JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Yumin An,Kun Wan,Yi Yang,Yongna Jia,Yehong Cheng
Herein, biomimetic C f /ZrB 2 -SiC ceramic composites with bouligand structures are fabricated by combining precursor impregnation, coating, helical assembly and hot-pressing sintering. First, C f /ZrB 2 -SiC ceramic films are achieved through a precursor impregnation method using polycarbosilane (PCS). Second, the PCS-C f /ZrB 2 -SiC ceramic films are coated with ZrB 2 and SiC ceramic layers. Finally, hot-pressing sintering is employed to densify helical assembly C f /ceramic films with a fixed angle of 30°. The microstructures and carbon fiber content on the mechanical properties of biomimetic C f /ZrB 2 -SiC ceramic composites are analyzed in detail. The results show that the coated ceramic layer on PCS-C f /ZrB 2 -SiC films can heal the cracks formed by pyrolysis of PCS, and the mechanical properties are obviously improved. Meanwhile, the mechanical properties could be tuned by the contents of the carbon fiber. The toughening mechanisms of C f /ZrB 2 -SiC ceramic composites with bouligand structures are mainly zigzag cracks, crack deflection, multiple cracks, carbon fiber pulling out and bridging.
研究领域:
材料科学
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Zhibo Chen,Xiaotong Zhao,Mingliang Li,Hailong Wang,Qiang Li,Gang Shao,Wen Liu,Hongliang Xu,Hongxia Lu,Rui Zhang,Linan An
Rod-like ZrB 2 crystals were synthesized at 1600 °C in Ar atmosphere by boro/carbothermal reduction using ZrOCl 2 ⋅8H 2 O, B 4 C and carbon powders as raw materials. The optimum molar ratio of raw materials required to form pure ZrB 2 grains was found to be 2: 1.2: 3. With increase in temperature and subsequent heat preservation stage, ZrB 2 powders grew into a rod-like morphology along the c axis. The rod-like ZrB 2 grains obtained at 1600 °C have diameters of 0.5–3 μm and high aspect ratios of >8. Effects of molar ratio of raw materials, heating temperature and holding time on the phase composition and final morphology were investigated. Growth mechanism of rod-like ZrB 2 grains was also analyzed.
研究领域:
材料科学
·
化学工程
·
晶体学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2019
·Vol. 34
·期 5
·1003-1007
·
IF 0.605
Wu Yicheng,He Yannan,Yu Zhiqiang
The effect of interfacial modification on flexural strength of epoxy composites filled with modified ZrB 2 -Al 2 O 3 composite fillers was investigated in order to explore the stress distribution of modified composites under external load. The mechanical performance of epoxy composites filled with 0 vol%, 1 vol%, 3 vol% and 5 vol% unmodified and modified ZrB 2 -Al 2 O 3 fillers was characterized by three point bending (TPB) tests. The fracture surfaces of epoxy composites were observed by scanning electronic microscope (SEM). The results showed that the epoxy composite reinforced by 1 vol% modified fillers exhibited the optimal mechanical performance. According to the Von Mises stress contours simulated by finite element models (FEM) and the SEM images, it was shown that the modified ZrB 2 -Al 2 O 3 multiphase fillers could homogenize the stress in the epoxy composites due to the transition effect resulted from the interfacial modification layers on the surfaces of multiphase fillers. It contributed to the improvement of mechanical performance of epoxy composites further.
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
VACUUM
·
2024
·
IF 3.8
Xingtao Cheng,Yi He,Siming Yan,Ruxia Song,Zhiyuan Li,Liping Yan,Hongjie Li,Kaijun Wei,Qing Yuan,Shijun Xu
In this study, a pulsed electrodeposition approach was used to create a Ni-Cu/ZrB 2 composite coating on the surface of J55 steel. Ni-Cu/ZrB 2 composite coatings with different material additions were prepared, and the surface morphology, grain size, microhardness and wear and corrosion resistance were investigated. The results confirmed that the embedding of ZrB 2 in the Ni-Cu coating can refine the grains and make the coating surface denser. Furthermore, ZrB 2 can effectively increase the wear resistance and corrosion resistance of the coating; the Ni-Cu/ZrB 2 (1.0 g/L) composite coating reflects this by having the shallowest and narrowest wear cross-section as well as the lowest average friction coefficient (0.537). Additionally, the composite coating has the highest impedance modulus, reaching 83.60 kΩ/cm 2 . The composite coating improved corrosion resistance by 63.1 % compared to the pure sample. The enhancement in the coating's corrosion resistance can be attributed to three factors. Firstly, the addition of zirconium diborate refines the coating grain and changes the corrosion type from pitting corrosion to homogeneous corrosion. Secondly, zirconium diborate forms a physical barrier against corrosive ions. Lastly, the formation of the oxide layer on the coating during the process of corrosion, also enhances the material's resistance to corrosion.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Haibo Wu,Jie Yin,Yinsheng Li,Yunzhou Zhu,Xuejian Liu,Sea-Hoon Lee,Yiquan Wu,Zhengren Huang
ZrB 2 –SiC foams were prepared from composite poring mechanisms of foaming and solid poring (PAA beads) by the application of a gelcasting technique. The porosities and microstructures of sintered bulks were tailored through changing the solids loading of slurries and the amount of added PAA beads. The increase in solid loading caused high viscosities of slurries, and thus resulted in the reduction of porosity and a tendency to form close pores. With increasing the amount of PAA beads, high porosities (up to 91.4%) and obvious connectivity improvement between bubble-derived pores emerged owing to efficient foaming and presence of bead-derived pores. As the porosity increased, the compressive strength (0.4–8.2 MPa) decreased, and the gas permeability (9.7–62.1×10 −12 m 2 ) augmented because of the effects of bead-derived pores and the increase in window number and size of bubble-bead pores.
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 SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Bowen Zhang,Fugang Zhong,Xinchao Qiu,Jianbo Xu,Mengchen Hu,Jun Ou-Yang,Yue Zhang,Benpeng Zhu,Xiaofei Yang,Shi Chen
Hafnium carbide (HfC) whiskers were successfully synthesized by combining hydrothermal and carbothermal reduction. The precursor of HfC whiskers was prepared by the hydrothermal method, subsequently pyrolyzed, and reduced to HfC whiskers at 1500–1700 °C. The synthesis parameters of HfC whiskers at various temperatures, C/Hf molar ratios, and NaF concentrations were investigated in detail. The whiskers with diameters of 1–3 μm and lengths of 50–90 μm were prepared by pyrolyzing the precursors with a C/Hf molar ratio of 6 at 1700 °C. The experimental results and thermodynamic analysis demonstrated that the growth of HfC whiskers was governed by the vapor-liquid-solid (VLS) mechanism. Furthermore, the prepared HfC whiskers were added to the ZrB 2 -HfO 2 coatings on the surface of tungsten-rhenium substrates in different ratios to toughen the coatings. The thermal shock test results indicated that the coatings toughened with HfC whiskers had better thermal shock resistance. In particular, the maximum number of thermal shock cycles that 6%HfC W -ZH could withstand was five times higher than that of W–Re alloy and about one time higher than that of ZH coatings without HfC whiskers. The thermal shock resistance of the ZrB 2 -HfO 2 coatings was significantly improved by adding HfC whiskers.
研究领域:
材料科学
·
陶瓷材料
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA SCRIPTA
·
2024
·Vol. 99
·期 7
·075978
·
IF 2.6
Ning Zhong,Jean Baptiste Maniriho,Qianlin Wu,Xiaodong Wang,Yijia Gu,Wenge Li,Yuantao Zhao
This work was initiated with the purpose of expanding the utilization of nickel-based composite coatings, especially in wear and corrosion-related industrial applications. NiCoP coatings have long attracted scientific and engineering interest due to their enhanced mechanical properties reinforced by incorporation with a reinforcement phase. In the present study, NiCoP composite coatings reinforced with ZrB2 ceramic particles were synthesized by direct current deposition using a modified Watt's type bath. The microstructures of composite coatings were studied by x-ray diffraction analysis, energy dispersive x-ray spectroscopy, and scanning electron microscopy, respectively. The hardness and tribological properties of the composite coatings were evaluated and compared. The corrosion behaviors of the deposits were investigated using electrochemical spectroscopy and potentiodynamic polarization techniques in simulated seawater. The effect of ZrB2 content on the microstructures and mechanical properties of the composite coatings was explored and discussed. The present study indicates that there is a progressive enhancement in the hardness, corrosion resistance, and wear resistance of the composite coatings with the increase in ZrB2 loading. The NiCoP-12 g/l-ZrB2 coating possesses the highest microhardness and superior wear performance, while the NiCoP-6 g/l-ZrB2 coating exhibits the best anti-corrosion properties. The present study shows a cost-effective and feasible solution for the preparation of NiCoP protective coatings with enhanced properties, which holds great potential for industrial applications requiring wear and anti-corrosion protection.
研究领域:
材料科学
·
电化学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Faliang Li,Cao Tan,Jianghao Liu,Junkai Wang,Quanli Jia,Haijun Zhang,Shaowei Zhang
Herein, we prepare phase-pure ZrB 2 -SiC composite powders by molten-salt-mediated reduction of ZrSiO 4 /B 2 O 3 /activated carbon mixtures with Mg, showing that the phase composition and morphology of the above composites is influenced by firing temperature, B:Zr and C:Si molar ratios, and the amount of excess Mg. Notably, phase-pure ZrB 2 -SiC powder with a ZrB 2 :SiC weight ratio of ~75:25 could be obtained by 3-h firing at 1200 °C, i.e., at a temperature lower than that used for conventional carbothermal reduction by at least 200 °C. As-prepared ZrB 2 -SiC composites exhibited grain sizes of several microns and comprised SiC nanoparticles well distributed in the ZrB 2 matrix. Finally, the oxidation activation energies of the prepared ZrB 2 and ZrB 2 -SiC powders were determined as 326 and 381 kJ/mol, respectively, which demonstrated that the introduction of SiC improved the oxidation resistance of monolithic ZrB 2 .
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
MATERIALS LETTERS
·
2023
·
IF 3
Zhuoli Xu,Fuping Li,Yan Zhang,Sixuan Zhang,Kang Zhao,Yufei Tang
In this work, ZrB 2 /ZrC nanofiber aerogels with excellent elasticity and ultra-low thermal conductivity were prepared by electrospinning and freeze-drying. The aerogels with isotropic cellular-like pore structure were obtained with pore walls composed of graphene oxide attached with ZrB 2 /ZrC nanofibers. The aerogels showed recoverable property under 60 % compressive strain. The thermal conductivity of the aerogels was 0.029 W·m −1 ·k −1 , much lower than that of other carbide and boride aerogels. These intriguing results may offer considerable advantages for thermal insulation in extreme environments.
研究领域:
材料科学
·
热绝缘材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Anzhe Wang,Ping Hu,Cheng Fang,Dongyang Zhang,Xinghong Zhang
The effects of cooling rate and initial temperature on thermal shock behavior of ZrB 2 -SiC ceramic were studied by water spraying method with a thermocouple real-time temperature acquisition technique for the first time. It was shown that the cooling rate could be adjusted by changing the water flow rate, and the fracture behavior strongly depended on both the cooling rate and initial temperature. When the extreme value of cooling rate was constant, the decrease of initial temperature would lead to the increase of thermal stress, accompanied by a more serious damage of material, which was mainly because of the nonlinear relationship between thermal expansion coefficient and temperature.
研究领域:
材料科学
·
工程热物理
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2021
·
IF 4.837
Hao Shen,Xinyang Li,Chenguang Hu,Zhen Wang,Xiaoye Hu,Yue Li,Jian Yan
Boride-based ultra-high temperature ceramics have been extensively utilized as high temperature thermal protection materials due to its excellent physical and mechanical properties . Yet, the synthesis of boride-based ceramic powder with high purity, ultra-fine structure and excellent dispersity remains a great challenge to reach. In this work, zirconium diboride (ZrB 2 ) ultra-high temperature ceramic powder with high purity and ultra-fine structure (size of hundreds of nanometers) was prepared by carbothermal reaction combined with sol-gel method. Various dispersants including oleic acid (OA), polyethylene glycol (PEG) and polyvinyl pyrrolidone (PVP) were employed during the preparation procedure to tune the physicochemical properties of the resultant ZrB 2 . According to the X-ray diffraction and microscopy characterizations, it was revealed that the OA turned up as the most effective dispersant to obtain the ZrB 2 powder with hundreds-nanometer-scale and high purity. Besides, the thermogravimetry-differential thermal analysis and Fourier transformed infrared spectroscopy analysis were performed, unveiling the function of OA in enhancing the dispersity of the ZrB 2 . Such a work on the effect of dispersant on the preparation of ultra-high temperature ceramic powder could shed some important light for the development of high temperature resistant materials.
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
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Yushi Qi,Kai Jiang,Changling Zhou,Wenbo Han,Zhiming Du
The development of novel cermet composites based on porous ceramics with high porosity, interconnected pore structure and good mechanical property has attracted considerable attention in engineering application. In this work, water-based freeze casting process was employed to fabricate ZrB 2 -SiC porous ceramic with aligned lamellar-channels structure using PAA-NH 4 as the dispersant. The results revealed that the well-dispersed suspension with best rheological behavior was obtained using 1.0 wt% PAA-NH 4 at pH 9. The crack-free porous ceramic exhibited small volume shrinkage ranging from 2.59 % to 1.87 %. By varying the solid loading, the fabricated samples displayed a tailored porosity ranging from 76.12% to 59.37% and an excellent compressive strength of 7 MPa to 78 MPa. After oxidation, the samples displayed a decreased porosity and an increased compressive strength. The ZrB 2 SiC porous ceramic fabricated in this work will be a promising candidate for the framework of cermet composite.
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
危险品化学品经营许可证（带存储）