CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Fan Zhang,Dewei Ni,Bowen Chen,Feiyan Cai,Hongda Wang,Le Gao,Ping He,Yusheng Ding,Shaoming Dong
Ultrahigh temperature and long-term ablation-resistant properties are critical and challenging for the utilization of materials as the thermal components of hypersonic vehicles. In this work, Y 2 O 3 reinforced C f /HfB 2 -SiC composites are designed and fabricated, which present superior ablation resistance with a mass recession rate of 2.10 mg/s and linear recession rate of 0.67 μm/s (with 3 wt% Y 2 O 3 addition) under long term ablation at a heat flux of 5.5 MW/m 2 (up to ∼ 2700 °C) for 300 s. The long-term ablation mechanisms of the composites are studied and revealed with the help of a detailed microstructure analysis and thermodynamic considerations. It is indicated that Y 2 O 3 reacts with both HfO 2 and SiO 2 , leading to the formation of a stable oxide layer with small HfO 2 -based grains skeleton dispersed in HfO 2 -Y 2 O 3 -SiO 2 glassy phase, subsequently improving the ablation-resistant performance of the composites. This work inspires new strategies for further optimization of ablation resistance of ultra-high temperature ceramic matrix composites.
研究领域:
材料科学
·
航空航天工程
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产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2025
·
IF 6.6
Yuanming Zhou,Mingyang Li,Shuxin Li,Shuangxing Zhu,Ruizhi Liu,Maozhong Yi,Ke Peng
The oxide layer that forms on the surface of C/C composites matrix-modified with multiphase ultra-high temperature ceramics is generally loose and poorly bonded, limiting its effectiveness in enhancing the ablation resistance of C/C composites. In this study, C/C composites were matrix-modified using solid solution ceramic TaZr 2 C 3 -SiC and multiphase ceramic TaC-2ZrC-SiC, both with the same Zr/Ta ratio. The C/C-TaZr 2 C 3 -SiC and comparative sample C/C-TaC-2ZrC-SiC composites were prepared through a high-solid-loading slurry impregnation method combined with a precursor infiltration and pyrolysis process. The flexural properties were evaluated, and ablation tests were conducted under an oxyacetylene flame. Compared to C/C-TaC-2ZrC-SiC, the C/C-TaZr 2 C 3 -SiC sample exhibited superior flexural properties and ablation resistance. The flexural strength, elastic modulus, and fracture toughness improved by 10.80%, 29.75%, and 37.67%, respectively. The mass and linear ablation rates were reduced by up to 85.49% and 77.26%, respectively. The superior ablation resistance of C/C-TaZr 2 C 3 -SiC was attributed to the formation of the anti-ablation microstructure composed of the Ta-rich oxide binder phase and Zr-rich oxide skeleton phase in the Ta-Zr-O oxide layer. The microstructure enhanced the viscosity of the oxides and strengthened their interfacial bonding, effectively suppressing the splashing and consumption of surface oxides under high heat flux while preventing their accumulation in the brim ablation region. The oxide layer was more compact and tightly bonded to the composite surface, providing the composites with significantly improved ablation protection. These findings provide a novel and effective approach for further improving the ablation resistance of C/C composites.
研究领域:
材料科学
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航空航天工程
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产品关联
DOI
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Fuping Li,Wei Zheng,Yue Wang,Wei Dang,Zhuoli Xu,Xinyuan Zhang,Kang Zhao,Zhenyi Yuan,Yufei Tang
Polycarbosilane-derived (PCS-derived) coating containing SiC fillers with enhanced adhesive strength and corrosion resistance were fabricated on Q235 steel by a simple method of dip coating . The effects of content and particle size of SiC fillers on the phase composition, surface morphology , adhesive strength and corrosion resistance of PCS-derived coatings were studied. Addition of SiC fillers could reduce the microcrack width on the coating surface . The microcrack width decreases with the decrease in particle size of SiC fillers. Addition of 2.5 wt% SiC fillers with particle size of 30 nm could make the coating surface crack-free. Different from particle size, the effect of filler content on the microcracks has a moderate value which is corresponding to lower microcrack width. In addition to the microcracks, SiC filler content and particle size have significant effects on the adhesive strength between coatings and substrates. The higher adhesive strength is 319.1 MPa for coatings fabricated with a particle size of 500 nm and a content of 10 wt%. SiC fillers can improve the corrosion resistance of the PCS-derived coatings. In comparison with particle size of filler, filler content has a greater effect on the corrosion resistance of the coatings. The corrosion mechanism was analyzed. Appropriate content of fillers reduce the microcrack width and further improve the corrosion resistance of the coatings.
研究领域:
材料科学
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腐蚀与防护
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Linying Huang,Hui Wang,Qin Ouyang,Gaoming Mo,Jing Huang,Yueqing Zheng,Qing Huang
Polymer-derived silicon carbide (SiC) fibers are excellent structural and functional materials for extreme environments. However, the low efficiency of the curing process and the inferior stability of the amorphous SiC x O y phase have limited their large-scale preparation and widespread application. In this study, phenylboronic acid (PBA)-modified polyaluminocarbosilane (PACS) electrospun fibers were cured efficiently via an electron beam irradiation oxidation technique, and then converted into highly crystalline SiC fibers with low oxygen content by high-temperature sintering. The combination of irradiation oxidation and subsequent annealing treatment facilitated the effective, rapid, and sufficient curing of PACS fibers. Notably, boron played a significant role in inhibiting the growth of SiC grains and promoting the graphitization of free carbon. The SiC fibers obtained from PBA-modified PACS through irradiation oxidation curing exhibited superior electrical conductivity and microwave absorption performance, achieving a minimal reflection loss (RL) of −41.8 dB at 12 GHz with a thickness of 1.5 mm. This work provides an effective method for preparing SiC fibers with tunable carbon structures and enhanced microwave absorption properties, thereby paving a way for expanding their applications.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Rongrong Du,Hongyang Zhu,Shuo Wang,Hongyao Zhao,Mengting Liu,Yanyun Wang,Yiyan Song,Fu Yang
Photothermal nanomaterials have showed great potential for development in simultaneous pollutant purification and freshwater recovery. In this study, a novel composite composed of hollow N-doping SiC porous hybrid network with the integration of CoCu bimetal species was constructed by a simple self-assembly and temperature-modulated approach. Such a hollow porous hybrid nanoreactor is endowed with abundant synergetic CuCo bimetallic reactive sites and polar pyrrolic N sites, which improves the enrichment of pollutants and intermetallic redox pairs. Ultrafine nanocrystals corresponding to Co 2 SiO 4 over the hybrid framework can be evidenced by HRTEM technique. The experimental results showed that the optimal CoSiCu-6 degraded norfloxacin (NFX) by 90.7% in 10 min with a pseudo-first-order rate constant of 0.493 min −1 , which was about 6.49 folds enhancement compared to Cu-free CoSi-6 counterparts, achieving a low reaction activation energy (18.02 kJ mol −1 ) during the reaction. Control experiments including anion interference and broad applicability for pollutants degradation were further explored, emphasizing the excellent performance of CoSiCu-6 in the practical contaminant removal. The mechanism study showed that, single linear oxygen ( 1 O 2 ) coupled with electron-transfer process work as the main activation routes dominating the degradation process. In addition, Co 3+ /Co 2+ /Cu 2+ redox pairs and oxygen vacancies (O v ) play a key role in the PMS activation process. The obtained optimal catalyst was further explored for solar-driven photothermal interfacial water evaporation, showing a rational cleanwater recovery efficiency (∼1.3 kg m −2 h −1 ) from the polluted wastewater. In addition, monolith floatable evaporator was constructed by anchoring CoSiCu-6 onto a tailored melamine sponge foam via a calcium ion-triggered sodium alginate cross-linking strategy, affording an excellent evaporation performance (2.16 kg m −2 h −1 ) and coupled norfloxacin degradation efficiency (93.6%, within 5 min). This innovative monolithic evaporator made of CoCu integrated SiC hybrid nanosphere has a powerful dual function of rapidly degrading pollutants and facilitating solar-powered regeneration of contaminated wastewater due to its unique hollow porous structure and the CoCu bimetallic synergistic action that provides a rich set of reaction sites, which is promising for the treatment of complicated wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2024
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IF 5.3
Tongguo Huo,Dan Zhu,Jianxin Zheng,Yuan Lin,Yu Dai,Jian Wu
This study systematically investigated for the first time the effects of varying the temperature, pressure, C/Si molar ratio, and H 2 /Si molar ratio on β-SiC coatings produced via chemical vapor deposition (CVD) using the SiCl 4 –CH 4 –H 2 –N 2 system. Thermodynamic theoretical calculations were performed using the HSC Chemistry software. The temperature and C/Si molar ratio considerably affected the morphology, phase, and composition of β-SiC coatings. High-quality β-SiC coatings along the (111) crystal plane exhibiting a uniform surface, high density, low roughness, and good crystallinity were successfully synthesized at 1523.15 K and 200 Pa with a C/Si molar ratio of 1.0 and H 2 /Si molar ratio of 6.5. Additionally, when N 2 was used as the dilution gas instead of Ar, the resulting β-SiC coatings demonstrated reduced roughness, fewer free carbon, increased hardness (37.05 GPa vs. 39.19 GPa), enhanced modulus of elasticity (237.26 GPa vs. 264.24 GPa), and superior coating adhesion (16.48 MPa vs. 18.29 MPa).
研究领域:
材料科学
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表面工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yuan Cheng,Chang Liu,Ping Hu,Boqian Sun,Peitao Hu,Chen Ma,Cheng Fang,Dongyang Zhang,Jiaxin Feng,Shanyi Du
Graceful toughness and high strength are mutually exclusive in engineering ZrC-SiC ceramic, which are hard to be possessed simultaneously. Here, the pyrolytic carbon (PyC) coated short chopped carbon fibers were utilized to toughen ZrC-SiC ceramic, tackling the dilemma between toughness and strength. Through the uniform incorporation of PyC coated short chopped carbon fibers, the penetration crack mode of ZrC-SiC was changed into an obviously deflecting propagation path with closed phenomenon. The PyC coating brought about a relatively weak interface bonding and guided the crack propagate along the weak interface, consequently resulting in a more flexuous crack propagation instead of passing through the fibers directly. Meanwhile, the fibers received effective protection of coating inhibiting from performance degradation. The PyC coated C f /ZrC-SiC obtained a fracture toughness highly reaching 7.57 ± 0.33 MPa m 1/2 with a rivaling flexural strength at 268 ± 16 MPa. Moreover, the graceful load-displacement curve is illustrated with a smoothly extended displacement of 0.12 mm and increased load to 83 N, which forms an obvious yield plateau. To some degree, this work provided an effective solution to tackling the dilemma between toughness and strength of engineering ZrC-SiC ceramic.
研究领域:
材料科学
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工程学
✓ 已验证
产品关联
DOI
高影响因子
Additive Manufacturing
·
2024
·
IF 10.3
Zhang-Ao Shi,Jia-Min Wu,Zhi-Qiang Fang,Chen Mao,Li-Xiang Fu,Qi-Wen Wang,Shou-Lei Yang,Jing-Xian Zhang,Yu-Sheng Shi
The high refractive index , high absorbance, and low sintering activity of SiC powders pose challenges in achieving sufficient curing depth of SiC slurries and achieving densification of SiC ceramics. Hence, the preparation of high-strength SiC ceramics by vat photopolymerization is a challenge. This study proposes a strategy of particle surface oxidation modification and particle gradation to address this difficulty. Specifically, the surface of micron and submicron SiC particles is oxidatively modified to enhance the curing depth of SiC slurry, and the gradation of these particles is optimized to improve the sintering activity of the SiC particle system. The percentage of oxidized micron and submicron SiC particles is carefully adjusted to meet the requirements of both vat photopolymerization preparation and sintering. It found that increasing the percentage of sub-micron particles in the particle grade system had a negative impact on the rheological and curing properties of the slurry but contributed to the stability of the slurry and the performance of the sintered ceramic parts. Ensuring that the percentage of sub-micron particles reaches 50% or higher and reducing direct contact between micron particles to form sintered necks are two key conditions for the preparation of high-strength SiC ceramics. Additionally, it found that interlayer bonding location is the pore defects concentrated in the sintered ceramic parts, providing direction for further optimization of ceramic properties. By implementing the oxidation modification and particle gradation optimization strategy , the densification and three-point flexural strength of SiC ceramic parts were improved significantly. The relative density and three-point flexural strength of SiC increased from 65.7 ± 5.3% to 86.8 ± 3.7% and from 75.0 ± 2.1–170.9 ± 11.6 MPa, respectively. This approach provides a simple and effective method to prepare high-strength SiC ceramics by vat photopolymerization .
研究领域:
材料科学
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陶瓷工程
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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
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热力学
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结构力学
✓ 已验证
DOI
POWDER METALLURGY
·
2024
·
IF 1.9
Xue Feng Wang,Li Tao Chen,Yong Sun,Zhao Zhao Lv,Yu Bo Jia,Yong Chun Guo,Hua Hui Yi
In order to uniformly distribute SiCp in the aluminium matrix and prepare SiCp/Al composites with high mechanical and damping properties, a preparation method of colloidal dispersion and suction filtration was developed. It was observed from the microstructure of the composites that the SiCp/Al composites prepared by colloidal dispersion and suction filtration method had good interfacial structures, and the interfacial reaction between SiCp and aluminium matrix was effectively inhibited. Tensile mechanical properties at room temperature and damping properties in the temperature range of 25 °C to 300 °C were tested for the SiCp/Al composites with volume fractions of 5% to 10%. The results showed that SiCp/Al composites have excellent mechanical and damping properties when the volume fraction of SiCp was 7%. This is because SiCp were uniformly distributed in the aluminium matrix, and formed a good interfacial bond with the aluminium matrix, which benefitted both the interfacial slip loss and the strengthening effect of SiCp.
研究领域:
材料科学
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力学
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Wenjie Zhu,Yujie Wang,Yuwei Ren,Minghang Li,Yichun Bi,Ce Zheng,Xiaoqiang Li
High-purity Ti 3 SiC 2 MAX phase was introduced into the Amosic 3-303 SiC fiber-reinforced SiC matrix composite as a modified matrix by Reaction Melt Infiltration (RMI) at 1250 °C, realizing the generation of high-purity Ti 3 SiC 2 phase without residual melt and by-products in the RMI matrix. This modification reduced the porosity of the SiC f /SiC-Ti 3 SiC 2 composite from 10 to 20% typically found in SiC f /SiC composite prepared by Chemical Vapor Infiltration (CVI) to 6%, and the densification process cycle time by 70%. The flexural strength and thermal conductivity were enhanced by 12% and 58%, respectively. The microstructure and phase evolution of Ti 3 SiC 2 in the SiC f /SiC composite matrix was systematically investigated, offering new insights into the ceramic matrix growth process during RMI. This work proposes a new method for utilizing the RMI process to prepare high-performance nuclear SiC f /SiC-based composites.
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
SCRIPTA MATERIALIA
·
2020
·
IF 5.079
Feng Guo,Pengfei Wen,Bo Duan,Yao Li,Xilong Zhou,Pengcheng Zhai
Co 4 Sb 11.5 Te 0.5 hybrid composites with dual-nano inclusions (1 vol %) of SiC whiskers (SiC w ) and SiC particles (SiC p ) are prepared by spark plasma sintering . It is found that the hybrid composites exhibit further improved flexural strength and fracture toughness compared with those reinforced by SiC w or SiC p alone, indicating a striking synergistic enhancement effect. And the dimensionless figure of merit values of the hybrid composites remain nearly unchanged compared with the sample reinforced by individual inclusion. Our study provides an effective route to further improve the mechanical prosperities of thermoelectric materials .
研究领域:
材料科学
·
热电材料
·
复合材料
·
固态物理
·
无机非金属材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）