JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Ruiji Zhang,Xing Zhang,Chen Xing,Li Hu,Fangwei Guo,Xin Wang,Xiaofeng Zhao
The thermal cycling lifetime of thermal barrier coatings was doubled when deposited by electro-sprayed (ESP) microspheres instead of by commercial hollow spherical powders. It was believed that partial-molten nodules with featured microstructures inherited from the feedstock microspheres were the main contributor for prolonged thermal cycling durability due to improved fracture toughness and strain tolerance. The maximum lifetime was observed on samples with 20−30 vol.% of partial-molten microspheres. The hierarchy pores may both slow down the crack propagation by triggering multi-deflecting and promote cracking by reducing the tendency of interfacial deflection, the net effect depends on situation. The ESP coatings exhibited bimodal Weibull moduli upon indentation, which was regarded as originated from the hierarchy porous structure. Finally, the criterion was verified by micro-indentation and residual stain-stress evaluation by Raman spectroscopy .
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 THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Anzhe Wang,Shuai Wang,Peng Zhou,Zhen Zhang,Yajie Dai,Dongyang Zhang
The fatigue behavior of a ZrB 2 -based ceramic containing SiC and graphite was compared to a ZrB 2 -SiC reference material based on bending testing, quantitative calculations as well as crack growth and fracture characterization. The addition of graphite flake makes ZrB 2 -SiC-Graphite ceramics exhibit fatigue failure behavior at very high stress level (93% of the characteristic strength , σ 0 ), owing to the increased K Ic promoted by crack deflection, bridging, bifurcation and pull-out of graphite, while the fatigue behavior of ZrB 2 -SiC appears when the maximum stress is below ~86% σ 0 . However, both the slow crack growth exponents of the graphite containing ceramic, n and nc values, which reflect the fatigue resistance in static and cyclic fatigue conditions, respectively, are only 1/4 as compared to the reference graphite-free ceramic. This may be due to the weak boride/graphite interfaces, which lead to the decrease of the initial critical stress intensity factor ( K c-initial ) value from 2.6 to 2.0 MPa m 1/2 .
研究领域:
材料科学
·
工程力学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Ruitong Chi,Zhuowei Zhou,Zhixiao Zhang,Haiping Zhao,Yu Dong,Yafeng Wang,Yusen He,Yanming Wang,Xiaorong Zhang
In this study, a novel closed spherical-shell-shaped toughening phase morphology is purposely constructed within Al 2 O 3 ceramics. The continuous Al 2 O 3 matrix is segregated by the TiC x O y N z spherical shells, with both the interior and exterior of each shell maintaining the Al 2 O 3 phase. Such spherical shells with the thickness of approximately 150 nm are comprised of submicron-sized TiC x O y N z grains in stack. Accordingly, such hierarchical microstructure gives rise to a multidimensional crack propagation mode in which cracks repeatedly expand along the external and internal interfaces of TiC x O y N z spherical shell and Al 2 O 3 ceramic matrix on a microscaled level, as well as across TiC x O y N z grain interfaces within the shell layer on a submicron scale. This synergistic action significantly increases crack propagation resistance through continuous energy dissipation at multiple length scales. Consequently, the Al 2 O 3 -TiC x O y N z composite ceramic achieves a remarkable fracture toughness of 6.47 ± 0.21 MPa m 1/2 . This work provides a novel strategy for designing high-performance Al 2 O 3 ceramics through engineered toughening phase morphology.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
MACROMOLECULES
·
2025
·
IF 5.2
Jing Zhao,Dongmin Cheng,Ran Chen,Xinyi Yang,Yiluo Li,Yuejin Guo,Jingxia Zhang,Ruofei Hu,Junping Zheng
The current strategies prove to be hard for the preparation of polysaccharide-based gels with excellent mechanical properties and high crack propagation resistance. Herein, ultrahigh stretchable polysaccharide-based polyacrylamide/carrageenan/phytic acid (PCP) gels are prepared by integrating strong and dense hydrogen bonds into the network. The phosphate ester bonds contained in phytic acid form strong and dense hydrogen bonds with polyacrylamide and carrageenan, which are 18.6 times higher than those in gel without phytic acid. A large number of hydrogen bonds endows PCP gels with ultrahigh stretchability (>16,000%, without breakage), unprecedented crack propagation strain of 16,000%, high adhesion property (223 kPa), self-healing ability, low-temperature resistance, and moisturizing property. Furthermore, PCP gel can be obtained rapidly and facilely within minutes, integrated into clothes after a facile drawing method, and applied to monitor movement, breathing, and temperature states (e.g., contactless recognition for finger/palm, distinguishing between running phone/nonrunning phone). This study provides an essential strategy for designing or fabricating highly stretchable gel and its application in the wearable electronics field.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhuo Chen,Xiufang Cui,Xiang Wang,Yongzhi Jing,Xinhe Wang,Yongchao Fang,Zhijia Zhang,Qicheng Li,Dechang Ma,Guo Jin
The high-entropy ceramic (HEC) (La 0.35 Gd 0.35 Y 0.35 Sm 0.35 Yb 0.6 )Zr 2 O 7 has emerged as a strong candidate for thermal barrier coatings (TBCs) due to its exceptional thermal properties. We investigated the thermal shock resistance of HEC–lanthanum zirconate (LZ)/yttria partially stabilized zirconia (YSZ) (i.e., the HEC coating) and LZ/YSZ (i.e., the LZ coating) double-ceramic-layer TBCs fabricated via plasma spraying. During thermal shock testing at 1100 °C, the LZ coating failed after 60 ± 3 cycles, while the HEC coating had a considerably longer thermal cycling lifetime of 135 ± 5 cycles. The HEC coating's superior performance is attributable to its enhanced oxygen barrier properties and inherent lattice disorder; the former reduced the growth rate of the thermally grown oxide, and the latter increased lattice defects and distortion. These factors helped improve the thermal expansion coefficient and reduced interlayer thermal stress accumulation. Furthermore, the higher fracture toughness of the HEC layer impeded crack propagation, collectively enhancing the TBCs' thermomechanical shock resistance. These findings underscore the potential of (La 0.35 Gd 0.35 Y 0.35 Sm 0.35 Yb 0.6 )Zr 2 O 7 as a robust material for extending the service life of TBCs in high-temperature environments.
研究领域:
材料科学
·
热力学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yufei Tang,Xuan Zhou,Qi Zhang,Lei Chen,Kang Zhao,Zixiang Wu
Directional lamellar porous titanium scaffolds are widely used as bone implant bearing materials because of their anisotropic pore structure . Their mechanical properties can be effectively improved by enhancing the strength of pore walls through the introduction of ceramics. In this work, porous titanium implants were prepared by freeze casting combined with TiH 2 decomposition. The graphene was introduced into the pore walls of porous titanium, which could transform into titanium carbide (TiC) in situ upon sintering. TiC was evenly distributed in the lamellar pore walls, and the interface was well bonded. The compression strength of the fabricated implants was up to 389.94 MPa when the graphene content was 3 wt%, which was 377.8% times as high as the porous titanium. The crack propagation was resisted by TiC because of the “pinning” effect on the pore wall. Some of TiC were pulled out from the matrix, and others were fractured. The strength of the fabricated implants was improved significantly by the large consumption of fracture energy. Also, fabricated porous titanium implants with TiC are suitable for bone implantation.
研究领域:
生物材料学
·
医学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Ping Hu,Yuan Cheng,Peng Wang,Xiang Guo,Chen Ma,Qiang Qu,Xinghong Zhang,Shanyi Du
Inspired by natural exoskeleton composites in arthropods consisting of regularly oriented fibrous chitin within continuous matrices, a novel rolling compacted method was developed to enable controlled orientation of carbon fibers in UHTCs. Using rolling compaction, carbon fibers were arranged in ZrC-SiC matrix along highly consistent direction, in which ceramic powders were uniformly introduced into intrafascicular and interfascicular spaces of fiber bundles. The fabricated C f /ZrC-SiC composite revealed an extendedly graceful fracture pattern and stably impeded crack propagation with a flexural strength and fracture toughness at 227 ± 3 MPa and 5.46 ± 0.14 MPa m 1/2 . An exceptional work of fracture of 3244 ± 76 J/m 2 was achieved, one order of magnitude higher than those of UHTCs, attributed to toughening mechanism of oriented carbon fibers such as fiber pull-out and bridging accompanied by crack deflection and termination. This work provides an easily feasible way to tailor mechanical performance for fiber-reinforced composites through site-specific optimization of fiber orientation .
研究领域:
材料科学
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2022
·
IF 6.044
Mingyong Jia,Fei Chen,Yueqi Wu,Like Xu,Qiang Shen,Nan Jiang,Jian Sun
The metallization of AlN ceramic is a critical prerequisite for applying AlN ceramics to electronic component packaging. In this study, a concept of functionally graded materials (FGMs) was used for the metallization of AlN ceramic. Symmetrical Mo/AlN/Mo FGMs with different composition exponent p ( p =1, p <1, and p >1) were designed and fabricated by hot-press sintering. The influence of the p -value on the shear performance and fracture path of the Mo/AlN/Mo FGMs was investigated. Compared to specimens with p =1, the specimens with p <1 and p >1 show the distribution of Mo-rich and AlN-rich in the graded transition layer, respectively. The shear strength of the specimens reaches a maximum value of 48.0 MPa as p < 1 and 22.5 MPa higher than the minimum value as p > 1. Besides, three fracture paths were found for the Mo/AlN/Mo FGMs with different values of p , including the cracks propagate obliquely along the axis in the graded transition layer, the cracks penetrate through the AlN ceramic and the graded transition layer, and the cracks only propagate horizontally in a single graded layer. The crack initiation of Mo/AlN/Mo FGMs depends on the strength of each graded layer. Moreover, the directions of fracture paths are closely related to the strength of the ceramic interlayer and the composition exponent p .
研究领域:
材料科学
·
工程学
✓ 已验证
DOI
高影响因子
EUROPEAN PHYSICAL JOURNAL E
·
2014
·Vol. 37
·期 9
·1-7
·
IF 2.183
Zhang Yongjian,Qian Yimeng,Liu Zhengtang,Li Zhiguang,Zang Duyang
Abstract. The cracking behavior accompanied with the drying of colloidal droplets containing polytetrafluoroethylene (PTFE) nanoparticles was studied. During evaporation, due to the stretching effect of the liquid zone, the receding wet front leads to the formation of radialized surface wrinkling in the gel zone. This indicates the building of a macroscopic stress field with a similar distribution. As a result, the cracks in the deposited films are in a radial arrangement. The propagation velocity of the cracks depends on the thickness of the film, ∼ H
3/5 . In addition, sodium dodecylsulfate (SDS) additives can be used to tune crack behavior by causing a reduction of the capillary force between particles. The results highlight the significance of the receding wet front in building the drying deposition stress field and may be helpful in other fields related to drying and cracking processes. Graphical abstract
研究领域:
胶体科学
·
软物质物理
·
材料表面工程
·
干燥动力学
·
薄膜沉积
✓ 已验证
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Xiangyang Wang,Xiu-Zhi Tang,Xiaoping Hu,Pengfei Wang
Since high-speed collisions often give rise to catastrophic damage, investigating the enhancement and dynamic behavior of composites is essential. Herein, graphene oxide (GO) and its surface-modified derivative were separately incorporated into the polyurethane matrix and their dynamic mechanical properties were examined and compared. A drop-weight dynamic tension device was used to characterize the mechanical properties of composites. The collected results show significant improvement in failure strength while incorporating GO as the nanofiller. And, the slightly reduced graphene oxide (SRGO) grafted with polyethyleneimine (SRGO-PEI) is beneficial in improving the plastic stress. The high-speed deformation process reveals severe strain localization before the break. The morphology of fracture surfaces indicates the SRGO-PEI plays a vital role in hindering crack propagation . Then the constitutive equation was derived to describe the stress-strain curves of modified polyurethane films. This work involves the synergistic effect between surface modification of nanofillers and the dynamic behavior of polymer-based composites, which could be regarded as a guideline for designing the composites under high-velocity impact environments.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yingjie Shi,Weixing Li,Xiaorong Zhang,Wenjie Yang,Jingbo Mu,Yu Dong,Hongwei Che,Yanming Wang,Yafeng Wang,Zhixiao Zhang
Core–shell structural B 4 C@TiB 2 composite powders were synthesized via the molten salt method using micron-sized B 4 C and TiH 2 powders as raw materials. Furthermore, a SiC composite ceramic with B 4 C@TiB 2 core–shell structural units as the toughening phase was prepared by spark plasma sintering using SiC powder and the obtained B 4 C@TiB 2 composite powder as starting powders. The effects of calcination temperature and raw material ratio on the phase compositions and microstructure of the B 4 C@TiB 2 composite powders were studied, and the synthesis mechanism of the B 4 C@TiB 2 composite powder was explored. The formation mechanism of B 4 C@TiB 2 core–shell toughening units inside the SiC matrix was investigated, and the toughening mechanism of the SiC–B 4 C@TiB 2 composite ceramic was discussed. Results show that the B 4 C@TiB 2 core–shell units in the SiC matrix can induce a complex crack propagation mode and consume abundant crack propagation energy. Therefore, a high fracture toughness of 6.47 ± 0.32 MPa m 1/2 is realized for the SiC–B 4 C@TiB 2 composite ceramics.
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 MATERIALS SCIENCE
·
2023
·Vol. 58
·期 7
·3025-3037
·
IF 4.5
Zhang Kai,Sun Yinjie,Hou Sifan,Li Guoqi,Fan Jinpeng
Multi-scale BN/SiC ceramic with high toughness was successfully prepared by vacuum-assisted filtration. The BN/SiC ceramic bulk is composed of macroscopic laminated structure and microscopic brick–mortar structures in layer. In this ceramic, improving toughness relies on the design of multi-scale structure. The ordered arrangement of BN sheets and SiC form a ceramic layer with a structure similar to brick and mortar. At the same time, the SiC layer and BN/SiC layer are alternately arranged by layer-by-layer deposition method to form the macro-layer structure. The thickness of SiC layer and BN/SiC layer is only about 74 μm and 7.6 μm, respectively. The mode of crack propagation changed with the change in the structure and variation of BN content in the BN/SiC layer. The delamination cracks occurred inside the BN/SiC layer or at the interface between SiC and BN/SiC layers. The BN/SiC laminated ceramic possesses high toughness (9.37 MPa m 1/2 ) when the BN content is 20wt.%, which is much higher than that of pure SiC bulk (3.45 MPa·m 1/2 ).
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）