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Transient fuel performance analysis of UO_(2)–BeO fuel with composite sic coated with Cr cladding based on multiphysics method

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Nuclear Science and Techniques 2023年第12期34卷 93-108页

作者： chun‑Yu Yin Shi‑Xin Gao Sheng‑Yu Liu Rong Liu Guang‑Hui Su Li‑Bo Qian School of Nuclear Science and Technology Xi’an Jiaotong UniversityXi’an 710049China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610213China School of Electric Power South China University of TechnologyGuangzhou 510640China

The transient multiphysics models were updated in CAMPUS to evaluate the accident-tolerant fuel performance under accident *** is a fuel performance code developed based on *** simulated results of the UO_(2)–Zircaloy fuel performance under accident conditions were compared with those of the FRAPTRAN code and the experimental data to verify the correctness of the updated ***,multiphysics models of the UO_(2)–BeO fuel and composite sic coated with Cr(sic_(f)/sic-Cr)cladding were implemented in ***,the fuel performance of the three types of fuel cladding systems under Loss of Coolant Accident(LOCA)and Reactivity Insertion Accident(RIA)conditions was evaluated and compared,including the temperature distribution,stress distribution,pressure evolution,and cladding failure *** results showed that the fuel temperature of the UO_(2) fuel under accident conditions without pre-irradiation was lower after being combined with sic_(f)/sic-Cr ***,the centerline and outer surface temperatures of the UO_(2)–BeO fuel combined with sic_(f)/sic-Cr cladding reduced further under accident *** cladding temperature increased after the combination with the sic_(f)/sic-Cr cladding under accident conditions with *** addition,the use of sic_(f)/sic-Cr cladding significantly reduced the cladding hoop strain and plenum pressure.

关键词： Accident condition Fuel performance UO2–BeO fuel sicf/sic-Cr cladding

Fabrication of solid-phase-sintered Si C-based composites with short carbon fibers

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International Journal of Minerals,Metallurgy and Materials 2014年第11期21卷 1141-1145页

作者： Xian-hui Li Qing-zhi Yan Yong-jun Han Mei-qi Cao Chang-chun Ge Institute of Special Ceramics and Powder Metallurgy University of Science and Technology Beijing

Solid-phase-sintered Si C-based composites with short carbon fibers（Csf/SSi C） in concentrations ranging from 0 to 10wt% were prepared by pressureless sintering at 2100°C. The phase composition, microstructure, density, and flexural strength of the composites with different Csf contents were investigated. SEM micrographs showed that the Csf distributed in the SSi C matrix homogeneously with some gaps at the fiber/matrix interfaces. The densities of the composites decreased with increasing Csf content. However, the bending strength first increased and then decreased with increasing Csf content, reaching a maximum value of 390 MPa at a Csf content of 5wt%, which was 60 MPa higher than that of SSi C because of the pull-out strengthening mechanism. Notably, Csf was graphitized and damaged during the sintering process because of the high temperature and reaction with boron derived from the sintering additive B4C; this graphitization degraded the fiber strengthening effect.

关键词： fiber-reinforced composites silicon carbide carbon fibers solid phase sintering microstructure

Quantitatively Exploring the Effect of a Triangular Electrode on Performance Enhancement in a 4H-sic Metal-Semiconductor-Metal Ultraviolet Photodetector

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Chinese Physics Letters 2011年第6期28卷 329-332页

作者： CHEN Bin YANG Yin-Tang CHAI Chang-chun ZHANG Xian-Jun Key Laboratory of Ministry of Education for Wide Band-Gap Semiconductor Materials and Devices School of MicroelectronicsXidian UniversityXi'an 710071

A model of novel triangular electrode metal-semiconductor-metal(TEMSM)and conventional electrode metal-semiconductor-metal(CEMSM)detectors is established by utilizing the ISE-TCAD *** comparing the simulated results of TEMSM and CEMSM with experimental data,the model validity is verified and the TEMSM detector shows a superiority of a 113%photocurrent increase of 25.4 nA and similar low dark current of 3.16 pA at 30 V bias over the CEMSM ***,the electrode angleα,width W and spacing S are optimized to obtain the enhanced device features including high UV−to-visible rejection ratio and large responsivity,*** 30 V bias,the maximum UV-to-visible rejection ratio,comparable responsivity and external quantum efficiency at 310 nm are 13049,0.1712 A/W and 68.48%for a TEMSM detector with device parameters ofα=60°,W=3μm and S=4μm,respectively.

关键词： electrode visible utilizing

Textured and toughened high-entropy(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C-sicw ceramics

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Journal of Materials Science & Technology 2021年第35期94卷 99-103页

作者： Si-chun Luo Wei-Ming Guo Yu-Zhang Zhou Kevin Plucknett Hua-Tay Lin School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006China College of Mechanical and Electronic Engineering Pingxiang UniversityPingxiang337000China Department of Process Engineering and Applied Science Dalhousie UniversityHalifax B3J 1Z1Canada

High-entropy(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C ceramics,with different contents(0,5,10,and 20 vol.%)of Si C whiskers(sicw),were fabricated by spark plasma sintering using raw powders synthesized via carbothermal *** application of a uniaxial compaction force led to texture development of the sicw within the(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C *** toughness increased with the increase in sicw content,while Vickers hardness remains almost *** toughness of(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C-20 vol.%sicw ceramics reached 4.3±0.3 MPa m^(1/2),which was approximately 43%higher than that of the monolithic(Ti_(0.2)Zr_(0.2)Hf_(0.2)Nb_(0.2)Ta_(0.2))C ceramic(3.0±0.2 MPa m1/2).The main toughening mechanisms were attributed to crack deflection,whisker debonding,and whisker pullout.

关键词： High-entropy carbide ceramics Silican carbide whiskers Microstructure Mechanical properties Toughening mechanism

Identification of novel HLA-A 0201-restricted epitopes from anterior gradient-2 as a tumor-associated antigen against colorectal cancer

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Cellular & Molecular Immunology 2012年第2期9卷 175-183页

作者： Hyun Ju Lee Cheol Yi Hong chun-Ji Jin Mi-Hyun Kim youn-Kyung Lee Thanh-Nhan Nguyen-Pham Hyunah Lee Byoung Chul Park Ik-Joo chung Hyeoung-Joon Kim Je-Jung Lee Research Center for Cancer Immunotherapy Chonnam National University Hwasun Hospital Hwasun Jeollanamdo Korea Department of Hematology-Oncology Chonnam National University Gwangju Korea VaxcelI-Bio Therapeutics Hwasun Jeollanamdo Korea Samsung Medical Center Sungkyunkwan University School of Medicine Seoul Korea Korea Research Institute of Bioscience and Biotechnology （KRIBB） Daejeon Korea The Brain Korea 21 Project Center for Biomedical Human Resources at Chonnam National University Gwangiu Korea

Anterior gradient-2 （AGR2） promotes tumor growth, cell migration and cellular transformation and its enhanced expression is almost completely restricted to malignant tissues, thus making AGR2 an interesting target for the development of immunotherapeutic strategies. We investigated whether the AGR2 molecule comprises human leukocyte antigen （HLA）-A 0201-binding epitopes recognized by human cytotoxic T lymphocytes （CTLs）, which could be targeted in dendritic cell （DC）-based cancer immunotherapy against colorectal cancer （CRC）. We reviewed the sequence of AGR2 for peptides that could potentially bind to HLA-A 0201 with the aid of a computer-based program. Five candidate peptides with different binding scores were synthesized and tested. These peptides were then assessed for their immunogenicity to elicit specific immune responses mediated by CTLs in vitro by means of enzyme-linked immunospot assays and CTL assays. AGR2 was highly expressed in several CRC cell lines, including DK01, DLD1, KM 12C, HCT-8 and HT-29. DCs pulsed with AGR2-P2 （aa 11-19; LLVALSYTL） or AGR2-P4 （aa 127-135; RIMFVDPSL） generated potent CTLs that could lyse T2 cells pulsed with AGR2-P2 or AGR2-P4 and HLA-A0201＋ AGR2-positive CRC cell lines in a strong dose-dependent and HLA-A 0201-restricted manner. In conclusion, these novel epitopes derived from AGR2 protein may be attractive candidates for DC-based immunotherapy for CRC.

关键词： AGR2 colorectal cancer dendritic cell tumor-associated antigen

sicp/Al-Mg-Sc-Zr焊丝对Al-Cu合金焊缝组织性能的影响

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金属材料与冶金工程 2024年第2期52卷 12-16页

作者：刘健胡椿胡坤谭宁伟吴涯马扬航空工业成都凯天电子股份有限公司四川成都610091 陕西航空职业技术学院陕西汉中723000

本文通过搅拌铸造加轧制方法制备出了Al-Mg-Sc-Zr稀土合金焊丝、w(sic)=3%sicp/Al-Mg-Sc-Zr复合材料焊丝。为研究两种焊丝的焊接效果,使用两种焊丝对2024铝合金进行了钨极氩弧焊试验,研究了两种焊丝对2024铝合金焊缝组织性能的影响,研... 详细信息

本文通过搅拌铸造加轧制方法制备出了Al-Mg-Sc-Zr稀土合金焊丝、w(sic)=3%sicp/Al-Mg-Sc-Zr复合材料焊丝。为研究两种焊丝的焊接效果,使用两种焊丝对2024铝合金进行了钨极氩弧焊试验,研究了两种焊丝对2024铝合金焊缝组织性能的影响,研究结果表明:两种焊丝焊接2024铝合金后,复合材料焊丝对应焊缝相比合金焊丝对应焊缝,整个焊缝晶粒尺寸以及Al-Cu中间相均得到了显著细化;复合材料焊丝中sicp的添加可以显著改善铝铜合金焊缝的强度、伸长率,其强度、伸长率相比合金焊丝分别提升了8.0%、34.2%。

关键词：复合材料焊丝稀土合金焊丝显微组织力学性能

A new approach to regulate the photoelectric properties of two-dimensional sic materials:first-principles calculation on B-N co-doping

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Optoelectronics Letters 2020年第3期16卷 205-210页

作者： ZHANG chun-hong ZHANG Zhong-zheng YAN Wan-jun Mathematics and Physics Institute Anshun UniversityAnshun 561000China Avionics and Information Network Engineering Center Anshun UniversityAnshun 561000China Electronic Information Engineering Institute Anshun UniversityAnshun 561000China

This paper describes a new approach to regulate the photoelectric properties of two-dimensional sic *** first-principles pseudo-potential plane wave method is used to calculate the geometric structure,electronic structure and optical properties of two-dimensional(2D)sic co-doped by the adjacent elements of C-Si(such as B and N).The results show that:after B-N co-doping,the supercell lattices of 2D sic are observed obviously deformation near the doped ***,the band structures of 2D sic co-doped by B-N become *** the impurity level enters the forbidden band,the band gap decreases,and the distribution of density of states near the Fermi level changes *** calculation of optical properties shows that the ability to absorb electromagnetic waves of 2D sic has been enhanced obviously in the low energy range after B-N *** reason is originated from the transition of the 2p state of B and *** the same time,the static dielectric constant increases and the peak of reflectivity *** above results indicate that the optoelectronic properties of 2D sic can be modulated by co-doping B-N.

关键词： dimensional properties calculation

Preparation of β-sic by combustion synthesis in a large-scale reactor

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International Journal of Minerals,Metallurgy and Materials 2009年第3期16卷 322-326页

作者： Yu-qiong Liu Li-feng Zhang Qing-zhi Yan Xiao-dong Mao Qiao Feng Chang-chun Ge Laboratory of Special Ceramics and Powder Metallurgy University of Science and Technology Beijing Beijing 100083 China Beijing chunshu Rectifier Co. Ltd. Beijing 100040 China

The feasibility of 5 kg β-sic synthesized in one batch was demonstrated through igniting the mixture of Si, C-black and polytetrafluoroethylene （PTFE） under different nitrogen pressures. The effect of experimental parameters, including the contents of PTFE, nitrogen pressure, preheating, and raw materials distribution forms were investigated. The results show that the products are β-sic with equiaxed grains. The average grain size is less than 200 nm. The powders loaded loosely promote reaction heat dispersing, resulting in small grains. High purity β-sic powders are obtained when the PTFE content is as low as 5wt%, which simplifies the process and decreases the cost effectively. The ceramic sintered from the obtained β-sic powders presents the hardness of 22.20 GPa, the bending strength as high as 715.15 MPa and the fracture toughness of 8.179 MPa·m^1/2, which are higher than those of ceramics fabricated with α-sic produced by combustion synthesis.

关键词： silicon carbide combustion synthesis β-sic reaction parameter large-scale reactor self-propagating high-temperature synthesis

Diamond/β-sic film as adhesion-enhanced interlayer for top diamond coatings on cemented tungsten carbide substrate

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Journal of Materials Science & Technology 2017年第10期33卷 1097-1106页

作者： Qingquan Tian Nan Huang Bing Yang Hao Zhuang chun Wang Zhaofeng Zhai Junhao Li Xinyi Jia Lusheng Liu Xin Jiang Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China University of Chinese Academy of Sciences Beijing 100049 China Institute of Materials Engineering University of Siegen Paul-Bonatz-Str. 9-11 57076 Siegen Germany

In present work, diamond/β-sic composite interlayers were deposited on cemented tungsten carbide（WC-6%Co） substrates by microwave plasma enhanced chemical vapor deposition（MPCVD） using H2,CH4 and tetramethylsilane（TMS） gas mixtures. The microstructure, chemical bonding, element distribution and crystalline quality of the composite interlayers were systematically characterized by means of field-emission scanning electron microscopy（FE-SEM）, X-ray diffraction（XRD）, X-ray photoelectron spectrometer（XPS）, electron probe microanalysis（EPMA）, Raman spectroscopy and transmission electron microscropy（TEM）. The influences of varying TMS flow rates on the diamond/β-sic composite interlayers were investigated. Through changing the TMS flow rates in the reaction gas, the volume fraction of β-sic in the composite interlayers were tunable in the range of 12.0%–68.1%. XPS and EPMA analysis reveal that the composite interlayers are composed of C, Si element with little cobalt distribution. The better crystallinity of the diamond in the composite is characterized based on the Raman spectroscopy, which are helpful to deposit top diamond coatings with high quality. Then, the adhesion of top diamond coatings were estimated using Rockwell C indentation analysis, revealing that the adhesion of top diamond coatings on the WC-6%Co substrates can be improved by the interlayers with the diamond/β-sic composite structures. Comprehensive TEM interfacial analysis exhibits that the cobalt diffusion is weak from WC-6%Co substrate to the composite interlayer. The homogeneous microcrystalline diamond coatings with the most excellent adhesion can be fabricated on the substrates with the composite interlayer with the β-sic/diamond ratio of about 45%. The composite structures are appropriate for the application in high-efficiency mechanical tool as a buffer layer for the deposition of the diamond coating.

关键词： Diamond/β-sic Interlayer Microstructure Adhesion MPCVD