检索结果-内蒙古大学图书馆

第二十一届国际复合材料大会

作者： Dongyang Zhang Ping Hu Xinghong Zhang Science and Technology on Advanced Composites in Special Environment Laboratory Harbin Institute of Technology

High-performance ZrB-SiC composites with homogeneous microstructures had been fabricated by centrifugal gel casting and pressureless *** effects of pH value, dispersant and solid loading on the stability and rheological properties of ZrB-SiC slurries were investigated *** ZrB-SiC suspensions with solid loading up to 48 vol.% were achieved when 0.6 wt.% polyacrylic acid（PAA） was added with pH=11, which was favourable for centrifugal gel casting *** pressureless sintering at 1900 ℃ for 2 h, ZrB-SiC ceramics exhibited a homogeneous microstructure and an excellent mechanical properties, and the relative density, flexural strength and fracture toughness of such material were 91.2 %, 370 ± 10 MPa and 3.67 ± 0.19 MPa·m, *** work provide a promising method to fabricate uniform multiphase materials with high packing density.

关键词： ZrB2-SiC Centrifugal gel casting Pressureless sintering Mechanical properties

来源：评论

学校读者我要写书评

暂无评论

CF/CERAMIC HYBRIDS WITH GREAT HOMOGENEOUSLY ARRANGED CARBON FIBERS PREPARED BY ROLLING-COMPACTION

CF/CERAMIC HYBRIDS WITH GREAT HOMOGENEOUSLY ARRANGED CARBON ...

引用

第二十一届国际复合材料大会

作者： Yuan Cheng Ping Hu Xinghong Zhang Science and Technology on Advanced Composites in Special Environment Laboratory Harbin Institute of Technology

Since the creative initiation by Shindo A in 1959, carbon fibers have never stop the pace to draw attention during the past decades owing to the distinct alliance of remarkable mechanical, thermal and electrical properties as well as high aspect ratios and low densities. Of the particular interest is the tremendous utilization in the reinforcement of composites, as an effective approach to surmount the limitation of mechanical performance for materials, especially the advanced *** ceramics components can withstand higher temperatures than those made from current super alloys,particularly attractive for the key structure of aircraft and engine. However, ceramics are typically brittle materials that are sensitive to ***, optimizing the toughness of advanced ceramics has been the focus for researchers, among which the introduction of carbon fiber has been regarded as the most attractive *** there follows various means to combine carbon fibers into ceramic by far such as mechanical grinding, slurry impregnation, precursor infiltration pyrolysis(PIP), chemical vapor infiltration(CVI), chemical vapor deposition(CVD) and reactive melt infiltration(RMI). However, these means inevitably exists some killing problems, notably the inhomogeneous arrangement of carbon fibers, high porosity, long technology cycle and costly *** this paper, a simple but effective method to fabricate C/Ceramic hybrids was put forward and verified to be feasible by experiments *** fibers were triumphantly introduced into ceramic by rolling compacting *** the result of SEM analysis, the carbon fibers, despite obviously high concentration, are shown to be individually and homogeneously arranged from macroscopic to microscopic distance within the nanostructured ceramic, and consequently the matrix ceramic environment is endowed with a uniform microstructure over macroscale and *** judging from the investigation into p

关键词： Carbon fiber Ceramic Rolling-compaction

来源：评论

学校读者我要写书评

暂无评论

SYNTHESIS AND CHARACTERIZATION OF ULTRALONG SI3N4 NANOBELTS WITH UNIQUE OPTICAL AND FLEXIBLE NANOMECHANICAL PROPERTIES

SYNTHESIS AND CHARACTERIZATION OF ULTRALONG SI3N4 NANOBELTS ...

引用

第二十一届国际复合材料大会

作者： Shun Dong Ping Hu Xinghong Zhang Science and Technology on Advanced Composites in Special Environment Laboratory Harbin Institute of Technology

In this paper, several millimeters long SiN nanobelts（NBs） with a cross-section of 100-700 nm in width and 30-200 nm in thickness were successfully synthesized via an effective method with the raw materials of graphite, nanosilicon and ***-assisted vapor-liquid-solid（VLS） was proposed for the growth mode of ultra-long SiN NBs, in which alumina may be as a novel and highly effective mediator playing an important role in adjusting the content of reactive silicon during the growth of ultra-long SiN *** room-temperature photoluminescence（PL） spectrum showed that the synthesized α-SiN NBs had two strong emissions peaks centered at 551 nm（2.25 eV） and 697 nm（1.78 eV） located in the yellow and red spectral range, which can be explained by the size effect and presence of a small amount of Al, offering an effective method for preparing SiN nanomaterials with unique optical *** situ nanoindentation was used to probe the nanomechanical property of SiN NBs by a hybrid SEM/SPM system and the Young's modulus of a SiN NB with about 300 nm in width and 100 nm in thickness was approximately 483.78 GPa, suggesting much larger than those of bulk and film of the SiN materials, providing value and guidance for studying the properties of SiN nanomaterials and for expanding their possible applications.

关键词： Si3N4 Nanobelts Optical Nanoechanical Nanoindentation

来源：评论

学校读者我要写书评

暂无评论

A MEMBRANE-TYPE ACOUSTIC METAMATERIAL WITH SELF-SIMILAR STRUCTURE

A MEMBRANE-TYPE ACOUSTIC METAMATERIAL WITH SELF-SIMILAR STRU...

引用

2017 2nd Joint International Mechanical,Electronic and Information technology Conference(JIMET 2017)

作者： Yingxu Fan Zhimin Xie Yuhong Qie National Key Laboratory of Science and Technology on Advanced Composites in Special Environment Center for Composite Materials Harbin Institute of Technology

The locally resonant membrane-type metamaterial has a unique feature of narrow frequency band-gaps where the waves can't propagate, therefore it would be not suitable for broadband noise reduction. To broaden the frequency bandgap, we proposed a self-similar structure with ring mass for the membrane-type metamaterial in the present work. The dispersion curves of the self-similar structures under equalbiaxial tension were obtained by using finite element method. It is found that the number of band-gap increases with an increase of the ring mass. In this sense, the frequency bandgap is broadened. The analysis of harmonic response revealed that the anti-resonant frequency was just located in the first band-gap in the dispersion curve diagram. For this antiresonant mode of the local membrane-mass/ring mass resonator, the ring mass vibrated out-of-phase with the membrane, therefore it is anticipated that a transmission loss(TL) peak would appear in the TL profile.

关键词： Self-similar acoustic metamaterial locally resonant band-gap

来源：评论

学校读者我要写书评

暂无评论

Catalytic properties of ZrB2–SiC–W ultra–high temperature ceramics at moderate temperatures

引用

IOP Conference Series: Materials science and Engineering 2019年第1期479卷

作者： N Li P Hu P F Xing B Ke Research Center of Laser Fusion China Academy of Engineering Physics Mianyang 621900 PR China National Key laboratory of Science and Technology on advanced composites in Special Environments Harbin Institute of Technology Harbin 150001 PR China

Catalytic behaviors related to recombination reactions of dissociated oxygen atoms on the surface of ZrB2–SiC–W ultra–high temperature ceramic was investigated quantitatively in the temperature ranges from room temperature to 1300 K, and recombination coefficient can be obtained by the photochemical method based on spectral diagnostic techniques using microwave–discharge plasma apparatus. Oxidation of specimens even at relatively low temperature during the experiment had a significant influence on the catalytic properties of ZrB2–SiC–W ultra–high temperature ceramics, and the results revealed the detectable dependence of the catalytic properties upon environment–induced surface modification. The relationship between catalytic properties of ZrB2–SiC–W ultra–high temperature ceramics and surface microstructure was also discussed in detail.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Towards air stability of ultra-thin gase devices: Avoiding environmental and laser-induced degradation by encapsulation

arXiv

引用

arXiv 2018年

作者： Zhao, Qinghua Frisenda, Riccardo Gant, Patricia de Lara, David Perez Munuera, Carmen Garcia-Hernandez, Mar Niu, Yue Wang, Tao Jie, Wanqi Castellanos-Gomez, Andres State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an710072 China Key Laboratory of Radiation Detection Materials and Devices Ministry of Industry and Information Technology Xi'an710072 China MadridE-28049 Spain Campus de Cantoblanco MadridE-28049 Spain National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin China

Gallium selenide (GaSe) is a novel two-dimensional material, which belongs to the layered III-VIA semiconductors family and attracted interest recently as it displays single-photon emitters at room temperature and strong optical non-linearity. Nonetheless, few-layer GaSe is not stable under ambient conditions and it tends to degrade over time. Here we combine atomic force microscopy, Raman spectroscopy and optoelectronic measurements in photodetectors based on thin GaSe to study its long-term stability. We found that the GaSe flakes exposed to air tend to decompose forming firstly amorphous selenium and Ga2Se3 and subsequently Ga2O3. While the first stage is accompanied by an increase in photocurrent, in the second stage we observe a decrease in photocurrent which leads to the final failure of GaSe photodetectors. Additionally, we found that the encapsulation of the GaSe photodetectors with hexagonal boron nitride (h-BN) can protect the GaSe from degradation and can help to achieve long-term stability of the devices. Copyright © 2018, The Authors. All rights reserved.

关键词： Selenium compounds

来源：评论

学校读者我要写书评

暂无评论

Thermal decomposition behavior and ablation resistance of Si-O-C modified carbon fibers reinforcing phenolic resin composites

Thermal decomposition behavior and ablation resistance of Si...

引用

第二十一届国际复合材料大会

作者： Huafei Xue Changqing Hong Xinghong Zhang Haiming Cheng Jiecai Han Key Laboratory of Science and Technology for Advanced Composites in Special Environments Harbin Institute of Technology

The thermal decomposition behavior of phenolic fiber and phenolic resin(PR) matrix was investigated by using a thermo gravimetric analyzer in nitrogen *** ablative properties of the composite specimens were quantitatively evaluated by performing oxyacetylene flame test and plasma arc-heated wind tunnel ablative *** ablative properties of Si-O-C modified carbon fabrics reinforced phenolic resin(Si-O-C/PR) composites were compared with those of carbon fabric reinforced(Cf/PR) *** patterns and microstructures of the ablated composite specimens were also studied with scanning electron microscope, and the advantages of the Si-O-C modified carbon fabrics reinforced composites under ablation conditions were *** decomposition mechanism of Si-O-C modified carbon fibers is more complex compared to which the carbon fibers *** mixture rule can be used to predict the mass loss rate of the Si-O-C/PR composites during the oxyacetylene flame test, mass and liner ablation rates decreases sharply after *** the oxyacetylene flame test, there was no macroscopical crack or delamination can be observed in Si-O-C/PR composite specimens and the carbonaceous residue blocks which were produced by the Si-O-C pre-polymer and the PR were attached well to the carbon *** resistance to heat-flow erosion of the Si-O-C/PR composites had significantly improved and the mass loss of the Si-O-C/PR composites(25.6%) was much lower than those of the Cf/PR composites(58.4%) in the exhaust plume ablative test.A vis-à-vis char layer of the Si-O-C/PR composites formed during this ablation.

关键词： Fiber reinforced polymer composites Phenolic resin Ablative property Decomposition Microstructure

来源：评论

学校读者我要写书评

暂无评论

Fractal characterization of the oxidation structure in ZrB2-SiC composite after thermal shocks

引用

IOP Conference Series: Materials science and Engineering 2019年第1期531卷

作者： F Qi S H Meng P Wu H Guo D Zhao T Chen School of Mechanical and Electric Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215021 China Science and Technology on Advanced Composites in Special Environment Laboratory Harbin Institute of Technology Harbin 150080 China Artificial Organ Laboratory Bio-manufacturing Research Centre School of Mechanical and Electric Engineering Soochow University Suzhou 215021 China Jiangsu Provincial Key Laboratory of Advanced Robotics & Robotics and Microsystems Center Soochow University Suzhou 215021 China

The effect of the oxidation structure on the residual strength of ZrB2-SiC composite after repeated thermal shocks was investigated. The silica-rich glasses on the oxidation surface and pores in the oxidation layer were characterized using the fractal geometry method. Their fractal dimensions were calculated by Box-counting method. The increase of silica-rich glasses and the decrease of pores contributed to the increase of the residual strength of ZrB2-SiC after thermal shocks.

关键词：

来源：评论

学校读者我要写书评

暂无评论

MULTIFUNCTIONAL PATTERN RECONFIGURABLE WRIST ANTENNA STRUCTURES BASED ON BISTABLE COMPOSITE CYLINDERICAL SHELLS FOR ON-BODY APPLICATIONS

MULTIFUNCTIONAL PATTERN RECONFIGURABLE WRIST ANTENNA STRUCTU...

引用

第二十一届国际复合材料大会

作者： Jianqiang Hu Yanqi Li Fuhong Dai National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology

＜正＞Extraordinary research on on-body devices has provided new ideas for medical instruments,healthmonitoring systems and telemedicine *** radio frequency（RF）engineers have developed wearable antennas in the form of wristbands or attachments to clothing[1]–[3].However,these wearable antennas must have sufficient both structure and antenna performance to satisfy the requirements of the rapid development of electronic and wireless communication technologies.

关键词： Bistable composite shells Pattern reconfigurable Multifunctional Wearable antenna

来源：评论

学校读者我要写书评

暂无评论

Turning the amphiphilicity of graphene oxide by grafting lauryl groups for self-assembly of nanostructures at the interface

Turning the amphiphilicity of graphene oxide by grafting lau...

引用

第二十一届国际复合材料大会

作者： Guomin Ding Weicheng Jiao Rongguo Wang Jun Li Yue Niu Yifan Huang National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology

Based on the oxygen functional groups and a network of hydrophobic polyaromatic islands of unoxidized benzene rings, GO should be viewed as an amphiphile with a largely hydrophobic basal plane and hydrophilic edges. The aim of this work was to develop a novel method for tuning the amphiphilicity of graphene oxide（GO）.Hydrophobic lauryl groups were successfully linked to the surface of GO sheets through covalent interactions by the Williamson ether synthesis method, to improve the hydrophobicity;at the same time, the carboxylic groups on the GO sheets were retained to preserve *** morphology and microstructures of the lauryl-modified GO（LGO） were ***, the dispersion stability of LGO was investigated by UV-Visible *** results show that LGO has remarkable amphiphilicity, and LGO can be uniformly and stably dispersed in both strongly polar deionized（DI） water as well as organic solvents such as N-methyl pyrrolidone（NMP） and ethyl acetate（EA）.Further, surface and interfacial tension measurements of LGO and GO suspensions were performed, and the relationship between surface tension and temperature was also *** to GO, LGO has higher surface activity and can be more easily and strongly adsorbed onto interfaces at low *** to this, LGO aqueous solution can form the stable bubbles after violent shock（Figurea.1 a）, showing characteristic of surfactant ***, LGO can reduce the interfacial tension between n-heptane and water by 20.95%, as shown in Figure 1 b,so that it can form stable Pickering emulsions at the interface, without any other ***, the effect of inorganic salts on the LGO surface activity was studied by adding *** results indicate that the surface tension of LGO suspensions can be tuned by changing the inorganic salt ***, the ζ potential test results show that the ζ potential of LGO aqueous solution are-40.6 mV with no NaCl and-30.9

关键词： LGO Turning the amphiphilicity of graphene oxide by grafting lauryl groups for self-assembly of nanostructures at the interface

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：