JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 8
·5214-5223
·
IF 2.779
Zhang Dewei,Hui Yitao,Cai Junyao,Zhang Manlin,Xu Jianguang,Zhang Qinfang
Cu 3 SbS 4 -based compounds have received significant attention as a promising alternative for p-type thermoelectric materials due to their low-cost, earth abundant resource, and eco-friendly characteristics. However, the practical applications for waste heat utilization and solid-state refrigeration are still limited because of their low conversion efficiency. Herein, a high thermoelectric performance was realized in SiC nanoparticles-dispersed Cu 3 Sb 0.85 Bi 0.06 Sn 0.05 S 4 composites. SiC nanoparticles additives generate the interface potential barriers and increased energy-dependent carrier scattering, leading to enhanced power factor. Moreover, SiC nanoparticles significantly reduces the lattice thermal conductivity due to enhanced phonon scattering. As a result, a high ZT value of 0.61 is achieved at 573 K for the CASBT/0.05 wt % SiC sample, which is enhanced by 39% compared with the pristine sample. Meanwhile, an outstanding average ZT of 0.31 is obtained among the investigated temperature range. This work provides a feasible guidance for designing advanced thermoelectric materials.
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高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 17
·25045-25050
·
IF 4.527
Pingping Wang,Mengmeng Fan,Yuewen Zhang,Xin-Jian Li,Hongzhang Song
As a new type of clean and environmentally friendly energy material that can mutually transform thermal energy and electric energy, thermoelectric materials have received extensive attention from researchers. In this study, the traditional high-temperature solid-phase reaction method was used to prepare Bi 1.9 Ba 0.1 Sr 2 Co 2 O y + g wt% SiC ( g = 0, 0.025, 0.05, 0.1 and 0.15) polycrystalline samples. Ba element was used to substitute the Bi site of Bi 1.9 Ba 0.1 Sr 2 Co 2 O y , in an attempt to change the carrier concentration and raise its electrical transport performance. Then, based on Ba substituting, nano-SiC was introduced as the second phase to increase the grain boundary number, which would enhance phonon scattering and reduce its heat transport performance. Finally, the ZT value of Bi 1.9 Ba 0.1 Sr 2 Co 2 O y + 0.025 wt% SiC reaches 0.35 at 923 K, which is approximately 35 % higher than that of the pure sample Bi 2 Sr 2 Co 2 O y .
研究领域:
材料科学
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热电学
·
陶瓷材料
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能源材料
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高影响因子
CERAMICS INTERNATIONAL
·
2017
·Vol. 44
·期 6
·6037-6043
·
IF 2.986
Wenhu Hong,Ping Hu,Dongyang Zhang,Maosong Xie,Yang Yang,Shanyi Du
The ZrB 2 -SiC ceramics with homogenous microstructures were successfully fabricated by the optimized gel-casting method and pressureless sintering. The effects of the processing parameters, including the monomer content, cross-linker/monomer ratios, initiator addition, catalyst concentration and polymerization temperature, on the final gel properties were systematically investigated. The rheological behavior and stability of ZrB 2 -SiC suspensions were evaluated, and the microstructures and mechanical properties of sintered ceramics were also analyzed. The homogenous gel networks containing low monomer content (4 wt%) and without catalysts had been successfully obtained, which could be mainly attributed to the homogeneous distribution of crosslinking points and temperature-induced gelation . The crack-free and complex-shaped ZrB 2 -SiC ceramic composites were achieved by the optimized gel-casting, which could reach the highest relative density of 97.2% and the flexural strength of 402 ± 57 MPa, respectively. This study provides an optimized gel-casting process for fabricating ZrB 2 -SiC ceramics with excellent properties by low colloidal additives and without catalysts.
研究领域:
材料科学
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陶瓷工程
·
复合材料
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Manyu Zhang,Binbin Wu,Mingzhu Peng,Jinwen Yang,Yukun Ding,Guangchi Wang,Jun Wang,Qingwei Jiang,Peng Wu,Xiaoyu Chong,Jing Feng
An ideal thermal barrier coating (TBC) material requires high fracture toughness to suppress crack initiation and propagation and excellent wear resistance to withstand abrasion under the conditions of ultra-high temperature, high pressure, and severe gas erosion. Although rare-earth tantalates are promising materials for TBCs, their low fracture toughness and high wear rates limit their application under extreme operating conditions. Here, SiC whiskers (SiC w ) are introduced into YTaO 4 to optimize both fracture toughness and wear resistance through crack deflection, whisker bridging, and whisker pull-out mechanisms. The results demonstrate that SiC w , as a second phase, can increase the fracture toughness of YTaO 4 by 146% and reduce the wear rate by 69.16%. Compared to traditional TBC materials, SiC w -reinforced YTaO 4 composites exhibit higher fracture toughness and lower wear rates, significantly extending the service life of YTaO 4 TBCs. Download: Download high-res image (456KB) Download: Download full-size image
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高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Zhigang Yi,Xiangnan Chen,Shaoxi Zhang,Ruohao Li,Qiong Tang,Guangjun Gou
Conventional design for the electromagnetic absorbing material often struggles to balance the structural stability and electromagnetic loss. Interfacial regulation is key to reconciling structural stability and electromagnetic absorption. Thus, it is proposed in this paper to construct carbonized polyaniline coated SiC hybrids. Dense interfacial layers are introduced to achieve enhanced thermostable electromagnetic absorptions. Whether the hybrids maintain stable electromagnetic absorption after aging through calcination were investigated. The C-PANi/SiC exhibits significantly boosted electromagnetic absorption with the optimal reflection loss reached −43.70 dB at 4.40 GHz. Furthermore, C-PANi/SiC demonstrates excellent thermal stability, and the optimal reflection loss of C-PANi/SiC-3 h maintains −50.58 dB with broaden effective absorption bandwidth of 4.76 GHz under the thickness of 1.8 mm. The confined orientation of C-PANi on SiC and strong interfacial hybridizations are found out critical to the synergistically improvement in thermostable electromagnetic absorption. This work provides guidance to developing novel multi-functional electromagnetic absorbing materials.
研究领域:
材料科学
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电磁学
·
纳米技术
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高分子科学
·
表面工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jinzhu Zou,Huiwen Xiong,Yujuan Huang,Zhiguo Wang,Jianhui Wen,Wen Du,Jun Cao
In order to control the pore characteristics and macroscopical performance of porous ceramics , roles of the freeze casting parameters are the key points. Herein, aligned dendritic porous SiC was fabricated by freeze casting of PCS-camphene solutions with different solid loading, freeze front velocity, temperature gradient , and freezing temperature. Influence of these parameters on the microstructure and compressive strength of porous SiC was investigated. With increasing the PCS content, freeze temperature, freeze front velocity or temperature gradient, degree of undercooling of the camphene was increased, resulting in the formation of smaller pore size, decreased porosity and increased compressive strength . Compared to variables of freeze temperature and temperature gradient, increased freeze front velocity was more efficiency in improving the compressive strength of porous SiC, owing to the formation of smaller pore size and longer secondary dendritic crystals. Promising micron-sized porous SiC with high porosity (79.93 vol%) and satisfactory strength (15.84 MPa) was achieved for 10% PCS-camphene solution under optimized freezing conditions.
研究领域:
材料科学
·
陶瓷工程
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 9
·e71229
·
IF 4.2
Shaoheng Zhang,Gaoming Mo,Haijun Chen,Qing Huang
Silicon carbide (SiC) fibers are indispensable reinforcements for ceramic matrix composites (CMCs) in extreme environments. However, achieving near-stoichiometric SiC compositions with low oxygen content and a dense microstructure still remains a challenge. This study introduces a novel fabrication route for producing near-stoichiometric crystalline SiC fibers. This approach utilizes polyborocarbosilane (PBCS) and polyaluminoborocarbosilane (PABCS) precursors, synthesized from liquid polysilacarbosilane (PSCS), o -carborane, and aluminum acetylacetonate (Al(acac) 3 ) via a high-temperature/pressure method. Our findings show that incorporating o -carborane markedly accelerates polymerization kinetics under mild conditions (360°C–380°C). Boron (B) is integrated into the polycarbosilane (PCS) molecular structure through the formation of B─Si and B─C bonds, resulting from reactions between Si-H, Si-CH 3 , and B-H groups. Continuous precursor fibers are successfully melt-spun by tailoring precursor properties. These fibers can be oxidatively cured under milder conditions (100°C, 1–2 h) due to an elevated concentration of Si radicals. Subsequent pyrolysis and sintering of both PBCS- and PABCS-derived cured fibers yield near-stoichiometric crystalline SiC fibers with low oxygen content and a dense structure. We observed that the formation of B─C/B─Si bonds promotes densification of the SiC fibers. Notably, PABCS-derived SiC fibers exhibit superior densification compared to PBCS-derived fibers, attributed to the synergistic sintering effects of boron and aluminum, potentially mediated by the formation of boron, aluminum, and their respective eutectic liquid phases.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jianlong Chai,Yabin Zhu,Lijuan Niu,Tielong Shen,Minghuan Cui,Zhiguang Wang
Al 2 O 3 /ZrO 2 /SiC ceramic composites with different SiC contens have been prepared by hot pressuring. The effect of SiC content on the microstructure and mechanical properties of composites have been studied. The results show that SiC has obvious grain refinement effect on ZTA ceramics and change the fracture mode of the matrix from intergranular fracture to transgranular fracture . Simultaneously, it has been found that the mechanical properties of the material are significantly enhanced in comparison with ZTA matrix. The highest strength is acquired at 10% SiC content, the flexural strength and toughness are obtained when the SiC content is 15 vol%, and the values are 18.86 GPa, 1262 MPa and 6.13 MPa m 1/2 , respectively. The mechanisms of hardening, strengthening and toughening have been discussed.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 18
·1-13
·
IF 2.8
Li Chaojie,Feng Yonghang,Cui Yi,Zhang Fan,Lv Dongfeng,Liu Pan,Wei Yingna,Wei Hengyong,Bu Jinglong
The NiCo 2 O 4 nanoflakes/SiC fibers composites were prepared by electrospinning, carbon thermal reduction combined with hydrothermal method. The results of SEM, XRD and XPS suggested that the NiCo 2 O 4 nanoflakes/SiC fibers composites were successfully prepared. The NiCo 2 O 4 nanoflakes were generated on the surface of SiC fibers with uniform distribution and loose structure. The NiCo 2 O 4 nanoflakes/SiC fibers composites possess the porous structure and their BET specific surface area is 233.2 m 2 /g. The BJH average pore size and the pore volume are 7.0 nm and 0.4 cm 3 /g, respectively. The structure of fibers and pores can bring the multiple reflections and scatterings, interface polarizations, dipole polarizations and conductivity losses. In addition, there is the synergistic effect of dielectric loss and the magnetic loss in NiCo 2 O 4 nanoflakes/SiC fibers composites. Therefore, the reflection loss of NiCo 2 O 4 nanoflakes/SiC fibers composites could achieve − 56 dB under the thickness of 6 mm at 17.64 GHz, which showed the better microwave absorption behavior than SiC fibers.
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高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 20
·期 6
·3754-3765
·
IF 2.1
Quan Li,Zhicheng Wang,Yang Wang,Jian Yang
High-density Si 3 N 4 -SiC ceramic nanocomposites have exceptional mechanical properties, but little is known about their electromagnetic wave absorption (EMA) capabilities. In this paper, the effects of sintering temperature and starting material compositions on the dielectric and EMA properties of hot-pressed Si 3 N 4 -SiC ceramic nanocomposites were investigated. The real and imaginary permittivities of Si 3 N 4 -SiC ceramic nanocomposites increase with increasing sintering temperature or SiC content, particularly at the sintering temperature of 1850°C and SiC content of 50 wt.%. This is primarily due to the improvement of interfacial and defect polarizations, which is caused by the doping of nitrogen into the SiC nanocrystals during the solution-precipitation process. The real and imaginary permittivities of Si 3 N 4 -SiC ceramic nanocomposites show decreasing trends as sintering aid content increases. Si 3 N 4 -SiC ceramic composites have both good EMA and mechanical properties when they are sintered at 1850°C with 30 wt.% SiC and 5–8 wt.% sintering aids. The minimum reflection loss and maximum flexural strength reach -58 dB and 586 MPa, respectively. Materials with multilayered structural designs have both strong and broad EMA properties.
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高影响因子
Materials
·
2022
·Vol. 15
·期 8
·2757
·
IF 3.748
Yun Liu,Long Ma,Runa Dong,Kexin Cui,Yongzhao Hou,Wen Yang,Yeqing Liu,Cheng Zhong,Guangwu Wen,Lijuan Zhang
Cf/C-SiC composites have become the preferred material for high-temperature load-bearing applications because of their low density, high strength, and excellent thermal-physical properties. Due to the composite’s poor sintering performance, the sintering temperature and pressure required for the preparation of Cf/C-SiC by traditional methods are also relatively high, which limits its engineering application. Herein, based on the precursor-derived ceramic route and C/C composites material preparation process, a binary binder (coal pitch and polysilylacetylene) is developed, which combines a carbon source, SiC precursor, and semi-ceramic SiC filler organically. Then, the SiC phase was successfully introduced into C/C composites by the slurry impregnation-hot pressing sintering method. The prepared Cf/C-SiC composites showed good mechanical properties, with a density of 1.53 g/cm3and a bending strength of 339 ± 21 MPa. Moreover, the effects of the binary binder on the microstructure, density, and mechanical properties of Cf/C-SiC composites were investigated. This work provides a novel and effective approach to fabricating Cf/C-SiC composites with low density and high strength.Keywords:Cf/C-SiC composite;binary binder;SiC precursor;coal pitch
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PubMed
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 14
·2200333
·
IF 6.389
Xiaoyan Yuan,Huanhuan Li,Aiming Sha,Shengyan Huang,Bo Li,Shouwu Guo
Materials with 1D structure exhibit a remarkable advantage for losing electromagnetic (EM) wave energy. Herein, flexible Mo 2 C-modified SiC/C nanofibers (Mo-SiC/C NFs) are synthesized for the first time by co-electrospinning and subsequent high-temperature pyrolysis, using polycarbosilane (PCS) and molybdenum acetyl acetone (MoO 2 (acac) 2 ) as precursors. It is found that the polymer derived temperature of PCS is significantly decreased by introducing MoO 2 (acac) 2 , as well as endowing the SiC/C NFs with good flexibility, high crystallinity, and remarkable microwave absorption performance. The as-prepared fibers dispersed in paraffin with a low filler loading (15 wt%) exhibit a minimum reflection loss (RL, dB) of -62.5 dB, and a wide effective absorption bandwidth (EAB, RL<-10 dB) of 6.8 GHz at 2.75 mm. Meanwhile, the EAB of the hybrid can cover the whole X-band and most of the C-band by modulating its thickness. These high-efficient performances mainly originate from the specific 1D microstructure, abundant interfaces and defects, and synergistic effect among SiC, Mo 2 C, and C matrix. Thus, this work offers a way to explore flexible SiC/C NFs as a promising candidate with lightweight and wide EAB for EM wave absorption.
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高影响因子
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