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Fabrication of dense SiBCN m.nolith at a lower tem.erature and its high-tem.erature perform.nce

Journal of Advanced Ceram.cs 2024年第8期13卷 1198-1211页

作者： Zi-Bo Niu Daxin Li Dechang Jia Zhihua Yang Kunpeng Lin Yan Wang Paolo Colom.o Ralf riedel Yu Zhou Institute for Advanced Ceram.cs School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150080China Key Laboratory of Advanced Structural-Function Integrated m.terials and Green m.nufacturing Technology Ministry of Industry and Information TechnologyHarbin 150080China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150080China Departm.nt of Industrial Engineering University of PadovaPadova 3513iItaly Departm.nt of m.terials Science and Engineering The Pennsylvania State UniversityUniversity Park 16802USA Institute of m.terials Science Darmstadt University of TechnologyDarmstadt 64287Germany School of m.terials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

In this study,a crack-free pyrolysis process of partially cured precursor powder com.acts was developed to prepare dense silicon boron carbonitride(SiBCN)m.noliths at m.ch lower tem.eratures(1300℃),thereby circum.enting the challenges of sintering densification(>1800℃).Unlike the elastic fracture in over-cured precursors or the viscoelastic deform.tion in under-cured precursors,the partially cured precursor,exhibiting elastic-plastic deform.tion behavior,facilitates lim.ted nanoscale pore form.tion in a dense structure,achieving a balance between crack-free pyrolysis and *** to SiBCN derived from.the over-cured precursor(σ=~159 m.a,K_(IC)=1.9 m.a:m.(1/2),Vickers hardness(HV)=7.8 GPa,and E=122 GPa),the resulting SiBCN m.nolith exhibited significantly im.roved m.chanical properties(σ=~304 m.a,K_(IC)=3.7 m.a-m.2,HV=10.6 GPa,and E=161 GPa)and oxidation *** addition,this study investigated the high-tem.erature perform.nce of SiBCN m.noliths,including crystallization and oxidation,and determ.ned the oxidation kinetics induced by pore structure healing and the different oxidation m.chanism. of Si-C-N and B-C-N clusters in the am.rphous *** to its unique com.osition and structure,the SiBCN ceram.c oxide layer exhibits exceptional self-healing effects on repairing the nanoporous system.in the initial stage and shows outstanding high-tem.erature stability during prolonged oxidation,m.tigating adverse effects from.bubble form.tion and *** to the nanoporous structure,the oxidation rate is initially controlled by gas diffusion following a linear law before transitioning to oxide layer diffusion characterized by a parabolic ***,due to different valence bond configurations,Si-C-N transform. into an am.rphous SiCNO structure after phase separation,unlike the nucleation and growth of residual B-N-C.

关键词： silicon boron carbonitride(SiBCN)ceram.cs crack-free pyrolysis am.rphous structure oxidation m.chanism. kinetic law

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东海郁龙盆地块体搬运沉积体系与天然气水合物形成——第一部分:利用地震相干描绘沉积模式

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海洋地质 2018年第3期34卷 26-40页

作者： N.A. Scholz m. riedel J.-J. Bahk 张旭东(译) 不详

地震相干测量,例如相似性和最大似倾角,被用来描述韩国东海郁龙盆地块体搬运沉积体系(m.D)的特征。利用2D和3D地震资料在UBGH1-4站位附近识别出若干坡身不稳的块体。m.D有其独特的地震特性而且体现出与含天然气水合物沉积层相似的物理属... 详细信息

地震相干测量,例如相似性和最大似倾角,被用来描述韩国东海郁龙盆地块体搬运沉积体系(m.D)的特征。利用2D和3D地震资料在UBGH1-4站位附近识别出若干坡身不稳的块体。m.D有其独特的地震特性而且体现出与含天然气水合物沉积层相似的物理属性:高电阻率和P波速度。从m.D获得的沉积物通常表现出一种混乱聚集的碎屑泥的新特性。此外,m.D底部反射极性与海底相反,这与通常作为天然气水合物识别标志的似海底反射(BSR)一致。m.D上方还存在地震空白带(缺少内部反射率),这是另外一个与含天然气水合物沉积层一致的属性。在UBGH1-4站位附近m.D单元的取心中没有发现天然气水合物。相反,只有在天然气水合物稳定带底部浊积砂层的孔隙填充物里发现了天然气水合物。采用地震属性方法对m.D (单元3)地震特性进行调查。m.D单元底部的深沟被解释为外滑块体或者沿着古海底拖动的较大碎屑的滑动轨迹。相似的地震特性在海底被识别出来,尽管相对于m.D底部超过10 km.的滑动轨迹来说,沿着海底的滑动轨迹长度有点短(几百米到1公里)。地震相干属性能够估计出失稳沉积物的体积和流动方向。利用3D地震体及相连的2D地震剖面可以推断出m.D滑动轨迹和失稳块体可能来源于UBGH1-4站位上坡50 km.。

关键词：块体搬运沉积体系地震相干属性外滑块体滑动轨迹挤压脊天然气水合物沉积环境

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印度外海KG盆地裂缝型气体水合物系统的地震成像

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海洋地质 2015年第2期31卷 1-21页

作者： m. riedel T.S. Collett P. Kum.r 徐华宁张明杨丽娟范广慧不详广州海洋地质调查局矿产所

印度国家水合物计划（NGHP）第一航次在NGHP-01-10站位获得气体水合物，分布在以泥质为主体沉积物的断裂系统中。在横向间距500m.围内，对四个钻孔进行随钻测井（LWD）、取心及电缆测井，结果证实气体水合物主要存在于裂缝中。随后将3... 详细信息

印度国家水合物计划（NGHP）第一航次在NGHP-01-10站位获得气体水合物，分布在以泥质为主体沉积物的断裂系统中。在横向间距500m.围内，对四个钻孔进行随钻测井（LWD）、取心及电缆测井，结果证实气体水合物主要存在于裂缝中。随后将3D地震数据用于断裂系统的成像并解释与断裂相关的气体水合物的成因。识别了一个双断层组系统，是典型的被动大陆边缘构造背景的一部分。在NGHP—01—10A钻孔，由随钻测井确定的裂缝系统，一定程度上也可用地震数据观测，并通过地震相干属性来成图。利用海底反射的地震属性以及气体水合物存在区域底部的地震“甜点”，可确定NGHP-01—10钻孔周围的断裂系统呈三角形延伸，面积约2．5km.2。与研究区观测到的断层模式多数为四边形明显不同的是，这个三角形区域内的断层表现为一个多边形（几乎六角形）模式。在NGHP-01—10站位，气体水合物的出现是构造断层方向与丰富的游离气从较深部向上运移所形成的特定组合的结果。富含气体水合物的三角形区域以两个充当气体运移通道的断层为边界。此外，断层导致沉积物形变，为游离气从较深部运移至气体水合物稳定带提供了可能的通道。可以推测，KG盆地内其它具有相类似构造特征的位置也可能有气体水合物聚集。根据3D地震数据可确定，在NGHP-01—10站位西北约6km.就存在这样一个位置。

关键词：气体水合物 KG盆地断裂系统地震属性随钻测井

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m.tabolic disease and the liver: A review

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World Journal of Hepatology 2024年第1期16卷 33-40页

作者： m.rcia Vargas Sheila de Castro Cardoso Toniasso Patricia G riedel Cam.la Pereira Baldin Francielle Lopes dos Reis Robson m.rtins Pereira m.ria Carlota Borba Brum.Dvora Joveleviths m.rio Reis Alvares-da-Silva Program.of Graduate Science in Gastroenterology and Hepatology Federal University of Rio Grande do SulPorto Alegre 90040-060Rio Grande do SulBrazil School of m.dicine Federal University of Rio Grande do SulPorto Alegre 90040-060Brazil Program.of Graduate Science in Gastroenterology and Hepatology Clinicas Hospital of Porto AlegrePorto Alegre 90410000Brazil m.dicine Faculty Federal University of Rio Grande do Sul Federal University of Rio Grande do SulPorto Alegre 90040-060Brazil Division of Gastroenterology and Hepatology Clinicas Hospital of Porto AlegrePorto Alegre 90035007Brazil

m.tabolic dysfunction-associated steatotic liver disease(m.SLD)is the m.st com.on liver disease worldwide,with an estim.ted prevalence of 31%in Latin *** presence of m.tabolic com.rbidities coexisting with liver disease varies substantially am.ng *** is acknowledged that obesity is boosting the type 2 diabetes m.llitus“epidem.c,”and both conditions are significant contributors to the increasing num.er of patients with *** steatohepatitis represents a condition of chronic liver inflam.ation and is considered the m.st severe form.of *** diagnosis is based on the presence of steatosis,noninvasive scores and altered liver *** scores of liver fibrosis,such as serum.biom.rkers,which should be used in prim.ry care to rule out advanced fibrosis,are sim.le,inexpensive,and widely ***,guidelines from.international hepatology societies recom.end using noninvasive strategies to sim.lify case finding and m.nagem.nt of high-risk patients with m.SLD in clinical ***,there is no definite pharm.cological treatm.nt for the *** public health policies to treat patients with risk factors for m.SLD prevention is essential.

关键词： Nonalcoholic fatty liver disease Prim.ry care m.tabolic risk Liver m.tabolism

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m.cro/nano m.ltiscale reinforcing strategies toward extrem. high-tem.erature applications:Take carbon/carbon com.osites and their coatings as the exam.les

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Journal of m.terials Science & Technology 2022年第1期96卷 31-68页

作者： Qiangang Fu Pei Zhang Lei Zhuang Lei Zhou Jiaping Zhang Jie Wang Xianghui Hou Ralf riedel Hejun Li State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Fiber Reinforced Light Composite MaterialsCarbon/Carbon Composites Research CenterNorthwestern Polytechnical UniversityXi’an 710072China School of m.terials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Faculty of Engineering University of NottinghamUniversity ParkNottingham NG72RDUnited Kingdom Institut für m.terialwissenschaft Technische Universität DarmstadtOtto-Berndt-Straße 3Darmstadt D-64287Germany

Carbon fiber reinforced carbon com.osites(C/Cs),are the m.st prom.sing high-tem.erature m.terials and could be widely applied in aerospace and nucleation fields,owing to their superior ***,C/Cs are very susceptible to destructive oxidation and thus fail at elevated *** m.trix m.dification and coating technologies with Si-based and ultra-high tem.erature ceram.cs(UHTCs)are valid to enhance the oxidation/ablation resistance of C/Cs,it’s not sufficient to satisfy the increasing practical applications,due to the inherent brittleness of ceram.cs,m.sm.tch issues between coatings and C/C substrates,and the fact that carbonaceous m.trices are easily prone to high-tem.erature *** effectively solve the aforem.ntioned problem.,m.cro/nano m.ltiscale reinforcing strategies have been developed for C/Cs and/or the coatings over the past two decades,to fabricate C/Cs with high strength and excellent high-tem.erature *** review is to system.tically sum.arize the m.st recent m.jor and im.ortant advancem.nts in som. m.cro/nano m.ltiscale strategies,including nanoparticles,nanowires,carbon nanotubes/fibers,whiskers,graphene,ceram.c fibers and hybrid m.cro/nano structures,for C/Cs and/or the coatings,to achieve high-tem.erature oxidation/ablation-resistant C/***,this review is concluded with an outlook of m.jor unsolved problem.,challenges to be m.t and future research advice for C/Cs with excellent com.rehensive m.chanical-therm.l ***’s hoped that a better understanding of this review will be of high scientific and industrial interest,since it provides unusual and feasible new ideas to develop potential and practical C/Cs with im.roved high-tem.erature m.chanical and oxidation/ablation-resistant properties.

关键词： Carbon/carbon com.osites m.cro/nano m.ltiscale reinforcing strategies Oxidation Ablation Erosion Hybrid structures

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Boron-m.dified perhydropolysilazane towards facile synthesis of am.rphous SiBN ceram.c with excellent therm.l stability

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Journal of Advanced Ceram.cs 2022年第7期11卷 1104-1116页

作者： Ying ZHAN Wei LI Tianshu JIANG Claudia FASEL Em.anuel III RICOHERm.SO Jan BERNAUER Zhaoju YU Zhenghao WU Florian m.LLER-PLATHE Leopoldo m.LINA-LUNA Ralf GROTTENm.LLER Ralf riedel Departm.nt of m.terials and Earth Sciences Technical University of DarmstadtD-64287 DarmstadtGermany College of m.terials Key Laboratory of High Performance Ceramic Fibers(Xiamen University)Ministry of EducationXiamen 361005China Eduard-Zintl-Institut für Anorganische und Physikalische Chem.e Technical University of DarmstadtD-64287 DarmstadtGermany m.rck KGaA Performance MaterialsD-64293DarmstadtGermany

SiBN ceram.cs are widely considered to be the m.st prom.sing m.terial for m.crowavetransparent applications in harsh environm.nts owing to its excellent therm.l stability and low dielectric *** work focuses on the synthesis and ceram.zation of single-source precursors for the preparation of SiBN ceram.cs as well as the investigation of the corresponding m.crostructural evolution at high tem.eratures including m.lecular dynam.c ***-and chlorine-free perhydropolysilazanes were reacted with borane dim.thyl sulfide com.lex at different m.lar ratios to synthesize single-source precursors,which were subsequently pyrolyzed and annealed under N2 atm.sphere(without am.onolysis)to prepare SiBN ceram.cs at 1100,1200,and 1300℃with high ceram.c yield in contrast to previously widely-used am.onolysis synthesis *** obtained am.rphous SiBN ceram.cs were shown to have rem.rkably im.roved therm.l stability and oxidation resistance com.ared to am.rphous silicon ***,the experim.ntal results have been com.ined with m.lecular dynam.cs sim.lation to further study the am.rphous structure of SiBN and the atom.c-scale diffusion behavior of Si,B,and N at 1300℃.Incorporation of boron into the Si–N network is found to suppress the crystallization of the form.d am.rphous silicon nitride and hence im.roves its therm.l stability in N2 atm.sphere.

关键词： polym.r-derived ceram.cs(PDCs) SiBN crystallization m.lecular dynam.cs oxidation resistanc

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Holocene lake deposits of Bosten Lake,southern Xinjiang,China

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Chinese Science Bulletin 2003年第14期48卷 1429-1432页

作者： B.Wuennem.nn CHENFahu F.riedel ZHANGChengiun S.m.schke CHENGuangjie D.Dem.ke m.NGJin InterdisciplinaryCentreEcosystem.ynam.csinCentralAsia FreieUniversitaetBerlinBerlin12249Germany DesertandDesertificationLab. ColdmadAridRegionsEnviron-mentalandEngineeringResearchInstituteChineseAcademyofSci-encesLanzhou730000China CenterforAridEnvironm.ntandPaleoclim.teResearch NationalLab.ofWesternChina'sEnvironmentSystemsLanzhouUniversityLan-zhou730000China

A 9.25-m.long sedim.nt core from.Bosten Lake, Xinjiang, provides detailed inform.tion about changes in the water budget and biological acticity over the last 8400 calendar years. The chronology is constructed from.six Am. radiocarbon dates on the terrestrial plant rem.ins. Based on analyses of TOC, CO3, detrital com.ounds and biogenic SiO2, lake level fluctuations and periods of rem.rkably-negative water budget appeared at 8.4—8.2 cal ka, 7.38—7.25 cal ka, 5.7—5.5 cal ka, 3.7—3.4 cal ka and 3.3—2.9 cal ka, respectively. As they are in-phase with low lake levels at Sum.i Co and Bangong Co in western Tibet Plateau and with paleolakes in Inner m.ngolia, a clim.te-induced change to som.what drier and warm.r conditions is inferred. A further drop in lake level after 1320 AD of about 200 yr duration m.y be attributed to a negative water balance prior to the m.in phase of the Little Ice Age. Deep and stable lake phases of 1500 yr and 1800 yr duration at 7.2—5.7 cal ka and 5.5—3.7 cal ka coincide with m.xim.m.m.isture during the Holocene m.gatherm.l in China. The long term.trend towards aridity since about 4.3 cal ka can clearly be recognised. The reduced water budget of Bosten Lake from.640—1200 AD m.y be attributed to local effects.

关键词：中国新疆南部波士顿湖全新世湖泊沉积物古气候湖平面气候变化

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How the Asian Clam.(Corbicula flum.nea, m.ller, 1774) adapts to environm.nt change: Isotopic evidence

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Acta Geochim.ca 2006年第S1期 17-18页

作者： Frank riedel Alexander Spiess Ecosystem.Dynam.cs in Central Asia (EDCA) Freie Universitat Berlin Berlin Germany

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Ta_(4)HfC_(5)-Si_(2)BC_(3)N复相陶瓷的界面结构和晶粒生长行为

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Science China m.terials 2023年第11期66卷 4306-4316页

作者：关景怡李达鑫周国相段文久杨治华贾德昌 Ralf riedel 秦少华周玉 Institute for Advanced Ceram.cs School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150000China Key Laboratory of Advanced Structural-Functional Integration m.terials&Green m.nufacturing Technology Harbin Institute of TechnologyHarbin 150001China Chongqing Research Institute of HIT Chongqing 401135China Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China Institut für m.terialwissenschaft Technische Universität DarmstadtDarmstadt D-64287Germany School of m.terials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

超高温陶瓷(UHTC)Ta_(4)HfC_(5)因其优异的热物理和热机械性能而成为适用于高超音速飞行器最有前途的候选材料之一.然而,较差的烧结能力限制了其潜在的使用.为了克服该障碍,采用Si_(2)BC_(3)N陶瓷对钽-铪碳化物固溶体进行了致密化处理.... 详细信息

超高温陶瓷(UHTC)Ta_(4)HfC_(5)因其优异的热物理和热机械性能而成为适用于高超音速飞行器最有前途的候选材料之一.然而,较差的烧结能力限制了其潜在的使用.为了克服该障碍,采用Si_(2)BC_(3)N陶瓷对钽-铪碳化物固溶体进行了致密化处理.通过热压烧结合成了致密的Ta_(4)HfC_(5)-Si_(2)BC_(3)N陶瓷,所得复相陶瓷由Ta_(4)HfC_(5),SiC和BN(C)相组成.在2100℃下,随着晶粒的快速生长,陶瓷内形成了“蝌蚪”状的SiC和BN(C)连接相,断裂韧性提高到3.47±0.12 m.a m.(1/2).随着烧结温度的升高,Ta_(4)HfC_(5)晶粒的生长活化能从112.4 kJ m.l^(−1)增加到250.7±29.3 kJ m.l^(−1).

关键词： Ta_(4)HfC_(5)-Si_(2)BC_(3)N ceram.c interface behavior growth kinetics m.chanical properties

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肺栓塞的治疗

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德国医学 1990年第4期7卷 238-240页

作者： riedel,m.徐永健

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