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
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陶瓷工程
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DOI
高影响因子
Nanotechnology Reviews
·
2022
·Vol. 11
·期 1
·3031-3041
·
IF 6.739
Pengfei Li,Minxian Shi,Zongyi Deng,Pengkun Han,Tingli Yang,Rui Hu,Chuang Dong,Rui Wang,Jie Ding
Thermal protection system (TPS) is of great significance to launch hypersonic flight and landing process of hypersonic vehicles, which can effectively shield the hypersonic vehicle from severe aerodynamic heating encountered. Phenolic aerogels play an important role in TPS due to their characteristics of low density, high porosity, and low thermal conductivity. However, phenolic aerogel is easy to be oxidized at elevated temperatures under oxidizing environments, which severely limits its large-scale application as thermal insulation materials in TPS. In this study, a novel TiB 2 –B 4 C/carbon (TB/C) aerogel composite was synthesized by introducing TiB 2 and B 4 C particles into phenolic aerogels through quick-gelation and mechanical mixing. The developed aerogel composites were characterized by scanning electron microscopy, Fourier transform infrared, thermal analysis, etc. , to evaluate their microstructure, oxidation resistance, and mechanical properties. Experimental evidence showed that TiB 2 and B 4 C particles reacted with the oxygen-containing molecules to form TiO 2 –B 2 O 3 layer, which effectively improved oxidation resistance and mechanical properties of phenolic aerogel composites.
研究领域:
材料科学
·
航空航天工程
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DOI
高影响因子
MATERIALS & DESIGN
·
2017
·
IF 4.364
Wei Li,Yi Yang,Ming Li,Jie Liu,Daosheng Cai,Qingsong Wei,Chunze Yan,Yusheng Shi
The microstructure design strategy is introduced to improve the mechanical property of a novel γ-Ti-43.5Al-6.5Nb-1.5Cr-0.5C/TiB 2 metal matrix composite (MMC) fabricated by hot isostatic press (HIP). With increasing the content of TiB 2 from 0 to 3 wt%, the average grain size , {001} maximum texture index and average schmid factor of HIP-processed Ti-43.5Al-6.5Nb-1.5Cr-0.5C/TiB 2 parts generally decrease from 27.4 μm, 7.9 and 0.43 to 22.7 μm, 4.1 and 0.38, in addition, the crystallographic texture transforms from the mixture of (001) and (111) orientations to a strong (101) orientation. The phases evolution mechanism in the HIP-processed Ti-43.5Al-6.5Nb-1.5Cr-0.5C/TiB 2 parts can be divided into four steps: first of all, β phase transforms to γ and α phases , then, a small amount of new phases of TiB and TiC emerge by the diffusion of Ti and C atoms, subsequently, the β and α orderly transform to B 2 and α 2 , lastly, the B 2 , α 2 , TiB 2 , TiB and TiC uniformly distribute in the γ matrix. Both the tensile strength and strain of HIP-processed Ti-43.5Al-6.5Nb-1.5Cr-0.5C/TiB 2 components increase from 471.9 MPa and 1.7% to 653.4 MPa 2.1% with the increase of TiB 2 content from 0 to 3 wt%.
研究领域:
材料科学
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机械工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Hui Luo,Yunshu Yang,Liwen Lu,Guangxu Li,Xinhua Wang,Xiantun Huang,Xiaoma Tao,Cunke Huang,Zhiqiang Lan,Wenzheng Zhou,Jin Guo,Haizhen Liu
Li–Mg–B–H composite (2LiBH 4 + MgH 2 ) possesses a very high hydrogen storage capacity of 11.4 wt%. However, it still suffers from high operating temperature, slow kinetics, and poor reversibility. In this work, the two-dimensional Ti 3 CN MXene was first synthesized and then introduced into the Li–Mg–B–H composite. The addition of 5 wt% Ti 3 CN reduces the onset dehydrogenation temperature of the 2LiBH 4 + MgH 2 composite by about 50 °C and shortens the induction period of the LiBH 4 decomposition at 400 °C from >90 min to <10 min. The reversible capacity maintains at 8.3 wt% after 20 cycles, with a capacity retention ratio of 93%. Microstructure studies show that Ti 3 CN will partially transform to a highly-dispersed nano-TiB 2 with particle size around 5 nm. Such nano-TiB 2 could serve as an active catalyst to significantly improve the kinetics and reversibility of the Li–Mg–B–H composite. This work offers a strategy to enhancing the hydrogen storage performance of the advanced metal borohydride-based composites by addition of the MXene material and provides some new insights in understanding the role of MXene in tailoring the hydrogen storage properties of the Li–Mg–B–H composite.
研究领域:
材料科学
·
能源存储
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产品关联
DOI
高影响因子
COMPUTATIONAL MATERIALS SCIENCE
·
2025
·
IF 3.3
Peipei Liu,Chunchun Dong,Xiping Chen,Xuemin Liang
Superhard ceramics are suitable materials to improve the surface characteristics of titanium. In this study, TiB 2 nanopowder was coated on titanium substrate using electrophoretic deposition in NaF-AlF 3 -Al 2 O 3 molten salts. The effects of varying deposition voltages and deposition times on TiB 2 coatings were investigated. Additionally, the microstructure of the coating surface was observed by scanning electron microscopy. With an applied cell voltage of 1.2 V and a deposition time of 1.5 h, a dense, defect-free TiB 2 /TiB composite coating (including the outer TiB 2 layer and the inner TiB whiskers layer) approximately 74 μm thick was produced, exhibiting a strong metallurgical bond to the substrate. A densely packed TiB whisker layer forms at the TiB 2 /Ti interface. The work of adhesion, interfacial energy, and electronic structure of the α-Ti(0001)/TiB 2 (0001) interfaces have been calculated using first-principles methods. Simultaneously, the diffusion of B atoms at the TiB 2 /Ti interface was computed to explain the formation process of TiB whisker layers. The work of adhesion calculations indicated that the B-HCP-Ti interfacial model exhibited the highest interfacial bond strength. The electronic structure of the interfacial model was analyzed to show that the Ti-terminated interface model was primarily formed through metallic bonds, while the B-terminated interface model was primarily formed through covalent bonds. Compared to the Ti-terminated interface, the B-terminated interface facilitates the diffusion of boron from TiB 2 into the titanium substrate more effectively.
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DOI
高影响因子
Materials Today Physics
·
2021
·
IF 9.298
Shaoxiong Li,Yuanyuan Wang,Jie Liang,Tong Xu,Dongwei Ma,Qian Liu,Tingshuai Li,Siran Xu,Guang Chen,Abdullah M. Asiri,Yonglan Luo,Qi Wu,Xuping Sun
Electrocatalytic N 2 reduction is regarded as an attractive alternative to the industrial Haber-Bosch process for mild NH 3 synthesis. However, its practical feasibility requires efficient electrocatalysts with high activity and selectivity . Herein, we first report using sputtered TiB 2 film to enable superb artificial N 2 reduction electrocatalysis . In 0.1 M HCl, such TiB 2 seizes a great NH 3 yield of 1.75 × 10 −10 mol s −1 cm −2 and a high Faradaic efficiency of 11.37% at −0.30 V vs. reversible hydrogen electrode with excellent durability. Density functional theory calculations further evidence that the high activity and selectivity of TiB 2 arise from the positively charged Ti atomic plane, which facilitates the adsorption, activation, and hydrogenation of N 2 molecules while well suppresses the binding of H atoms.
研究领域:
材料科学
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电化学
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催化
·
理论化学
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产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2022
·
IF 9.417
Yanqing Xue,Qitang Hao,Xinlei Li,Han Zhang,Peiqing Wang,Chengze Yin,Bo Li,Xinliang Wang
The strength-ductility trade-off severely limits the extensive application of particle-reinforced aluminum matrix composites mainly owing to the critical issues of local particle agglomeration and poor interfacial characteristics. The present work concentrates on these intractable puzzles and proposes Mg-Ag microalloying TiB 2 /Al-4.5Cu composites fabricated by an optimized salt-metal reaction method and multistage heat treatment. The resulting microstructure evidence that this new tactic synergistically ameliorates the detrimental agglomeration of TiB 2 particles by Mg and Ag doped at the TiB 2 /α-Al interface， meanwhile promoting the formation of nanosized Ω-Al 2 Cu and σ-Al 5 Cu 6 Mg 2 phases. The mechanical property experimental results indicate that the Mg-Ag microalloyed TiB 2 /Al-4.5Cu composites exhibit an accredited combination of the tensile strength (ultimate tensile strength is 496.3 ± 15.0 MPa) and ductility (uniform elongation is 12.8 ± 1.4 %). We emphasize the reciprocal effect between TiB 2 particles and the precipitated phase associated with unrelaxed misfit strains. Close attention is also paid to the interface binding characteristics and semi-coherent interphase boundary to evaluate their contribution to the ductility. The microalloying strategy can potentially be applied to many other metal matrix composites and boost analogous approaches for designing ultrahigh yet ductile materials for technological applications.
研究领域:
材料科学
·
金属学
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产品关联
DOI
高影响因子
International Journal of Smart and Nano Materials
·
2022
·
IF 4
Yafei Pan,Lei Huang,Jiuxing Zhang,Yong Du,Fenghua Luo
BxC-TiB2 ceramic composites were fabricated via reactive spark plasma sintering using TiC and B as the raw materials. The impact of B/TiC mole ratios on the phase compositions, densification behaviors, microstructure, and mechanical properties of the ceramic composites were investigated. The results showed that the stoichiometry of ‘BxC’ could be tailored by changing initial boron content and the obtained B4.5C, B6.5C and B8.5C phases have the same crystal structure (R-3 m). The excess of B enhanced the reaction between TiC and B, which released a large amount of hot energy and promoted the densification of the composites. The TB8.5 composite sintered at 1900°C had the best comprehensive mechanical properties, with hardness and flexural strength of 40.36 GPa and 551 MPa, respectively. The formation of nano-sized TiB2 grains induced by reaction were beneficial for improving the mechanical properties of these composites.
研究领域:
材料科学
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机械工程
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 9
·5810-5824
·
IF 3.5
Shaoyin Wang,Jianqiang Bi,Guandong Liang,Linjing Qiao,Yao Yang,Hongyi Wang,Shuyong Liang,Jiacheng Rong,Chengjiao Che,Jilie Yuan,Yueguang Chen
The aim of achieving integration of lightweight, high strength, high-temperature resistant, and satisfactory electromagnetic (EM) wave absorption was successfully accomplished in the present study by synthesizing TiC–TiB 2 fibers reinforced Si 3 N 4 composites, which were pressureless sintered at 1650°C for 2 h. The preparation of TiC–TiB 2 fibers was conducted through a chloride-assisted carbothermic method. This work focused on investigating the effects of incorporating TiC–TiB 2 fibers on the mechanical properties and EM wave absorption characteristics of the composites. The 30 wt% TiC–TiB 2 /Si 3 N 4 composite displayed the bulk density of 1.89 g/cm 3 , bending strength of 93.11 ± 3.91 MPa, fracture toughness of 1.81 ± 0.10 MPa m 1/2 , minimum reflection loss of −38.87 dB, and effective absorption bandwidth of 1.43 GHz in the K u -band, respectively. The as-synthesized TiC–TiB 2 /Si 3 N 4 composites are promising candidates for EM wave absorbing load-bearing materials due to their outstanding mechanical properties and microwave absorption properties.
研究领域:
材料科学
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电磁工程
·
机械工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Shi-Pan Yin,Zhao-Hui Zhang,Xing-Wang Cheng,Tie-Jian Su,Zheng-Yang Hu,Qi Song,Hao Wang
Almost fully dense B 4 C-TiB 2 -SiC composite ceramics with high flexure strength and good fracture toughness were fabricated through in-situ reaction between B 4 C, Ti 3 SiC 2 and Si using spark plasma sintering method at a relatively low temperature of 1650 °C. The intergranular and intragranular structure containing nanoparticles with different phase were introduced into the composite ceramic. The nano and micro particles in the microstructure formed a multi-scale particles reinforced structure. The refined matrix grains and the multi-scale reinforcing particles had a synergetic effect on improving the mechanical properties of the composite ceramics. As a result, B 4 C-TiB 2 -SiC composite ceramic with 30 wt% (TiB 2 + SiC) exhibits low density and optimum mechanical properties with high flexural strength of 531.2 MPa, good fracture toughness of 5.77 MPa m 1/2 and moderate micro-hardness of 28.6 GPa.
研究领域:
材料科学
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陶瓷工程
·
复合材料
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产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 24
·5531-5538
·
IF 6.813
Hongliang Zhu,Roong Jien Wong,Xiangbowen Du,Leilei Du,Zhikang Jin,KaiCheng Qian,Junjie Song,Renhong Li,Wen Liu
Low-cost and highly active catalysts are attractive for catalysing formic acid (FA) dehydrogenation at room temperature. The PtNi alloy nanoparticles with the characteristic of lattice contraction and synergy effects were loaded on two-dimensional TiB2 by incipient-wetness impregnation. Compared to Pt/TiB2, the substitution of Ni reduces the amount of noble metal required, with the added advantage of significantly improving the catalyst activity by sixteen times. By investigating the various PtNi ratios, the Pt3Ni8/TiB2 (total metal loading = 2.0 wt%) catalyst was found to provide a low activation energy of 27.7 kJ mol−1 in 10.0 M FA aqueous solution at room temperature. This is the first example of using the alloy supported on TiB2 to achieve strong metal–support interaction (SMSI) to catalyse formic acid dehydrogenation at ambient temperature. XPS and TEM characterisation studies show that higher temperatures induced TiB2 to encapsulate the PtNi NPs, with the TiB2 surfaces serving as the active site for catalysing FA dehydrogenation. The catalytic activity of the obtained Pt3Ni8/TiB2 catalyst for the dehydrogenation of FA was much higher than those of its monometallic counterparts (Pt/TiB2 and Ni/TiB2) prepared by the same method, while demonstrating higher stability against agglomeration and CO poisoning. The excellent catalytic activity and stability of Pt3Ni8/TiB2 were mainly attributed to the presence of the SMSI effect of the catalyst. Additionally, the lattice distortion and local interactions within the ferromagnetic clusters of Pt3Ni8 alloy NPs created a synergistic effect, which resulted in an enhanced SMSI effect throughout the catalyst. This study introduces a new concept that magnetic Ni metal partially replacing noble metals can improve thermal stability and catalytic performance, while enabling facile catalyst recovery. Moreover, this research demonstrates that the controlled synthesis and rational design of 2D reticular crystal structure TiB2-supported alloy NPs may provide new opportunities to enhance the catalytic activity and improve the SMSI effect of noble metal-based nanostructures.
研究领域:
催化
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材料科学
·
化学工程
·
纳米技术
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zongyi Deng,Xueyuan Yang,Xiaobo Yu,Zhixiong Huang,Di Zhu,Minxian Shi
Carbon fiber/phenolic resin composites (CF/Ph) have attracted great interests in the field of thermal protection materials for their characteristics of high specific strength and easy manufacturing. However, CF/Ph are inherently susceptible to oxidation failure at elevated temperatures. In this study, a novel Al-coated carbon fiber/boron phenolic resin ceramizable composite modified with TiB 2 and B 4 C was fabricated by an impregnating and compression molding route. Thermal stability, flexural strength , microstructure and phase evolution of the resulting ceramizable composite were studied. The residue yield at 1400 °C and flexural strength after treated at 1400 °C for 15min was 90.4% and 53.1 MPa, respectively, which was increased by 15.9% and 532.1% than that without ceramizable fillers. Surface defects generated by matrix pyrolysis were well healed, and PyC and carbon fibers were covered with dense ceramic layers while the fracture surface was covered with relatively continuous ceramic layers without visible pores. Multiphase ceramics composed of TiB 2 , TiO 2 , TiC and PyC were identified. Furthermore, oxidation failure and anti-oxidation mechanism was revealed based on the aforementioned characterizations and thermodynamic calculation results. Oxidation resistance got enhanced markedly for synergistic effects of oxygen consuming, carbon fixation, oxygen barrier and endothermic effect, which were derived from ceramization reactions between TiB 2 , B 4 C, O 2 , Al and PyC.
研究领域:
材料科学
·
热防护材料
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）