waste foundry sand not only lead to a saving of naturally abundant sand sources but also enhance the sustainability of environmental protection. A new approach in recycling waste foundry sand is introduced in the paper. Based on this approach, porous silicon powder is scalably fabricated, employing magnesiothermic reduction. In the initial one cycle, the capacities of the charge and discharge are 2210 mAh/g and 1602 mAh/g, respectively. The coulombic efficiency of the as-prepared porous silicon is about 72%. The as-prepared porous silicon is considered as the potential material for the preparation of silicon-based anodes in high energy Li-ion batteries.
研究领域:
材料科学
·
环境工程
·
能源化学
·
冶金工程
·
纳米材料
·
电化学
·
可持续材料
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yunjing Wang,Shuang Xia,Guang Xiao,Jiangtao Di,Jianfeng Wang
Although desirable in next-generation flexible electronics, fabricating hybrid film materials with excellent integration of mechanical and thermally conductive yet electrically insulating properties is still a challenge. In mollusk nacre, a small volume of the chitin nanofiber framework hosts 95 vol % CaCO3 microplatelets, enabling the high-loading natural composites to exhibit a ductile deformation behavior. Inspired by this, we fabricate a large-area, boron nitride-based bio-inspired paper using a facile sol–gel-film conversion approach, in which BN microplatelets with a loading of 40–80 wt % are embedded into a 3D poly(p-phenylene benzobisoxazole) nanofiber framework. Because of the vital role of the 3D nanofiber framework, the BN-based paper exhibits plastic-like ductility (38–80%), ultrahigh toughness (10–100 MJ m–3), and good folding endurance. The high-loading BN platelets form an oriented, percolative network and endow the paper with outstanding in-plane thermal conductivity (77.1–214.2 W m–1 K–1) comparable to that of some metals, such as aluminum alloys (108–230 W m–1 K–1). Using the electrically insulating BN-based paper as a flexible substrate, we demonstrate its promising application for lowering the temperature of electronic devices.
研究领域:
材料科学
·
纳米复合材料
·
柔性电子学
·
热管理材料
·
仿生工程
✓ 已验证
DOI
高影响因子
SOLAR ENERGY
·
2021
·
IF 5.742
Xiaobo Chen,Yefei Zhuang,Qingyu Shen,Xiaoyu Cao,Wen Yang,Peizhi Yang
Low electrocatalytic activity and/or high charge transfer resistance of counter electrodes (CEs) in quantum-dot-sensitized solar cells (QDSSCs) are the main reasons for the low photovoltaic performance . Herein, the CoS nanoparticles are anchored on the MXene (Ti 3 C 2 T x ) via a simple in-situ hydrothermal reaction process. It is the first attempt to use the MXene/CoS as a highly electrocatalytic CE for QDSSCs . The QDSSCs with a MXene/CoS CE shows a significant enhancement in cell performances and yields a promising power conversion efficiency (PCE) of 8.09% compared with that of the QDSSCs with bare CoS (5.77%) and bare MXene (4.25%) CEs. The significant enhancement of PCE value is mainly attributed to the synergistic effects of the unique layered morphology of conductive MXene nanosheets and its cocatalysis with CoS nanoparticles. The coupling of layered MXene with small CoS nanoparticles (~15 nm) provides abundant catalytic active sites. The improved mesoporous morphology contributes a high specific surface area and fast electron transfer channels for S x 2− reduction. Consequently, the MXene/CoS nanocomposite can be utilized as an effective agent to boost up the photovoltaic performance of QDSSCs.
研究领域:
材料科学
·
能源化学
·
纳米科技
·
光伏技术
·
电化学
✓ 已验证
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 14
·3783
·
IF 3.623
Jian-Ping Qiu,Huan-Qing Xie,Ya-Hao Wang,Lan Yu,Fang-Yuan Wang,Han-Song Chen,Zheng-Xin Fei,Chao-Qun Bian,Hui Mao,Jia-Biao Lian
The removal of organic pollutants using green environmental photocatalytic degradation techniques urgently need high-performance catalysts. In this work, a facile one-step hydrothermal technique has been successfully applied to synthesize a Nb2O5photocatalyst with uniform micro-flower structure for the degradation of methyl orange (MO) under UV irradiation. These nanocatalysts are characterized by transmission and scanning electron microscopies (TEM and SEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) method, and UV-Vis diffuse reflectance spectroscopy (DRS). It is found that the prepared Nb2O5micro-flowers presents a good crystal phases and consist of 3D hierarchical nanosheets with 400–500 nm in diameter. The surface area is as large as 48.6 m2g−1. Importantly, the Nb2O5micro-flowers exhibit superior catalytic activity up to 99.9% for the photodegradation of MO within 20 mins, which is about 60-fold and 4-fold larger than that of without catalysts (W/O) and commercial TiO2(P25) sample, respectively. This excellent performance may be attributed to 3D porous structure with abundant catalytic active sites.
研究领域:
材料科学
·
环境化学
·
纳米催化
·
光化学
·
功能材料
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 5
·271
·
IF 3.504
Renyao Huang,Li He,Tao Zhang,Dianqing Li,Pinggui Tang,Yingying Zhao,Yongjun Feng
Magnesium silicate as a high-performance adsorption material has attracted increasing attention for the removal of organic dye pollution. Here, we prepared a series of magnesium silicate hydrates (MSH) in a hydrothermal route, and carefully investigated the corresponding adsorption behavior towards methylene blue (MB) as well as the effect of surface charge on adsorption capacity. The results show that surface charge plays a key role in the adsorption performance of MSH for MB, a negative surface charge density follows the increase of Si/Mg feeding ratio from 1.00 to 1.75, and furthermore the higher negative charge favors the improvement of the adsorption capacity. Among four investigated samples (MSH = 1.00, 1.25, 1.50, and 1.75), MSH-1.75 has the highest negative surface charge and shows the largest adsorption capacity for MB. For example, the equilibrium adsorption quantity is 307 mg·g−1for MSH-1.75, which is 35% higher than that of 227 mg·g−1for MSH-1.00. Besides, for MSH-1.75, the as-prepared sample with negative charge exhibits ca. 36% higher adsorption quantity compared to the sample at the zero point of charge (pHZPC). Furthermore, magnesium silicate hydrate material with Si/Mg feeding ratio = 1.75 demonstrates the promising removal efficiency of beyond 98% for methylene blue in 10 min, and the maximum adsorption capacity of 374 mg·g−1calculated from the Langmuir isotherm model.
研究领域:
环境化学
·
材料科学
·
纳米技术
·
物理化学
·
污染治理
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Changchun Ji,Yudong Wang,Ning Zhao
Cu Al hydrotalcite-SBA-15 composite materials are prepared by precipitation-deposition method. The CO 2 adsorption and regeneration process are carried out in a fixed bed reactor . This composite has thermal stability derived from hydrotalcite and moderate regeneration temperature from the porous material SBA-15. The adsorption capacities of the composite are obviously improved compared to the pure SBA-15 or hydrotalcite. When the amount of hydrotalcite is increased to 40 wt%, it has the magnitude of adsorption capacity. The inactivation model can well simulate the CO 2 adsorption process of the composite.
研究领域:
材料化学
·
环境科学
·
化学工程
·
多孔材料
·
气体吸附
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）