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Journal of Wuhan University of Technology(Materials Science) 2022年第2期37卷 292-299页

作者： XIONG Lei HUANG Shaohuai ZHONG Rouchao TANG Weizhong LIU Chao JIN Yanqiao co.lege of Materials Science and Engineering Fuzhou UniversityFuzhou 350108China China National R&D Center for tungsten Technology Xiamen Tungsten Co.LtdXiamen 361009China

The inherent difficulty in preservation and processing of co.ventional red phosphorus flame retardant severely limits its growing applications in polymer materials,thus,there is an urgent need to exploit effective technology to modify red *** lignin-based co.pounds can provide a great potential in improving the preservation and processing of red ***,we prepared melamine modified lignin/aluminum phosphate co.ted red phosphorus(LMAP@RP)and used it as the flame retardant of acrylonitrile-butadiene-styrene(ABS)*** 25wt%loading LMAP@RP,the ABS samples show excellent flame inhibiting capacity and reached UL-94 V-0 *** calorimetry test results show that the peak heat release rate,total heat release and total smoke release of ABS/25LMAP@RP are reduced strikingly by 64.6%,49.3%,and 30.1%,*** char residue is 15.36wt%and the char layer is co.tinuous and *** outstanding flame retardant and smoke-suppressant performances of LMAP@RP show its application prospect for ABS.

关键词： lignin red phosphorus ABS flame retardant

Recent research and development of thick CVD tungsten co.tings for fusion application

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tungsten 2020年第1期2卷 83-93页

作者： Zhe Chen You‑Yun Lian Xiang Liu Fan Feng Bin‑You Yan Jian‑Bao Wang Yan‑Wei Lv Jiu‑Peng Song Chun‑Jia Liu Lai‑Zhong Cai Southwestern Institute of Physics Chengdu 610041China China National R&D Center for tungsten Technology Xiamen Tungsten Co.Ltd.Xiamen 361009China

As the interface closest to the edge plasma of a fusion reactor reacting deuterium(D)and tritium(T),plasma-facing material(PFM)need to withstand extreme service co.ditions with the high particle flux,high heat load,and neutrons with energy up to 14.1 ***(W)is the primary candidate of PFMs in future fusion reactors due to its high melting point,good thermal co.ductivity,excellent irradiation resistance,and low hydrogen/helium *** far,powder metallurgy is a leading route for the preparation of W-based *** alternative approach co.ld be the co.ting technique,which has advantages on fabricating W PFMs and plasma-facing co.ponent(PFC)*** the past several years,inspiring results were achieved in the preparation process and performance evaluation of the W co.ting with high purity,excellent thermal co.ductivity,and thickness at the millimeter level by atmospheric pressure chemical vapor deposition(APCVD).No obvious grain growth and hardness decrease were observed when the annealing temperature was lower than 1500°C,indicating its good thermal *** as-deposited co.ting exhibited a co.parable thermal shock resistance with the co.ventional W *** the polished sample showed a high crack threshold(0.33-0.44 GW·m^(−2))when exposed to edge localized mode like transient at room temperature,co.pared to the unpolished *** performance of the chemical vapor deposition(CVD)-W exposed to deuterium(D)plasma and fission neutron were also ***,the practicality of preparation of large-scale W-based PFM by this technique is also *** paper gives a short overview on the recent research and development status of the thick W co.ting prepared by APCVD at xiamen tungsten co.,Ltd and Southwestern Institute of Physics for using as PFM and PFC in fusion devices.

关键词： tungsten co.tings Chemical vapor deposition Plasma-facing materials Plasma-facing co.ponent

Development of manufacturing technology on WC-co.hardmetals

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tungsten 2019年第3期1卷 198-212页

作者： Hongbo Nie Taiquan Zhang School of Materials Science and Engineering Baise UniversityBaise 533000China China National R&D Center for tungsten Technology Xiamen Tungsten Co.LTD.Xiamen 361009China

Hardmetals are tungsten carbide(WC)-based co.posites,which are made of WC as a hard phase and transition metals such as co.Fe,or/and Ni as ductile binder *** properties can be mainly tailored through the grain sizes of the sintered carbides and the amount of metallic *** successful tool materials,hardmetals are widely applied in metal cutting,wear applications,chipless forming,stoneworking,wood,and plastic *** 2017,about two-thirds of tungsten co.sumption(including recycled materials)were produced for hardmetals in the *** paper briefly introduces the development of manufacturing technology on WC-co.hardmetals from three aspects:powder preparation,bulk densifica-tion,and performance *** special WC-co.hardmetals are also described:co.alt-enrichment zone(CEZ)hardmetals,and binderless ***,the development prospects for manufacturing techniques of hardmetals are also presented in the end.

关键词： Hardmetal Ultrafine WC powder Ultrafine co.alt powder Extrusion press Liquid sintering co.alt-enrichment zone hardmetal Binderless hardmetal

Influence of recrystallization on tungsten divertor monoblock under high heat flux

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tungsten 2022年第3期4卷 194-202页

作者： Yu-Zhong Jin Xiang Liu You-Yun Lian Jiu-Peng Song Southwestern Institute of Physics Chengdu610225China xiamen tungsten co.Ltd Xiamen361021China

Extremely high heat flux reaching 20 MW·m^(−2) can be foreseen for the future fusion *** high heat flux would induce recrystallization of tungsten(W)material,leading to significant strength loss of tungsten material and increment of ductility at high temperature,in particular when the temperature is much higher than its ductile-to-brittle transition temperature(DBTT).In this paper,an International Thermonuclear Experimental Reactor(ITER)-like tungsten divertor monoblock is modeled,and benchmark has been done first to get co.sistent results with ***,the monoblock structure has been optimized in order to get a lowest possible temperature and stress during heating and co.ling phase separately co.pared to the baseline *** analysis of two kinds of states:stress-relieved tungsten and recrystallized tungsten using finite element method has been performed,aiming at finding out the recrystallization impact on the mechanical behavior of tungsten in divertor monoblock under cyclic high heat *** due to progressive deformation and time-independent fatigue lifetime of these two states of tungsten have been assessed and co.pared acco.ding to criteria The Structural Design Criteria for ITER In-vessel ***,the impact of different material recrystallization temperature on mechanical behavior has been explored under stationary heat *** result shows that after recrystallization,thermal stress of tungsten material can be released by the larger plastic deformation co.pared to the stress-relieved ***,it is easier for recrystallized tungsten to get damaged due to progressive deformation as well as fatigue under 20 MW·m^(−2) cyclic heat flux than stress-relieved tungsten because of its relatively lower yield strength and larger plastic strain,which would cause low-cycle strain ***,tungsten with lower recrystallization temperature distorts more seriously,and therefore,it can be predicted the cracks would

关键词： tungsten Finite element method Divertor High heat flux Thermal stress

Jet formation and penetration performance of a double-layer charge liner with chemically-deposited tungsten as the inner liner

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Defence Technology（防务技术） 2024年第3期33卷 374-385页

作者： Bihui Hong Wenbin Li Yiming Li Zhiwei Guo Binyou Yan Ministerial Key Laboratory of ZNDY Nanjing University of Science and TechnologyNanjing 210094China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China xiamen tungsten co. Ltd.Xiamen 361004China

This paper proposes a type of double-layer charge liner fabricated using chemical vapor deposition(CVD)that has tungsten as its inner *** feasibility of this design was evaluated through penetration ***-layer charge liners were fabricated by using CVD to deposit tungsten layers on the inner surfaces of pure T2 co.per *** microstructures of the tungsten layers were analyzed using a scanning electron microsco.e(SEM).The feasibility analysis was carried out by pulsed X-rays,slug-retrieval test and static penetration *** shaped charge jet forming and penetration law of inner tungsten-co.ted double-layer liner were studied by numerical simulation *** results showed that the double-layer liners co.ld form well-shaped *** errors between the X-ray test results and the numerical results were within 11.07%.A slug-retrieval test was found that the retrieved slug was similar to a numerically simulated *** with the traditional pure co.per shaped charge jet,the penetration depth of the double-layer shaped charge liner increased by 11.4% and>10.8% *** summary,the test results are good,and the numerical simulation is in good agreement with the test,which verified the feasibility of using the CVD method to fabricate double-layer charge liners with a high-density and high-strength refractory metal as the inner liner.

关键词： Shaped charge Chemical vapor deposition tungsten Double-layer charge liner X-ray Penetration

Strong Tracking Particle Filter Based on the Chi-Square Test for Indoor Positioning

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co.puter Modeling in Engineering & Sciences 2023年第8期136卷 1441-1455页

作者： Lingwu Qian Jianxiang Li Qi Tang Mengfei Liu Bingjie Yuan Guoli Ji Department of Automation Xiamen UniversityXiamen361102China xiamen Tobacco.Industry co. Ltd.Xiamen361022China

In recent years,a number of wireless indoor positioning(WIP),such as Bluetooth,Wi-Fi,and Ultra-Wideband(UWB)technologies,are ***,the indoor environment is co.plex and ***,pillars,and even pedestrians may block wireless signals and produce non-line-of-sight(NLOS)deviations,resulting in decreased positioning accuracy and the inability to provide people with real-time co.tinuous indoor *** work proposed a strong tracking particle filter based on the chi-square test(SPFC)for indoor *** can fuse indoor wireless signals and the information of the inertial sensing unit(IMU)in the smartphone and detect the NLOS deviation through the chi-square test to avoid the influence of the NLOS deviation on the final positioning *** experiment results show that the proposed SPFC can reduce the positioning error by 15.1%and 12.3% co.pared with existing fusion positioning systems in the LOS and NLOS environment.

关键词： NLOS strong tracking filter particle filter CST pedestrian dead reckoning indoor positioning

Grain size effect on wear resistance of WC-co.cemented carbides under different tribological co.ditions

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Journal of Materials Science & Technology 2019年第11期35卷 2435-2446页

作者： Haibin Wang Mark Gee Qingfan Qiu Hannah Zhang Xuemei Liu Hongbo Nie Xiaoyan Song Zuoren Nie co.lege of Materials Science and Engineering Key Laboratory of Advanced Functional MaterialsEducation Ministry of ChinaBeijing University of TechnologyBeijing 100124China National Physical Laboratory Hampton RoadTeddingtonTW110LWUK xiamen tungsten co. Ltd.Xiamen 361009China

The grain-size dependence of wear resistance of WC-co.cemented carbides(with mean WC grain sizes of 2.2μm,1.6μm,0.8μm and 0.4μm,respectively)was investigated under different tribological *** results showed that the grain size had opposite effects on wear resistance of the cemented carbides in dry sliding wear and microabrasion *** the former co.dition,with decrease of WC grain size hence the increase of hardness,plastic deformation,fracture,fragmentation and oxidation were all mitigated,leading to a drastic decrease in the wear *** the latter co.dition,pull-out of WC grains after co.removal dominated the wear,so that the hardness of cemented carbide was not a co.e *** a result,the wear resistance of the cemented carbide generally showed a decreasing trend with decrease of the grain size,except for a slight increase in the ultrafine-grained cemented ***-pass scratching of the cemented carbides under various loads indicated the same failure mechanism as that in the sliding wear ***,the reasons for severe surface oxidation of the co.rse-grained cemented carbides were disclosed.

关键词： Cemented carbide Grain size Fracture Surface oxidation Grain pull-out Wear resistance

Advances in the early diagnosis of hepatocellular carcinoma

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Genes & Diseases 2020年第3期7卷 308-319页

作者： Weiyi Wang Chao Wei xiamen Amplly Bio-engineering co. LtdXiamenPR China

Hepatocellular carcinoma(HCC)is one of the most prevalent cancers *** co.trast to the declining death rates observed for all other co.mon cancers such as breast,lung,and prostate cancers,the death rates for HCC co.tinue to increase by^2e3%per year because HCC is frequently diagnosed late and there is no curative therapy for an advanced *** early diagnosis of HCC is truly a big *** the past years,the early diagnosis of HCC has relied on surveillance with ultrasonography(US)and serological assessments of alpha-fetoprotein(AFP).However,the specificity and sensitivity of US/AFP is not satisfactory enough to detect early onset *** technological advancements offer hope for early HCC ***,we review the progress made in HCC diagnostics,with a focus on emerging imaging techniques and biomarkers for early disease diagnosis.

关键词： Biomarker Early diagnosis Hepatocellular carcinoma Imaging Liquid biopsy

Impacts of hydrogen annealing on the carrier lifetimes in p-type 4H-SiC after thermal oxidation

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Chinese Physics B 2023年第6期32卷 60-65页

作者：张锐军洪荣墩韩景瑞丁雄杰李锡光蔡加法陈厦平傅德颐林鼎渠张明昆吴少雄张宇宁吴正云张峰 Department of physics Xiamen universityXiamen 361005China Guangdong Tianyu Semico.ductor co. LtdDongguan 523808China

Thermal oxidation and hydrogen annealing were applied on a 100μm thick Al-doped p-type 4H-Si C epitaxial wafer to modulate the minority carrier lifetime,which was investigated by microwave photoco.ductive decay(μ-PCD).The minority carrier lifetime decreased after each thermal *** the co.trary,with the hydrogen annealing time increasing to3 hours,the minority carrier lifetime increased from 1.1μs(as-grown)to 3.14μs and then saturated after the annealing time reached 4 *** increase of surface roughness from 0.236 nm to 0.316 nm may also be one of the reasons for limiting the further improvement of the minority carrier ***,the whole wafer mappings of minority carrier lifetimes before and after hydrogen annealing were measured and *** average minority carrier lifetime was up to 1.94μs and non-uniformity of carrier lifetime reached 38%after 4-hour hydrogen *** increasing minority carrier lifetimes co.ld be attributed to the double mechanisms of excess carbon atoms diffusion caused by selective etching of Si atoms and passivation of deep-level defects by hydrogen atoms.

关键词： 4H-SiC carrier lifetime hydrogen annealing

Long-term Field co.rosion Monitoring in Supporting Structures of China xiamen Xiangan Subsea Tunnel

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Acta Metallurgica Sinica(English Letters) 2017年第4期30卷 399-408页

作者： Chao-Yang Gong Xiao-Yong He Yong-Wei Li Si-Zhe He Xuan Cheng Liu-Ying Huang Ying Zhang Jiu-Bin Chen Shao-Hui Xu Jian-Bin Zhang Chao Zeng Department of Materials Science and Engineering College of Materials Xiamen University Xiamen 361005 China Fujian Key Laboratory of Advanced Materials (xiamen University) Xiamen 361005 China xiamen Road and Bridge co.struction Group co. LtdXiamen 361000 China

xiamen Xiangan Subsea Tunnel is the first undersea tunnel co.structed in China. It has beco.e the major undersea pathway co.necting xiamen Island and Xiangan District since its operation in 2010. The total length is 6.05 km with the undersea length of 4.2 km. In an effort to onsite-monitor reinforcement co.rosion in co.crete structures, the co.mercially available co.roWatch multiprobe sensors and ERE-20 reference electrodes were pre-embedded in the selected locations and positions of supporting structures during the tunnel co.structions. The real-time data have been co.lected annually by onsite measurements for 6 years. In this paper, the feasibility of the onsite co.rosion monitoring system and suitability of the measured parameters including co.rosion current, potential and temperature are discussed based on the preliminary results. The measured typical cyclic-type variations in co.rosion current and temperature with monitoring time might be related to the seasonal changes during the annual routine measurements. The widely scattered co.rosion potentials that are fluctuated co.plicatedly reflected localized differences in the vicinity of rebar and co.crete. These findings, along with the progressively ongoing research, will provide valuable information in structural durability for service life prediction of reinforced co.crete structures exposed to marine environments.

关键词： co.rosion monitor co.rosion current co.rosion behavior Sensors