INTEGRATED FERROELECTRICS
·
2019
·
IF 0.486
Xinling Hu,Dongxu Li,Yanzhen Huang
Titanium carbonitride (TiCN) show many excellent properties as new multifunctional material. In this article, nano-sized TiCN were prepared by environmentally friendly and low-cost hydrothermal processes. The composition, structure and morphology of TiCN were characterized by scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction and X-ray photoelectron spectroscopy. Hardness performance was measured by microhardness tester. Fluorescence performance was tested by fluorescence spectrometer under visible light. Based on the results, the samples prepared at 1000–1100 °C had the highest purity and hardness. The flaky TiCN compounds exhibit excellent mechanical properties and show a promising application in ultra-hard materials.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2018
·
IF 0
Sefiu Abolaji Rasaki,Bingxue Zhang,Siqi Liu,Tiju Thomas,Minghui Yang
ZnO@TiCN nanourchin composites are synthesized via a solid–solid separation process followed by a wet deposition method. The composite contains TiCN nanourchins, metallurgically connected to ZnO ; the system adsorbs Cr(VI) following a pseudo-first order kinetics. This heterostructure has substantial ability to thermochemically convert the adsorbed Cr (VI) to Cr (III). Complete removal of Cr (VI) is achieved, even in the <10 ppm concentration regime. The effect of reaction time, temperature, pH value, adsorbent loading, initial concentration of Cr (VI), and thermodynamic parameters are systematically investigated. Van’t Hoff’s plot based analysis indicates that the entropy change associated with physisorption process involved is significantly positive (∼18 kJ/mol K). The process is also substantially endothermic (△H ∼ 5 kJ/mol). Kinetics improves with temperature up to 90 °C. The high entropy associated with the adsorption is attributed to a high heterogeneity factor of ∼3.9. Pseudo-second order is the best kinetic model to describe the adsorption of Cr(VI) onto the surface of ZnO@TiCN; both Freundlich and Langmuir isotherms describe the adsorption observed. Over 4 regeneration cycles, an adsorption capacity retention of >90% is observed. This novel adsorbent, with its hierarchical structure, and properties reported here, suggest that it could find applications in contemporary waste water treatment processes.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
SN Applied Sciences
·
2018
·Vol. 1
·期 1
·1-9
·
IF 0
Zhang Liuting,Ji Liang,Yao Zhendong,Cai Zeliang,Sun Ze,Yan Nianhua,Zhu Xinqiao
The hydrogen storage properties of MgH 2 – x wt%TiCN ( x = 5, 10, 15) composites were systematically investigated and the results show that the addition of TiCN can effectively improve the de/rehydrogenation kinetics of MgH 2 . Taken the onset dehydrogenation temperature and isothermal de/rehydrogenation kinetics into consideration, the MgH 2 –10 wt% TiCN composite was shown to have the best performance. It was found that the MgH 2 –10 wt% TiCN composite could release 4 wt% H 2 in 17.3 min at 300 °C while the as-synthesized MgH 2 could not release any hydrogen under the same condition. Besides, the MgH 2 –10 wt% TiCN composite could absorb 4.63 wt% H 2 under 3.2 MPa hydrogen pressure at 300 °C within 20 s. Compared with as-synthesized MgH 2 , the activation energy of the MgH 2 –10 wt% TiCN composite was significantly decreased from 183.76 ± 10 to 106.82 ± 5 kJ/mol. X-ray diffraction analysis revealed that the TiCN remained stable during the ball milling and the following de/rehydrogenation cycle. The catalytic mechanism was also proposed that the TiCN particles absorbed on MgH 2 not only served as charge transfer centers and accelerated the hydrogen incorporation and dissociation rate but also provided more diffusion channels for hydrogen, which contributed to the good de/rehydrogenation properties of MgH 2 .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Jinrui Liang,Kai Le,Yuzhen Liu,Young-Jun Jang,Fengchun Jiang,Zhenlin Yang,Haixin Li,Shusheng Xu,Weimin Liu
To improve the friction and wear performance of coatings in aerospace engineering under wet and dry alternating conditions, the porous hard TiCN coating was prepared by a combination of multi-arc ion plating and oblique angle deposition. The study found that when the titanium target current was reduced from 80 A to 60 A, the pore size of the porous TiCN coating increased from 0.30 μm to 0.93 μm. In comparison to the low hardness of stainless steel substrate of 3.4 GPa, the hardness of TiCN coatings with pore sizes of 0.93 and 0.30 μm rose to 10 and 22 GPa, respectively. The existence of pores can effectively improve the hydrophilicity of the coatings. However, as the pore size increased, the anti-wear lifetime of the coatings were also decrease. This process was followed by ultrasonication and hydrogen reduction of (NH 4 ) 2 MoS 4 to infuse MoS 2 directly into the pores to fabricate the TiCN-MoS 2 composite coatings. The findings revealed MoS 2 atomic sheets are randomly embedded in the pores of the TiCN coating. In a stable humidity environment, as the relative humidity increased, the friction coefficient of the TiCN-MoS 2 porous composite coating increased and the anti-wear lifetime decreased. In addition, the anti-wear lifetime of the TiCN-MoS 2 porous composite coating at 20 % relative humidity environment is 128,322 laps, which exceeded the 38,099 laps of the dense TiCN-MoS 2 composite coating. This proved that the porous composite coating had better anti-wear lifetime due to the continuous release of MoS 2 in the pores under low humidity conditions. The tribological behavior of the porous composite coatings was systematically investigated under alternating humidity conditions, with a comparison against the dense TiCN-MoS 2 composite coatings. The porous composite coatings possessed better self-adaptation under alternating humidity conditions, with coefficients of friction of 0.05 and 0.15 at 10 % and 70 % RH air, respectively. A detailed discussion was conducted on the relationship between tribofilm composition and tribological properties under different humidity environments.
研究领域:
材料科学
·
表面工程
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Yu Wang,Feng Gu,Lei Cao,Lanlan Fan,Tianjie Hou,Qian Zhu,Yu Wu,Shixian Xiong
Developing non-noble metal oxygen reduction reaction (ORR) electrocatalysts with high performance, excellent stability, and low-cost is crucial for the industrialization of fuel cells. Herein, trace level Co modified 3D hybrid titanium carbonitride MXene and boron-carbon-nitrogen nanotubes catalyst (TiCN–BCN–Co) is fabricated by spray-lyophilization and high-temperature pyrolysis . This strategy not only avoids the oxidation of Ti 3 C 2 T x MXene, but also introduces nitrogen atoms into the titanium carbide lattice to form a more electrocatalytically active TiCN crystal phase. The obtained TiCN–BCN–Co exhibits superior ORR catalytic activity with a positive half-wave potential of 0.83 V vs. RHE and outperforms commercial Pt/C in terms of stability and methanol tolerance. Impressively, the Zn-air battery with TiCN–BCN–Co cathode achieves a superior specific capacity of 791 mAh g −1 and long-term stability of 200 h.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Junxiao Tang,Wei Ji,Jingjing Xie,Yunwei Shi,Yuexu Zhu,Qianglong He,Weimin Wang
In this study, B 6.5 C-TiB 2 -SiC-BN composite was fabricated via reactive hot pressing from a powder mixture of TiCN, B, and Si. The reaction process of the powder mixture was investigated by heat treatment at elevated temperatures. The as-reacted powder products possessed a core-shell structure of TiB 2 surrounded by h-BN. During densification, the h-BN in this structure acts as a diffusion channel and lubricant, which promoted the densification process. The extremely small size, fresh surface of in-situ formed phases, and uniform dispersion in synthesized powders also contributed to sintering. The designed reactive hot-pressing sintering effectively resolves the difficulty of obtaining uniformly-dispersed BN. The obtained bulk B 6.5 C-TiB 2 -SiC-BN composite ceramic shows high relative density (98.8%) and good comprehensive mechanical properties including hardness, bending strength , and fracture toughness of 19.6 GPa, 801 MPa, and 5.31 MPa m 1/2 , respectively.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xiaoliang Sun,Wenxia Zhu,Huijie Wang,Xiao Yan,Dong Su
Ceramic aerogels show excellent thermal insulation and functional performance for their unique nanoporous structure. However, conventional ceramic aerogels often undergo structural collapse and performance deterioration in high-temperature environments due to sintering, crystallization, and/or phase transition. Here, we designed a TiCN/SiBCN ceramic aerogel in which the TiCN phase was in situ formed through a carbothermal reaction during pyrolysis. Benefiting from its unique pearl-necklace-like structure, the TiCN/SiBCN aerogel exhibits a high specific surface area (248 m2/g), a low thermal conductivity (0.08 W/m·K), and a considerable compressive strength (2.2 MPa). The formation of a stable TiCN phase endows the aerogel with significant resistance to thermal decomposition and crystallization up to 1800 °C. Moreover, the TiCN/SiBCN aerogel retains high surface area and low thermal conductivity after thermal treatment, indicative of the stability and reliability of the nanoporous structure. The TiCN/SiBCN ceramic aerogel with superior thermal and structural stability is an ideal candidate for structural and functional applications in high-temperature environments.
研究领域:
材料科学
·
陶瓷
·
纳米材料
·
热绝缘
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Bo Xu,Fengyi Wang,Minxian Shi,Zhixiong Huang
Alumina fiber reinforced composites (AFC) have attracted massive attention in thermal protection materials due to their excellent high temperature mechanical properties. However, the application of the AFCs is restricted by their easy failure at high temperature condition for the sake of phase transition and grain growth. In this work, a series of alumina fiber based ceramizable composites modified with TiCN and B 4 C were prepared. The thermal stability, phase evolution, thermal insulation performance and anti-ablation mechanism of the composites were investigated. The flexural strength and residual weight yield of obtained ceramizable composite after static ablation at 1200 ℃ was 22.3 MPa and 85.8 %, showing obvious enhancement compared with those of the composite without ceramic fillers. The good ablation resistance and high temperature bearing capacity of the composites can be attributed to the formation of protective layer of rutile phase TiO 2 and the grain-refining effect of ceramic phase.
研究领域:
材料科学
·
陶瓷
·
热防护系统
·
复合材料
✓ 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）