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MICROSTRUCTURE AND MECHANICAL PROPERTIES OF(Nb,Ti)C-NICKEL BASE SUPERALLOY

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中国有色金属学会会刊：英文版 1998年第2期8卷 98-101页

作者： Cai, Kefeng nan, cewen Min, Xinmin Wuhan Univ of Technology Wuhan China

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关键词： mechanical properties microstructure titanium carbide

Stretch-shear mode laminated metglas/Pb(Zr,Ti)O3/metglas composite with an enhanced magnetoelectric effect

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Science Bulletin 2017年第6期62卷 388-390页

作者： Chengzhou Xin Jiannan Ma Jing Ma cewen nan State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China

Magnetoelectric(ME)composites have recently attracted an ever-increasing interest and provoked a great number of research activities,driven by the potential applications in novel multifunctional devices,such as sensors and transducers[1].Direct ME effect,which describe the appearance of an electric polarization P upon applying a magnetic field H,is usually evaluated by the

关键词： mode Zr,Ti)O3/metglas composite with an enhanced magnetoelectric effect PZT ME Ti

Thermoelectric transport properties of Bi CuSeO with embedded La0.8Sr_(0.2)CoO_3 nanoinclusions

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Science China(Technological Sciences) 2016年第7期59卷 1036-1041页

作者： LIU YaoChun LAN JinLe ZHANG BoPing LIN YuanHua nan cewen School of Materials Science and Engineering University of Science and Technology Beijing State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua University State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology

The efficiency-upgrading role that La0.8Sr0.2CoO3 plays in the thermoelectric properties of Bi Cu Se O（BCSO） has been studied. LSCO was introduced into BCSO, increasing the electrical conductivity from 3.3 to 52.3 S cm^-1 at 303 K, from 35.8 to 97.3 S cm^-1 at 873 K; respectively. The Seebeck coefficient of all composites still holds around or more than 200 μV/K. Based on the enhanced electrical conductivity and high Seebeck coefficient, the power factor is enhanced by approximately 35%, with the best sample reaching a maximum value of 476.7 μ Wm^-1 K^-2 at 873 K. The lattice thermal conductivity of the nanocomposites is reduced as LSCO content increases from 15 vol% to 30 vol% due to the phonon scattering by nanoparticles and grain boundaries, resulting in a significant reduction in total thermal conductivity. In short, the enhanced thermoelectric figure of merit of 0.67 at 873 K for the sample containing 20 vol% LSCO as compared to 0.53 for the pure sample; announces the promising effect of LSCO on improving thermoelectric properties of Bi Cu Se O.

关键词： Bi Cu Se O La0.8Sr0.2CoO3 thermoelectric composite

Preparation of In_2O_3-Sr_2RuErO_6 Composite Ceramics by the Spark Plasma Sintering and Their Thermoelectric Performance

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Journal of Materials Science & Technology 2011年第12期27卷 1165-1168页

作者： Bo Cheng Yuanhua Lin Jinle Lan Yong Liu cewen nan State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing 100084 China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 Ch.ina

Inl.9aZn0.03Ge0.0303 and Sr2RuEr06 composite ceramics have been prepared by the spark plasma sintering （SPS） technique. Microstructure studies show that the Sr2RuErO6 phases are randomly dispersed in the In1.94Zn0.03Ge0.03O3 matrix. The results show that the Seebeck coefficient increases with increasing the amount of Sr2RuErO6, while the thermal conductivity of the composite samples is lower than that of the Inl.9aZno.03Ge0.03O3 ceramic. The thermal conductivity of the 7 vol.% Sr2RuErO6 sample can decrease to 2.15 W.m-1.K-1 at 973 K, and the evaluated maximum ZT value is 0.23 for 3 vol.% Sr2RuErO6 samples at 973 K, which makes them promising materials for the thermoelectric devices.

关键词： Indium oxide Double perovskite Thermoelectric performance Composite

Strain-induced modulation of magnetic anisotropy in Co/BaTiO_3 composite

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Chinese Science Bulletin 2014年第36期59卷 5191-5193页

作者： Li Shu Ya Gao cewen nan School of Materials Science and Engineering State Key Laboratory of New Ceramics and Fine Processing Tsinghua University

A uniaxial magnetic anisotropy Co film was grown on a single-crystal Ba Ti O3(BTO) substrate. The strain yielded by the voltage-induced ferroelastic domain switching in the BTO substrate was recorded by atomic force microscope and modulated the magnetism of the Co film. The manipulation of the magnetism of the Co film is experimentally demonstrated by voltage dependence of magnetic hysteresis loops measured via magneto-optic Kerr effect.

关键词：磁各向异性应变诱导调制钛酸钡电压依赖性复合原子力显微镜磁光克尔效应

Self-biased magnetoelectric effect in(Pb, Zr)TiO_3/metglas laminates by annealing method

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Science Bulletin 2016年第5期61卷 378-382页

作者： Jiannan Ma Chengzhou Xin Jing Ma Qiming Zhang cewen nan School of Materials Science and Engineering State Key Laboratory of New Ceramics and Fine Processing Tsinghua University Department of Electrical Engineering and Materials Research Institute Pennsylvania State University University Park

Fe BSi C metglas was annealed at an optimized condition（350 °C, 5 min） to achieve the mixed phases with pristine amorphous phase and crystallization *** such annealed metglas, a self-biased magnetoelectric（ME） laminate of metglas/Pb（Zr, Ti）O3/metglas was fabricated. Without any external magnetic field, the composite exhibits the ME coefficient aE31 of 103 m V/（cm Oe） at1 k Hz and 15.5 V/（cm Oe） at electromechanical resonance frequency. The induced ME voltage shows a good linear relation to the applied AC magnetic field with amplitude as low as 10-7T at 1 k Hz. It is expected that such self-biased ME composites provide a practical application of economical and compact magnetic sensors.

关键词： Magnetoelectric Self-bias Metglas Annealing

Oxidation Behaviors of C-ZrB_2-SiC Composite at 2100℃ in Air and O_2

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Journal of Materials Science & Technology 2014年第12期30卷 1223-1229页

作者： Zhongwei Zhang cewen nan Jingjun Xu Zenghua Gao Meishuan Li Junshan Wang State Key Laboratory of New Ceramics & Fine Processing Department of Materials Science and Engineering Tsinghua University Science and Technology on Advanced Functional Composites Laboratory Aerospace Research Institute of Materials and Processing Technology Institute of Metal Research Chinese Academy of Sciences

The oxidation behaviors of graphite and ZrB2-SiC modified graphite composite were investigated at 2100℃ in1X105 Pa air and 0.2X105 Pa O2. The oxidation tests were conducted in an induction heating furnace. The oxidation of these two materials followed the linear rate law. The determined radius loss rates of graphite and C-ZrB2-Si C at 2100℃ were 2.18X10-2and 1.05X10-2%/s in 1X105 Pa air, and 3.23X10 2 and 2.21X10 2%/s in 0.2X105 Pa O2, respectively. The incorporation of ZrB2 and SiC decreased remarkably the oxidation rate of graphite because the oxide scale formed on the sample surface during oxidation helps in reducing the exposed surface area of the underneath substrate. In two different atmospheres with the same oxygen partial pressure, both graphite and ZrB2-SiC experienced more severe oxidation at 2100℃ in0.2X105 Pa O2than in 1X105 Pa air. The oxidation rate-controlling step for graphite and ZrB2-SiC was proposed to be the inward diffusion of oxygen through the boundary layer and through the pores in the oxide scale, respectively. A model based on diffusion theory was established to discuss the effect of the total gas pressure on their oxidation behaviors.

关键词： Graphite-based composite Ceramic particles Ultra-high temperature oxidation Oxide scale Oxidation mechanism

Thermoelectric thin films:Promising strategies and related mechanism on boosting energy conversion performance

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Journal of Materiomics 2020年第3期6卷 494-512页

作者： Xuxuan Chen Zhifang Zhou Yuan-Hua Lin cewen nan State Key of Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084PR China

Thermoelectrics can be capable of direct and reversible conversion between heat and *** dimensional thermoelectric materials,especially two dimensional(2D)thin films,have been considered as a breakthrough to decouple the correlations between electronic and thermal transport,contributing to the optimization of thermoelectric *** the past few decades,some effective strategies combined with physical concepts like quantum confinement effect,energy filtering effect,band structure tuning and interface engineering are introduced to design high performance *** a thorough understanding the underlyingmechanisms is essential to develop thermoelectric ***,our review summarizes the major strategies that can be utilized in thermoelectric thin films,including fabrication of superlattice structure,formation of two-dimensional electron gas(2DEG)system,orientation regulation,strain engineering and magnetic manipulation,from the aspects of deep mechanisms analyses,recent progress and prospects,inspiring significant improvement of thermoelectric properties.

关键词： Thermoelectrics Thin film Strategy Mechanism

High Temperature Thermoelectric Properties of Dy-doped CaMnO_3 Ceramics

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Journal of Materials Science & Technology 2014年第8期30卷 821-825页

作者： Bin Zhan Jinle Lan Yaochun Liu Yuanhua Lin Yang Shen cewen nan State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua University School of Materials Science and Engineering University of Science and Technology Beijing

Dy-doped CaMnO3 ceramics have been synthesized by co-precipitation method combined with the solid-state *** composition and microstructure analysis indicate that high density and pure CaMnO3 phase can be *** electric conductivity can be enhanced by Dy doping,and result in a slight increase of the thermal *** highest dimensionless figure of merit ZT of 0.15 has been obtained at 973 K for x = 0.02 sample,which is about 4 times larger than that of the pure CaMnO3,which indicate that CaMnO3can be a promising candidate for n-type thermoelectric material at high temperature.

关键词： CaMnO3 Thermoelectric properties Thermal conductivity