INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2013
·
IF 1.858
Rubing Zhang,Rujie He,Xinghong Zhang,Daining Fang
ZrB 2 –SiC ceramic composites were prepared through water-based gelcasting and pressureless sintering. Effects of the pressureless sintering temperature (1500–2000 °C), heating rate (5–15 °C/min) and soaking time (0.5–2 h) on the relative density, microstructure and mechanical properties of the ZrB 2 –SiC composites were investigated in detail. A sintering temperature of 2000 °C, a heating rate of 5 °C/min and a soaking time of 2 h were found to be the optimal pressureless sintering procedure. The relative density, flexural strength and fracture toughness of the ZrB 2 –SiC composite prepared under the optimum condition were 97.8%, 403.1 ± 27.8 MPa and 4.05 ± 0.42 MPa·m 1/2 , respectively.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
Journal of Advanced Ceramics
·
2019
·Vol. 8
·期 4
·527-536
·
IF 2.3
Zhang Zhaofu,Sha Jianjun,Zu Yufei,Dai Jixiang,Liu Yingjun
Self-toughening ZrB 2 –SiC based composites are fabricated by in-situ reactive hot pressing. The effect of sintering additive content on the microstructure and mechanical properties of the composites is investigated. Microstructure observation found that the in-situ reactive hot pressing could promote the anisotropic growth of ZrB 2 grains and the formation of interlocking microstructure. Such microstructure could improve the mechanical properties, especially, for the fracture toughness. The improved mechanical properties could be attributed to the self-toughening structure related to the ZrB 2 platelets and the formed interlocking microstructure, which could trigger various toughening mechanisms such as grain pull-out, crack bridging, crack deflection, and crack branching, providing the main contribution to the high fracture toughness.
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
CORROSION SCIENCE
·
2024
·
IF 7.4
Dongyang Zhang,Jie He,Yang Liu,Dazhao Liu,Cheng Yang,Lu Ren
The high-performance 3D C f-PyC /ZrB 2 -SiC composite was fabricated by vibration-assisted slurry impregnation and low-temperature hot pressing. The composite exhibited superior laser ablation resistance, leading to a low linear loss rate of 1.56×10 −2 mm/s at laser power density of 4878 W/cm 2 (Power 300 W, Laser beam diameter 2.8 mm) for 90 s. The coupling effect of a dense SiO 2 layer in fringe region followed by dense ZrO 2 layer in transitional region and next porous ZrO 2 layer in center region achieved superior laser ablation resistance.
研究领域:
材料科学
·
激光工程
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2016
·
IF 1.34
Dong HUANG,Ming-yu ZHANG,Qi-zhong HUANG,Li-ping WANG,Xian TANG,Xin YANG,Kai TONG
A novel SiC–ZrB 2 coating was prepared using a two-step technique by slurry-sintering and chemical vapor reaction on carbon/carbon (C/C) composites. The SiC–ZrB 2 coating was composed of the scattered ZrB 2 phase and the continuous SiC phase. It was observed that a good adhesion was built between the coating and the C/C composites. The SiC–ZrB 2 coating samples exhibited a better ablation resistance in comparison with the uncoated C/C composites. The SiO 2 –ZrO 2 barrier layer, the heat dissipation of the gaseous products and the pinning effect of ZrO 2 all contributed to the good ablation resistance of the SiC–ZrB 2 coated composites.
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
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
·
2024
·Vol. 31
·期 6
·1502-1513
·
IF 3.1
Yang Bo-lin,Kuang Chang-liu,Liu Zheng-long,Yu Chao,Deng Cheng-ji,Ding Jun
ZrB 2 -based ceramic composites were prepared by spark plasma sintering using ZrB 2 powder prepared by molten salt method as raw material and SiC and nano-graphite as additives. The effects of nano-graphite addition on the physical properties and oxidation resistance of ZrB 2 -based ceramic samples were investigated. The results show that the addition of an appropriate amount of nano-graphite can effectively improve the density of ZrB 2 -based ceramic composites and improve the physical properties of the materials. The flexural strength of the ceramic sample with 8 vol.% nano-graphite reached 418.54 MPa, which was 53.14% higher than that of ZrB 2 –SiC ceramic material (273.31 MPa), and its oxidation resistance was also significantly improved. It demonstrats that the addition of an appropriate amount of nano-graphite can effectively improve the physical properties and oxidation resistance of ZrB 2 –SiC ceramic composites. Via prolonging its service life in application and promoting the development of ZrB 2 -based ceramic composites, it is of great significance for clean steel smelting.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Binbin Wu,Na Ni,Xiaohui Fan,Xiaofeng Zhao,Ping Xiao,Fangwei Guo
ZrB 2 -SiC coatings with varied porous structures were deposited on SiC fiber tows using the sol-gel method and cured at 1400 ℃ in vacuum. Tensile strength of the coated SiC fibers were much lower than that of the uncoated fibers. The bimodal distribution in the Weibull plot of the coated SiC fibers demonstrated that the fracture of the coated fiber can be attributed to two types of defects: the porous structure of the coating and the fiber defects. Detailed morphology and microstructure characterization of the coating and fiber combined with strength calculation were carried out to investigate the individual contribution of the fiber defects and the porous coating layer respectively. The results revealed that apart from the fiber damage during the coating process the porous structure of the fiber coating has a non-negligible effect on the fiber strength, presumably due to a relatively strong bonding between the fiber and coating.
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 Materiomics
·
2024
·
IF 8.4
Chengwan Yang,Kewei Li,Mengen Hu,Xinyang Li,Ming Li,Xiaoye Hu,Yue Li,Zhulin Huang,Guowen Meng
Carbon-based materials, renowned for their low density, adjustable electrical conductivity, superior corrosion resistance and mechanical properties, and have found extensive applications in the field of electromagnetic wave absorption (EMWA). Despite their merits, the current EMWA and thermal insulation capabilities are not fully optimized, thereby restricting their applications in the aerospace sector. Herein, we introduce a combinatory methodology employing electrospinning followed by pyrolysis to in-situ integrate ZrO 2 and ZrB 2 nanoparticles onto the surface of carbon nanofibers, culminating in a flexible ZrO 2 /ZrB 2 /C nanofiber felt. The integration of ZrO 2 and ZrB 2 nanoparticles significantly augments impedance matching and promotes multifaceted scattering and interfacial polarization. Consequently, the ZrO 2 /ZrB 2 /C nanofiber felt demonstrates a minimum reflection loss (RL min ) of –54 dB and the effective absorption bandwidth (EAB, RL≤–10 dB) is 3.1 GHz. Moreover, the three-dimensional porous architecture and the presence of multiple heterogeneous interfaces endow the ZrO 2 /ZrB 2 /C nanofiber felt with an ultralow thermal conductivity of 0.016 W⸱m −1 ⸱K −1 at 1100 °C, underscoring its exceptional potential for infrared stealth. This work shows considerable guiding significance for the design of bi-functional EMWA materials with ultralow thermal conductivity in aerospace field.
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
·
2020
·
IF 3.83
Zhuoli Xu,Kang Zhao,Fuping Li,Yashan Huo,Yufei Tang
In this paper, ZrB 2 –ZrC composite nanofibers were prepared by electrospinning method followed by carbothermal reduction process. Nanofibers with ZrC content of 15, 35 and 50 wt%, respectively, were obtained by varying the n(B)/n(Zr) molar ratio. The oxidation resistance of fabricated nanofibers was investigated by the non-isothermal thermogravimetric method. The effect of ZrC content on the oxidation resistance of ZrB 2 –ZrC composite nanofibers was analyzed systematically. The Kissinger method was used to calculate the oxidative activation energy (E) of the fibers with different ZrC content. The results show that the E values of fiber with n(B)/n(Zr) equal to 2.5, 3.5 and 4 are 219, 362 and 275 kJ/mol. Among the prepared fibers, the fiber with n(B)/n(Zr) of 3.5 has the highest oxidative activation energy and the best oxidation resistance.
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
International Journal of Applied Ceramic Technology
·
2022
·Vol. 20
·期 3
·1636-1645
·
IF 2.328
Yehong Cheng,Fan Zhang,Denghao Ma,Yixin Zhang,Yaxiong Liu,Yumin An,Anzhe Wang,Ning Hu,Libin Zhao,Wenbo Han
Although C f /ZrB 2 –SiC composites prepared via direct ink writing combined with low-temperature hot-pressing were shown to exhibit high relative density, high preparation efficiency, and excellent flexural strength and fracture toughness in our previous work, their oxidation and ablation resistance at high and ultrahigh temperatures had not been investigated. In this work, the oxidation and ablation resistance of C f /ZrB 2 –SiC composites were evaluated via static oxidation at high temperature (1500°C) and oxyacetylene ablation at ultrahigh temperatures (2080 and 2270°C), respectively. The thickness of the oxide layer of the C f /ZrB 2 –SiC composites is <40 μm after oxidizing at 1500°C for 1 h. The C f /ZrB 2 –SiC composites exhibit non-ablative properties after oxyacetylene ablation at 2080 and 2270°C for >600 s, with mass ablation rates of 3.77 × 10 −3 and 5.53 × 10 −3 mg/(cm 2 s), and linear ablation rates of −4.5 × 10 −4 and −5.8 × 10 −4 mm/s, respectively. Upon an increase in the ablation temperature from 2080 to 2270°C, the thickness of the total oxide layer increases from 360 to 570 μm, and the carbon fibers remain intact in the unaffected region. Moreover, the oxidation and ablation process of C f /ZrB 2 –SiC at various temperatures was analyzed and discussed.
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
·
2017
·
IF 2.986
Anzhe Wang,Ping Hu,Xinghong Zhang,Dongyang Zhang,Cheng Fang
Reliable evaluation of the thermal shock behavior of complex-shaped components is very important for ultra-high temperature ceramics. Unfortunately progress in this field is hampered by a lack of available experimental methods. Here, a novel water spraying method is proposed to investigate the thermal shock behavior of ZrB 2 -based sharp leading edges (SLEs). Results indicated that the introduction of graphite flakes significantly improved the thermal shock resistance of ZrB 2 -SiC (ZS) SLEs. However, owing to the anisotropies of microstructure and thermal conductivity of ZrB 2 -SiC-G (ZSG) ceramic, the thermal shock resistance and the failure mode of ZSG SLEs were sensitive to the sampling orientation, which also were remarkably influenced by the size and/or shape of SLEs, leading to the variability of critical failure temperature from 750 °C to 375 °C and crack patterns from deflection to wave-shaped.
研究领域:
材料科学
·
高温陶瓷研究
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Zhuoli Xu,Fuping Li,Yue Wang,Kang Zhao,Yufei Tang
In this work, ZrB 2 –ZrC–SiC composite nanofibers were prepared by electrospinning combined with the carbothermal reduction method. The morphology, phase composition, and oxidation resistance of the composite nanofibers were investigated. The results showed that ZrB 2 –ZrC–SiC composite nanofibers with good crystallinity were obtained after calcination at 1550 °C. The obtained fibers distributed uniformly, and the average diameter was about 375 nm. ZrB 2 –ZrC–SiC nanofibers were oxidized at 587 °C, which was higher than that of the ZrB 2 –ZrC nanofibers. It revealed that the addition of SiC could improve the oxidation resistance of ZrB 2 –ZrC composite nanofibers.
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
POLYMER COMPOSITES
·
2018
·Vol. 40
·期 7
·2734-2744
·
IF 1.943
Yannan He,Zhiqiang Yu
Bisphenol A epoxy resin (BAEP) was modified with high performance zirconium diboride (ZrB 2 ) ceramic particles using an in-situ polymerization method for the improvement of its dielectric and thermal properties. The dielectric properties of ZrB 2 /BAEP composites were investigated by numerical simulation and experiment. Thermal gravimetric analysis (TGA) and differential scanning calorimeter (DSC) were used to study thermal stability of the composites. Microstructures of filling composites were also observed by transmission electron microscopy (TEM). Results indicated that ZrB 2 particles were well dispersed in the polymer matrix. The dielectric constant of composites firstly decreased with the introduction of ZrB 2 particles. The composite filled with 2 wt% ZrB 2 particles exhibited the optimal dielectric properties. Data obtained from finite element analysis (FEA) were reasonable agreement with the experimental values. The thermal stability of BAEP also significantly increased due to the addition of ZrB 2 particles. The initial decomposition temperature of 2 wt% ZrB 2 /BAEP composite increased by 10°C compared with that of the pure BAEP. POLYM. COMPOS., 40:2734–2744, 2019. © 2018 Society of Plastics Engineers
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）