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
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
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
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
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
·
2022
·
IF 5.532
Mingcheng Zhu,Lan Zhang,Na Li,Desen Cheng,Jidong Zhang,Shiyao Yu,Hui Bai,Huizhong Ma
Ternary ZrB 2 –SiC–MoSi 2 composites with different nominal volume fractions of SiC (10–25 vol%) and MoSi 2 (5–20 vol%) were sintered by reactive spark plasma sintering (RSPS) at 1650 °C and 35 MPa from the starting powders of ZrB 2 , Si, Mo and activated charcoal. The densification behaviour, microstructures and mechanical properties were comprehensively investigated. SiC clusters and MoSi 2 were formed by in-situ reactions and the improved sintering efficiency was attributed to the mass transfer by liquid Si. The formation of a core–shell (Zr, Mo)B 2 solid solution was confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). With the addition of the nominal MoSi 2 content up to 15 vol%, the molar ratio of MoB 2 in the solid solution shell increased owing to the increase of Mo; the densification and mechanical properties decreased owing to the softness of MoSi 2 , the cracks, and the large size of SiC clusters. The relative density, Vickers hardness , and fracture toughness of ZrB 2 –SiC–MoSi 2 composites were significantly better than those of bulk ZrB 2 owing to the combined effect of phase enhancement and solid solution strengthening.
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
International Journal of Ceramic Engineering and Science
·
2020
·Vol. 2
·期 2
·101-109
·
IF 0
Anzhe Wang,Hailong Liao,Tao Zhang,Minqi Jiang,Fuxiao Guo,Yongzheng Wang
Reliable evaluation of the thermal shock behavior of sharp leading edges (SLEs) was hampered by a lack of available experimental method in past decades. Herein, a novel water spraying method was utilized to investigate the shape effect of ZrB 2 -SiC-Graphite SLEs during thermal shock. Experimental results indicated that the critical failure temperature of ZrB 2 -SiC-Graphite SLEs was most sensitive to the wedge angle, which could lead to a dramatic attenuation by about 35% from 12° to 9°, and was relatively little affected by the tip radius of curvature and the thickness. Simulation results further revealed that the decay of critical failure temperature was mainly due to the significant stress concentration caused by the reduction of wedge angle. Scanning electron microscopy observation proved that cracks tend to bypass graphite flakes due to their weak interfacial bonding, while branching always occurred when encountering hard phases or inclusions.
研究领域:
材料科学
·
热力学
·
结构力学
✓ 已验证
DOI
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Dongyang Zhang,Hongying Yu,Anzhe Wang,Qi Wang,Lu Ren,Ping Hu,Dongbai Sun
The need for synergy of strengthening and anti-oxidation under high-temperature and oxidative environment imposes new demands on nonablative thermal protection materials. Herein, 2D C f /ZrB 2 -SiC composite with superior damage tolerance and excellent oxidation resistance were constructed using a simple fiber heat treatment. An enhanced flexural strength of 234 ± 18 MPa and an intermediate work of fracture of 1342 J/m 2 were obtained for 2D C f-HT /ZrB 2 -SiC composite, increasing by nearly 19.4% and 171.7% as compared with those of C f-AR /ZrB 2 -SiC sample, triggered by multiple toughening mechanisms including crack bifurcation, fiber bundles pull-out and bridging. The surface of 2D C f-HT /ZrB 2 -SiC composite was covered with a dense silica glass layer and embedded with a few zirconia particles after oxidation at 1500 °C for 1 h, resulting in an excellent oxidation resistance. This work presents a simple approach to achieve the synergy of superior damage tolerance and oxidation resistance of continuous carbon fiber reinforced ceramic matrix composite.
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
·
2018
·
IF 3.057
Yehong Cheng,Yang Lyu,Shanbao Zhou,Wenbo Han
Although axially aligned fibrous monolithic ceramics have superior mechanical properties in ceramic fiber axial direction, the obvious anisotropy in physical and chemical properties of fibrous monolithic ceramics predetermine the significant on-axis and off-axis discrepancy. The existing ZrB 2 -based fibrous monolithic ceramics were all arranged by axially aligned ceramic fibers. Non-axially aligned ZrB 2 -SiC/ZrB 2 -SiC-graphene short fibrous monolithic ceramics with isotropic in-plane properties were fabricated by hot pressing of disorderly-arranged short ZrB 2 -SiC/ZrB 2 -SiC-graphene fibers to overcome in-plane anisotropy of the ZrB 2 -based fibrous monolithic ceramics. ZrB 2 -SiC/ZrB 2 -SiC-graphene short fibrous monolithic ceramics have remarkable increase in fracture toughness, critical crack size and work of fracture compared with ZrB 2 -SiC ceramics. The toughening mechanism of ZrB 2 -SiC/ZrB 2 -SiC-graphene short fibrous monolithic ceramics include macroscopic toughening of crack deflection, crack branching, interface friction and ZrB 2 -SiC cell extraction, and microscopic toughening of graphene bridging and pull-out.
研究领域:
材料科学
·
陶瓷
·
复合材料
·
力学性能
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zanchao Gao,Yumin An,Kailei Xu,Yehong Cheng,Libin Zhao
This study presents a novel fabrication strategy for unidirectional carbon fiber/ceramic films and integrates them with helical assembly, compression molding, and precursor infiltration and pyrolysis to construct a biomimetic Bouligand structure in ZrB 2 -SiC based composites. With a fixed helix angle of 30°, the influence of carbon fiber volume fractions (20 %, 30 %, 40 %) on the mechanical properties was investigated. The C f /ZrB 2 -SiC composites with 40 vol% carbon fiber exhibited the highest mechanical properties. Building upon this result, the effect of different helix angles (15°, 30°, 45°, 60°) on the mechanical properties was further investigated. The C f /ZrB 2 -SiC composite with 40 vol% fiber and a 60° helix angle sample exhibited the best overall mechanical performance, characterized by a flexural strength of 346.9 MPa, fracture toughness of 11.8 MPa·m 1/2 , and work of fracture of 5170.6 J·m −2 . SEM and CT analysis revealed that toughening was primarily attributed to crack deflection, microcracking, fiber pull-out, and bridging mechanisms.
研究领域:
材料科学
·
复合材料
·
机械工程
·
仿生学
·
陶瓷材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Jun Lu,Dewei Ni,Bowen Chen,Feiyan Cai,Zou Xuegang,Xiangyu Zhang,Yusheng Ding,Shaoming Dong
Pitch-based short carbon fibres reinforced C sf /ZrB 2 -SiC composites were fabricated by direct ink writing of short carbon fibres, followed by slurry impregnation and reactive melt infiltration . Ablation behaviour of the C sf /ZrB 2 -SiC composite was studied by air plasma test. It is indicated that the skeleton of the oriented short carbon fibres provides heat diffusion channels. Consequently, temperatures at the ablation surface are as low as ∼1730 o C and ∼2000 o C respectively at 4 MW/m 2 and 5 MW/m 2 . The composite presents outstanding ablation-resistant performance with a linear recession rate of ∼ − 0.04 µm/s and mass recession rate of ∼ − 3.40 mg/s at 4 MW/m 2 , ∼ − 0.17 µm/s and ∼ 3.58 mg/s at 5 MW/m 2 . It is revealed that the fibres area and matrix area of the composite present different ablation mechanisms. The fibres area is ablated severely, while the matrix area presents excellent ablation-resistance with continuous ZrO 2 -SiO 2 protective layer.
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
·
2018
·
IF 3.057
Dongyang Zhang,Ping Hu,Shun Dong,Qiang Qu,Xinghong Zhang
The high sintering temperature and interface interaction seriously degraded the toughening effects of continuous carbon fiber in ZrB 2 -SiC ceramic. The pyrolytic carbon coated carbon fiber reinforced ZrB 2 -SiC composite (C f-PyC /ZrB 2 -SiC) with desirable properties was successfully achieved via brushing nano ZrB 2 -SiC slurry followed by spark plasma sintering at relatively low sintering temperature. The fabricated C f-PyC /ZrB 2 -SiC composite presented a non-brittle fracture feature and a remarkable enhancement in comparison with the ZrB 2 -SiC composite reinforced by the as-received carbon fiber (C f-AS /ZrB 2 -SiC). The fracture toughness and critical crack size were increased from 5.97 ± 0.18–7.66 ± 0.24 MPa m 1/2 and from 91.6 to 164.5 µm, respectively. A high work of fracture of 1915 J/m 2 for C f-PyC /ZrB 2 -SiC composite was achieved, almost four times higher than that of the C f-AS /ZrB 2 -SiC composite (463 J/m 2 ). Multiple toughening mechanisms contributed to such enhancement, such as crack deflection, fiber bridging, fiber pull-out and crack branching. This work provides a feasible approach to fabricate high-performance fiber reinforced ceramic composites having a high work of fracture.
研究领域:
材料科学
·
工程学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）