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
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 8
·5046-5066
·
IF 3.9
Bo Wang,Delong Cai,Haoyi Wang,Wenhua Zou,Zhihua Yang,Xiaoming Duan,Peigang He,Daxin Li,Wenjiu Duan,Dechang Jia,Hua-Tay Lin,Chao Zhao,Yu Zhou
Boron carbide (B 4 C) ceramic composites with excellent mechanical properties were fabricated by hot-pressing using B 4 C, silicon carbide (SiC), titanium boride (TiB 2 ), and magnesium aluminum silicate (MAS) as raw materials. The influences of SiC and TiB 2 content on the microstructural evolution and mechanical properties of the composites were systematically investigated. The mechanism by which MAS promotes the sintering process of composites was also investigated. MAS exists in composites in the form of amorphous phase. It can effectively remove the oxide layer from the surface of ceramic particles during the high temperature sintering process. The typical values of relative density, hardness, bending strength, and fracture toughness of B 4 C–SiC–TiB 2 composites are 99.6%, 32.61 GPa, 434 MPa, and 6.20 MPa m 1/2 , respectively. Based on the microstructure observations and finite element modeling, the operative toughening mechanism is mainly attributed to the crack deflection along the grain boundary, which results from the residual stress field generated by the thermal expansion mismatch between B 4 C and TiB 2 phase.
研究领域:
材料科学
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工程学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MASS SPECTROMETRY
·
2024
·Vol. 59
·期 11
·e5098
·
IF 1.9
Dimei Hu,Lulu Yu,Zijian Wei,Lingpeng Zhan,Peiqi Luo
A novel inorganic nonmetallic material boron carbide (B 4 C) was applied in paper spray ionization to analyze organic molecules in both negative and positive modes. The utilization of B 4 C has led to a notable enhancement in signal responses for various molecules, including bisphenols and drugs, by approximately two to four times. The limit of detection (LOD) of bisphenol AF and nilotinib standard solutions can reach 1 and 0.5 μg/mL, respectively. Moreover, linear relationships for bisphenol AF was established within the concentration range of 1–100 μg/mL, exhibiting strong correlation coefficients. Recovery experiments for BPAF in water samples from the inlet and outlet of a sewage treatment plant, conducted without any pretreatment, achieved a maximum recovery rate of 98.8% and an RSD below 9.78%.
研究领域:
分析化学
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材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Nan Yang,Guoshuai Cai,Yange Wan,Ruoyu Zhang,Jiancun Li,Jingfang Zhang,Haijun Zhang,Hongli Liu,Xiaolei Yu,Mingchao Wang
In order to improve the burn-through resistance and environmental friendliness of epoxy resin-based flame-retardant coatings, high-performance coatings were developed by modifying them with silicone resin and B 4 C. By incorporating B 4 C and silicone resin, the coating's thermal stability was significantly enhanced. By participating in a series of chemical reactions when the coating was exposed to fire, they promoted spontaneous ceramicized and vitrified modification, increased the mass of char residue, improved the surface compactness, optimized the foam structure, and improved the specific surface area of char residue. Compared to blank sample E10S0 and others, E85S15B3 coating co-modified with silicone resin and B 4 C showed the best performance. The backside temperature of E85S15B3 was only 164.34 °C after a 2 h combustion test. The peak heat release rate (PHRR), total heat release rate (THR), total smoke production (TSP), peak smoke production rate (PSPR), peak CO release rate (PCOPR), and peak CO 2 release rate (PCO 2 PR) of E85S15B3 were all significantly improved, with a decrease of 20.38 %, 40.06 %, 37.67 %, 49.21 %, 64.71 %, 0.03 % compared with that of E10S0 sample. The LOI value was 34.6 %, which was 48.24 % better than that of E10S0. Moreover, the compressive, tensile, and bending strengths of E85S15B3 were measured at 85.6 MPa, 25.6 MPa, and 45.3 MPa, respectively, marking a 22.1 % increase, 11.23 % increase, and 23.19 % increase over those of E10S0. The mechanism of flame-retardant includes cooling insulation, non-flammable gas-phase dilution flame retardancy, condensed phase physical insulation, reinforced-phase flame retardancy, and free radicals capturing to block combustion.
研究领域:
材料科学
·
防火材料
✓ 已验证
产品关联
DOI
高影响因子
Nuclear Science and Techniques
·
2018
·Vol. 29
·期 2
·17
·
IF 1.085
Liao Yi-Chuan,Xu Dui-Gong,Zhang Peng-Cheng
Boron carbide/natural rubber latex (B 4 C/NRL) flexible films were prepared via dip-molding with B 4 C content in the range of 5–55 wt% for thermal neutron (0.0253 eV) shielding. B 4 C was well dispersed in NRL according to microscopic observation. Both the inside and outside surfaces of the film were smooth. For B 4 C/NRL flexible films, the minimum elongation at break was greater than 600%, the minimum tensile strength was greater than 12 MPa, and the hardness was in the range of 35–55 HA, which were suitable for preparing flexible wearable products. The attenuation efficiencies of the B 4 C/NRL flexible films for thermal neutrons were also calculated. The B 4 C/NRL flexible films exhibit good attenuation effect for thermal neutrons.
研究领域:
材料科学
·
核工程
·
辐射防护
·
高分子科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xizhao Chen,Huixian Jia,Yingjie Li,Wei Peng,Yongxi Jin,Ji Zou,Jingjing Xie,Weimin Wang,Zhengyi Fu
Novel laminated ceramics based on B 4 C-SiC composite units were fabricated by hot pressing at 1950 °C under 30 MPa. The laminated ceramic has a three-layer “sandwich structure” that generates compressive residual stress in the outer layer. The trend of surface compressive stress with SiC content in B 4 C-SiC laminated composite units was investigated using finite element analysis and Raman spectroscopy. The results show that residual stress in the surface layer of laminated ceramic increases with increasing interlayer compositional differences. The enhancement in bending strength and hardness is attributed to the surface residual compressive stress, which counteracts external loads and retards surface crack propagation, whereas the improved fracture toughness arises from crack growth inhibition by surface compressive stress and crack deflection caused by tensile stress in the intermediate layer. The apparent fracture toughness of laminated ceramic is found to depend on the initial crack length, with maximum toughness achieved when the crack is located at the interface between the outer and intermediate layers. In addition, high compressive stress may induce a greater density of dislocations, which represents a potential toughening mechanism in laminated ceramics. The optimum bending strength, hardness and fracture toughness of the laminated material are 601 ± 28 MPa, 33.6 ± 0.4 GPa and 7.2 ± 0.3 MPa m 1/2 , respectively. The fracture toughness is improved by 51 % compared with the monolithic material. This study demonstrates the simultaneous enhancement of both strength and fracture toughness while maintaining the high hardness of B 4 C ceramics.
✓ 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.
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Lijie Duan,Mengbin Gu,Minghao Wang,Liquan Liu,Xue Cheng,Xueqi Fan,Jun Huang
Widespread detection in soils and sediments underscores the potential threats posed by persistent, bioaccumulative and toxic perfluorooctane sulfonate (PFOS) to ecosystems and organisms. Nevertheless, the formidable energy of the C-F bond imparts stability and hampers degradation. This study investigates the potential of boron carbide (B 4 C), a hard-ceramic material often utilized in armor and abrasion contexts, for degrading solid-phase PFOS through ball milling. Following a 60-minute reaction period, PFOS degradation reached 100 %, while desulfurization stabilized at 13.9 %. Defluorination initially rose to 23.7 % but subsequently displayed a gradual decline. Fluoride ions, once released, were secured and the stable reservoir surface of B 4 C during the ball-milling process, leading to the formation of B-C-B-F chemical bonds, which was confirmed through characterization by XPS, FTIR, and solid-state NMR analyses. Furthermore, intermediate byproducts formed during the degradation of PFOS, encompassing perfluoroalkyl sulfonic acids (PFSAs) and perfluoro carboxylic acids (PFCAs), were identified. Eventually, the generation of free electrons, contributing to the facilitation of degradation for both PFOS and its intermediates, was confirmed through the DPPH experiment. This identification underscores the intricacy of the PFOS degradation pathway, which encompasses the generation and subsequent breakdown of these intermediates. These discoveries hold significance for pioneering sustainable and inventive methods to combat PFOS pollution across diverse applications. Furthermore, they enrich the comprehension of how mechanical forces can be leveraged for the eco-friendly removal of PFOS contaminants.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
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
·
陶瓷工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhipeng Huo,Yidong Lu,Zuoyang Chen,Jie Zhang,Hong Zhang,Guoqiang Zhong
In this research, a series of Eu 2 O 3 /B 4 C/HDPE composites containing micromorphology tunable Eu 2 O 3 submicron spheres as fillers are prepared for shielding neutron and gamma ray. The influence of microstructure of Eu 2 O 3 fillers on thermal stability, mechanical, and radiation shielding properties of composites are studied in detail. The growth process of Eu 2 O 3 precursor (Eu(OH)CO 3 ) follows the LaMer and Ostwald ripening mechanism. The FESEM reveal that the microstructure of synthesized Eu 2 O 3 is submicron sphere and the particle size decreases with addition of urea content in the reactant solution. HRTEM and SEAD images reveal that the overall crystal morphology of the Eu 2 O 3 fillers is polycrystalline. BET analyses reveal that the hysteresis loops of nitrogen adsorption-desorption isotherms changes from Type H1 to H3 after Eu 2 O 3 fillers are ball-milled, which is attributed to the suppression of nanoparticle agglomeration by ball milling. The FESEM images and EDS mapping of the fracture surfaces of the composites reveal that Eu 2 O 3 fillers are evenly distributed in the HDPE matrix. It is revealed that under the condition that the agglomeration of the nanoparticles is effectively suppressed, the higher BET-specific surface area and smaller size of Eu 2 O 3 fillers are conducive to the various properties of the composites. The superior composite containing Eu 2 O 3 (R = 1:30)/B 4 C/HDPE has a 99.1 % neutron shielding rate with 15 cm thickness under a 252 Cf neutron source and a 73.1 % gamma shielding rate with 15 cm thickness under a 137 Cs gamma source.
研究领域:
材料科学
·
辐射防护
·
核工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 15
·21915-21923
·
IF 4.527
Yingying Liu,Sheng Ge,Yihua Huang,Zhengren Huang
B 4 C-TiB 2 -SiC composites with W addition were successfully prepared by spark plasma sintering with B 4 C, TiB 2 , SiC, and W as raw materials. The XRD results indicate that the main phases of the composites are B 4 C, TiB 2 , SiC, and W 2 B 5 . A large number of core-shell structures were observed in the composites with the introduction of W. It is determined that the core is the TiB 2 phase and the shell is a (Ti, W) B 2 solid solution by EDS, EBSD , and TEM characterization methods. The core-shell structure is conducive to the deflection of cracks, thereby improving the fracture toughness of the composites. As a result, with the increase of W addition from 0 to 5 vol%, the fracture toughness of composites increased from 3.96±0.25 to 5.14±0.23 MPa m 1/2 , the Vickers hardness improved from 20.24±0.22 to 28.35±0.22 GPa.
研究领域:
材料科学
·
陶瓷与复合材料
·
材料力学性能
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
·
2023
·
IF 3.4
Shaohua Huo,Zhen Dong,Xiangcheng Li,Pengcheng Liu,Pingan Chen,Boquan Zhu
In this paper, a novel phosphate-based adhesive with excellent high-temperature bonding strength was prepared by using phosphate as the matrix and modified B 4 C, modified TiO 2 as well as low-temperature fused Zn–B–Si–Al-R glass materials as fillers. The effects of heat treatment temperature and filler compositions on the high-temperature bonding strength of the adhesive were investigated. The results indicated that the aluminum phosphate in the adhesive was transformed from orthorhombic to cubic crystalline at 210 ± 5 °C, which increased the cell stacking density from 2.19 g/cm 3 to 2.74 g/cm 3 and made the binder dense. After calcination at 500 °C, a large number of pyrophosphates were generated inside the adhesive, and the chemical bonds such as P–O–Si and P–O–Cu in these pyrophosphates formed reticulated skeletal macromolecules, which improved the network structure of the transition zone between the adhesive and stainless steel . Meanwhile, the difference in potential resulted in the exchange of Fe and Cu 2+ , H + at the bonding interface to enhance the high-temperature resistance and bonding strength of the specimen. When the additions of La 2 O 3 , Fe 2 O 3 , ZrO 2 , CuO were1.2%, 5%, 10%, and 15%, the maximum tensile strength of the specimen reached 8.73 MPa at 500 °C. The phosphate binder prepared in this work could be widely used in the field of high-temperature material repair such as aerospace and energy.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）