JOURNAL OF ALLOYS AND COMPOUNDS
·
2014
·
IF 2.726
Zhixiao Zhang,Chongjun Xu,Xianwu Du,Zili Li,Jilin Wang,Weihong Xing,Yuan Sheng,Weimin Wang,Zhengyi Fu
High-performance TiB 2 –SiC composites were fabricated with a new reaction system of B 4 C–TiC–Si by reactive hot pressing. The reaction process was controlled by the diffusion of boron atoms and hindered by the accumulated product layer of TiB 2 and C. The melting Si can offer another diffusion path for boron atoms, thereby promoting the reaction process. The Vickers hardness , flexural strength , and fracture toughness of the fabricated TiB 2 –SiC composites respectively reached 28.6 ± 0.6 GPa, 654 ± 49 MPa, and 6.8 ± 0.5 MPa m 1/2 . Both the intergranular fracture resulting from mismatch in thermal expansion coefficient between TiB 2 and SiC and the transgranular fracture resulting from the network structure of TiB 2 can enhance the fracture toughness of the TiB 2 –SiC composite.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Ye Zhang,Doudou Wang,Zhixuan Huang,Haiyan Zhang,Lili Li
The exploring of sustainable, durable and superwetting composite nanofiber membrane as efficient separator for oil-water emulsion is one of the biggest challenges in the field of wastewater treatment . Herin, an environment-friendly polyurethane (bio-PU) was synthesized by introducing biodegradable polycaprolactone diol (PCL d ) segments. The superhydrophobic modified titanium carbide nanoparticle (TiC p ) by 1H,1H,2H,2H-Perfluorodecyltrimethoxysilane (PFDTS) was decorated on eletrospun bio-PU nanofiber matrix, which could also regulate the microstructure of bio-PU composite membrane . The prepared bio-PU/TiC P membrane displayed superhydrophobicity with WCA of 153.1 ± 1.2°, which attributed to its hierarchical structure composed of nanofibers, microspheres and nanoparticles. Even for oil-water emulsion, the bio-PU/TiC P membrane exhibited the outstanding separation efficiency of 99.65% and high flux of 2464.79 L m −2 h −1 . The bio-PU/TiC P membrane also had the excellent self-cleaning, water repellency and recyclability. These characters endowed it great potential application in sustainable separator.
研究领域:
环境科学
·
材料科学
·
废水处理
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2022
·
IF 20.831
Ling Zhang,Jiaying Bi,Tao Liu,Xiaorong Chu,Haijian Lv,Daobin Mu,Borong Wu,Feng Wu
The rapid decay of the charge/discharge capacity of lithium-sulfur batteries due to the sluggish reaction kinetics and the shuttling behaviour of soluble polysulfides significantly restricts their practical application in energy storage systems. Herein, two-dimensional TiN/TiC heterostructures embedded with single tungsten atoms (SWA) are developed and introduced as a modified interlayer (SWA-TiN/TiC) in Li-S battery devices. The SWA-TiN/TiC material has a large specific surface area, which provides a physical barrier while supplying numerous active sites for polysulfides reactions. TiN and TiC both demonstrate excellent electronic conductivity and catalytic activity, which facilitate the conversion of polysulfides. Meanwhile, the uniformly-dispersed SWAs significantly enhance the chemical affinity with polysulfides and accelerate their redox reactions. As a result, the sulfur cathodes coated with the SWA-TiN/TiC interlayer achieve excellent rate performance and long-term cycling stability. An ultrahigh specific capacity of up to 1577.7 mAh g −1 at 0.1 C is achieved, and even at high sulfur loading (6.25 mg cm −2 ), a high areal capacity of 4.63 mAh cm −2 is obtained. This work highlights the potential of single metallic atoms on non-carbonaceous matrix for the development of high-performance catalysts that can achieve strong polysulfides immobilization for practical applications in lithium-sulfur batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Lei Zheng,Zhanjun Liu,Hongchao Zhao,Quangui Guo,Mingyu Zhang,Qizhong Huang
In this work, high-sinterability ZrC–SiC–TiC ceramic powders were synthesised through a sol-gel approach coupled with subsequent carbothermal reactions. Specifically, MgCl 2 was utilised as an additive to enhance the sintering activity of the powders. Experimental results revealed that the introduction of Mg and variation in Zr/Ti molar ratios significantly influenced the phase and morphological evolution of the precursor. In the form of a Mg–Si–O liquid phase, Mg promoted carbothermal reduction and solid-solution reactions. It ultimately remained as amorphous Mg–Si–O oxide in the final ZrC–SiC–TiC ceramic powders, effectively improving the sintering activity of ceramic powders. Consequently, dense Mg-modified ZrC–SiC–TiC ceramics with high relative density up to 99.2 % were successfully fabricated by spark plasma sintering at 1700 °C and 30 MPa.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Wenjie Zhu,Yuwei Ren,Minghang Li,Yichun Bi,Ce Zheng,Xiaoqiang Li
Ti 3 SiC 2 MAX phase with a purity of up to 98 vol%, comparable to the purity of commercial Ti 3 SiC 2 prepared by Hot Pressing (HP), was synthesized by Reactive Melt Infiltration (RMI) in this work, overcoming the inherent shortcoming of RMI products' poor purity. Compared with HP Ti 3 SiC 2 , the lower preparation temperature and pressure-free fabrication of high-purity RMI Ti 3 SiC 2 make it promising for applications in the Ceramic Matrix Composites (CMCs), especially for complex shaped CMCs parts. This work systematically studied the generation mechanism of Ti 3 SiC 2 with the help of κ-Al 2 O 3 during the RMI process, which enables the successful production of high-purity Ti 3 SiC 2 . The toughening mechanism of Ti 3 SiC 2 in Ti 3 SiC 2 composites was also characterized and analyzed. This work attempts to provide a new idea for introducing high-purity ceramic phase into CMCs by RMI process.
研究领域:
材料科学
·
陶瓷材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Xiaorong Zhang,Zhixiao Zhang,Yuming Liu,Yanming Wang,Xiying Fu,Yongmei Bai,Guangshuo Wang,Jingbo Mu,Xiaoliang Zhang,Hongwei Che
We studied the effects of particle size of raw materials (B 4 C, TiC and Si powders) on the characteristics of both TiB 2 –SiC composite powders and ceramics. Results show that the size of B 4 C and Si particles hardly affects the size of TiB 2 and SiC particles because B 4 C is decomposed and consumed during the formation of TiB 2 , and Si is melted during the formation of SiC. The size of SiC particles is within the nano and submicron scale. However, the size of TiC particles determines the sizes of TiB 2 particles and TiB 2 grains in the composite ceramics because TiC particles serve as templates to form TiB 2 particles. Consequently, the microstructure and mechanical properties of the TiB 2 –SiC composite ceramics are affected. The TiB 2 –SiC composites fabricated using nano-sized TiC powder possess smaller grain size, better dispersibility and more reasonable crack propagation path, thereby obtaining the optimal mechanical properties (Vickers hardness of 30.2 GPa, flexural strength of 732 MPa and fracture toughness of 7.37 MPa m 1/2 ).
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
CARBON
·
2022
·
IF 11.307
Ze Zong,Penggang Ren,Zhengzheng Guo,Jin Wang,Jie Hu,Zhengyan Chen,Yanling Jin,Fangfang Wang,Fang Ren
Developing high-performance electromagnetic interference (EMI) shielding composites with absorption-dominant is an effective method to address the problem of violent electromagnetic radiation pollution. Herein, the MXene-derived TiC-carbon nanotube (CNT)/cellulose-derived carbon aerogel was prepared by grafting, freeze-drying and pyrolysis process . The electrostatic attraction between cationic cellulose and MXene-CNT hybrid fillers improves the dispersion of fillers. The as-prepared aerogel composites exhibit the high absorption capacity of electromagnetic waves (EMWs) owing to embedding fillers into cell walls prevents the blockage of macro pores . On the basis of this, the massive heterogeneous interfaces, the synergistic effect of TiC and CNT, as well as the polarization and relaxation processes of N-doped carbon improve the attenuation capacity for EMWs. The EMI shielding effectiveness (SE) value boosts up from ∼50 dB for pure cellulose-derived carbon aerogel to 89.7 dB in conjunction with the superior absorption coefficient of 0.77 at the total fillers content of only 3 wt% in the precursor aerogel. Additionally, the aerogels show low thermal conductivities due to the macro pores. Therefore, the lightweight composite aerogel with the remarkable EMI shielding performance and excellent thermal insulation property is highly promising for applications in aerospace, telecommunications and building construction.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zhengzheng Guo,Penggang Ren,Jin Wang,Xin Hou,Jiahui Tang,Zongbin Liu,Zhengyan Chen,Yanling Jin,Fang Ren
The development of absorption-dominant electromagnetic interference (EMI) shielding materials with high-efficiency EMI shielding effectiveness (SE) and low reflection (R) is crucial but challenging for next-generation electronics devices and telecommunication. In this regard, a facile and environmentally friendly approach was proposed to fabricate N, S- co -doped TiC/carbon hybrid aerogels with hierarchically porous architecture through MXene/cellulose hybrid hydrogels as precursors for adsorbing dyes, followed by freeze drying and carbonization process. Profiting from the synergistic effect of highly interconnected three-dimensional (3D) porous structure, heterogeneous conductive network with greatly conductive difference as well as heteroatoms-doping induced dipole polarization, the resultant aerogel with an ultra-low density (47.1 mg/cm 3 ) achieves a highly efficient EMI SE of 84.3 dB at 12.4 GHz (average 81.8 dB in the X-band) and a superior absorption coefficient of 0.68 simultaneously. Meanwhile, the highly porous structure endows the prepared aerogels with outstanding thermal insulating capacity, which is essential to provide infrared stealth and radar stealth for military equipment and to protect sensitive electronic devices from high-temperature attacks. This work offers a prospective strategy for constructing high-performance absorption-dominated EMI shielding materials with excellent thermal insulation properties, and the obtained aerogels present broad application prospects in the fields of aviation, portable electronic equipment and national defense industry.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Wenzhong Wang,Xuting Bai,Hao Zhou,Jiajia Shan,Xue Wang
The synthesis of carbon quantum dots (CQDs) from renewable resources is extensively regarded as a green approach, but this method is generally accompanied by high energy consumption and complex byproducts, which limit the large-scale production of CQDs. In this work, titanium carbide-derived CQDs (TiC-CQDs) were synthesized only by mixing titanium carbide and hydrogen peroxide (1 wt %) at room temperature. The resulting byproduct was converted to a precipitate by sodium hydroxide to purify the TiC-CQDs, and the reaction mechanism was further explored. The average lateral size of TiC-CQDs is 4.2 ± 1.1 nm and shows excellent fluorescence properties. Moreover, in an acetic acid-sodium acetate buffer solution, the fluorescence of TiC-CQDs could be selectively quenched by a ferric ion (Fe3+) with a broad concentration range of 0.2–5 μM and 5–60 μM and a detection limit as low as 0.14 μM. Due to the absence of the energy input, complex equipment, and nontoxic and harmless precursors, the novel room-temperature synthesis route of TiC-CQDs is energy-efficient, safe, green, and economical, and has great potential in industrial application.
研究领域:
材料科学
·
分析化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Sheng Pang,Liangwei Cong,Youpeng Xu,Yiwei Sun,Dong Wang,Guoyu Qian,Zhi Wang
Typically, the X-ray diffraction spectrum of a highly oriented structure (HOS) MAX phase displays a prominent (002) characteristic peak. Surprisingly, this principle does not hold true for Ti 2 SC. Instead, the synthesized Ti 2 SC consistently exhibits a polyhedral structure (PS). Furthermore, even with hot-pressing sintering, the purity of Ti 2 SC remains relatively low. The primary factors contributing to anomalous crystal structures and low purity are insufficient crystal growth and limited reactant contact. In this study, we successfully achieved dual regulation of the crystal structure and purity of Ti 2 SC within the Ti/TiC/FeS 2 system, which was accomplished by enhancing reactant contact and controlling the growth rates of crystal planes. Notably, the intermediate products FeS and Fe, existing in a liquid phase at varying temperatures, played a crucial role in both the formation of Ti 2 SC and the growth of Ti 2 SC crystals. As a result, PS-Ti 2 SC and HOS–Ti 2 SC with purity greater than 99 wt% were successfully prepared. The formation of PS-Ti 2 SC can be attributed to the inadequate growth of each crystal plane at relatively lower temperatures (1500 °C). While the synthesis of HOS–Ti 2 SC necessitates the utilization of both a liquid phase and high temperature, as the epitaxial growth mechanism followed by vertical growth has been demonstrated to facilitate the generation of highly oriented crystals. The liquid phase facilitates the swift growth of Ti 2 SC crystals along the (001) crystal plane, while the (002) crystal plane necessitates a higher temperature (1760 °C) for relatively rapid growth. This work will open a new pathway for the development of the MAX phase from the perspective of crystal structure regulation and high purification preparation.
研究领域:
材料科学
·
晶体学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2022
·Vol. 20
·期 3
·1487-1503
·
IF 2.328
Yao Li,Yu Wang,Jian Cui,Guo-Hua Zhang
High-entropy carbides (HECs) possess superior properties such as favorable corrosion resistance and marvelous hardness and are widely applied in specific extreme environments. Herein, a novel method was proposed for synthesizing HECs powders with raw materials of corresponding oxides and carbon black, which was composed of steps of ball-milling in stainless jar, carbothermic reduction at 1873 K, as well as the following calcium posttreatment at 1273 K to remove residual carbon by generating CaC 2 . Finally, pure HECs powders could be fabricated after acid leaching treatment. Under the current experimental conditions, besides HfC-TaC-ZrC-NbC quaternary system, a homogeneous solid solution could be fabricated by adding Mo or/and Ti, but it could not be achieved for systems with addition of V, W, or Cr, owing to the low lattice constant or different crystal structure of corresponding carbides. In the reduction step, iron resulted from ball milling process acted as the diffusion channel to promote the mutual diffusion of different components. Meanwhile, the calcium treatment temperature had a weak effect on particle size of HEC powders. HfC-TaC-ZrC-NbC-MoC-TiC powders prepared at the calcium posttreatment temperature of 1273 K had an oxygen content of .302% and an average grain size of 252 nm.
研究领域:
材料科学
·
冶金学
·
化学工程
✓ 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）