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Journal of Advanced Ceramics 2024年第7期13卷 956-966页

作者： Cuiyan Li Ruinan Gao haibo ouyang Tianzhan Shen Zihao Chen Yanlei Li Key Laboratory for Green Manufacturing&Functional Application of Inorganic Materials School of Materials Science and EngineeringShaanxi University of Science and TechnologyXi’an 710021China

To meet the emerging demands for thermal protection materials for hypersonic aircraft,developing porous ultrahigh-temperature ceramics with both robust mechanical properties and superior thermal insulation performance is a critical ***,we report novel porous(Ta_(0.2)Nb_(0.2)Ti_(0.2)Zr_(0.2)Hf_(0.2))C high-entropy carbide(PHEC)ceramics fabricated by a self-foaming method using commercially available metal chloride and furfuryl alcohol(FA)as *** PHEC ceramics are constructed of microspheres with a size of 2µm,leading to a high porosity of 91.3%and an interconnected *** microspheres consist of high-entropy carbide grains(20 nm),resulting in abundant interfaces and nanosized pores in the PHEC *** to its unique hierarchical structure,the prepared PHEC ceramics have outstanding compressive strength(28.1±2 MPa)and exceptionally low thermal conductivity(κT,0.046 W·m^(-1)·K^(-1))at room *** makes it a promising thermal insulation materials for ultrahigh temperature *** work provides a cost-effective and facile strategy for producing porous ultrahigh-temperature ceramics.

关键词： porous ceramics high-entropy carbides hierarchical structure thermal insulation self-foaming

ZrB_2 particles reinforced glass coating for oxidation protection of carbon/carbon composites

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Journal of Advanced Ceramics 2019年第1期8卷 102-111页

作者： Cuiyan LI Guibiao LI haibo ouyang Jing LU School of Materials Science & Engineering Shaanxi University of Science & Technology

A dense ZrB_2 particles reinforced glass(ZrB_2/SiO_2) coating was prepared on the SiC coated carbon/carbon composites by a facile sol-dipping approach. The prepared ZrB2/SiO2 coating could protect the composites from being oxidized for 160 h at 1773 K with a weight loss of 6.9 mg/cm^2. The flexural strength retention ratio of the ZrB_2/SiO_2 coated composites is 87% after oxidation for 160 h at1773 K. The continuous SiO_2 glass layer embedded with the submicron ZrSiO_4 particles was formed during oxidation. This was helpful to lower the diffusion rate of oxygen and improve the stability of SiO_2 glass film, thus improving the oxidation resistance of the coated samples. After thermal cycles between 1773 K and room temperature for 15 times, penetrated cracks formed in the coating. The weight loss of the ZrB_2/SiO_2 coated sample presented linear relationship, and the final weight loss per unit area was 6.35 mg/cm^2. The generation of the penetrative cracks and the debonded coating interface resulted in the failure of the ZrB_2/SiO_2 coating.

关键词： ZrB2/SiO2 coating silica sol dipping oxidation resistance

Effect of Mo/Si Ratio on the Microstructure and Oxidation Resistance of Si-Mo Coating for C/C Composites

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稀有金属材料与工程 2009年第A3期38卷 109-112页

作者： Zhang Yulei Li Hejun Fu Qiangang Li Kezhi ouyang haibo C/C Composites Research Center Key Laboratory of Superhigh Temperature Composites Northwestern Polytechnical University Xi＇an 710072 China

Oxidation protective Si-Mo coatings were prepared by pack cementation on the surface of C/SiC coated carbon/carbon composites. The influences of Mo/Si mass ratio in the pack powders on the microstructure and oxidation resistance of the coating were investigated. It showed that with the Mo/Si ratio increasing from 0.1 to 0.4, the MoSi2 proportion and the dimension of cracks in the coating increased, and the oxidation protective ability of the coated specimens firstly increased and then decreased. The coating with the Mo/Si of 0.2 exhibited better oxidation protective ability because of its more suitable MoSi2 proportion and excellent microstructure than those with the Mo/Si of 0.1, 0.3 and 0.4, which could effectively protect C/C composites from oxidation at 1773 K in air for more than 100 h. The mass loss of the coated samples was primarily due to the reaction between C/C matrix and oxygen diffusing through the penetration cracks in the coating.

关键词：氧化硅钼涂层复合材料保护能力物理性能

In Situ Synthesis of Core-Shell Li4Ti5O(12) @ Polyaniline Composites with Enhanced Rate Performance for Lithium-ion Battery Anodes

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Journal of Materials Science & Technology 2017年第3期33卷 231-238页

作者： Yani Hui Liyun Cao Zhanwei Xu Jianfeng Huang haibo ouyang Jiayin Li Hailing Hu School of Materials Science & Engineering Shaanxi University of Science and Technology Xi'an 710021 China

The core-shell Li4Ti5O（12） @ polyaniline composites（LP） have been synthesized via an in situ synthesis with different mole ratios（25：1, 50：1 and 100：1, aniline：LTO）. As an anode material of lithium-ion batteries,the LP-2 electrodes（50：1） exhibit a high initial reversible capacity of 205 mAh g^（-1）with an initial coulombic efficiency of 97.6% at 0.1 C. Even at a high current density of 10 C, the reversible capacity of the LP-2 electrodes still remains at 102 mAh g^（-1）. Moreover, the LP-2 electrodes retain an impressive high capacity of 161 mAh g^（-1）after 100 cycles at 1 C, with 0.11% capacity fading per cycle. The promising electrochemical performance may be attributed to the significantly decreasing charge-transfer impedance of the LP composite and reductive polarity difference between the cathode and the electrolyte.

关键词： Li4Ti5O(12) Polyaniline Lithium-ion batteries Electrochemical property

Fabrication of Short Carbon Fiber Reinforced AZ91D Alloy by Infiltration-Extrusion Integrated Technique

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稀有金属材料与工程 2009年第A3期38卷 100-104页

作者： ouyang haibo Li Hejun Qi Lehua Li Zhengjia Su Lizheng Wei Jianfeng C/C Composites Research Center Key Laboratory of Ultrahigh Temperature Composites Northwestern Polytechnical University Xi＇an 710072 China

Short carbon fiber reinforced AZ91D alloy (Csf/AZ91D) was fabricated by the infiltration-extrusion method. The short carbon fiber preform was infiltrated with melted AZ91D alloy under the assistant of gas pressure. The extrusion processing was applied following the infiltration processing directly. The tensile property and microstructure of the Csf/AZ91D and that of the die-casting and extruded AZ91D alloy was compared. The results show that the short carbon fiber reinforced AZ91D alloy present excellent tensile property. The tensile strength and modulus of elasticity of Csf/AZ91D is about 50% and 18% higher than that of cast AZ91D alloy, respectively. The elongation to fracture of Csf/AZ91D is about 50% lower than that of AZ91D alloy.

关键词：碳纤维增强镁合金制备方法物理性能微观结构

Effect of Temperature on the Synthesis of SiC Coating on Carbon Fibers by the Reaction of SiO with the Deposited Pyrolytic Carbon Layer

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Journal of Materials Science & Technology 2010年第3期26卷 211-216页

作者： Hejun Li,haibo ouyang,Lehua Qi,Yulei Zhang,Zhengjia Li and Jianfeng Wei C/C Composites Research Center,Key Laboratory of Ultrahigh Temperature Composites,Northwestern Polytechnical University,Xi an 710072,China C/C Composites Research Center Key Laboratory of Ultrahigh Temperature Composites Northwestern Polytechnical University Xi'an 710072 China

The influence of reaction temperature on the preparation of SiC coating on carbon fibers by the reaction of silicon monoxide with the deposited pyrolytic carbon （PyC） layer has been *** rising reaction temperature,the thickness of SiC layer increases and the SiC grain is *** apparent activation energy for the synthesis of SiC layer is about 103.3 kJ/*** oxidation resistance of carbon fiber can be improved by the SiC/PyC layers *** initial oxidation temperature of the SiC/PyC coated carbon fiber is about 300℃ higher than that of the uncoated carbon *** oxidation of the SiC/PyC coated carbon fiber is owing to the diffusion of oxygen through the cracks generated by the mismatch of thermal expansion.

关键词： Carbon fiber SiC coating Pyrolytic carbon Oxidation behavior

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HfC改性炭／炭复合材料的烧蚀性能

稀有金属材料与工程 2006年第A2期35卷 365-368页

作者：李翠艳李克智欧阳海波李贺军西北工业大学陕西西安710072

采用金属盐溶液浸渍-TCVI(Thermal Gradient Chemical Vapor Infiltration)法制备了HfC改性炭／炭复合材料。通过氧-乙炔烧蚀实验测试了不同含量HfC改性炭／炭复合材料的抗烧蚀性能;利用DSC-TG,SEM,XRD分析了HfC的形成过程、材料烧蚀前... 详细信息

采用金属盐溶液浸渍-TCVI(Thermal Gradient Chemical Vapor Infiltration)法制备了HfC改性炭／炭复合材料。通过氧-乙炔烧蚀实验测试了不同含量HfC改性炭／炭复合材料的抗烧蚀性能;利用DSC-TG,SEM,XRD分析了HfC的形成过程、材料烧蚀前后的微观形貌及物相组成。结果表明:HfC的加入降低了炭／炭复合材料的线烧蚀率,其中HfC含量为6．5％(质量分数,下同)的炭／炭复合材料的线烧蚀率最低。HfC具有抑制氧化及弥补缺陷的作用,从而降低了炭／炭复合材料的热化学烧蚀和机械剥蚀。

关键词：炭/炭复合材料烧蚀 HfC 微观形貌

液态浸渗挤压制备(AlBO)_w/Al复合材料缺陷分析

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稀有金属材料与工程 2007年第12期36卷 2144-2147页

作者：李正佳李贺军齐乐华欧阳海波魏剑西北工业大学碳/碳复合材料工程技术研究中心陕西西安710072

采用液态浸渗挤压法制备了硼酸铝晶须增强铝基复合材料(简称(AlBO)w/Al),通过OM,XRD,EDS,SEM及TEM等研究手段对其微观缺陷进行观察分析。发现(AlBO)w/Al复合材料中的主要缺陷并非硼酸铝晶须与基体之间的界面反应产物,而是制备过程中晶... 详细信息

采用液态浸渗挤压法制备了硼酸铝晶须增强铝基复合材料(简称(AlBO)w/Al),通过OM,XRD,EDS,SEM及TEM等研究手段对其微观缺陷进行观察分析。发现(AlBO)w/Al复合材料中的主要缺陷并非硼酸铝晶须与基体之间的界面反应产物,而是制备过程中晶须的偏聚重融、基体合金中析出的铜铝化合物Al2Cu及显微缩孔,它们作为复合材料的主要缺陷而成为裂纹源,最终影响复合材料的力学性能。

关键词：液态浸渗挤压铝基复合材料铜铝化合物缺陷

微波水热法制备Cr^(3+)掺杂ZnO纳米晶及其光催化性能

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硅酸盐学报 2013年第12期41卷 1692-1696页

作者：李丹黄剑锋曹丽云李嘉胤欧阳海波陕西科技大学教育部轻化工助剂化学与技术重点实验室西安710021

以Zn(NO3)2·6H2O为锌源、Cr(NO3)3·9H2O为铬源,采用微波水热法制备了不同Cr3+掺杂比例的Zn1–(3/2)x Crx O纳米晶。借助于X射线衍射、扫描电子显微镜和紫外–可见(UV–Vis)光谱分别对产物的物相、形貌和光学性能进行分析。结果表明:随... 详细信息

以Zn(NO3)2·6H2O为锌源、Cr(NO3)3·9H2O为铬源,采用微波水热法制备了不同Cr3+掺杂比例的Zn1–(3/2)x Crx O纳米晶。借助于X射线衍射、扫描电子显微镜和紫外–可见(UV–Vis)光谱分别对产物的物相、形貌和光学性能进行分析。结果表明:随着Cr3+掺杂量的增加,ZnO纳米晶的衍射峰向高角度方向漂移;ZnO纳米晶的显微结构呈片状,且由规则片层结构向无规则片状结构转变;UV–Vis光谱分析表明,所制备Cr3+掺杂ZnO纳米晶对紫外光有强烈的吸收,其禁带宽度减小。可见光催化测试结果表明,Cr3+掺入使氧化锌的光催化性能有所提高,当掺杂量为5%时,其光催化性能最优,对罗丹明B的降解率达到96.4%。

关键词：氧化锌掺铬微波水热法光催化性能

水热共沉积-碳热还原反应法制备的C/C-CuNi复合材料微观结构及性能

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固体火箭技术 2022年第5期45卷 756-763页

作者：张晨鸽欧阳海波李翠艳董继杰陕西科技大学材料科学与工程学院西安710021

以葡萄糖为碳源,硝酸镍为镍源,硫酸铜为铜源,采用水热共沉积-碳热还原法制备了C/C-CuNi复合材料。由于水热过程中碳、NiO和CuO的共沉积,CuNi合金均匀分散在复合材料中。Ni的加入不仅提高了碳基体的石墨化程度,而且增强了纤维/基体界面... 详细信息

以葡萄糖为碳源,硝酸镍为镍源,硫酸铜为铜源,采用水热共沉积-碳热还原法制备了C/C-CuNi复合材料。由于水热过程中碳、NiO和CuO的共沉积,CuNi合金均匀分散在复合材料中。Ni的加入不仅提高了碳基体的石墨化程度,而且增强了纤维/基体界面的结合。分散在碳基体中的CuNi合金能有效提高材料的耐磨性。当Ni/Cu摩尔比为0.6时,复合材料表现出优异的性能。它具有高弯曲强度(92.4 MPa)和低电阻率(10.78μΩ·m)。在10 N载荷下,摩擦系数稳定在0.223,磨损率仅为0.45 g/h。其优异的摩擦学性能来源于微层裂疲劳磨损和镍加入形成的自润滑膜。这一简单易行的策略有望为高耐磨性的C/C-CuNi复合材料的设计和制备提供启示。

关键词： C/C-CuNi复合材料水热共沉积微观结构力学性能摩擦学性能