CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Bolin Yang,Changliu Kuang,Zhenglong Liu,Chao Yu,Chengji Deng,Jun Ding,Zhoufu Wang,Shixian Zhao
In order to effectively improve the density and oxidation resistance of ZrB 2 -SiC coating materials, HfB 2 was added into ZrB 2 -SiC system and their physical properties, oxidation resistance were explored. It was observed that the flexural strength of the spark plasma sintered sample with 8 vol% HfB 2 was 717.1 MPa, which was 162.6 % higher than that of the sample without HfB 2 (273.1 MPa). At the same time, the oxidation activation energy of the sample with 15 vol% HfB 2 was increased to 511.98 kJ/mol, showing excellent oxidation resistance. The oxidation process is that HfB 2 and ZrB 2 were oxidized prior to SiC to form HfO 2 and ZrO 2 to form a dense oxide layer on the outermost layer of the sample, and SiC reacted to form a second dense SiO 2 layer to hinder oxygen intrusion. In summary, diboride can achieve the synergistic effect of improving the oxidation resistance and structural optimization of ZrB 2 -SiC-HfB 2 coatings composites, which provides a theoretical basis for its practical application.
研究领域:
材料科学
·
高温材料
·
涂层技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Binbin Wu,Na Ni,Xiaohui Fan,Xiaofeng Zhao,Ping Xiao,Fangwei Guo
ZrB 2 -SiC coatings with varied porous structures were deposited on SiC fiber tows using the sol-gel method and cured at 1400 ℃ in vacuum. Tensile strength of the coated SiC fibers were much lower than that of the uncoated fibers. The bimodal distribution in the Weibull plot of the coated SiC fibers demonstrated that the fracture of the coated fiber can be attributed to two types of defects: the porous structure of the coating and the fiber defects. Detailed morphology and microstructure characterization of the coating and fiber combined with strength calculation were carried out to investigate the individual contribution of the fiber defects and the porous coating layer respectively. The results revealed that apart from the fiber damage during the coating process the porous structure of the fiber coating has a non-negligible effect on the fiber strength, presumably due to a relatively strong bonding between the fiber and coating.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Gui Li,Jianjie Hao,Jiayan Li,Pengyu Dai,Bo Wang,Yuanqi Li,Yi Tan,Xueqiang Cao
This work firstly evaluated the effect of temperature on the preparation of SiC coating using Al 2 O 3 as catalyst by pack cementation (PC) method. SiC/ZrB 2 -SiC-Si (ZSS) and SiC/ZrB 2 -SiC-Al 2 O 3 (ZSA) coating were prepared on the surface of C/C composites by PC combined with atmospheric plasma spraying (APS). The objective of this work is to study the influence of Si and Al 2 O 3 additives for ablation performances of ZrB 2 -SiC coating. The coated samples were subjected to ablation test, and the phase composition and microstructure evolution were investigated. The results indicated that SiC/ZSA coating had better ablation resistance because phase transformation and growth of ZrO 2 grain was restrained by Al 2 O 3 .
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
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
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jie Tang,Meng Liu,Yuquan Wei,Yong Yang,Zhengren Huang
Liquid silicon infiltration (LSI) is a fast and low-cost method for the manufacturing of C f /SiC composites. However, due to the high reactivity of LSI process, the carbon fiber is easily to be eroded by liquid silicon. A recognized solution is to coat the fiber surface with a protective layer. Here, we report a preparation method of C f @SiC short fiber for carbon fiber protection in LSI process. First, C f @HTC short fiber with controllable thickness (1–10 μm) and uniform Hydrothermal carbon (HTC) coating was prepared by hydrothermal method . After the first LSI, silicon carbide layers which was derived from the reaction of HTC and liquid silicon had been successfully constructed on the carbon fibers with the thickness rang form 1–3 μm. This strategy demonstrates a tantalizing possibility and promising prospect to the preparation of light and high strength C f /SiC ceramic matrix composites with good fiber protection.
研究领域:
材料科学
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2014
·
IF 2.016
Xiujie He,Jinliang Song,Jie Tan,Baoliang Zhang,Huihao Xia,Zhoutong He,Xingtai Zhou,Mingwen Zhao,Xiangdong Liu,Li Xu,Shuo Bai
SiC coating is produced on a nuclear graphite (NG) substrate using chemical vapor deposition at 1150 °C to protect it from molten salt diffusion . Infiltration studies, performed in molten FLiNaK salt under an argon atmosphere at 5 atm, show that uncoated NG exhibits significantly higher weight gain than SiC-coated NG. The continuous and compact SiC coating exhibits excellent infiltration resistance in liquid fluoride salt as confirmed by synchrotron radiation X-ray microbeam fluorescence.
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
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Aolin Xie,Bei Zhang,Yicheng Ge,Ke Peng,Ping Xu,Xiaodong Wang,Zhirong Feng,Maozhong Yi,Zhe Zhou
To maintain the thermal stability of SiC nanowires during SiC coating fabrication process, carbon and SiC double protective layers were covered on the surface of nanowires. And SiC nanowires with double protective layers toughened SiC coating were prepared by pack cementation. The results showed that after introducing the SiC nanowires with double protective layers, the fracture toughness of the SiC coating was increased by 88.4 %. The coating protected C/C for 175 h with a mass loss of 3.67 %, and after 51 thermal shock cycles, the mass losses of the oxidized coating were 3.96 %. The double protective layers are beneficial to improve the thermal stability of nanowires, leading to good fracture toughness and thermal shock resistance of SiC coating. SiC nanowires consume the energy of crack propagation by fracture, pullout and bridging, leading to an increase in fracture toughness.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Jianjie Hao,Jiayan Li,Binglin Zou,Xiaolong Cai,Wei Shi,Yi Tan
ZrB 2 -SiC-Al 2 O 3 (ZSA) and ZrB 2 -SiC-Si (ZSS) coatings were prepared on the surface of C/C composites by atmospheric plasma spraying . During oxidation at 1200 ℃ for 10 h, the formation of B 2 O 3 in the ZSA coating volatilizes gradually, no glass phase is able to seal cracks and holes, resulting in poor oxidation resistance . On the other hand, the ZSS coating produces a large amount of borosilicate glass phase and still gains 0.8% weight after 10 h. During oxidation at 1500 ℃, a low viscosity SiO 2 glass phase forms on the ZSA coating, due to the presence of Al 2 O 3 and this glassy phase has a good ability to seal defects. However, the rapid volatilization of B 2 O 3 in the ZSS coating leads to the formation of large holes in the coating, and to progressively increased viscosity of SiO 2 glass phase, resulting in decreased oxidation resistance.
研究领域:
材料科学
·
涂层技术
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2024
·
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
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2023
·Vol. 25
·期 19
·2300391
·
IF 3.6
Yuting Duan,Jincui Ren,Chaofeng Lv,Xinyi Li,Yisheng Wu
ZrB 2 –SiC coatings are prepared on the surface of graphite by slurry brushing method to improve the oxidation resistance. Effects of ZrB 2 content and polyvinyl butyral (PVB)–ethanol solution concentration on microstructure and static oxidation behavior of the ZrB 2 –SiC coatings are investigated at 1200 °C in air. The results indicate that increasing ZrB 2 content improves the oxidation resistance of the coatings. When ZrB 2 content increases from 30 to 45 wt%, weight loss rates of the coated samples after oxidation at 1200 °C for 120 min decrease from −0.92% to −1.67%. Increasing binder solution concentration raises component content in the coatings. As PVB–ethanol binder concentration increases from 0.025 to 0.075 g mL −1 , weight loss rates of the coated samples after oxidation at 1200 °C for 120 min decrease from 0.32% to −0.38%. Excellent oxidation resistance of ZrB 2 –SiC coating is attributed to self-sealing ability of B 2 O 3 and borosilicate glass. The composite glass can inhibit oxygen diffusion by filling defects in the coating promptly. The borosilicate glass phase can enhance the fluidity of the composite glass. ZrO 2 and ZrSiO 4 particles restrict the growth of the microcrack, which improves the oxidation resistance of ZrB 2 –SiC coating.
研究领域:
材料科学
·
涂层技术
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Tongguo Huo,Kai Cao,Jianxin Zheng,Dan Zhu,Yuan Lin,Yu Dai,Jian Wu
The mechanism of β-SiC preparation via chemical vapor deposition (CVD) of the SiCl4–CH4–H2–N2 system remains unclear. Consequently, the change of molar Gibbs free energy of the CVD β-SiC chemical reaction in the SiCl4–CH4–H2–N2 system has been studied by the Helsinki Software Corporation (HSC) Chemistry code for the first time. The role of nitrogen in the reaction was confirmed. Seven potential reaction pathways of CVD β-SiC were presented, and the thermodynamic equilibrium components of each reaction were calculated systematically. The most viable reaction pathway and corresponding optimal temperature range for CVD β-SiC were determined. In addition, a kinetic study of CVD β-SiC was conducted. The microscopic morphology and crystal structure of β-SiC coatings prepared on the graphite surface at different temperatures were charactered by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman, etc. Ultimately, through SEM, XRD, and Raman observation, uniform and dense β-SiC coatings with fine grains and high crystallinity were successfully obtained. Furthermore, large β-SiC-coated graphite trays with diameters of 230 and 465 mm were prepared by CVD using the SiCl4–CH4–H2–N2 system, and the average thickness of β-SiC was about 100.6 μm. This study provides a theoretical basis and technical recommendations for the fabrication of SiC-coated graphite trays used in metal–organic chemical vapor deposition (MOCVD) equipment.
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
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhilun Zhang,Wei Xie,Xuanru Ren,Bingqing Zhao,Ziqi Zhao,Qian Wang,Mingliang Li,Hailong Wang
To enhance oxidation resistance of carbon/carbon (C/C) composite materials at 1973 K in static air, a novel bilayer Yb 2 O 3 -HfB 2 -SiC/SiC (denoted YHSS) coatings were engineered via a two-step process combining pack cementation and slurry method. A substantial loading of ceramic phases (∼60 wt %) was incorporated into the SiC ceramic layer to improve thermal stability of the oxide scale at 1973 K. Following pre-oxidation, the YHSS coatings impart effective oxidation protection to C/C composite materials for over 228 h at 1973 K. Coupled experimental and theoretical analyses confirm that Yb and Hf atoms diffuse into the thermally grown SiO 2 layer, thereby reinforcing the SiO 2 network structure. Furthermore, the coating's exceptional performance is attributed to its dense, flaw-free surface morphology and the homogeneous dispersion of high-content ceramic phases throughout the SiC layer, collectively suppressing oxygen permeation.
研究领域:
材料科学
·
陶瓷涂层
·
高温材料
·
复合材料
·
表面工程
✓ 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）