JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Qianglong He,Shi Tian,Jingjing Xie,Cuili Xiang,Hao Wang,Weimin Wang,Zhengyi Fu
B 6.5 C-TiB 2 -SiC-BN composite ceramics were prepared by a novel solid-state reaction using TiCN, B, and Si as raw materials. The final products obtained by hot pressing at 1950 °C possessed a fine microstructure, homogeneous distribution, and excellent mechanical properties . The obtained bulk B 6.5 C-TiB 2 -SiC-BN composite ceramic shows a high relative density (98.8 %). The mechanical properties of the composites are anisotropic because of the orientation growth and structural characteristics of TiB 2 and h-BN grains. The values of hardness, bending strength , and fracture toughness measured along the hot-pressing direction were 19.6 GPa, 801 MPa, and 4.30 MPa m 1/2 , respectively, which were higher than those measured perpendicular to the hot-pressing direction. The formation of twin structures in B 6.5 C and SiC grains and the crack deflections induced by h-BN and TiB 2 grains are 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
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 21
·期 1
·438-450
·
IF 2.1
Bo Wang,Delong Cai,Shiqi Li,Haoyi Wang,Wenhua Zou,Zhihua Yang,Xiaoming Duan,Peigang He,Daxin Li,Wenjiu Duan,Yanzhi Pan,Yueqian Zhao,Dechang Jia,Yu Zhou
B 4 C–MAS and B 4 C–TiB 2 –MAS ceramic composites were prepared by hot pressed sintering. The effects of particle size of B 4 C and TiB 2 content on the microstructure and general mechanical properties of the ceramic composites were investigated by using X-ray diffractometer, scanning electron microscope, and universal testing machine. The strengthening and toughening mechanism of ceramic composites is mainly attributed to the addition of magnesium–aluminosilicate (MAS) and thermal mismatch effect of TiB 2 . When the TiB 2 content was 20 wt.%, the bending strength, fracture toughness, and Vickers hardness of B 4 C–TiB 2 –MAS ceramic composites were 375 MPa, 4.42 MPa·m 1/2 , and 23.9 GPa, respectively, and its relative density could reach 99.7%. The dynamic mechanical properties of B 4 C–TiB 2 –MAS ceramic composites were investigated at strain rates of 2000–6000 s −1 using a Separate Hopkinson Pressure Bar (SHPB) device. The results showed that the B 4 C–TiB 2 –MAS ceramic composites exhibited significant strain rate sensitivity. The dynamic compressive strength of the ceramic composites increased from 4634 to 5734 MPa with increasing strain rate in the tested strain rate range.
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 POWER SOURCES
·
2019
·
IF 7.467
Liming Jin,Jie Ni,Chao Shen,Fenglai Peng,Qiang Wu,Donghao Ye,Junsheng Zheng,Gaoran Li,Cunman Zhang,Zhoupeng Li,Jim P. Zheng
A metallically conductive TiB 2 is developed to construct multifunctional separator toward improved lithium-sulfur (Li–S) battery performance. Coupled with two-dimensional graphene, the obtained TiB 2 @G separator fulfills a synergistic combination of strong physical and chemical sulfur immobilization as well as a high-efficiency sulfur reutilization, thus establishing a robust barrier against the polysulfide shuttling and enabling a fast and durable sulfur electrochemistry . As a result, cells based on TiB 2 @G separator exhibit a high sulfur utilization with 1350 mA h g −1 capacity at 0.05C, superb rate capability up to 5.0C, and excellent cyclability with a high capacity retention over 85% after 300 cycles at 0.5C. Moreover, significantly mitigated self-discharge and considerably high areal capacity of 5.8 mA h cm −2 can be also achieved, indicating the great promise of this separator design for the development of high-performance Li–S batteries.
研究领域:
电化学
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能源材料
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纳米材料科学
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储能技术
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电池化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Chaoqun Zhu,Lukun Feng,Binbin Xu,Qingying Lin,Xiaoli Cheng,Jiangxi Chen,Guomei He
SiC–TiB 2 ceramic nanocomposites are valuable ultra-high temperature materials, which are rarely prepared from preceramic polymers. In this work, we synthesized SiC–TiB 2 nanocomposites from a new preceramic polymer called titanium- and boron-modified polycarbosilane ( TB–PCS ). The polymer structure was characterized by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance (NMR) spectroscopy. The structure, composition, and morphology of the resulting ceramic products were investigated by FT-IR, X-ray diffraction, and transmission electron microscopy . The elements of titanium and boron were incorporated into the preceramic polymer, and nanoscale TiB 2 and β-SiC grains generated in situ were detected in the pyrolyzed ceramic products at temperatures higher than 1400 °C. The new preceramic polymer presents a novel approach to preparing SiC–TiB 2 nanocomposites.
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
Materials Today Communications
·
2021
·
IF 3.383
Shi Tian,Wenchao Guo,Qianglong He,Aiyang Wang,Tian Tian,Chun Liu,Lanxin Hu,Zhixiao Zhang,Hao Wang,Weimin Wang,Zhengyi Fu
TiN–TiB 2 –hBN composite powders were synthesized by a nitride boronizing process using TiN and amorphous boron as the raw materials, and the reaction process of TiN–B powder mixture was investigated by heat treatment at elevated temperatures. At 1400 °C in a vacuum, TiN–TiB 2 –hBN composite powders with a core-shell structure of layered hBN-wrapped TiB 2 were obtained, which can be used to prepare ceramic composites with excellent properties. The results showed that B atoms began to diffuse into TiN and replace the N atoms to form TiB 2 at high temperature; then, the substituted N escaped outwards, and upon contacted with B, formed hBN at the surface of the TiB 2 particles. The relative density, bending strength , and fracture toughness of the 70 vol% TiN–17.6 vol% TiB 2 –12.4 vol% hBN (TB73) composite prepared by reactive sintering were 98.90%, 521 MPa, and 4.22 MPa m 1/2 , respectively, which were much higher than that of fabricated via conventional method (TBN73: 88.02%, 198 MPa, and 2.58 MPa m 1/2 ).
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
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Zihan Wang,Qianglong He,Shifeng Ren,Aiyang Wang,Weimin Wang
B 4 C–TiB 2 –graphite ceramic composites were fabricated via reactive hot pressing using B 4 C and TiC as the raw materials. With an increase in the TiC content, the grain size of B 4 C decreased continuously because B 4 C grain growth was inhibited by the TiB 2 and C reaction products. However, excessive TiC content caused an increase in TiB 2 and graphite grain size and the formation of TiB 2 –graphite agglomerates. When the composition of the ceramic composite was 95.1 wt%B 4 C–3.9 wt%TiB 2 –1.0 wt%graphite, the Vickers hardness and bending strength was optimized at 34.9 GPa and 688 MPa, respectively. The results showed that crack deflection is the main toughening mechanism of B 4 C–TiB 2 –graphite ceramic composites, and the effect of TiB 2 –graphite on crack propagation is particularly significant. When the composition of the ceramic composite was 75.6 wt%B 4 C–19.4 wt%TiB 2 –5.0 wt%graphite, the fracture toughness was optimized at 6.77 MPa·m 1/2 . These results provide guidelines on how to effectively control the combined properties of B 4 C–TiB 2 –graphite ceramic composites in future investigations.
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
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
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Shaoxiong Weng,Zongyi Deng,Zhixiong Huang,Minxian Shi,Yuzhan Lu
The carbon fiber (CF) reinforced boron phenolic resin (BPR) matrix composite, renowned for its exceptional ablation resistance, represents a promising material for high-temperature applications. However, hypersonic vehicles are subjected to increasingly challenging service environments, which necessitate materials capable of enduring even more extreme temperatures. Consequently, there is a growing need for composites that exhibit superior ablation resistance. To tackle these demanding requirements, this research initiative introduces the integration of ceramizable fillers, including TiB2, B4C, and ZrC, into the composite structure to create a high-temperature ceramizable system. The experimental findings indicate that the composites formulated with this innovative system demonstrate extraordinary ablation resistance, even when exposed to oxyacetylene flames with a heat flux of 4364 kW/m 2 . Notably, the measured linear ablation rate and mass ablation rate were recorded at −0.012 mm/s and 0.0268 g/s, respectively. These values are exceptionally low. Subsequent analysis utilizing X-ray diffraction (XRD) and additional characterization techniques has confirmed the formation of a dense ceramic layer with a B-C-O-Ti-Zr composition on the composite surface at elevated temperatures. This ceramic layer acts as a formidable barrier, significantly mitigating the ablation effects caused by high-temperature exposure. Meanwhile, it is pertinent to note that the formation of the ceramic layer is accompanied by an endothermic reaction, which consequently leads to a reduction in the thermal conduction of the composite to some extent.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Huijuan Qiu,Hongkang Wei,Shifeng Ren,Lingjun Sun,Jia Li,Zihan Wang,Haozhan Li,Lin Zhao,Jun Luo,Chang-an Wang
In this work, in situ formed TiB 2 -reinforced SiC ceramic composites were prepared by reactive hot pressing using SiC, TiC, B 4 C, and Si as raw materials. Phase composition, microstructure, and mechanical as well as electrical properties were investigated. The formation of the TiB 2 phase could be realized from the reaction among TiC, B 4 C, and Si. In the sintered SiC–TiB 2 ceramic composites, the content of α-SiC decreased while that of the in situ formed TiB 2 increased. In addition, residual Si only existed in the SiC–TiB 2 ceramic composites with in situ TiB 2 below 20 mol%. Notably, the comprehensive performance of the SiC–TiB 2 ceramic composites was enhanced with the increase of TiB 2 content due to the reduction of pores and residual Si. Finally, nearly fully dense SiC–TiB 2 ceramic composites were obtained when in situ formed TiB 2 was above 20 mol%. The SiC–TiB 2 ceramic composites, with in situ TiB 2 of 30 mol%, exhibited hardness of 26.9 ± 2.3 GPa, fracture toughness of 6.83 ± 0.6 MPa m 1/2 , and electrical resistivity of 0.3 mΩ cm, 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
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
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xueyuan Yang,Linxuan Li,Minxian Shi,Zhixiong Huang,Zongyi Deng
The inherent susceptibility to oxidation limits the application of carbon fibre/phenolic resin composites (CF/Ph) in the thermal protection of hypersonic vehicle engines. Herein, TiB 2 -B 4 C modified Al-coated carbon fibre/boron phenolic resin ceramizable composites were fabricated. The optimal ceramizable composite (T 30 C 10 ) exhibited excellent ablation resistance and high-temperature insulation capacity at a linear ablation rate and bottom-surface temperature of −0.00768 mm/s and 129.8 °C, respectively. Oxygen consumption and inhibition, carbon fixation, and self-healing effects contributed to the excellent ablation resistance, and the effects of the Al coatings and carbothermal reduction reactions led to excellent high-temperature insulation capacities.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 5
·056519
·
IF 1.62
Yanqing Xue,Qitang Hao,Bo Li,Xinliang Wang,Chengze Yin,Han Zhang
To surmount the longstanding puzzle of strength-ductility trade-off, efforts had been made to apply Mg - Ag microalloying on 5%TiB2/Al-4.5%Cu composites by in situ molten salt reaction and subsequent heat treatment. The obtained composites achieve an eye-catching tensile elongation (δ) of 6.1 ± 0.4%, while maintaining elevated ultimate tensile strength (UTS) of 497 ± 4 MPa and yield strength (YS) of 401 ± 3MPa. Comprehensive characterization demonstrated that the uniformly distributed TiB2 particles together with semi-coherent grain boundaries between the α-Al matrix and reinforcement phase (TiB2 particles, Ω-Al2Cu, σ-Al5Cu6Mg2) facilitated the dislocation motion integrally, which eliminated the stress concentrations, may be the main reason for amelioration in the strength-ductility trade-off of the composites when subject to rigorous multi-step heat treatment.
研究领域:
材料科学
·
冶金工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）