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2004 International Conference on Rare Earth ceramics and Glass

作者：张振宇李鸿琦张晋周红秀王丽娟张泰华 Department of Mechanics Tianjin UniversityTianjin 300072China Department of Mechanics Tianjin UniversityTianjin 300072China School of Material Science and Engineering Hebei University of TechnologyTianjin 300130China state key Lab of Engine Combustion Tianjin UniversityTianjin 300072China School of Material Science and Engineering Hebei University of TechnologyTianjin 300130China Institute of Mechanics Chinese Academy of SciencesBeijing 100080China

＜正＞ Fracture appearance, surface and nanomechanics properties of antibacterial ceramics containing rare earth phosphate composite antibacterial materials were characterized and measured by SEM, AFM and Nanoindenter, respectively. Results show that grain of fracture surface of antibacterial ceramics grows uniform refinement topography of bubble break-up appears at the surface, which is flat and has liquid character, by adding the phosphate composite containing rare earth, nevertheless needle-like crystal and granular outgrowth form at fracture surface and surface of common ceramics, respectively. Young’s modulus of antibacterial ceramic film is 74.397 GPa and hardness is 8. 134 GPa, which increses by 4.4% and 1.6% comparing with common ceramics, respectively. Loading curves of two kind of ceramics have obvious nonlinear character under 700 nm and linear character between 700-1000 nm, and unloading curve have obvious linear character.

关键词： AFM nanoindenter characterization nanomechanics antibacterial ceramic rare earths

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A review of CNTs and graphene reinforced YSZ nanocomposites:Preparation,mechanical and anti-irradiation properties

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Journal of Materials Science & Technology 2023年第36期167卷 27-49页

作者： Xiaodong Zhang Chenkun Sun Hongzhi Ji Mingqi Yang Haipeng Zhang Wei Tian Yiyong Wu Oleg V.Tolochko You Wang School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China No.703 Research Institute of China state Shipbuilding Company Limited Harbin 150078China Luoyang Bearing Science&Technology Co.Ltd. Luoyang 471039China AECC Sichuan Gas Turbine Establishment Chengdu 610500China Peter the Great Saint Petersburg Polytechnic University(SPbPU) Polytechicheskaya St.29Saint Petersburg 195251Russia

Yttria stabilized zirconia(YSZ)ceramics have been widely applied in areas of high-temperature thermal protection and nuclear radiation protection during the past *** carbon nanotubes(CNTs)and graphene are regarded as highly ideal reinforcements for YSZ ceramics due to their natural excellent ***,is still a controversial topic how to make YSZ composites obtain better performance after adding CNTs and *** particular,dispersion and sintering processes of CNTs and graphene in YSZ,are critical to the performance of the YSZ *** far,there is not a thorough analy-sis of the impact of CNTs and graphene on the mechanical characteristics and irradiation resistance of ***,this paper focuses on the dispersion methods and sintering technologies of CNTs/YSZ and graphene/YSZ nanocomposites,as well as the mechanical properties and anti-irradiation ***-thermore,the potential applications are also prospected for CNTs/YSZ and graphene/YSZ nanocomposites.

关键词： CNTs/YSZ Graphene/YSZ Dispersion methods Sintering technologies Mechanical properties Irradiation resistance

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Phase coexistence and evolution in sol-gel derived BY-PT-PZ ceramics with significantly enhanced piezoelectricity and high temperature stability

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Journal of Materiomics 2019年第3期5卷 394-403页

作者： Kai Cai Xue Yan Pingye Deng Li Jin Yang Bai Fei Zeng Dong Guo Beijing Center for Physical and Chemical Analysis Beijing100089China School of Materials Science and Engineering Beihang UniversityBeijing100191China Electronic Materials Research laboratory School of Electronic and Information EngineeringXi'an Jiaotong UniversityXi'an710049China School of Materials Science and Engineering University of Science and Technology BeijngBeijing100083China School of Material Science and Engineering Tsinghua UniversityBeijing100084China Institute of Acoustics Chinese Academy of SciencesBeijing100190China

In this study,high Curie Temperature(T_(c))perovskite ceramics of optimized composition 0.55(0.1BiYbO_(3)-0.9PbTiO_(3))-0.45PbZrO_(3) with unique double orthorhombic main phases were prepared by a modified solgel *** to the usual solid-state prepared sample,the sol-gel derived sample has a 1.6 times higher d_(33) of 325 pC/N,a 2.4 times higher remnant polarization,and a much better high temperature stability with similar depolarization temperature(T_(d))and T_(c).Comprehensive analysis of the xerogel prepared over a wide calcination temperature(T_(cal))range of 300-1000℃ revealed that perovskite structure appeared at only 400℃ and it became the main phase above 500℃.Comparison of XRD refinement results showed that calcination and sintering induced subtle and continuous phase transition,namely,the 400-900℃ calcined powders with coexisted tetragonal(P4mm)and orthorhombic(Pbam)phase changed to a rather stable double orthorhombic(Pmmm and Pbam)main phase in all the differently sintered ceramics,as similar to the 1000C calcined *** stable phase coexistence well explains the enhanced *** results also demonstrate that optimized sol-gel processing can provide high T_(c) ceramics with desirable multi-phase structure and significantly enhanced performance at a lower temperature.

关键词： Piezoelectricity Curie temperature Phase transition Sol-gel Perovskite

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Dielectric barrier discharge-based defect engineering method to assist flash sintering

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Journal of Advanced ceramics 2023年第5期12卷 1046-1057页

作者： Xinhao Zhao Nianping Yan Yueji Li Zikui Shen Rongxia Huang Chen Xu Xuetong Zhao Xilin Wang Ruobing Zhang Zhidong Jia Guangdong Engineering Technology Research Center of Power Equipment Reliability in Complicated Coastal Environments Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China state Grid Jiangxi Electric Power Research Institute Nanchang 330096China School of Electric Power Engineering South China University of TechnologyGuangzhou 510641China School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006China Institute of Materials China Academy of Engineering PhysicsMianyang 621907China fSchool of Electrical Engineering Chongqing UniversityChongqing 400044China

Oxygen vacancy OV plays an important role in a flash sintering (FS) process. In defect engineering, the methods of creating oxygen vacancy defects include doping, heating, and etching, and all of them often have complex processes or equipment. In this study, we used dielectric barrier discharge (DBD) as a new defect engineering technology to increase oxygen vacancy concentrations of green billets with different ceramics (ZnO, TiO_(2), and 3 mol% yttria-stabilized zirconia (3YSZ)). With an alternating current (AC) power supply of 10 kHz, low-temperature plasma was generated, and a specimen could be treated in different atmospheres. The effect of the DBD treatment was influenced by atmosphere, treatment time, and voltage amplitude of the power supply. After the DBD treatment, the oxygen vacancy defect concentration in ZnO samples increased significantly, and a resistance test showed that conductivity of the samples increased by 2–3 orders of magnitude. Moreover, the onset electric field (E) of ZnO FS decreased from 5.17 to 0.86 kV/cm at room temperature (RT);while in the whole FS, the max power dissipation decreased from 563.17 to 27.94 W. The defect concentration and conductivity of the green billets for TiO_(2) and 3YSZ were also changed by the DBD, and then the FS process was modified. It is a new technology to treat the green billet of ceramics in very short time, applicable to other ceramics, and beneficial to regulate the FS process.

关键词： flash sintering(FS) ZnO dielectric barrier discharge(DBD) oxygen vacancy OV defect engineering

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奥氏体析出相激发形核的原位TEM研究

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金属学报 2019年第4期55卷 511-520页

作者：杜娟程晓行杨天南陈龙庆 Mompiou Frédéric 张文征清华大学材料学院教育部先进材料重点实验室北京100084 Department of Materials Science and Engineering The Pennsylvania State University 清华大学材料学院新型陶瓷与精细工艺国家重点实验室北京100084 CEMES-CNRS and Université de Toulouse

利用原位透射电镜(TEM)观察双相不锈钢中奥氏体析出相变过程,发现了端-面连接的奥氏体激发形核现象。定量表征结果表明,激发形核奥氏体和先驱奥氏体与母相铁素体的位向关系都接近N-W,但属于不同的位向关系,且在不同的Bain环上。基于弹... 详细信息

利用原位透射电镜(TEM)观察双相不锈钢中奥氏体析出相变过程,发现了端-面连接的奥氏体激发形核现象。定量表征结果表明,激发形核奥氏体和先驱奥氏体与母相铁素体的位向关系都接近N-W,但属于不同的位向关系,且在不同的Bain环上。基于弹性相互作用能和界面能解释了激发形核奥氏体的择优晶体学取向,计算结果表明,先驱奥氏体与不同Bain环上激发形核奥氏体的弹性相互作用能为负值,且相邻奥氏体之间可以形成孪晶取向关系及共格孪晶界。

关键词：原位透射电镜激发形核奥氏体析出相弹性相互作用能

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