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
·
陶瓷工程
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Dexuan Yan,Jiahui Chen,Yu Zhang,Yanzi Gou
In this work, a new approach to fabricate B 4 C/SiC ceramic hollow microsphere was established through combination of slurry-coating and precursor conversion method. Firstly, different slurries were prepared using modified B 4 C powder with addition of PCS and LPCS. Subsequently, slurry was coated on a POM microsphere, followed by crosslinking, POM decomposition and heat-treatment at 1100 °C. Finally, the B 4 C/SiC hollow microspheres with average diameter of 1.6–1.9 mm and thickness of 10–60 μm were obtained. The roughness (Ra) of outer surface was as low as 40.3 nm with high sphericity of 99.6%. Deoxidation was also explored by heat treatment at 1700 °C. The oxygen content was decreased from 11.06 wt.% to 0.37 wt.%, and crush load was promoted from 1.73 N to 4.50 N. The preparative method of B 4 C/SiC ceramic hollow microspheres in this work can be easily extended for large-scale production.
研究领域:
材料科学
·
陶瓷制备技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Peisen Liu,Xueying Zhang,Yunjia Xue,Anran Guo,Liachen Liu
A heat resistance adhesive with wide operative temperature range for bonding alumina fiber fabric was developed by organic-inorganic modification. The polyvinyl alcohol modified by B 2 O 3 generated a complex cross-linked network connected by B–O–C bonds, which can enhance the bonding strength of adhesive after heat-treatment from RT to 400 °C. Moreover, the addition of B 4 C can enhance the bonding strength of adhesive after heat-treatment from 400 °C to 800 °C due to the formation of molten B 2 O 3 and borosilicate glass . Significantly, the appropriate addition of B 4 C can make the adhesive form a denser structure without transforming the fracture mode of the bonding joints, which is conducive to enhance the strength performance of bonding joints after sintered at 800 °C. On the contrary, the excessive addition of B 4 C will transform the fracture mode of the bonding joints into brittle fracture , which will degrade the strength performance of bonding joints.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Chaofeng Lv,Jincui Ren,Yuting Duan,Yisheng Wu,Xinyi Li
To improve the oxidation resistance of alumina–carbon refractories, SiO 2 –B 4 C-glass composite coating was prepared by slurry brushing method on the surface of refractories. Effect of SiO 2 content on the oxidation resistance of the coating was studied. Oxidation resistance mechanism and failure reason of the SiO 2 –B 4 C-glass coating were discussed. Results showed that introducing SiO 2 could increase viscosity activation energy and elevate the glass layer's viscosity at high temperature. With the increase of SiO 2 content, the glass viscosity at high temperature gradually increased. When SiO 2 content was too low, the glass exhibited smaller viscosity and larger fluidity, so the glass layer was easy to be washed away. When SiO 2 content was too high, the glass phase with high viscosity and low fluidity could not uniformly cover on the surface of alumina–carbon refractories. The composite coating with SiO 2 content of 55 wt% exhibited excellent oxidation resistance, which could effectively protect alumina–carbon refractories at 800 °C for 100 h with weight loss of only −1.721%. Excellent oxidation resistance of the coating mainly depended on the glass layer with good self-healing ability. With the extension of oxidation time, the coating thickness decreased, leading to the relatively poor self-healing ability and reduced weight gain rate of the coating.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2020
·
IF 16.602
Yukai Chang,Xiaohui Sun,Mengdong Ma,Congpu Mu,Penghui Li,Lei Li,Mengzhu Li,Anmin Nie,Jianyong Xiang,Zhisheng Zhao,Julong He,Fusheng Wen,Zhongyuan Liu,Yongjun Tian
B 4 C is widely known by a series of unique advantages, such as low density, high hardness, good chemical stability and excellent environmental stability, as a hard ceramic material. However, the study of B 4 C as the electrode material on micro-electrochemical energy storage devices has not yet been reported. To some extent, the poor conductivity of B 4 C is an important reason to limit its extensive application in energy storage field. Here, we first report an elaborated design B 4 C@C of core-shell structure by simple vacuum heating synthesis strategy as electrodes for flexible all-solid-state micro-supercapacitors (MSCs) with the method of mask assisted-vacuum filtration. Notably, the B 4 C@C-MSCs exhibit outstanding electrochemical performances, such as high areal capacitance of 7.33 mF cm −2 , remarkable cycling stability with 100.94% capacitance retention after 50000 cycles, wide operating temperature range (−25 to 75 °C), excellent mechanical flexibility without obviously performance degradation under different bending states, distinguished environmental stability and superior integration. These results suggest that the hard ceramic materials B 4 C have a promising prospect in micro-electrochemical energy storage devices.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2017
·Vol. 100
·期 7
·3099-3107
·
IF 2.841
Xiaorong Zhang,Zhixiao Zhang,Weimin Wang,Junhong Shan,Hongwei Che,Jingbo Mu,Guangsuo Wang
B 4 C–TiB 2 –SiC composites toughened by composite structural toughening phases, which are the units of (TiB 2 –SiC) composite, were fabricated through reactive hot pressing with B 4 C, TiC, and Si as raw materials. The units of (TiB 2 –SiC) composite with the size of 10-20 μm are composed of interlocking TiB 2 and SiC with the size of 1-5 μm. The addition of TiC and Si can effectively promote the sintering of B 4 C ceramics. The relative densities of all the B 4 C composites with different contents of TiB 2 and SiC are close to completely dense (98.9%-99.4%), thereby resulting in superior hardness (33.1-36.2 GPa). With the increase in the content of TiB 2 and SiC, the already improved fracture toughness of the B 4 C composite continuously increases (5.3-6.5 MPa·m 1/2 ), but the flexure strength initially increases and then decreases. When cracks cross the units of the (TiB 2 –SiC) composite, the cracks deflect along the interior boundary of TiB 2 and SiC inside the units. As the crack growth path is lengthened, the crack propagation direction is changed, thereby consuming more crack extension energy. The cumulative contributions improve the fracture toughness of the B 4 C composite. Therefore, the composite structural toughening units of the (TiB 2 –SiC) composite play an important role in reinforcing the fracture toughness of the composites.
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
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Xiaojie Zhang,Jipeng Yang,Tiancong Cai,Guoqiang Zuo,Changqing Tang
Boron carbide (B 4 C) nanoparticles-decorated anatase titanium dioxide (TiO 2 ) nanosheets photocatalysts were synthesized by a hydrothermal method in the presence of hydrofluoric acid and characterized by field emission scanning electron microscope, high-resolution transmission electron microscope, UV–vis diffuse reflectance spectra, photoluminescence spectra, etc. With metallic Pt nanoparticles as a co-catalyst, the as-synthesized B 4 C/TiO 2 composites were evaluated using photocatalytic CO 2 or H 2 O reduction to solar fuels such as methane and hydrogen. Under either simulated sunlight or visible light irradiation, coupling p-type B 4 C with n-type anatase TiO 2 significantly improved the photocatalytic performance. Both photoluminescence and transient photocurrent measurements indicated that the interfacial coupling effect between B 4 C and anatase TiO 2 could significantly promote photo-excited charges separations. On the basis of measurements and literatures, a possible mechanism of excited charges transfer at the B 4 C-anatase TiO 2 heterojunction interface during irradiation was deduced.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2021
·
IF 5.234
Yang Wang,Qiang Liu,Biao Zhang,Haoqian Zhang,Yicheng Jin,Zhaoxin Zhong,Jian Ye,Yuhan Ren,Feng Ye,Wen Wang
In this study, the researchers constructed nacre-inspired 2024Al/B 4 C composites with a lamellar-interpenetrated structure using pressured infiltration of alloy melt into freeze-cast B 4 C scaffolds, and investigated their dynamic and ballistic properties. The defects such as pores or cracks were hardly observed, and a few intermetallic compounds (IMCs) were contained within the alloy matrix. Because of strain-rate hardening and alloy matrix melting, the dynamic compressive strength and strain were greater than quasi-static ones. The dynamic response could be interpreted by a mixture rule according to B 4 C volume fraction, and by main fracture phenomena such as cracking of B 4 C and IMCs, alloy matrix deformation, and interfacial debonding. After the ballistic test, the nacre-like composites achieved enhanced impact resistance compared to conventional Al/B 4 C materials, while maintaining integrity rather than breaking destructively as monolithic Al/B 4 C composites did, which derived from multiple energy absorption mechanisms including crack deflection, ductile-ligament bridging, and pull-out behavior. This work opens a promising new avenue for the development of advanced armor systems.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lei Yu,Kuibao Zhang,Daimeng Chen,Baozhu Luo
TiB 2 -B 4 C composites modified by SiC W with excellent mechanical properties were prepared using hot-press sintering. The effects of SiC W content on the microstructure, densification behavior and mechanical properties were investigated. The dynamic failure behavior was analyzed through the Hopkinson Bar (SHPB) testing. The results demonstrate that the addition of SiC W can effectively refine the microstructure and simultaneously improve the mechanical properties. The TiB 2 -B 4 C composite renforced with 6 wt% SiC W exhibits a nearly full-dense microstructure and excellent mechanical properties. The relative density, flexural strength , Vickers hardness and fracture toughness can reach to 99.95 %, 724 ± 61 MPa, 19.8 ± 0.7 GPa and 6.7 ± 0.3 MPa m 1/2 , respectively. The dynamic failure behavior exhibits that the damage degree increases with elevated loading speed. Moreover, the single-peak and double-peak of the waveform correspond to the two damage degrees of "broken" and "crushed".
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
·
2018
·
IF 3.779
Xiaoxuan Pang,Yajiang Xian,Wei Wang,Pengcheng Zhang
Aluminum matrix Boron carbide composites is an important thermal neutron shielding material. In order to prepare 12 wt% B 4 C/6061Al composite with higher mechanical properties by powder metallurgy method, the new composite reinforced by Nano-Al 2 O 3 particles was fabricated by hot isostatic pressing in the semi-solid temperature range. The tensile properties and strengthening effects of the composite were investigated in this research. The tensile stress-strain curve of the composites was tested by material testing machine, and the microstructure and tensile fracture morphology of composites were analyzed by scanning electron microscopy (SEM) and transmission electron microscopes (TEM). The results indicated that the tensile strength of the composite was greatly improved by the addition of Nano-Al 2 O 3 , but the elongation decreased obviously. Nano-Al 2 O 3 particles had seriously affected the microstructure and fracture morphology of the composite and lead to the more obvious brittle fracture characteristics . Strengthening mechanisms of Nano-Al 2 O 3 particles reinforced 6061Al/B 4 C composite have been discussed, which reveals that grain boundary strengthening mainly plays the most important role.
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 Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Yang Wang,Qiang Liu,Biao Zhang,Hongxu Wang,Paul J. Hazell,Zhuoqun Han,Jian Li,Bo Li,Ling Li,Futian Liu,Feng Ye
Functionally graded materials (FGMs) are promising protective structures for lightweight armor plates because of their features and designability. However, traditional discretely layered FGMs with macroscopic interfaces can generate unfavorable interlaminar stresses under ballistic attacks, eventually leading to delamination or interlayer tearing. Herein, we constructed new B 4 C/2024Al FGMs without sharp interfaces between layers. The FGM armor systems with varying through-the-thickness distributions were tested against 7.62 mm armor-piercing incendiary projectiles. The effects of compositional gradient exponent on the damage characteristics, stress distribution and energy evolution were numerically and experimentally investigated. The results indicated that the smooth transition within through-the-thickness microstructures effectively avoided the occurrence of interlayer delamination or tearing. The compositional gradient exponent played an essential role in the impact response of the FGM targets. The FGM having a linear composition gradient outperformed other nonlinear types with respect to energy absorption and ballistic properties due to the reduced tensile wave strength and prolonged projectile-target interaction time. Furthermore, the structural optimization problem with the objective of maximizing ballistic efficiency was solved using the conjugate gradient method, and the optimal design of the FGM targets was achieved. The current research provides a promising design guideline for developing and optimizing new advanced lightweight composite armor.
研究领域:
材料科学
·
力学工程
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Yihan Zhang,Shihong Zhang,Yi He,Hongjie Li,Teng He,Yi Fan,Huili Zhang
Ni-B/B 4 C composite coatings on N80 steel were achieved by pulsed electrodeposition (PED). The optimal condition for obtaining composite coating is investigated via studying the effects of different content B 4 C on the performance of Ni-B/B 4 C coatings, including the surface morphology , microstructure, hardness and electrochemical properties . Scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and energy dispersive spectrometer (EDS) were used to analyze the surface morphology, crystal morphology and element type and content of the composite coatings. The hardness of coatings was investigated by micro-hardness test. The electrochemical properties of coatings were demonstrated by electrochemical impedance spectroscopy (EIS) and scanning electrochemical microscope (SECM). Results show that the grain was uniformly deposited on the surface of N80 steel, and no pinholes and microcracks were captured. Besides, the average Vickers hardness of the Ni-B/B 4 C was the highest (1030.61 HV), and the average coefficient of friction (COF) is 0.22 (the average COF of Ni-B is 0.49). In 3.5 w % NaCl solution, Ni-B/B 4 C (2 g L −1 ) exhibits good corrosion resistance , with a corrosion voltage of − 0.30 − 0.010 + 0.010 V, and a corrosion current of − 1.15 − 0.220 + 0.219 μA.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）