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| 1 | ZrC-ZrB_2-SiC ceramic nanocomposites derived from a novel single-source precursor with high ceramic yield显示文摘For the first time, ZrC-ZrB_2-SiC ceramic nanocomposites were successfully prepared by a single-source-precursor route, with allylhydridopolycarbosilane(AHPCS),triethylamine borane(TEAB),and bis(cyclopentadienyl) zirconium dichloride(Cp_2 ZrCl_2) as starting materials. The polymer-to-ceramic transformation and thermal behavior of obtained single-source precursor were characterized by means of Fourier transform infrared spectroscopy(FT-IR) and thermal gravimetric analysis(TGA). The results show that the precursor possesses a high ceramic yield about 85% at 1000 ℃.The phase composition and microstructure of formed ZrC-ZrB_2-SiC ceramics were investigated by means of X-ray diffraction(XRD) and high resolution transmission electron microscopy(HRTEM).Meanwhile, the weight loss and chemical composition of the resultant ZrC-ZrB_2-SiC nanocomposites were investigated after annealing at high temperature up to 1800 ℃. High temperature behavior with respect to decomposition as well as crystallization shows a promising high temperature stability of the formed ZrC-ZrB_2-SiC nanocomposites. | Zhaoju YU Xuan LV Shuyi LAI Le YANG Wenjing LEI Xingang LUAN Ralf RIEDEL | 2019 | Journal of Advanced Ceramics2019，8，1： | 8 |
| 2 | Ablation characteristics of mosaic structure ZrC-SiC coatings on low-density, porous C/C composites显示文摘Mosaic structure ZrC-SiC coatings were fabricated on low-density, porous C/C composites via thermal evaporation and an in-situ method. ZrC was packed in a typical lamellar mode, and the mosaic structure was formed by the deposition of Zr and Si atoms on the shallow surface of the porous C/C composites.Ablation analysis showed that the defects in the coatings originate from the boundary between the ZrC and holes created by the consumption of SiC at 2500℃. After ablation for 200 s at 3000℃, a dense ZrO2 layer formed on the coating surface, and the defects were sealed owing to the continuous supply of ablative components. The mass and line ablation rates of the Zr C-SiC coatings were-0.46 ± 0.15 mg cm^-2·s^-1 and-1.00± 0.04 μm s^-1, respectively. | Yonglong Xu Wei Sun Xiang Xiong Fuqun Liu Xingang Luan | 2019 | Journal of Materials Science & Technology2019，35，12： | 4 |
| 3 | Numerical modeling of SiC by low-pressure chemical vapor deposition from methyltrichlorosilane显示文摘The development of functional relationships between the observed deposition rate and the experimental conditions is an important step toward understanding and optimizing low-pressure chemical vapor deposition(LPCVD)or low-pressure chemical vapor infiltration(LPCVI).In the field of ceramic matrix composites(CMCs),methyltrichlorosilane(CH3 SiCl3,MTS)is the most widely used source gas system for SiC,because stoichiometric SiC deposit can be facilitated at 900°C–1300°C.However,the reliability and accuracy of existing numerical models for these processing conditions are rarely reported.In this study,a comprehensive transport model was coupled with gas-phase and surface kinetics.The resulting gas-phase kinetics was confirmed via the measured concentration of gaseous species.The relationship between deposition rate and 24 gaseous species has been effectively evaluated by combining the special superiority of the novel extreme machine learning method and the conventional sticking coefficient method.Surface kinetics were then proposed and shown to reproduce the experimental results.The proposed simulation strategy can be used for different material systems. | Kang Guan Yong Gao Qingfeng Zeng Xingang Luan Yi Zhang Laifei Cheng Jianqing Wu Zhenya Lu | 2020 | Chinese Journal of Chemical Engineering2020，28，6： | 3 |
| 4 | Preparation and Arc Erosion Resistance of C_f/Cu Composite by Vacuum Melting Infiltration显示文摘Cf/Cu composite was prepared by vacuum melting infiltration. Tiand Cr were doped to the Cu alloy to improve the wettability between Cu and carbon. The microstructure was investigated by XRD, SEM and EDS. The arc erosion rate of Cf/Cu composite was investigated in vacuum. The results showed that the Tiand Cr could improve the wettability between Cu and C/C preform and the infiltration ability of Cu into C/C preform greatly. A TiC interface formed between the fibers and matrix. The good bonding between the fiber and matrix guaranteed that part of the Cu matrix can still be bonded on the fibers even when the material was exposed to the plasma. Consequently, the carbon fibers were protected from the erosion. In comparison, Cu was completely consumed by the arc erosion. Hence, the graphite was eroded and presented a caulifl ower-like morphology. Therefore, the prepared Cf/Cu had better ability to resist the arc erosion, compared with common Cu-C material. | 张华煜 LIU Yiwen ZHAO Xianling LUAN Xingang | 2014 | Journal of Wuhan University of Technology(Materials Science)2014，29，5： | 3 |
| 5 | Realtime damage evaluation of a SiC coated carbon/carbon composite under cyclic fatigue at high temperature in an oxidizing atmosphere显示文摘 | Chidong Liu Laifei Cheng Xingang Luan | 2009 | Materials Science and Engineering A2009，，524： | 1 |
| 6 | Oxidation and defect control of CVD SiC coating on three-dimensional C/SiC composites 显示文摘 | Cheng Laifei Xu Yongdong Zhang Litong Luan Xingang | 2002 | Carbon2002，40，12： | 1 |
| 7 | Damage evolution and real-time non-destructive evaluation of2D carbon-fiber/SiC-matrix composites under fatigue loading显示文摘 | Liu Chidong Cheng Laifei Luan Xingang Li Bin Zhou Jun | 2008 | Materials Letters2008，62，24： | 1 |
| 8 | Laser ablation behaviors of C/SiC composites in air显示文摘Ablation behaviors of silicon carbide(SiC)coated 2Dcarbon fiber reinforced silicon carbide matrix(designated as 2DC/SiC)composites prepared by chemical vapor infiltration(CVI)were investigated by a continuous wave CO2 laser.The 2DC/SiC specimens were exposed under laser for 0.5sin ambient air,and the laser powers varied from 500Wto 1500W.A 3Dfinite element model was established to calculate the temperature distribution in the laser ablation process.The ablation depth,width and profile were measured by Laser Confocal Microscope(LCM).The results indicate that the increase of ablation depth follows a linear relation with the increase of laser power,and the increase of ablation width follows a similar trend with the increase of the isotherm diameter of 1712℃.The ablated surface can be distinguished into three different regions by scanning electron microscope(SEM)observation,including ablation center,transition zone and ablation fringe.The ablation behaviors of carbon fibers and SiC matrices in different regions were presented and discussed in the study. | SU Meng CHENG Laifei LUAN Xingang ZHANG Litong | 2013 | 复合材料学报2013，30，6： | 1 |
| 9 | Oxidation and defect control of CVD SiC coating on three- dimensional C/SiC composites显示文摘 | Laifei Cheng Yongdong Xu Litong Zhang Xingang Luan | 2002 | Carbon2002，40，： | 1 |
| 10 | Oxidation and defect control of CVD SiC coating on three dimensional C/SiC composites 显示文摘 | Laifei Cheng Yongdong Xu Litong Zhang Xingang Luan | 2002 | Carbon2002，40，： | 1 |
| 11 | Environmental performance testing system for thermostructure materials applied in aeroengines显示文摘 | ZHANG Litong CHENG Laifeng LUAN Xingang | 2006 | Key Engineering Materials2006，313，： | 1 |
| 12 | High-temperature fatigue behavior of SiC-coated carbon/carbon composites in oxidizing atmosphere显示文摘 | Liu Chidong Cheng Laifei Luan Xingang | 2009 | J Eur Ceram Soc2009，29，3： | 1 |
| 13 | Preparation and arc erosion resistance of C f /Cu composite by vacuum melting infiltration显示文摘 | Huayu Zhang Yiwen Liu Xianling Zhao Xingang Luan | 2014 | Journal of Wuhan University of Technology-Mater. Sci. Ed2014，，5： | 1 |
| 14 | Preparation of ZrC-SiC composite coatings by chemical vapor deposition and study of co-deposition mechanism显示文摘In this work, the Zr C-SiC composite coatings were co-deposited by chemical vapor deposition(CVD)using ZrCl4, MTS, CH4 and H2 as raw materials. The morphologies, compositions and phases of the composite coatings were characterized by scanning electron microscopy(SEM), energy dispersive X-ray spectroscopy(EDS) and X-ray diffraction(XRD). The results indicated that the morphologies, compositions and phases of the composite coatings were related to the deposition temperature, the flow rate of the carrier H2 gas, and the ratio of C/Zr. Moreover, the co-deposition mechanism of the composite coatings was also studied. It was found that different deposition temperatures resulted in different deposition mechanisms. At temperatures in the range of 1150–1250℃, the Zr C-SiC co-deposition was controlled by the surface kinetic process. At temperatures in the range of 1250–1400℃, the Zr C-SiC co-deposition was controlled by the mass transport process. | Qiaomu Liu Jia Liu Xingang Luan | 2019 | Journal of Materials Science & Technology2019，35，12： | 0 |
| 15 | Damage behavior of atomic oxygen on CVD SiC coating-modified carbon/carbon composite in low earth orbit environment显示文摘In this work, samples of carbon/carbon(C/C) and chemical vapor deposited(CVD) SiC-coated C/C samples were investigated to understand the AO damage mechanism in low Earth orbit(LEO) environment. The ground-based simulated atomic oxygen(AO) generator was employed. Results indicate that the CVD SiC coating exhibited improved radiation resistance properties against AO radiation as evidenced by a 16%better strength retention ratio, 60% less mass ablation, and increased strength stability. The magnitude of these influences affected the surface morphology, as observed by scanning electron microscopy(SEM)and surface resistance meter test results. The variations in the surface constituents were confirmed by X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS) results. The main products left on surface after AO exposure are SiO2 and SiCxOyfilm. Additionally, Si atoms are found to be the preferential reacting element in the SiC coating, and this process is accompanied by graphite precipitation, grain growth, and crack necking. Also, the damage mechanism of the AO-exposed SiC coating was revealed and is discussed. | Guanghai Liu Laifei Cheng Xingang Luan Jiaxin Zhang | 2019 | Journal of Materials Science & Technology2019，35，12： | 0 |
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