JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yuanjie Wang,Luke Ma,Xueliang Pei,Wanfeng Zhuo,Jing Huang,Qing Huang
The inevitable residual carbon that normally appears in the polycarbosilane-derived SiC ceramics has notorious effects on the crystallinity and thermal conductivity of SiC ceramic. In this study, nano Si was employed to fully exhaust unwanted residual carbon in a liquid polycarbosilane. Through addition of 12 wt% theoretical nano Si and pyrolysis to 1600 °C, the ceramic yield of the liquid polycarbosilane increased from 72.0 wt% to 81.8 wt% and the C/Si ratio of ceramic product decreased from 1.14 to 0.99. Raman spectroscopy and transmission electron microscope also confirmed that the residual carbon almost completely disappeared. In addition, the crystallization ability of SiC also improved, and as a result dramatical improvement in the thermal conductivity of SiC f /SiC composite was achieved. The reaction mechanism was investigated in detail to understand the residual carbon trapping effect of nano Si during the precursor-to-ceramic conversion.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Leyao Xiong,Gaoming Mo,Ke Chen,Qing Huang
Ti 3 SiC 2 is a representative MAX phase that uniquely combines the merits of metals and ceramics. However, polymer-derived Ti 3 SiC 2 has been less extensively studied, especially in terms of its reaction mechanism and structural evolution. In this study, Ti 3 SiC 2 is synthesized by pressureless pyrolysis of PCS and TiH 2 , the structural evolution and chemical reactions occurring during the organic-inorganic conversion and synthesis process are investigated. The results show that Ti 3 SiC 2 with a mass fraction of 79.2 % can be achieved by pressureless pyrolysis of PCS and TiH 2 powders, with a Ti-to-Si atomic ratio of 3:1.7, at 1350 ℃. The presence of TiH 2 enhances the ceramic yield of PCS at 1000 ℃ compared to pure PCS, as some branched and crosslinking structures form between 100 ℃ and 300 ℃. By 800 ℃, the organic-inorganic conversion of PCS and the decomposition of TiH 2 are complete, resulting in the formation of amorphous SiC, free C and porous Ti. Concurrently, some SiC may transform into amorphous Si and C in the presence of porous Ti. At 1000 ℃, T 5 Si 3 forms within the porous Ti matrix, while TiC is generated on the periphery. Between 1200℃ and 1350 ℃, a reaction between these two phases and free C leads to the synthesis of Ti 3 SiC 2 . The formed Ti 3 SiC 2 phase begins to decompose at 1450 ℃ and completely breaks down into TiC, SiC, and TiSi 2 at 1600 ℃.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Huadong Fu,Yan Qin,Zhenyue Zou,Jiamin Fan,Jipeng Dou,Kai Chang,Zhixiong Huang
Lightweight ablative materials owing to their low density, high efficiency heat insulation and excellent designability, which are considered as the most promising candidate materials in the field of aerospace ablative thermal protection. In this work, a polycarbosilane (PCS) in-situ reinforced carbon felt/phenolic (PR/C f ) aerogel composite is reported. The surface of aerogel and carbon fiber was coated with PCS protective layer by sol gel method and secondary vacuum impregnation process. The aerogel composite material possesses low density (0.264–0.307 g/cm 3 ), hydrophobic, low thermal conductivity (0.121–0.178 W/(m·K)) and significant high compressive strength (12.89 MPa). When the oxygen acetylene flame with high heat flow density ablates for 20 s, it shows high efficiency in heat protection and insulation, and the linear ablation rate is as low as 0.089 mm/s. The PL/PR/C f aerogel composite shows competitive and broad application prospects in the field of ablation heat protection in the future.
研究领域:
材料科学
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航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2024
·
IF 7.4
Fuping Li,Wei Zheng,Feng Qin,Xu Hu,Wei Dang,Zhuoli Xu,Xinyuan Zhang,Kang Zhao,Yufei Tang
Polycarbosilane-derived ceramic coatings with superior oxidation resistance enhanced by SiC whisker fillers were prepared on titanium alloys via a dip coating method. The mass gain for coatings with whiskers is −0.22 and 1.725 mg/cm 2 after oxidation at 600 °C and 700 °C for 200 h, respectively, which is lower than the values for coatings without SiC whiskers and in other works. SiC whiskers not only compensate the shrinkage of PCS like particle-shaped fillers, but also inhibit the formation of cracks. In addition, SiC whiskers increase the viscosity of the glass phase and decrease its volatilization, thus improving the oxidation resistance.
研究领域:
材料科学
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表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2025
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IF 2.8
Chufan Jing,Zhenxue Pan,Xinyue Gou,Lin Xia,Yongming Li,Caihong Xu
The poor compatibility of liquid polycarbosilane with commercial photosensitive resins limits its application in 3D printing. To meet the practical requirement, the synthesis of photosensitive polycarbosilane capable of rapid photopolymerization has emerged as a new focus of research. In this work, a polycarbosilane with 2–10 mol% acrylate group from HEA was synthesized via a dehydrogenation coupling reaction between the Si–H of vinyl-containing polycarbosilane and the –OH of 2-hydroxyethyl acrylate, yielding over 90%. The acrylate-grafted polycarbosilane shows low viscosity, high ceramic yield, and good storage stability, and its photocuring rate increases with the content of grafted-acrylate. The 10 mol% acrylate-grafted polycarbosilane named VA10 with a 1% photoinitiator can be rapidly photocured under 405 nm LED light and produce a cured green body with enough mechanical properties, suggesting its high potential for accurate 3D printing. Upon pyrolysis at 1000°C, the precursor green body printed using the digital light processing (DLP) technique produced a honeycomb ceramic component with a ceramic yield of 77.6% and a density of 0.42 g/cm 3 , which exhibited a specific compressive strength of 68.7 ± 4.9 MPa/(g·cm 3 ).
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
TENSIDE SURFACTANTS DETERGENTS
·
2022
·Vol. 59
·期 5
·424-432
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IF 1.058
Xue-Li Liu,Yi-Fan Chen,Yi-Wen Chen,Wei-Kang Peng,Han-Chun Liu
A new series of carbosilane quaternary ammonium surfactants with different hydrophobic carbosilane structures (triethylsilyl, triisopropylsilyl, trihexylsilyl, triphenylsilyl) and tail groups (C 12 , C 16 , C 18 ) have been synthesized and the structures of the organosilicon carbosilane quaternary ammonium surfactants were determined by means of FTIR, NMR and elemental analysis. The properties of aqueous solutions were determined by electrical conductivity measurements and with the method of maximum bubble formation. Members of this series reduced the surface tension of water to approximately 30.5 mN/m at concentration levels of 0.14 mmol/L.
研究领域:
化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Silicon
·
2023
·Vol. 15
·期 13
·5803-5810
·
IF 3.4
Gong Jian,Wang Yuanjie,Zhou Mingjiong,Pei Xueliang,Huang Jing,Huang Zhengren,Huang Qing
High ceramic yield, fast curing rate and high purity are essential for ceramic precursors. In this study, a SiC ceramic precursor-polycarbosilane containing both allyl group and acrylate group was synthesized. According to the 1 H-NMR analysis, the molar ratio of allyl group to acrylate group was 10:1. The polycarbosilane can be cured under UV light for only 1 s and photolithography pattern with clear boundary could be formed. After pyrolysis to 1000 °C, the ceramic yield was up to 78 wt% and the pattern could be retained without cracks and deformation. The ceramic product was composed of 63.28 wt% Si, 33.37 wt% C and 3.35 wt% O, and the chemical formula was determined as SiC 1.23 O 0.09 . As a SiC ceramic precursor, the polycarbosilane was used to prepare SiC-based protective coating on carbon fiber. The obtained SiC coating was dense with a thickness of about 150 nm, significantly improving oxidation resistance of the carbon fiber.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2012
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IF 0.978
Guo Wen Chen,Chen Zhang,Wen Jie Li,Chuan Jian Zhou,Sheng Yu Feng
A new β -cyclodextrin modified hyperbranched carbosilane stationary phase for gas chromatography was synthesized by substituting the OH groups of β -cyclodextrin with hyperbranched carbosilane and was coated on the inner wall of fused silica capillary column for gas chromatography. The chromatographic behaviors of the stationary phase were studied. The initial testing results showed that it possessed good separation abilities for several kinds of mixtures, such as benzenes, acrylates , ketones and alkylchlorides.
研究领域:
分析化学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2025
·
IF 3.8
Jianan Shan,Gaoming Mo,Haijun Chen,Zhiyun Huangfu,Jing Huang,Qin Ouyang,Qing Huang
SiC fiber is a critical structural material for high-temperature extreme environments and nuclear energy applications. Traditional methods for producing industrial SiC fibers include oxidation and electron irradiation. In this study, a photo-sensitive nitrogenous polyvinylaluminocarbosilane (PVACNS) is synthesized by uniformly blending polyaluminocarbosilane (PACS) and triallyl isocyanurate (TAIC). This precursor can be melt-spun into fibers and rapidly UV-cured at room temperature. After thermal pyrolysis at 1200°C and sintering at 1800°C of the cured fiber, amorphous SiAlCNO fibers with an oxygen content of 9.25 wt%, nitrogen content of 4.42 wt%, and a C/Si ratio of 1.60, and crystalline SiAlC fibers with an oxygen content of 0.02 wt%, nitrogen content of 0.11 wt%, and a C/Si ratio of 1.18 are obtained. The main UV curing mechanism involves homopolymerization of C = C bonds, in addition to minor hydrosilylation reaction between Si–H and C = C bonds. Between 400°C and 600°C, oxygen, nitrogen, and carbon contents decrease significantly due to the decomposition of TAIC. At 1200°C, the amorphous SiAlCNO fiber consists of amorphous SiC x O y , SiC x N y phases, and free carbon, with formation of Al–C and Al–N bonds. β-SiC begins to form at 1400°C. At higher temperatures above 1400°C, SiC x O y and SiC x N y phases decompose, leading to notable decrease in oxygen and nitrogen content at 1600°C and 1800°C. However, due to the presence of Al–C and Al–N bonds, the formation of voids and defects is inhibited and the coarsening of β-SiC is suppressed, resulting in a relatively dense structure in the SiAlC fibers at 1600°C and 1800°C.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Dou Chen,Gaoming Mo,Junmin Qian,Liu He,Qing Huang,Zhengren Huang
Polycarbonsilane (PCS) is an important precursor of silicon carbide (SiC) fibers and ceramics. The ceramic yield of PCS is relatively low, about 60 %, which may bring some deficiencies in its applications. In this work, a novel precursor cyano-polycarbosilane (PCSCN) is synthesized by hydrosilylation reaction between PCS and acrylonitrile using a rhodium-containing catalyst, although acrylonitrile is generally not easy for hydrosilylation. After introducing tiny amounts of cyano (-C≡N) groups into the PCS molecules, the ceramic yield of PCSCN can increase largely to over 80 %. The ceramization mechanism of PCSCN is investigated by FTIR, TG, XPS , ESR , NMR, Raman and XRD analyses. It is found that some crosslinking structures in PCSCN are formed between Si H bonds and C N groups from about 200 ℃, which can be responsible for the high ceramic yield. The existence of a little more N, O and free C elements in the pyrolysis products may inhibit the growth of crystalline β-SiC. Moreover, the PCSCN precursor can also be melt-spun into continuous fibers by tailoring its molecular weight and softening point. The oxidized PCSCN fiber with relatively low oxygen content can be pyrolyzed without melting, and the final SiC fiber with an oxygen content as low as 8.5 % is obtained.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2022
·
IF 2.719
Weiqiu Huang,Bing Zhu,Jiahui Zhu,Xufei Li,Xinya Wang,Baoyou Yan,Fei Yi,Zhen Zhang
Novel AC (termed as A-AC/SiC) with high thermal conductivity was prepared by using emulsified asphalt as precursor and polycarbosilane (PCS) as thermal conductive addition by in-situ reaction. The specific surface area and total pore volume of sample A-AC/SiC-20 was up to 1346 m 2 ·g −1 and 0.89 cm 3 ·g −1 respectively. The SEM and FIIR showed that PCS had been successfully loaded into the A-AC and formed the uniform cross-linking structure, while its thermal conductivity increased by nearly 300 % than that of the parent A-AC. Moreover, it also exhibited high adsorption capacity up to 3.46 mmol·g −1 and excellent recyclability for n-hexane vapor.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2018
·Vol. 15
·期 6
·1510-1517
·
IF 1.165
Lulu Zhou,Yong Cheng,Wenfa Zhang,Wenli Zhang,Weihua Liu,Yunbo Li,Mouhua Wang
An interesting method for radiation cross-linking polycarbosilane (PCS) at high efficiency and low cost was developed by adding multifunctional monomers (trimethylolpropane trimethacrylate (TMPTMA) or divinylbenzene (DVB)). The effect of multifunctional monomers on the radiation cross-linking and ceramic yield of PCS was investigated. The results revealed that the addition of a small amount of multifunctional monomer can substantially improve the ceramic yield and reduce the absorbed dose by promoting cross-linking. The ceramic yields of radiation cross-linked “PCS/2%DVB (300 kGy)” and “PCS/2%TMPTMA (300 kGy)” were 74 wt% and 78 wt%, respectively, while that of the radiation cross-linked “PCS (300 kGy)” was only 64 wt%. The presence of double bonds in multifunctional monomers stimulated the combination reactions of free radicals in PCS induced by γ-ray irradiation and subsequently enhanced the efficiency of cross-linking. Furthermore, it was found that the incorporation of a small amount of multifunctional monomer hardly affected the chemical composition and crystallization behavior of the final SiC ceramics.
研究领域:
材料科学
·
辐射化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）