Polymers
·
2026
·Vol. 18
·期 10
·1258
·
IF 5.8
Xiaobo Wan,Kaizhen Wan,Dongmei Zhao,Yiming Liu,Wenjing Cao,Zongyi Deng,Jian Li,Zhixiong Huang,Minxian Shi
This research developed a ZrSi2-TiB2-modified alumina fiber/boron phenolic resin ceramizable composite intended to fulfill the criteria for high-temperature resistance, oxidation resistance, and structural load-bearing capacity in reusable thermal protection systems. The composite exhibits a low thermal conductivity of 0.405 W·m−1·K−1, a reduced density of 2.11 g·cm−3, and a high mass retention rate of 89.45% after heat treatment at 1200 °C in air. During thermal cycling at 1200 °C with a 30 min dwell time, it consistently demonstrates excellent stability, mass retention, and mechanical properties, indicating its potential for applications in reusable thermal protection systems. Following 20 cycles, the variation in length and width remains below 0.6%, the mass retention surpasses 80%, and the flexural strength remains above 20 MPa after 15 cycles. Microstructural evolution and thermodynamic analysis disclose that the in situ ceramization reaction of ZrSi2and TiB2consumes oxygen, inhibits oxygen diffusion, and fills pores and microcracks with oxidation products (SiO2and B2O3), thereby forming self-healing and densifying phases. This synergistic mechanism of self-healing and densification ensures the reusability of the composite. The research illustrates the performance evolution patterns and strengthening mechanisms of the composite under extreme thermal conditions, confirming its outstanding performance in repeated usage evaluations.
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DOI
PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2025
·
IF 10.5
Wenying Cui,Wenjiao Li,Chenggang Liu,Cheng Yao,Chan Song
Dopamine (DA) is a critical catecholamine neurotransmitter in the human body, making its assay highly significant for clinical diagnosis. In this study, two-dimensional (2D) oxygen-terminated TiB 2 nanosheets (NSs) were synthesized and characterized, exhibiting remarkable oxidase-like activity. These oxygen-terminated TiB 2 NSs can directly catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to oxTMB without requiring external oxidants such as H 2 O 2 or partially reduced oxygen (PROS). Interestingly, DA was found to effectively reduce the amount of oxTMB in the catalytic system. Based on this unique catalytic mechanism, a colorimetric sensor for DA detection was developed. The presence of antioxidants such as glutathione (GSH) and L-cysteine (L-Cys) in the samples failed to interfere the DA detection. It is contributed to the PROS-free catalytic mechanism of oxygen-terminated TiB 2 NSs and strong reduction ability of DA toward oxTMB. The sensing platform has a linear detection range of 0.1–8 μM with the detection limit (LOD) of 0.025 μM (3 σ / S ) and the quantification (LOQ) limit of 0.083 μM (10 σ / S ). Notably, oxygen-terminated TiB 2 NSs retained their high oxidase-like catalytic activity in the diluted real samples, highlighting their potential for biosensing applications.
研究领域:
纳米技术
·
生物分析
·
酶模拟
·
传感器
·
神经化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Yi Yang,Shifeng Wen,Qingsong Wei,Wei Li,Jie Liu,Yusheng Shi
The TiAl/TiB 2 metal matrix composites (MMCs) are fabricated by selective laser melting (SLM), and the effects of scan line spacing on the grains feature, crystallographic texture, phases evolution mechanism and nanohardness have been systematic studied. With the increase of scan line spacing, relatively coarse grains with average grain size of 4.9 ± 0.2 μm and strong ( 0001 ) orientation gradually transforms into refined grains with average grain size of 4.2 ± 0.1 μm and dominated ( 11 2 ¯ 1 ) and ( 01 1 ¯ 1 ) orientations during the SLM process. The SLM-processed TiAl/TiB 2 MMCs samples are dominated by high-angle grain boundaries (HAGBs) and α 2 phase, with the increase of scan line spacing from 80 μm to 140 μm, both the volume fraction of HAGBs and α 2 phase decrease. During the SLM process, the phases evolution mechanism of TiAl/TiB 2 MMCs can be expressed as: (200)β first transformed to (11 2 ¯ 0)α 2 , (20 2 ¯ 0)α 2 and (110)γ, then the TiB 2 , residual B 2 and incompletely transformed γ phases randomly distribute in the α 2 matrix, and the orientation relationship of the α 2 , γ, B 2 and TiB 2 phases can be concluded as: ( 11 2 ¯ 0 ) α 2 // ( 110 ) B 2 // ( 110 ) γ// ( 110 ) TiB 2 . Besides, there are some TiB phase in the TiAl/TiB 2 MMCs which is induced by the Ti + TiB 2 → 2TiB reaction during SLM. The TiAl/TiB 2 MMCs samples show an ultra-high nanohardness ranging from 8.6 ± 0.4 GPa to 9.4 ± 0.5 GPa with the increase of scan line spacing, which is superior than that of the TiB 2 reinforced TiAl alloy counterpart (6.7 ± 0.4 GPa) fabricated by traditional roll bonding.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Qi Song,Zhao-Hui Zhang,Zheng-Yang Hu,Shi-Pan Yin,Hao Wang,Xian-Yu Li,Xing-Wang Cheng
B 4 C is a structural ceramic , which is very sensitive to cracks and flaws. The present study aims to improve its mechanical performance using pre-oxidation process. The monolithic B 4 C ceramic and TiB 2 -SiC/B 4 C (B 4 C-TSC) composite ceramic were fabricated using spark plasma sintering technique, and they were pre-oxidized at 800 °C in the air. The effect of pre-oxidation time on microstructure and flexural strength was systematically investigated. The results indicated that 30 min was the optimum pre-oxidation time for both B 4 C ceramic and B 4 C-TSC ceramic. At this pre-oxidation time, the maximum flexural strength of 601.5 and 785.2 MPa were obtained for B 4 C ceramic and B 4 C-TSC ceramic, respectively. The improved flexural strength was primarily ascribed to the formation of glassy oxide layer during the pre-oxidation process and, in turn, the crack healing effect on the surface of the ceramics. Further increasing pre-oxidation time reduced flexural strength due to the pore formation induced by a large amount of CO gas and an intensive evaporation of B 2 O 3 glass phase.
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DOI
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
C. Jiang,X. Wang,X. Xiao,M. Piao,Y. Jia,J. He,L. Hu,Y. Zou,L. Sun,L. Chen
Chemical complex borohydride is a promising hydrogen storage material due to its large gravimetric and volumetric hydrogen capacities. However, the high dehydrogenation temperature and sluggish kinetics still place strong restrictions on its practical application in the hydrogen storage field. In this work, a synergetic approach of partial cation substitution and catalysis is developed to enhance the hydrogen storage properties of LiBH 4 . The Li/Mg based dual-cation borohydride (LiMg 2 (BH 4 ) 5 , LMBH) was successfully synthesized by wet chemical ball milling of LiBH 4 and MgCl 2 . The optimal (LMBH (4.5:1) sample, LiBH 4 and MgCl 2 in molar ratios of 4.5:1, possesses a maximum hydrogen desorption capacity (11.27 wt%) and the outstanding initial decomposition temperature (∼250 °C). Importantly, the LMBH (4.5:1) doped with TiF 3 shows a remarkable onset dehydrogenation temperature as low as 97.2 °C, which is about 190 °C lower than that of pristine LiBH 4 . The LMBH (4.5:1) doped with TiF 3 system releases 7.98 wt% H 2 within 170 min below 350 °C. And the dehydrogenation product of doped composite can reversibly absorb ∼4.72 wt% H 2 at a relatively moderate temperature of 280 °C, which is substantially lower than the reversible hydrogen absorption temperature of previous modified borohydride systems. Based on the structural characteristic analyses, the TiF 3 reacts with LMBH (4.5:1) to in-situ form actual catalytic components of TiB 2 and TiH 2 as the actual catalysts for LMBH (4.5:1), resulting in the improved hydrogen re/dehydrogenation properties. The synergetic modification of Li/Mg dual-cation substitution and TiB 2 /TiH 2 catalysis may lead to the development of light-metal borohydrides with outstanding hydrogen storage properties.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
ACTA MATERIALIA
·
2017
·
IF 5.301
Wei Li,Yi Yang,Jie Liu,Yan Zhou,Ming Li,Shifeng Wen,Qingsong Wei,Chunze Yan,Yusheng Shi
TiAl/TiB 2 in-situ metal matrix composites (MMCs) with greatly enhanced nanohardness are prepared via selective laser melting (SLM) for the first time in this study. The effect of TiB 2 reinforcement on the microstructural characteristics , texture evolution and phase transformation of TiAl-based alloy is investigated. The results show that with increasing the TiB 2 content, the average grain size gradually decreases, and the crystallographic orientation transforms from a strong ( 0001 ) direction to ( 10 1 ¯ 1 ) and ( 11 2 ¯ 1 ) directions. Meanwhile, TiB 2 has a great effect on the texture of SLM-processed TiAl/TiB 2 MMCs. With increasing the TiB 2 content, more textured TiAl/TiB 2 MMCs can be produced. The TiAl/TiB 2 MMCs are dominated by α 2 phase and small amounts of γ, B 2 , TiB 2 and TiB phases are also detected. α 2 phase contains the most important texture components of prismatic fiber with { 10 1 ¯ 0 } < 11 2 ¯ 0> orientation, basal fiber with { 0001 } < 11 2 ¯ 0> orientation and pyramidal fiber with { 10 1 ¯ 1 } < 11 2 ¯ 0> and { 11 2 ¯ 2 } < 11 2 ¯ 3 > orientations. The TiB 2 reinforcements are in the forms of the needlelike micro-TiB 2 and irregular nano-TiB 2 particles in the TiAl-based alloy matrix, and the nano-TiB 2 particles are uniformly distributed with the size of 10 nm in length and 3–5 nm in width. The SLM-produced TiAl/TiB 2 MMCs exhibit superior nanohardness of 10.57 ± 0.53 GPa, which is much higher than those of the traditional roll bonding fabricated TiB 2 reinforced TiAl-based alloy. The findings would be a valuable reference for fabricating TiAl/TiB 2 MMCs parts with controlled grain features, crystallographic texture and phase composition, enhanced mechanical properties and complex structures by SLM.
研究领域:
材料科学
·
增材制造
·
金属基复合材料
·
物理冶金
·
力学性能
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DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2024
·Vol. 8
·期 1
·1-19
·
IF 23.2
Liu Yang,Deng Zongyi,Zhang Wei,Jiang Guoqin,Cao Wenjing,Huang Zhixiong,Shi Minxian,Li Jian
Lightweight ablative materials are commonly utilized as thermal protection materials for hypersonic vehicles. Ceramizable phenolic aerogel/carbon fiber (PA/CF) composites modified with TiB 2 and B 4 C were fabricated, which had the characteristics of lightweight, high strength, and low thermal conductivity. The acid-catalyzed phenol-aldehyde polymerization reaction was used to significantly shorten the gelation time, which facilitated the uniform distribution of ceramic fillers. The oxygen-consuming, oxygen-blocking, and carbon-fixing synergistic effects of TiB 2 and B 4 C high-temperature ceramic reactions, as well as the multiphase ceramic structure (C-B 2 O 3 -TiO 2 -TiC) formed, conferred excellent thermal stability (the residual weight of 58.8% at 1200 °C), oxidation resistance (the residual strength of 3.44 MPa after static ablation), and ablation resistance (the linear and mass ablation rates as low as 0.045 mm/s and 0.0115 g/s) on the composites. The lightweight, high-strength materials with anti-thermal insulation properties demonstrate significant competitiveness and application potential in the field of thermal protection.
研究领域:
材料科学
·
航空航天工程
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产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Chuanyao Dong,Ruiyan Li,Jia Wang,Tao Zhou,Jingjie Pan,Jingsan Xu,Mao Wen,Yanguo Qin,Kan Zhang
Joint replacement surgery, essential for managing joint diseases, requires improvements in tribocorrosion performance to ensure surgical success and longevity of joint implants. Transition-metal light-element (TMLE) compound coatings, known for their high hardness and chemical stability, have been extensively researched and applied for surface protection of joint implants. However, these coatings typically lack a lubrication phase, leading to high friction coefficients and severe corrosion wear, which makes long-term effective protection challenging. A promising approach is to utilize the natural lubricating proteins present in body fluids, which are continuously available and can thus address long-term service issues of TMLE coatings. In this work, we utilized micro-arc oxidation (MAO) technology to develop an underlying morphology, then conformally deposited a TiB 2 layer, resulting in a cratered dual-layer TiB 2 /MAO coating. This unique cratered dual-layer structure not only preserves the high hardness and wear resistance of TiB 2 but also aims to (1) absorb wear particles to prevent abrasive wear and (2) increase surface energy to optimize protein lubrication capacity. Consequently, the TiB 2 /MAO coating exhibits low friction coefficients and wear rates in protein-containing simulated body fluids. Furthermore, the dual-layer TiB 2 /MAO coating demonstrates excellent corrosion resistance and biocompatibility. This dual-layer coating design synergistically combines the superior intrinsic properties of material with unique structural construction, while also harnessing continuously available external proteins as lubricants to further optimize performance, thereby introducing an advanced strategy for developing protective coatings for implant materials.
研究领域:
材料科学
·
生物医学工程
·
表面工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Xu Huang,Xuezhang Xiao,Xuancheng Wang,Zhendong Yao,Jiahuan He,Xiulin Fan,Lixin Chen
Li–Mg–B–H reactive hydride composite (RHC) has attracted extensive attention over the past decades for its extremely high hydrogen storage capacity (11.5 wt%). But the sluggish desorption kinetics for the second step dehydrogenation reaction need to be further improved. Herein, short rod-like TMTiO 3 (TM = Co, Ni) bimetallic oxides , which contain two kinds of transition metal elements, were synthesized and introduced into Li–Mg–B–H RHC for the first time. The NiTiO 3 exhibits excellent catalytic effect on the hydrogen desorption kinetic performance of Li–Mg–B–H RHC, and the incubation period for the second step dehydrogenation reaction is eliminated completely by reducing the apparent activation energy for the generation of MgB 2 from 296 kJ/mol to 269 kJ/mol. The NiTiO 3 doped Li–Mg–B–H RHC can desorb about 9.0 wt% H 2 without obvious attenuation of kinetic performance in five cycles. Mechanism analyses reveal that the in-situ generated nano-sized MgNi 3 B 2 and TiB 2 species (∼5 nm) both meet the critical value ( < 10%) of the edge-to-edge matching model (5.77% for MgNi 3 B 2 and 2.22% for TiB 2 ), which play a significant role in supporting the nucleation of MgB 2 . Meanwhile, the extremely fine MgNi 3 B 2 and TiB 2 heterogeneous nucleation sites can inhibit the excessive growth for a single crystal nucleus of MgB 2 . The heterogeneous nucleation and grain refinement mechanisms caused by the novel bimetallic oxide could provide alternative insights into designing an in-situ generated nano-sized catalytic hydrogen storage system with enhanced kinetics and cyclic stability for hydrogen-fueled applications.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2025
·
IF 4.6
Xianrui Zhao,Mengxian Zhang,Zhanjiang Li,Yangyang Zhao,Xunbai Du,Yunsong Cui,Qiangyong Zhang,Serhiy Serbin
TiB 2 -reinforced ultrafine Ti(C,N)-based cermets are fabricated via reactive spark plasma sintering. This study investigates the effect of carbon sources on the sintering processes, microstructures, and mechanical properties of cermets derived from a Co-Ni-Y-Ti-BN-WC-VC-Mo 2 C-TaC-C system. Results reveal that the sintering process involves both solid-state reactions and liquid-phase sintering stages. Compared to graphitic graphite and graphene, amorphous carbon black and nanocarbon exhibit higher reactivity and smaller particle sizes. This characteristic inhibits the Co Ti and Ti Ni reactions but promotes the Ti-BN reaction, thereby reducing the shrinkage rate during the solid-state reaction stage. During the liquid-phase sintering stage, carbon dissolves into the molten metal and subsequently diffuses into preformed TiN to create Ti(C,N). The use of carbon black and nanocarbon facilitates greater consumption of carbon. Consequently, there is an increase in shrinkage rate during this stage, a reduction in residual carbon within the final sintered samples, and an enhancement in relative density. Moreover, C atoms present in the liquid phase would promote the diffusion of heavy metals into Ti(C,N). When graphite or graphene is used as a source of carbon, Ti(C,N) with a black core/Gy rim structure is obtained. In contrast, employing carbon black or nanocarbon encourages the diffusion of heavy metals toward the center of Ti(C,N). This behavior contributes to the achievement of weak core/rim-structured Ti(C,N) and coreless solid solution particles with finer particle sizes, respectively. As a result of these processes, the synthesized cermet attains an optimal hardness of 2145 HV and K IC of 7.67 MPa·m -1/2 , along with a minimal wear depth of 8.19 μm.
研究领域:
材料科学
·
力学
✓ 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）