ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Zhen Huang,Rui Lin,Renjie Fan,Qinbai Fan,Jianxin Ma
Carbon support corrosion of traditional Pt/C catalyst is one of the major contributors causing poor durability of proton exchange membrane fuel cells (PEMFC). Titanium diboride (TiB 2 ) has high electrical conductivity and considerable chemical stability, which making it as a good candidate for catalyst support in PEMFC. In this work, TiB 2 was pretreated by different acid and alkali. The as-obtained samples were characterized by Ex-situ microscopy (ESM) and X-ray diffraction (XRD). The pore size distribution (PSD) was analyzed by using DFT method. The PSD shows distinct volume in mesopore regions (less than 50 nm). The TiB2 pretreated by H 2 O 2 shows the biggest BET surface area of 57 m 2 g −1 and its PSD focus on mesoporous (1.5-8 nm) region, which resulted to high dispersion and better loading of Pt particles. The Hydrogen oxidization reaction (HOR) and oxygen reduction reaction (ORR) activity was characterized by Rotating Disk Electrode (RDE). The Pt/TiB 2 prepared by H 2 O 2 -pretreated TiB 2 using the colloidal method showed better half-cell electrochemical performance. Facile synthetic for the development of Pt/TiB 2 catalysts was developed.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 21
·18307-18319
·
IF 2.22
Liu Xiongzhang,Luo Hui,Li Yingrui,Chen Fu,Wang Xian,Gong Rongzhou
Titanium boride (TiB 2 ) particles and fibers were synthesized by the carbothermal method with different calcination temperatures and time. Subsequently, the effects of calcination temperatures and time on microstructure and the yield of TiB 2 fibers were investigated. Further, the dielectric and microwave absorption (MA) properties of TiB 2 /paraffin composites within 2–18 GHz were discussed. As a result, the yield of TiB 2 fibers reached a maximum at 1400 °C for 180 min. The content of TiB 2 was directly proportional to permittivity. The sample containing 80 wt % TiB 2 particles and fibers indicated that the minimum reflection loss ( RL min ) attained − 46.5 dB at 11.6 GHz when the thickness was 1.45 mm and the effective absorption bandwidth (EAB) was 4.64 GHz ( RL <–10 dB) with the thickness of 1.25 mm. The related MA mechanisms were also discussed. The excellent stability, simple production procedure, thin absorbing layer, and wide EAB make TiB 2 become an ideal candidate for microwave absorbing materials applied in high temperatures.
研究领域:
材料科学
·
电磁学
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Qingke Wang,Qin Wang,Yanqiang Wei,Jingyu Chen,Tangyin Cui,Haibo Yan,Jinzhe Duan,Kai Li,Jie Ding
In this study, two types of high-temperature adhesives were prepared using molybdenum-modified phenolic resin (MoPF) as the matrix and TiB 2 or TiB 2 /ZrSi 2 particles as active fillers for bonding Al 2 O 3 ceramic substrates. Shear strength testing, thermo gravimetric analysis (TGA), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) were employed to investigate the bonding properties, thermal properties, microstructure, compositional evolution, and bonding mechanism of the adhesives. The results demonstrate that MoPF-TiB 2 /ZrSi 2 adhesive exhibits superior bonding properties than MoPF-TiB 2 adhesive. It is noteworthy that the incorporation of ZrSi 2 can mitigate the internal stress induced by rapid volume expansion of the adhesive, and ensuring high density and mechanical strength through the generation of ZrB 2 and ZrTiO 4 , which effectively prevents the sudden decline in bonding performance beyond 1200℃. The mechanical strength of the adhesive can still be maintained at 31.5 MPa after treatment at 1400℃.
研究领域:
材料科学
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粘合技术
·
陶瓷工程
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高影响因子
MATERIALS SCIENCE-POLAND
·
2020
·Vol. 38
·期 3
·502-507
·
IF 0.911
Meihua Hu,Ning Bi,Mingming Liu,Guangjin Gao,Shangsheng Li,Taichao Su
The improved TiB2 ceramics were obtained in sintering process at the pressure of 5.5 GPa and temperature of 1550 °C in presence of metallic Co powder. The effect of Co content (ranging from 0 wt.% to 10.0 wt.%) on the phase composition, density, microstructure, Vickers hardness and thermal conductivity of TiB2 ceramics was analyzed. A small amount of new phase Co2B has been created in the reaction of TiB2 and Co. The relative density of sintered TiB2 ceramics reached 98.1 %. When the mass fraction of Co increased, the porosity increased, while the hardness first increased and then decreased. The maximal Vickers hardness values were equal to 33.3 GPa or 28.2 GPa when the used load was of 4.9 N or 9.8 N, respectively. The highest reached value of thermal conductivity was 88.9 W˙m−1 ˙ K−1. The dense TiB2 ceramics with improved hardness and thermal conductivity were ascribed to the high pressure sintering method and Co sintering aid. High pressure sintering method provides a new way for the preparation of ceramics materials.
研究领域:
材料科学
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陶瓷工程
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高影响因子
Defence Technology
·
2025
·
IF 5.9
Dunhui Xu,Yue Jiang,Siyi Zhang,Wang Han,Changlu Zhao,Lijun Yang
Thermite is widely utilized in fields such as munitions, propulsion, welding, and materials synthesis. In particular, boron (B)-based thermites have shown promising thermochemical properties due to the high energy densities of B. However, challenges such as high ignition temperature and low combustion efficiency of B particles have hindered their broader application. To enhance the heat release performance of B-based thermites, this study introduces a novel boride fuel, titanium diboride (TiB 2 ), and experimentally compares the thermal oxidation and combustion characteristics of TiB 2 /CuO thermite and conventional B/CuO thermite under both slow heating and laser-induced fast heating conditions. Results demonstrate that TiB 2 /CuO thermite showed better ignition and combustion performance than B/CuO thermite. Under the optimal fuel-rich condition (Φ = 2), the ignition delay time of TiB 2 /CuO thermite is reduced by 57.7% compared with B/CuO thermite. Moreover, due to the high reactivity of TiB 2 and the catalytic action of TiO x , the flame temperature and radiation intensity of TiB 2 /CuO thermite are significantly higher than that of B/CuO thermite during intense combustion. The onset reaction temperature decreased from 537 °C for B/CuO thermite to 422 °C for TiB 2 /CuO thermite. Characterization of the combustion products indicates that TiB 2 /CuO thermite reaction produces distinctive hollow TiO 2 shells and ‘pocket-like’ structures. Finally, mechanistic analysis proposes two pathways for TiB 2 /CuO: complete combustion forming hollow shells driven by B oxide vaporization, and incomplete combustion yielding porous agglomerates due to TiO 2 encapsulation. These findings highlight TiB 2 /CuO’s superior combustion performance over B/CuO, offering fundamental insights and experimental support for optimizing high-energy thermite formulations.
研究领域:
含能材料
·
燃烧科学
·
材料化学
·
推进技术
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高影响因子
Chinese Physics B
·
2021
·Vol. 30
·期 3
·038105
·
IF 1.494
Jingzhe Fan,Weixia Shen,Zhuangfei Zhang,Chao Fang,Yuewen Zhang,Liangchao Chen,Qianqian Wang,Biao Wan,Xiaopeng Jia
By doping titanium hydride (TiH2) into boron carbide (B4C), a series of B4C + x wt% TiH2 (x = 0, 5, 10, 15, and 20) composite ceramics were obtained through spark plasma sintering (SPS). The effects of the sintering temperature and the amount of TiH2 additive on the microstructure, mechanical and electrical properties of the sintered B4C-TiB2 composite ceramics were investigated. Powder mixtures of B4C with 0–20 wt% TiH2 were heated from 1400 °C to 1800 °C for 20 min under 50 MPa. The results indicated that higher sintering temperatures contributed to greater ceramic density. With increasing TiH2 content, titanium diboride (TiB2) formed between the TiH2 and B4C matrix. This effectively improved Young's modulus and fracture toughness of the composite ceramics, significantly improving their electrical properties: the electrical conductivity reached 114.9 S⋅cm−1 at 1800 °C when x = 20. Optimum mechanical properties were obtained for the B4C ceramics sintered with 20 wt% TiH2, which had a relative density of 99.9 ± 0.1%, Vickers hardness of 31.8 GPa, and fracture toughness of 8.5 MPa⋅m1 / 2. The results indicated that the doping of fine Ti particles into the B4C matrix increased the conductivity and the fracture toughness of B4C.
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
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2024
·
IF 4.2
Dezhi Wang,Ningyuan Xing,Kai Li,Ye Gao,Yanzhen Lu,Zhuangzhi Wu
To meet the high demand of tungsten alloy matrix wires for photovoltaic slicing, new high performance tungsten composites are explored and the effect of various Ti-based additives on the mechanical properties of tungsten is systematically discussed as well as the corresponding strength improvement mechanism. It is found that the W-TiB 2 exhibits the best mechanical properties with an ultimate tensile strength of 292.3 MPa and a compressive strength of 2370 MPa (a strain of 35%), approximately 96.1% and 28.5% higher than those of pure tungsten, respectively. Besides, the TiB 2 additive also triggers a slight toughening with a transgranular fracture . The enhanced strength should be attributed to the reaction between TiB 2 and adsorbed/dissolved oxygen, in which a new second phase of TiO 2 is generated with a small amount of Ti elements solidly dissolved into the W matrix, resulting in enhanced binding ability among grain boundaries and distorted lattices.
研究领域:
材料科学
·
机械工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Shujie Yu,Xin Li,Bangwei Ye,Guomei He,Jiangxi Chen
To meet the demand of advanced space exploration technologies, ultra-high temperature ceramics (UHTCs) have emerged as advanced materials for applications under extreme conditions. In particular, TiC–TiB 2 –SiC ceramic nanocomposites synthesized using the polymer-derived ceramic approach stand out as promising UHTCs. However, the complex synthesis procedures and high material costs associated with some of the precursors limit their practical scalability. In this study, TiC–TiB 2 –SiC ceramic nanocomposites were successfully prepared from a newly developed single-source precursor (named TBS ) using tetrabutyl titanate (Ti(OBu) 4 ), phenylboronic acid (PhB(OH) 2 ), and diphenyl dimethoxysilane (Ph 2 Si(OMe) 2 ) as common and inexpensive starting materials. Notably, the use of Ph 2 Si(OMe) 2 instead of costly starting materials for the synthesis of SiC-based ceramics has been rarely reported. The structural evolution during the polymer-to-ceramic conversion was studied via Fourier transform infrared spectroscopy, and phase and chemical composition evolution were investigated using X-ray diffraction (XRD). In situ generated nanoscale TiC–TiB 2 –SiC multiphase ceramics were detected via XRD at annealing temperatures above 1300 °C. In the nanocomposites annealed at 1800 °C, the average grain sizes of TiC, TiB 2 , and β-SiC were 55, 35, and 63 nm, respectively. High-resolution transmission electron microscopy (HRTEM) analysis of the microstructures of the obtained ceramic nanocomposites further confirmed the formation of nanoscale TiC, TiB 2 , and β-SiC.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Qian Kou,Chuntao Ge,Junjie Xu,Wenjuan Qi,Weiliang Jin,Ping Wang,Jun Zhang,Hongmin Zhu,Saijun Xiao
TiB 2 -coated cemented carbide cutting tools perform excellently in machining difficult-to-process metals such as titanium and aluminum alloys. We fabricated TiB 2 coatings on cemented carbides using molten salt electrophoretic deposition, consisting of in-situ synthesis of TiB 2 nanoparticles by borothermal reduction of TiO 2 in NaF-AlF 3 molten salts and subsequent electrophoretic deposition of the as-synthesized TiB 2 nanoparticles to form TiB 2 coatings in the same molten bath. This technique prepares a fully dense TiB 2 coating with a thickness of approximately 60 μm on a WC-8wt% Co substrate, exhibiting high hardness (36.7 GPa) and adhesion strength (48 N). Moreover, tribological property testing indicates that it possesses a lower coefficient of friction (0.55) and wear rate (8.69 × 10 −7 mm 3 /(N∙m)) compared with those of WC-8wt% Co substrate(coefficient of friction, 0.58; wear rate, 9.14 × 10 −7 mm 3 /(N∙m)).
研究领域:
材料科学
·
表面工程
·
电化学
·
制造工程
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DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 4
·557
·
IF 4.7
Qingke Wang,Jiadong Tao,Huawei Shan,Tangyin Cui,Jie Ding,Jianghang Wang
In this study, a heat-resistant adhesive was prepared using molybdenum-phenolic (Mo-PF) resin as the matrix and TiB2particle as the ceramizable filler for bonding Al2O3ceramic substrates. Firstly, Fourier transform infrared (FTIR) was used to characterize the chemical structure of the Mo-PF. Subsequently, thermo gravimetric analysis (TGA) and shear strength testing were employed to investigate the effects of heat treatment in different atmospheres on the thermal stability and residual bonding properties of the adhesive. To further explore the bonding mechanism of the adhesive after heat treatment in different atmospheres, scanning electron microscopy (SEM), compressive strength testing, and X-ray diffraction (XRD) were utilized to analyze the microstructure, mechanical strength, and composition evolution of the adhesive at different temperatures. The bonding strength of Al2O3joints showed a trend of initially decreasing and then increasing after different temperature heat treatment in air, with the shear strength reaching a maximum value of 25.68 MPa after treatment at 1200 °C. And the bonding strength of Al2O3joints decreased slowly with the increase of temperature in nitrogen. In air, the ceramicization reaction at a high temperature enabled the mechanical strength of the adhesive to rise despite the continuous pyrolysis of the resin. However, the TiB2filler in nitrogen did not react, and the properties of the adhesive showed a decreasing tendency with the pyrolysis of the resin.
研究领域:
材料科学
·
化学工程
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 18
·25895-25900
·
IF 4.527
Daimeng Chen,Kuibao Zhang,Jianjun Zeng,Haiyan Guo,Bo Li,Baozhu Luo,Xuegang Huang
In this study, TiB 2 –B 4 C composite ceramics were prepared using Y 2 O 3 and Al 2 O 3 as the sintering aids . Different contents of B 4 C were added to seek promoted comprehensive mechanical properties of the composites. The mixed powders were sintered at 1850 °C under a uniaxial loading of 30 MPa for 2 h via hot-pressing. Through the measurement of XRD, SEM and related mechanical properties, the influence of B 4 C content on the microstructure and mechanical properties of TiB 2 –B 4 C composites ceramics was discussed. The experimental results show that TiB 2 –B 4 C composite ceramics exhibit excellent mechanical properties, which can be attributed to the dense microstructure and fine grain size . In addition, TiB 2 –B 4 C composite ceramic shows a relatively high comprehensive properties when the addition amount of B 4 C is 20 wt%. The relative density, Vickers hardness , fracture toughness and flexural strength are measured to be 99.61%, 27.63 ± 1.73 GPa, 4.77 ± 0.06 MPa m 1/2 , 612.5 ± 28.78 MPa, respectively.
研究领域:
材料科学
·
陶瓷
·
机械工程
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DOI
高影响因子
Journal of Macromolecular Science Part B-Physics
·
2026
·
IF 1.7
Zheng Wei,Chaopeng Zhao,Long Zhang,Rui Chen,Dizhi Liu,Huadong Fu,Yan Qin
Sprayable polyurethane elastomers integrate outstanding mechanical properties with excellent adhesion, enabling firm bonding to diverse materials such as metals. However, their inadequate high-temperature resistance and inherent flammability restrict their application in extreme environments. This study incorporated silica (SiO2) and montmorillonite (MMT) to optimize the compatibility between inorganic ceramic particles and the polymer matrix. Titanium boride (TiB2) and silicon carbide whiskers (SiCw) were employed as ceramicized fillers, with aramid pulp added as a dispersion-strengthening phase, successfully developing a ceramicizable polyurethane-based thermal insulation material. The results demonstrated that when both TiB2 and SiCw were added at 1.2 g, the composite achieved optimal comprehensive performance: tensile strength increased from 5.14 MPa to 6.34 MPa, mass retention at 1000 °C reached 30.50%, and after oxygen-acetylene ablation testing, the linear ablation rate was 0.180 mm/s with a mass ablation rate of 0.0706 g/s. Multiple characterization revealed that graphitic carbon derived from polyurethane pyrolysis, molten SiO2 at elevated temperatures, and oxidation decomposition products of TiB2 (such as TiO2 and B2O3) collectively formed a multi-phase ceramic-glass composite. This composite effectively fills voids generated in the material under high-temperature conditions, densifies the carbon layer structure, and significantly enhances the ablation resistance of polyurethane elastomer thermal insulation materials.
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高影响因子
危险品化学品经营许可证（带存储）