International Journal of Applied Ceramic Technology
·
2023
·Vol. 20
·期 3
·1740-1752
·
IF 2.1
Ling Pan,Pengju Chen,Peng Xiao,Ling He,Wei Zhou,Yang Li
The mullite and ytterbium disilicate (β-Yb 2 Si 2 O 7 ) powders as starting materials for the Yb 2 Si 2 O 7 /mullite/SiC tri-layer coating are synthesized by a sol–gel method. The effect of SiC whiskers on the anti-oxidation properties of Yb 2 Si 2 O 7 /mullite/SiC tri-layer coating for C/SiC composites in the air environment is deeply studied. Results show that the formation temperature and complete transition temperature of mullite were 800–1000 and 1300°C, respectively. Yb 2 SiO 5 , α-Yb 2 Si 2 O 7 , and β-Yb 2 Si 2 O 7 were gradually formed between 800 and 1000°C, and Yb 2 SiO 5 and α-Yb 2 Si 2 O 7 were completely transformed into β-Yb 2 Si 2 O 7 at a temperature above 1200°C. The weight loss of Yb 2 Si 2 O 7 /(SiC w –mullite)/SiC tri-layer coating coated specimens was 0.15 × 10 −3 g cm −2 after 200 h oxidation at 1400°C, which is lower than that of Yb 2 Si 2 O 7 /mullite/SiC tri-layer coating (2.84 × 10 −3 g cm −2 ). The SiC whiskers in mullite middle coating can not only alleviate the coefficient of thermal expansion difference between mullite middle coating and β-Yb 2 Si 2 O 7 outer coating, but also improve the self-healing performance of the mullite middle coating owing to the self-healing aluminosilicate glass phase formed by the reaction between SiO 2 (oxidation of SiC whiskers) and mullite particles.
研究领域:
材料科学
·
陶瓷学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2018
·Vol. 11
·期 3
·350
·
IF 2.467
Guangyuan Yang,Zhixiong Huang,Xu Wang,Bo Wang
The paper proposed a method to improve the anti-oxidation performance of carbon fibers (CF) at high temperature environment by coating silicon dioxide (SiO2) and silicon carbide (SiC). The modified sol-gel method had been used to ensure the proper interface between fibers and coating. We used polydimethylsiloxane and ethyl orthosilicate to make stable emulsion to uniformly disperse SiC nanoparticles. The modified SiO2/SiC coating had been coated on CF successfully. Compared with the untreated CF, the coated fibers started to be oxidized around 900 °C and the residual weight was 57% at 1400 °C. The oxidation mechanism had been discussed. The structure of SiC/SiO2coated CF had been characterized by scanning electron microscope and X-ray diffraction analysis. Thermal gravimetric analysis was used to test the anti-oxidation ability of CF with different coatings.Keywords:carbon fiber;oxidation resistance;coating;characterization
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2019
·Vol. 11
·期 6
·970
·
IF 3.164
Wen Zhang,Zhi-Yi Yang,Xian-Wei Cheng,Ren-Cheng Tang,Yi-Fan Qiao
Natural bioactive compounds have received increasing attention in the functional modification of textiles. In this work, tannic acid was used to impart antibacterial and antioxidant functions to silk using an adsorption technique, and the adsorption properties of tannic acid on silk were studied. The adsorption quantity of tannic acid on silk increased with decreasing pH in the range of 3–7. The rates of the uptake of tannic acid by silk were well correlated to the pseudo-second-order kinetic model, and the calculated activation energy of adsorption was 93.49 kJ/mol. The equilibrium adsorption isotherms followed the Langmuir model. The adsorption rate and isotherm studies demonstrated that the chemical adsorption of tannic acid on silk occurred through the ion-ion interaction between tannic acid and silk. Tannic acid displayed good building-up properties on silk. The silk fabric treated with 0.5% tannic acid (relative to fabric weight) exhibited excellent and durable antibacterial properties. Moreover, the silk fabrics treated with 2% and 5% tannic acid had good and durable antioxidant properties. The treatment by tannic acid had less impact on the whiteness of the silk fabric. In summary, tannic acid can be used as a functional agent for preparing healthy and hygienic silk materials.
研究领域:
纺织科学
·
生物化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhangyi Huang,Zhengwei Zhu,Mingyu Su,Yang Shi,Mao Deng,Ruichong Chen,Zhijun Wang,Zhi Zhou,Jianqi Qi,Haomin Wang
This study investigated the high-temperature oxidation behaviors of TMC ceramics. The results indicate that the high-temperature oxidation curves of the four TMC ceramics follow a parabolic law, suggesting a diffusion-controlled process. The activation energies for the oxidation of TaC, NbC, TiC, and ZrC ceramics are 105.4, 124.3, 169.3, and 78.7 kJ/mol, respectively, with oxidation rate constants at 1000 °C of 16.84, 40.45, 0.18, and 14.43 mg 2 /cm 4 ·h for each ceramic, respectively. The temperatures at which the ceramics disintegrate into fragments in high-temperature air are 800, 800, >1000, and 600 °C, respectively. The anti-oxidation performance of the four TMC ceramics ranks as follows: TiC > TaC > NbC > ZrC. In comparison to the reported high-entropy carbide ceramics, the TiC ceramic in this study demonstrates superior anti-oxidation performance due to dense TiO 2 layer formation, characterized by significantly low oxidation rates and excellent structural stability.
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
E-POLYMERS
·
2021
·Vol. 21
·期 1
·316-326
·
IF 2.025
Bing Wang,Minxian Shi,Jie Ding,Zhixiong Huang
In this work, octamercapto polyhedral oligomeric silsesquioxane (POSS-8SH) and octaphenol polyhedral oligomeric silsesquioxane (POSS-8Phenol) were successfully synthetized. POSS-8Phenol was added into the synthesis process of liquid thermoset phenolic resin (PR) to obtain POSS-modified phenolic resin (POSS-PR). Chemical structures of POSS-8SH, POSS-8Phenol, and POSS-PR were confirmed by FTIR and 1 H-NMR. TG and DTG analysis under different atmosphere showed that char yield of POSS-PR at 1,000°C increased from 58.6% to 65.2% in N 2 , which in air increased from 2.3% to 26.9% at 700°C. The maximum pyrolysis temperature in air increased from 543°C to 680°C, which meant better anti-oxidation properties. XRD results confirmed both POSS-8Phenol and POSS-PR-generated crystalline SiO 2 in air, which could explain the improvement of anti-oxidation properties. SEM showed that the POSS-PR had phase separation during curing process. Finally, carbon fiber fabric-reinforced POSS-PR (C-POSS-PR) was prepared to verify the anti-oxidation properties of POSS-PR.
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 THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Xiao-Hui Yang,Guo-Hua Zhang
Oxidation behaviors of Al 2 O 3 reinforced MoAlB ceramics prepared by spark plasma sintering were investigated at 800–1200 °C. The results revealed that appropriate addition of Al 2 O 3 facilitated the improvement of oxidation resistance and mechanical properties of MoAlB ceramics. Among them, the composite ceramics with 5 vol% Al 2 O 3 addition possessed reinforced antioxidant properties with the oxide layer thickness being only 1.81 µm for 800 °C and 2.08 µm for 1000 °C after oxidation for 64 h, respectively. MoAlB ceramics added with 10 vol% Al 2 O 3 demonstrated the optimal mechanical properties. However, excessive addition of Al 2 O 3 adversely affected both the antioxidant and mechanical 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
POLYMER DEGRADATION AND STABILITY
·
2021
·
IF 5.03
Shanshan Huangfu,Guangzhi Jin,Qingwei Sun,Liwei Li,Peng Yu,Runguo Wang,Liqun Zhang
Natural rubber (NR) is acknowledged to be a strategically important material, which spans multiple applications from tires to shock absorbers, generally, the antioxidant is indispensable for NR to prolong the service life and improve the long-term reliability. Recent reports demonstrated that the purified carbon dots with the capability of scavenging oxy radicals can be effective antioxidants for rubbers. However, the application of purified CDs is greatly restricted by the multiple tedious, complicated, time-consuming, and expensive post-purification processes. Herein, we first synthesize the amine-passivated crude carbon dots (CCDs) by a facile microwave-assisted pyrolysis method, and we attempt to directly use the CCDs (without any purifications) as a novel and inexpensive antioxidant for NR. To achieve a fine CCDs dispersion within NR matrix, we disperse the CCDs into the NR matrix by the liquid feeding and in-situ compatibilizing. The CCDs fluid was firstly prepared by mixing the CCDs with water, then the CCDs fluid together with the compatibilizer was melt-compounded with NR. The results showed that the well-dispersed CCDs endowed NR with the impressive antioxidative property. Overall, this work extends application scope of CCDs and provides unique inspiration to develop novel and effective antioxidants for elastomers.
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
Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Rufei Zhang,Hui Teng,Jinyuan Miao,Jianing Kang,Lili Zhou,Linting Cheng,Zhiqun Bai,Jianwen Zhang,Jia Liu,Yang Tang,Pingyu Wan
For renewable energy-driven water electrolysis, developing low cost, highly active and durable electrocatalysts is essential. Here, we prepared a W-doped NiMoN microcolumn coated with a nitrogen doped carbon layer (W-NiMoN@NC) as an excellent non-precious electrocatalyst. This material displays excellent hydrogen evolution reaction (HER) activity with low overpotentials of 13 and 67 mV at 10 and 100 mA cm−2, outperforming commercial Pt/C. DFT calculations show that W doping optimizes the water dissociation and H* adsorption processes, improving HER activity. Additionally, W doping coupled with an ultrathin NC coating enhances the intrinsic anti-oxidation ability of NiMoN. After 100 cycles of harsh fluctuating electrolysis, the incremental overpotential of W-NiMoN@NC is only 8 mV at 1000 mA cm−2, significantly less than that of undoped NiMoN@NC (56 mV). The excellent anti-oxidation ability of W-NiMoN@NC resulting from its high reserves of Ni0 was proved by XPS analysis after fluctuating electrolysis. This inside-out strategy endows W-NiMoN@NC with an exceptional feature of long-term durability under harsh fluctuating conditions and a promising potential for application in renewable energy-powered electrolysis.
研究领域:
材料科学
·
可再生能源
·
电催化
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Pengfei Wu,Yu Liu,Shenwei Xu,Zeyu Fu,Aimin Pang,Wei Li,Haitang Yang
The effects of the SiC nanowires (SiCNWs) and PyC interface layers on the mechanical and anti-oxidation properties of SiC fiber (SiC f )/SiC composites were investigated. To achieve this, the PyC layer was coated on the SiC f using a chemical vapour infiltration (CVI) method. Then, SiCNWs were successfully coated on the surface of SiC f /PyC using the electrophoretic deposition method . Finally, a thin PyC layer was coated on the surface of SiC f /PyC/SiCNWs. Three mini-composites, SiC f /PyC/SiC, SiC f /PyC/SiCNWs/SiC, and SiC f /PyC/SiCNWs/PyC/SiC, were fabricated using the typical precursor infiltration and pyrolysis method. The morphologies of the samples were examined using scanning electron microscopy and energy dispersive X-ray spectrometry. Tensile and single-fibre push-out tests were carried out to investigate the mechanical performance and interfacial shear strength of the composites before and after oxidization at 1200 °C. The results revealed that the SiC f /PyC/SiCNWs/SiC composites showed the best mechanical and anti-oxidation performance among all the composites investigated. The strengthening and toughening is mainly achieved by SiCNWs optimization of the interfacial bonding strength of the composite and its own nano-toughening. On the basis of the results, the effects of SiCNWs on the oxidation process and retardation mechanism of the SiC f /SiC mini-composites were investigated.
研究领域:
材料科学
·
力学
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2021
·
IF 3.383
Aiyang Wang,Qianglong He,Wenchao Guo,Chun Liu,Tian Tian,Lanxin Hu,Lisheng Liu,Weimin Wang,Zhengyi Fu
B 4 C ceramics were strengthened by introducing the hard second–phase particles TiB 2 and SiC, and the effects of TiB 2 and SiC contents on the microstructure and properties of the composites were investigated. B 4 C–TiB 2 binary composites with TiB 2 contents of 10, 20, 30, and 40 vol% were prepared by hot pressing. The microstructure, mechanical properties, and electrical properties of the composites with different TiB 2 contents were investigated and compared. The results showed that the B 4 C–30 vol%TiB 2 composite obtained the best comprehensive properties, with a relative density, hardness, bending strength , fracture toughness , and conductivity of 97.9 %, 29.5 GPa, 590 MPa, 6.41 MPa m 1/2 , and 7.6 × 10 4 S/m. The compressive stress generated on B 4 C, crack deflection induced by TiB 2 , and conductive network formed by TiB 2 are of great significance in the context of the properties of the B 4 C–TiB 2 composites. In addition, B 4 C–TiB 2 –SiC ternary composites with SiC contents of 0, 10, and 20 vol% were also fabricated by hot pressing. The effect of SiC content on the microstructure and mechanical properties, and the effect of SiC on the antioxidant properties of the composites were investigated. The results showed that the B 4 C–30 vol%TiB 2 –10 vol%SiC composite had the best comprehensive properties, with a relative density, hardness, flexural strength, fracture toughness, and residual flexural strength (1600 ℃) of 98.8 %, 29.5 GPa, 621 MPa, 6.80 MPa m 1/2 , and 465 MPa. The inhibition of the growth of SiC to other grains, removal of oxide impurities, and repair of damage by SiC oxidation products play an important role in the performance of the B 4 C–TiB 2 –SiC composites.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
Journal of Bioresources and Bioproducts
·
2024
·
IF 20.2
Yuanlong Guo,Pengcheng Liu,Lei Deng,Changwei Lui,Michael North,Gang Hu,Qitian Huang,Zongbao Kent Zhao,Haibo Xie
Phenolation is one of the effective strategies to synthesize lignin-based polyphenols, improve lignin's properties, and extend its value-added applications in biological, medicinal and cosmetic fields. Herein, by taking the structural feature advantage of lignin, an effective and green strategy was developed to molecularly engineer lignin into a robust lignin-3-(2-hydroxyphenyl)propionate ester (LPPE) derivative via a transesterification reaction between 3,4-dihydrocoumarin (DHC) and the aliphatic hydroxyls in lignin under organocatalysis. The strategy is optimized and the novel derivative was systematically characterized by 1 H, 13 C and 31 P nuclear magnetic resonance (NMR) and Fourier transform infrared (FT-IR) spectroscopy. The findings indicated that the successful introduction of 3-(2-hydroxyphenyl)propionate groups using a OH groups/DHC/organic base molar ratio of 1꞉1꞉0.3 at 120 °C for 6 h increased the content of phenolic hydroxyl groups from 1.793 1 to 3.017 9 mmol/g, and the LPPE exhibited excellent ultraviolet-absorbing and antioxidant performance with up to 90% free radical scavenging activity within 20 min using 5 mg/mL of LPPE. In addition, good biocompatibility and a high Sun protection factor (SPF) value of 40.9 were achieved at 5% ( w ) dosage of LPPE in the cream, indicating its significant application potential in sunscreen.
研究领域:
生物化学
·
化妆品科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Chengmou Deng,Huiyong Yang,Juntong Huang,Ruiying Luo,Lianyi Wang,Zhi Chen,Wei Li,Jintao Qiu,Wenpeng Li
SiC fiber bundles with 1–4 HfSiO 4 sub-layers as the interface coating were successfully obtained with detailed optimized preparation parameters via the non-hydrolyzed sol-gel ( NHSG) and dip-coating method. Subsequently, SiC f /SiC minicomposites reinforced with HfSiO 4 -coated fibers were fabricated through a precursor infiltration pyrolysis ( PIP ) process. The tensile behavior and microstructures of the prepared SiC f /SiC minicomposites treated at room temperature, 800 ℃, and 1000 ℃ in an air atmosphere were investigated. The toughening mechanism of the HfSiO 4 interphase in the SiC f /SiC minicomposites and the corresponding anti-oxidant properties were also thoroughly discussed. Results indicate that SiC f /SiC minicomposites with the HfSiO 4 interphase possessed a nearly pseudo-plastic fracture characteristic and significantly enhanced anti-oxidant properties. It is inspired that the properties of the SiC f /SiC minicomposites could be adjusted by controlling the thickness of the HfSiO 4 interphase to acquire desirable properties such as a higher tensile strength or better oxidation resistance.
研究领域:
材料科学
·
复合材料工程
✓ 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）