DIAMOND AND RELATED MATERIALS
·
2020
·
IF 2.65
Xiao-yu Zhang,Min Xu,Sheng-zhu Cao,Wen-bo Chen,Wen-yao Yang,Qin-yu Yang
Diamond/copper composite has been considered as one of the next generation thermal management materials. Interfacial modification is an essential means of ameliorating interface wettability and bonding of diamond/copper composite for improving its thermal conductivity . In the present work, Diamond/copper composite was manufactured by using spark plasma sintering (SPS) technology with 60% volume fraction of diamond mixed with 40% volume fraction of copper power, chromium powder (0.7 wt%) and scandium oxide powder (0.21 wt%). A series of material analysis methods were used to characterize the microstructure, interfacial layer , phase compositions and distributions of Diamond/copper composite. The total and partial electron density of states (DOS) for Diamond-Cr-Sc 2 O 3 interfacial model was investigated by means of first-principles calculations from CASTEP modules. The results showed Sc 2 O 3 made a 5–20 nm well-arranged and uniformly distributed interfacial chromium carbide layer in the interface region, which played a critical role in increasing the amount of reactive interfacial bonding and decreasing defect. The addition of Sc 2 O 3 brought the increasing number of heat transfer carriers at the interface and made the interface energy system more stable. The obtained diamond/copper composite exhibited that the wettability between diamond particles and copper was effectively improved. The thermal conductivity of diamond/copper is 872 W/(m·K) and the possible reasons for doping rare-earths Sc 2 O 3 to improve the thermal conductivity were discussed.
研究领域:
材料科学
·
复合材料工程
·
界面科学
·
热管理材料
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粉末冶金
·
计算材料学
✓ 已验证
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 23
·6024
·
IF 3.1
Chunmei Wen,Shuai Xu,Bingsheng Li,Shuyun Gan,Li Wang,Keyuan Chen,Yuwen Xue,Zhongqiang Fang,Fan Zhao
Five carbide powders, TiC, Cr3C2, ZrC, NbC and SiC, were selected as raw materials and mixed by dry or wet milling. Then (TiCrZrNb)C4-SiC multiphase ceramics were successfully prepared by spark plasma sintering (SPS) at 1900 °C, using D-HECs-1900 (dry milling method) and W-HECs-1900 (wet milling method), respectively. In this study, the effects of the ball milling method on the microstructure and mechanical properties of the multiphase high-entropy ceramics were systematically investigated. Compared to D-HECs-1900, W-HECs-1900 has a more uniform elemental distribution and smaller grain size, with an average grain size of 1.8 μm, a higher Vickers hardness HV0.1= 2178.41 kg/mm2and a higher fracture toughness of KIC= 4.42 MPa·m1/2. W-HECs-1900 also shows better wear resistance with a wear rate 1.01 × 10−8mm3·N−1·m−1. The oxide friction layer formed during friction is beneficial for reducing frictional wear, making W-HECs-1900 a potential wear-resistant material.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2019
·
IF 2.12
Hong-Liu Jiang,Meng-Ya Xu,Ze-Wu Xie,Wei Hai,Xiao-Lin Xie,Fu-An He
β-cyclodextrin (β-CD) was firstly crosslinked by tetrafluoroterephthalonitrile and then modified by ethanolamine (EA) to form a novel β-cyclodextrin-based polymer (EA-CDP). The microstructure and the properties of the EA-CDP were characterized by SEM , MIP, 13 C NMR, FTIR , water contact angle measurement, zeta potential measurement, and TGA . The resultant EA-CDP could effectively select the anionicmethyl orange (MO) dye from the mixed-dye aqueous solution of MO and cationic methylene blue (MB) dye. The absorption capacity of the EA-CDP for anionic dyes including MO and Congo red (CR) increased with the decreasing pH value. The pseudo-second-order kinetic was more ideal to describe the absorption behavior of EA-CDP for MO and CR than the pseudo-first-order model. According to the fitting result of the Langmuir equation, the maximum absorption capacity of the EA-CDP for MO and CR reached as high as 602 mg/g and 1085 mg/g, respectively. Such a high absorption capacity could be ascribed to the triple absorption effects of the EA-CDP for anionic dyes including porous network capture, inclusion complextion, and electrostatic attraction.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2016
·Vol. 163
·期 14
·A2991
·
IF 3.014
Jia Liu,Xianyou Wang,Qun Lu,Ruizi Yu,Manfang Chen,Siyu Cai,Xingyan Wang
Nitrogen and sulfur co-doped carbons derived from chromium carbide (NSCDC) are successfully synthesized by chemical extraction of chromium atom from chromium carbide and followed by a facile hydrothermal treatment using thiourea as nitrogen and sulfur sources. The physicochemical and electrochemical properties of the as-prepared materials are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption/desorption isotherm, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier infrared spectroscopy (FTIR), cyclic voltammetry (CV), galvanostatic charge/discharge tests (GCD), electrochemical impedance spectroscopy (EIS) and cycle life measurements. The results demonstrate that nitrogen and sulfur species are successfully incorporated into carbon derived from chromium carbide (CDC), and the obtained NSCDC can still maintain interconnected mesoporous carbon network which is favorable for rapid transport of electrolyte ions. Besides, NSCDC exhibits the enhanced wettability, improved conductivity and excellent supercapacitive performance generated from the incorporation of nitrogen and sulfur. The maximum specific capacitance of 281.2 F g−1 at 1 mV s−1 can be achieved for the NSCDC-4. Moreover, the NSCDC-4 supercapacitor possesses excellent cyclic stability with high capacitance retention of 95% after 6000 consecutive cycles. These exciting results reveal that NSCDC is a kind of promising electrode material for the high performance supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Zhihui Tian,Zexuan Wang,Pufan Yao,Chaoqun Xia,Tai Yang,Qiang Li
In this study, some transitional metal carbides (Ti 3 C 2 , Ni 3 C, Mo 2 C, Cr 3 C 2 and NbC) were prepared to enhance the hydrogen storage behaviors of magnesium-based materials. The carbides with a weight ratio of 5 wt% were introduced into magnesium hydride (MgH 2 ) by mechanical ball milling , and the microstructure, phase composition and hydrogen storage properties of the composites were studied in detail. The phase compositions of Ni 3 C, Mo 2 C, Cr 3 C 2 and NbC in the ball-milled composites have not changed during hydrogen absorption and desorption cycles. However, Ti 3 C 2 decompose into multivalent Ti during hydrogenation process . All of these metal carbides can enhance the hydrogen absorption and desorption kinetics of MgH 2 . Among them, Ti 3 C 2 shows the best catalytic effect on dehydrogenation kinetic properties of MgH 2 , followed by the Ni 3 C, NbC, Mo 2 C and Cr 3 C 2 .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）