JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 102
·期 4
·2041-2052
·
IF 2.956
Yehong Cheng,Yang Lyu,Wenbo Han,Ping Hu,Shanbao Zhou,Xinghong Zhang
The design of bioinspired architectures is effective for increasing the toughness of ceramic materials. Particularly, a dual composite equiaxial architecture is ideal for fabricating weak interface-toughened ZrB 2 -SiC ceramics with isotropic performance. In this paper, ZrB 2 -SiC-Graphene@ZrB 2 -SiC dual composite ceramics were synthesized via an innovative processing technique of granulating-coating method. ZrB 2 -20 vol.% SiC containing 30 vol.% Graphene was selected as weak interface to realize multiscale toughening and improve the thermal shock resistance of ZrB 2 -SiC ceramic materials. The incorporation of ZrB 2 -SiC-Graphene weak interface into the ZrB 2 -SiC matrix improved the damage tolerance and critical thermal shock temperature difference. The design of equiaxial structures moderated the anisotropy of performance in different planes. The graphene sheets incorporated in the ZrB 2 -SiC-Graphene interface phase played a key role in multiscale toughening, including macroscopic toughening of crack deflection and microcracks, and microscopic toughening of graphene bridging and pull-out.
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
·
2020
·
IF 4.495
Yehong Cheng,Yaxiong Liu,Yumin An,Ning Hu
Graphene derivative materials exhibit excellent mechanical and thermal properties, which have been extensively used to toughen ceramics and improve thermal shock resistance . To overcome the thermal agglomeration of graphene oxide (GO) during heating and drying process, ZrB 2 -SiC particles decorated GO hybrid foam with uniformly anchored ceramic particles was synthesized by electrostatic self-assembly and liquid nitrogen-assisted freeze-drying process. Densified rGO/ZrB 2 -SiC ceramics with varying microstructure, thermal physical and mechanical properties were obtained by adjusting the content of decorated ceramic particles. Although the flexural strength of rGO/ZrB 2 -SiC ceramics have an attenuation compared with that of ZrB 2 -SiC ceramic, the thermal conductivity , work of fracture and thermal shock resistance are greatly improved. rGO/ZrB 2 -SiC ceramics exhibit delayed fracture and increasing R-curve behavior during the crack propagation . The novel preparation technology allows for the well dispersion of rGO in ZrB 2 -SiC ceramics and can be easily extended to other ceramic or metal materials systems.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2012
·
IF 2.003
Rujie He,Ping Hu,Xinghong Zhang,Chen Liu
Complex-shaped ZrB 2 –SiC ultra high temperature ceramic components were successfully fabricated by gelcasting technique and pressureless sintering. When 0.4 wt% poly(acrylic acid) (PAA) was used as dispersant and the pH value was 10, an aqueous ZrB 2 –SiC–B 4 C–C slurry with a high solid loading up to 50 vol% but low viscosity (3.1 Pa s at 60 s −1 ) was prepared. For gelcasting process, the suitable monomers content (AM and MBAM) and the mass ratio of monomers (AM/MBAM) were selected as 3 wt% and 15:1, respectively. After pressureless sintering at 2100 °C for 2 h, ZrB 2 –SiC ceramics (using B 4 C and C as sintering additives) finally achieved about 98% density. Investigation of the mechanical properties revealed a flexural strength of 405±27 MPa and a fracture toughness of 4.3±0.3 MPa m 1/2 . Complex-shaped ZrB 2 –SiC ceramic components with homogeneous microstructure were also successfully produced. This study confirms that gelcasting is a reliable process for the fabricating of complex-shaped ultra high temperature ceramic components with satisfied properties.
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
·
2024
·
IF 5.1
Bolin Yang,Changliu Kuang,Zhenglong Liu,Chao Yu,Chengji Deng,Jun Ding,Zhoufu Wang,Shixian Zhao
In order to effectively improve the density and oxidation resistance of ZrB 2 -SiC coating materials, HfB 2 was added into ZrB 2 -SiC system and their physical properties, oxidation resistance were explored. It was observed that the flexural strength of the spark plasma sintered sample with 8 vol% HfB 2 was 717.1 MPa, which was 162.6 % higher than that of the sample without HfB 2 (273.1 MPa). At the same time, the oxidation activation energy of the sample with 15 vol% HfB 2 was increased to 511.98 kJ/mol, showing excellent oxidation resistance. The oxidation process is that HfB 2 and ZrB 2 were oxidized prior to SiC to form HfO 2 and ZrO 2 to form a dense oxide layer on the outermost layer of the sample, and SiC reacted to form a second dense SiO 2 layer to hinder oxygen intrusion. In summary, diboride can achieve the synergistic effect of improving the oxidation resistance and structural optimization of ZrB 2 -SiC-HfB 2 coatings composites, which provides a theoretical basis for its practical application.
研究领域:
材料科学
·
高温材料
·
涂层技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Jianjie Hao,Jiayan Li,Binglin Zou,Xiaolong Cai,Wei Shi,Yi Tan
ZrB 2 -SiC-Al 2 O 3 (ZSA) and ZrB 2 -SiC-Si (ZSS) coatings were prepared on the surface of C/C composites by atmospheric plasma spraying . During oxidation at 1200 ℃ for 10 h, the formation of B 2 O 3 in the ZSA coating volatilizes gradually, no glass phase is able to seal cracks and holes, resulting in poor oxidation resistance . On the other hand, the ZSS coating produces a large amount of borosilicate glass phase and still gains 0.8% weight after 10 h. During oxidation at 1500 ℃, a low viscosity SiO 2 glass phase forms on the ZSA coating, due to the presence of Al 2 O 3 and this glassy phase has a good ability to seal defects. However, the rapid volatilization of B 2 O 3 in the ZSS coating leads to the formation of large holes in the coating, and to progressively increased viscosity of SiO 2 glass phase, resulting in decreased oxidation resistance.
研究领域:
材料科学
·
涂层技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
·
2018
·Vol. 126
·期 7
·504-509
·
IF 0.887
Zhiwu JIANG,Peizhong FENG,Xiaohong WANG,Hanzhu ZHANG,Yanan LIU
MoSi2–ZrB2–SiC ceramics were synthesized using Mo, Zr, Si and B4C powders by self-propagating high-temperature synthesis and densifying by spark plasma sintering. The effects of MoSi2 content on the combustion synthesis process, microstructure, and mechanical properties of the ceramics were investigated. The results showed that combustion synthesis is an unstable mode, spiral combustion. The Gibbs calculations and combustion temperature curves indicate there are two reactions occurring at the same time. The volume fraction of the four different phases and their relative densities were also measured and calculated. Compared to pure MoSi2, the 1.0MoSi2–0.2ZrB2–0.1SiC (M10) ceramic exhibits excellent mechanical properties with its maximum Vickers hardness and fracture toughness being 14.0 GPa and of 5.5 MPa m1/2, respectively. The hardness is in agreement with the rule of mixture. The morphology of indentation cracks reveals that the fracture toughness improves as a result of toughening mechanisms such as crack bridge, crack deflection, and microcracks.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Qiang Gao,Ping Hu,Yuxuan Xia,Yuan Cheng,Guangdong Zhao,Jiaxin Feng,Zibin Chen,Xinghong Zhang
Ultra-high temperature ceramic composites (UHTCCs) with low density and exceptional heat resistance are essential for hypersonic vehicle applications, enabling increased payload capacity and higher Mach numbers. However, developing a fabrication process that enables UHTCCs with both lightweight and superior thermal protection performance is still a challenge. To tackle this problem, in this study, a combinatorial process of vibration-assisted slurry impregnation and polymer infiltration pyrolysis was developed to fabricate gradient lightweight C f /ZrB 2 -SiC composites, consisting of continuous carbon fiber fabric, ZrB 2 -SiC and a carbon aerogels (CAs) layer. The resulting composites exhibit a low density of (0.62–0.96 g cm −3 ) but excellent oxidation and ablation resistance, which can withstand ultrahigh temperatures between 2100 °C and 2500 °C. The porous C f /CAs layer, with a density of 0.38 g cm −3 and specific bending and compressive strengths of 43.47 MPa/(g cm −3 ) and 15.53 MPa/(g cm −3 ), respectively, provides both structural integrity and lightweight properties to the C f /ZrB 2 -SiC composite. Furthermore, the density of the composites can be precisely tailored by adjusting the thickness of the C f /ZrB 2 -SiC layer, allowing for customized fabrication to meet diverse service environment requirements. This flexibility highlights the adaptability of the combined processing techniques. The unique combination of controllable low-density properties and exceptional oxidation and ablation resistance endows gradient lightweight C f /ZrB 2 -SiC composites are promising as lightweight, ultra-high temperature thermal protection systems for hypersonic vehicle applications.
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 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
·
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
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
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
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）