Materials Today Communications
·
2024
·
IF 3.7
Q. Li,J. Shang
Al 2 O 3 /MoS 2 /CePO 4 composite ceramic layer was in-situ prepared on aluminum alloy by micro-arc oxidation. The results show that the content of (CH 3 CO 3 ) 3 Ce·xH 2 O has a great influence on the microstructure of the ceramic layer. When the addition amount is 7.5 g/L, the surface hardness of the ceramic layer is 961.97 HV 1 , which is 1.8 times that of the unadded and 8.36 times that of the matrix. Tribological tests show that the moderate addition of (CH 3 CO 3 ) 3 Ce·xH 2 O also significantly improves the wear resistance of the ceramic layer. Composite layer research can be developed and applied to other alloys to improve their friction properties.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2020
·
IF 3.784
Yongchao Fang,Xiufang Cui,Guo Jin,Erbao Liu,Dan Zhang,Xin Wen,Qingbo Mi
In this work, hot corrosion behavior of air plasma sprayed La 0.8 Ba 0.2 TiO 3-δ (LBT)-YSZ double-ceramic-layer thermal barrier coating exposed to Na 2 SO 4 + V 2 O 5 molten salt at 900 °C for 20 h was investigated. The phase characterization and microstructural evolution analysis of the coating was carried out after the hot corrosion test by using X-ray diffraction (XRD), scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). The results showed that the LBT-YSZ coating possessed excellent hot corrosion resistance compared with the conventional pure YSZ coating. The conventional pure YSZ coating was completely destroyed after the 10 h test due to the volume change resulting from the adverse phase transition. However, the situation for the LBT-YSZ coatings is completely opposite. The LBT-YSZ coating could prevent the YSZ interlayer underlying the LBT overlayer from densification for at least 20 h. In the LBT overlayer, the double-reaction-layer composed of under dense layer and upper porous layer was formed. In particular, the continuous dense layers with a thickness of ~100 μm formed after 10 h, effectively arresting further penetration of the molten salt. In addition, affected by the diffusion extent of SO 3 gas, the corrosion products of porous layer were composed of Ba 2 V 2 O 7 , LaVO 4 , TiO 2 and BaSO 4 , while those of dense layer consisted of Ba 2 V 2 O 7 , LaVO 4 and TiO 2 . The specific mechanism by which the corrosion reaction occurred was proposed based on Lewis acid-base rule and thermodynamics.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 44
·49376
·
IF 2.52
Zhaoqi Niu,Dan Tian,Long Yan,Xiaoyan Ma,Chengshuang Zhang,Xiao Hou
3,13-Diglycidyloxypropyloctaphenyl double-decker silsesquioxane (EP-DDSQ) was synthesized by process of alkaline hydrolysis condensation of phenyltrimethoxysilane and corner capping reaction of methyldichlorosilane, followed by hydrosilylation with allyl glycidyl ether, and the resultant structure was confirmed by fourier transform infrared spectrometer (FTIR) and nuclear magnetic resonance (NMR), respectively. The thermosetting phenol-formaldehyde (PF) resin was then modified by EP-DDSQ, and the reactivity of PF resin with EP-DDSQ and thermal pyrolysis of modified cured resin were investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The surface morphologies of modified resins at high temperature were characterized with field emission scanning electron microscope (FESEM), and chemical structure of modified resins was analyzed through X-ray photoelectron spectrometer (XPS). The results showed that the appropriate addition of EP-DDSQ did not affect the curing temperature of the PF resin itself, but could improve the heat resistance of the system. When the amount of EP-DDSQ added was 10%, the initial degradation temperature of PF resin was increased by 49.31°C, and when the amount of EP-DDSQ added was 16%, the char yield of which was reached up to 61.39%, compared with that of pure PF resin (TGA 1,000°C of 57.62%) at Ar atmosphere. More importantly, the modified resin formed a regular and dense layer of SiC and SiO x ceramic on the surface after ablation in the muffle furnace at 800°C air atmosphere, which is very important for ablative resistant materials.
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
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2022
·Vol. 307
·期 11
·2200355
·
IF 4.402
Yang Chen,Zhuodong Liu,Yisen Huang,Mei Liang,Huawei Zou
The strength of the ceramic layer formed during ablation of the silicone rubber composite is closely related to its resistance to ablation. Increasing the content of graphitic carbon in the ceramic layer plays a key role in enhancing the strength of ceramic layer. In this study, series of catalytically graphitized mesophase pitch-modified silicone rubber composites with excellent ablation performance are prepared. And the average linear ablation rate of the composite is reduced to a maximum of 0.046 mm s -1 , which is 44.0% lower than that of the sample without catalyst named 5MP. XRD characterization proves that the addition of transition metal catalysts increases the content of graphitic carbon in the ceramic layers after ablation. The strength of ceramic layer of the 0.13Fe 2 O 3 reached 12.09 MPa, which is 60.3% higher than that of the 5MP. The transition metal catalyst effectively increases the content of graphitic carbon in the ceramic layers, and the strengths of the ceramic layers are significantly improved, thereby greatly improving the ablation performance of the composites.
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
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Jianxiang Xiong,Yiming Liao,Xuejun Lai,Hongqiang Li,Xingrong Zeng
The preparation of silicone rubber with excellent tracking resistance and flame retardancy is of great significance for application in high-voltage electrical insulation. Unfortunately, to date there lacks an effective strategy to simultaneously endow silicone rubber with satisfied tracking resistance and flame retardancy. In this work, aminopropyltriethoxysilane-modified MXene (APTES-MXene) was prepared by dehydrative condensation between the Si-OH in the hydrolyzed aminopropyltriethoxysilane (APTES) and the hydroxyl groups in MXene. The APTES-MXene was homogeneously dispersed in addition-cure liquid silicone rubber (ALSR). The effects of APTES-MXene on the tracking resistance and flame retardancy of ALSR were investigated. Incorporating 0.175 phr APTES-MXene and 15 ppm Pt catalyst enabled ALSR to pass 1A4.5 level, with a low erosion rate of only 0.29 %, indicating a significantly improved tracking resistance. Meanwhile, the 0.175 phr APTES-MXene also endowed ALSR a UL-94 V-0 rating and the limiting oxygen index (LOI) value reached 32.8 %. It was found that APTES-MXene and Pt catalyst synergistically promoted ALSR forming ceramic layer at elevated temperature. The mechanism for APTES-MXene improving the tracking resistance of ALSR was also proposed. This work provided new insights for high performance high-voltage insulation silicone rubber.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
Interdisciplinary Materials
·
2022
·Vol. 1
·期 3
·434-444
·
IF 0
Guoxu Wang,Yuhao Liang,Hong Liu,Chao Wang,Dabing Li,Li-Zhen Fan
All-solid-state Li metal batteries (ASSLMBs) have been considered the most promising candidates for next-generation energy storage devices owing to their high-energy density and safety. However, some obstacles such as thick solid electrolyte (SSEs) and unstable interface between the solid-state electrolytes (SSEs) and the electrodes have restricted the practical application of ASSLBs. Here, the scalable polyimide (PI) film reinforced asymmetric ultra-thin (~20 μm) composite solid electrolyte (AU-CSE) with a ceramic-rich layer and polymer-rich layer is fabricated by a both-side casting method and rolling process. The ceramic-rich layer not only acts as a “securer” to inhibit the lithium dendrite growth but also redistributes Li-ions uniform deposition, while the polymer-rich layer improves the compatibility with cathode materials. As a result, the obtained AU-CSE demonstrates an ionic conductivity of 1.44 × 10 −4 S cm −1 at 35°C. The PI-reinforced AU-CSE enables Li/Li symmetric cell stable cycling over 1200 h at 0.2 mA cm −2 and 0.2 mAh cm −2 . Li/LiNi 0.6 Co 0.2 Mn 0.2 O 2 and Li/LiFePO 4 ASSLMBs achieve superior performances at 35°C. This study provides a new way of solving the interface problems between SSEs and electrodes and developing high-energy-density ASSLMBs for practical applications.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
MATERIALS & DESIGN
·
2020
·
IF 6.289
Feng Xu,Shizhen Zhu,Zhuang Ma,Yanbo Liu,Hezhang Li,Jingdan Hu
The using performance of carbon fabric reinforced phenolic composites in the aerospace industry is determined by the fibre/matrix interfaces performance and ablation resistance. To enhance these properties, a functionalized ZrSiO 4 sol was prepared and sprayed onto carbon fabric, and then the coated fabric was impregnated with resin to fabricate the composite. The ablation resistance and interlaminar shear strength of the composite were investigated. Results showed that the functionalized ZrSiO 4 sol had positive effect on composite modification. Due to the improved interfacial adhesion between the carbon fabric and resin, the shear strength of the functionalized ZrSiO 4 sol modified composite increased by 11% compared to the unmodified composite. Furthermore, the mass ablation ratio of the functionalized ZrSiO 4 sol modified composite was 30% lower than that of the unmodified composite. The surface ceramic layer with a main phase composition of ZrO 2 provided an oxygen insulating effect and protected the inner material from serious oxidative ablation. These results confirm that the interlaminar shear strength and ablation resistance of the composite were both significantly enhanced, making this composite be suitable for more severe ablation environments.
研究领域:
航空航天工程
·
材料科学
·
复合材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）