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sintering kinetics involving grain growth and densification of Mg-PSZ nanopowders

Journal of Iron and Steel Research International 2022年第7期29卷 1138-1144页

作者： Yi-ming She Jie-fu Lang Di An Chao-wei Si Xu-dong Luo Zhi-peng Xie Jie-gang You School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051LiaoningChina Institute of Advanced Structures Beijing Institute of TechnologyBeijing 100081China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

sintering kinetics have been found to be effective in judging the evolution of *** using magnesium oxide-partially stabilized zirconia(Mg-PSZ)powder prepared by co-precipitation as raw materials,the evolution of densification and grain growth for Mg-PSZ ceramics were *** results indicated that the densification of samples was mainly controlled by grain boundary diffusion in intermediate sintering *** the sintering process,the grain growth mechanisms included normal grain growth,abnormal grain growth and solid solution drag-controlled grain ***,the apparent activation energy for grain growth of Mg-PSZ ceramics is lower than that of ZrO_(2)–Y_(2)O_(3)ceramics in the solid solution drag-controlled grain grow process,which will cause grain to grow *** sintering kinetics and microstructure of Mg-PSZ ceramics were studied,and the kinetic equation of grain growth at different temperatures was *** results show that the strength difference between Mg-PSZ and yttrium oxide-stabilized zirconia is closely related to the easy grain growth of Mg-PSZ ceramics.

关键词： Magnesium oxide-partially stabilized zirconia sintering kinetics Grain growth mechanism Densification mechanism Sizing nozzle

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sintering kinetics of Soft-Doped PZT(54/46)Systems

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Journal of Modern Physics 2011年第5期2卷 416-420页

作者： M.D.Durruthy-Rodriguez F.Calderon-Pinar C.Malfatti L.D.Perez-Fernandez Applied Physics Department CyberneticMathematic and Physics InstituteVedadoHavana CityHavanaCuba CINVESTAV-Unidad Queretaro IPNLibramiento Norponiente No.2000Fracc.Real de JuriquillaQuerétaroQuerétaroMéxico Magnetism Laboratory Science and Materials Technology InstitutesHavana UniversitySan Lázaro y LVedadoHavana CityCuba Metalurgy Deparment Engeneering SchoolRio Grande do Sul Federal UniversityPorto AlegreRS-Brasil Applied Physics Department CyberneticMathematic and Physics Institute VedadoHavana CityHavanaCuba

The influence of dopant concentration on PZT (54/46) systems doped with lanthanum and/or niobium is studied. The sintering kinetics is presented for 1 wt% of the dopant used to find the main mechanism which drives this process. The results were compared with a phenomenological model for viscous sintering and solid state sintering. The exponent obtained for viscous sintering in PZTN, PLZT and PLZTN were 0.05, 0.01, and 0.23 respectively, which indicate that the process is reactive liquid in all cases. In the other hand, the exponent obtained for solid state sintering were 6.61, 5.68, and 1.23 respectively, and prevalence Ost-wald ripening and coalescence process together. Both dopants inhibit the grain growth and accelerate the sintering process, which increases with dopant concentration and the combination of both dopants. Shoro-hod-Olevsky model was applied for explain grain growth evolution, but does not coincide strictly with the applied model, which suggest that the process is very complex.

关键词： sintering kinetics Porosity Dopant Concentration

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Microstructural evolution and sintering kinetics during spark plasma sintering of Fe and Al blended powder

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Transactions of Nonferrous Metals Society of China 2017年第7期27卷 1594-1601页

作者： Rui-di LI Tie-chui YUAN Xiao-jun LIU Ji-wei WANG Hong WU Fan-hao ZENG Xiang ZHOU State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China Shenzhen Institute of Information Technology Shenzhen 518172 China

The reaction diffusion between Fe and Al during spark plasma sintering(SPS)was *** evolution wasinvestigated by X-ray diffraction(XRD)and scanning electron microscopy(SEM)and the sintering kinetics was *** maininterphase of the SPS sample was ***-milling enabled a large number of lattice defects and grain boundariesthus the reaction kinetics was accelerated,although the direct current can also promote those *** milling,the phasetransformation kinetics was improved from0.207before mill to4.56×***,this work provided more details for thegeneration of Joule *** resistance offered to the electric path was considered to be the source of Joule heating,andparticularly the resistance offered by the different contact interfaces of die,punch,graphite foil and the sample played a leading rolefor the generation of Joule heating during spark plasma sintering.

关键词： Fe-Al blended powder spark plasma sintering sintering kinetics diffusion reaction Joule heating

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High performance of La-doped Y2O3 transparent ceramics

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Journal of Advanced Ceramics 2020年第4期9卷 493-502页

作者： Lei Zhang Jun Yang Hongyu Yu Wei Pan Shenzhen Institute of Wide-Bandgap Semiconductors and Engineering Research Center of Integrated Circuits for Next-Generation Communications of Ministry of Education School of MicroelectronicsSouthern University of Science and TechnologyShenzhen518055China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Department of General Education Army Engineering University of PLANanjing211101China

As an optical material,Y2O3 transparent ceramics are desirable for application as laser host ***,it is difficult to sinter and dense of Y2O3 hinders the preparation of high-quality optical ceramics via traditional *** this work,we use La2O3 as a sintering aid for fabricating high-transparency Y2O3 ceramics using a vacuum sintering *** is demonstrated that the in-line optical transmittance of 15.0 at%La-doped Y2O3 at a wavelength of 1100 nm achieves a transmittance of 81.2%.A sintering kinetics analysis reveals that a grain-boundary-diffusion-controlled mechanism dominates the faster densification at high La3+*** is also shown that both the mechanical and thermal properties of Y2O3 transparent ceramics are significantly improved upon the increase of La2O3 sintering *** results indicate that a La-doped Y2O3 transparent ceramic is a promising candidate for a laser host material.

关键词： Y2O3 transparent ceramics optical transmittance sintering kinetics mechanical properties thermal properties

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A Study on the Thermal Stability of La_2O_3-TiO_2 Supports

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Journal of Rare Earths 1991年第3期9卷 194-197页

作者：郑柏存汪仁 Research Institute of Catalysis East China University of Chemical TechnologyShanghai 200237China

In this paper,various techniques including BET,XRD,SEM and XPS were used to study the sintering of pure and La_2O_3-doped *** experimental results show that sintering of titania proceeds via volume diffu- *** of lanthanum oxide decreases the rate of sintering and hinders the phase transition from anatase to rutile crystal by strong surface interaction between the mixed crystals(La_4Ti_9O_(24),La_(0.66)TiO_(2.99))and TiO_2.

关键词： La_2O_3 TiO_2 sintering kinetics Thermal stability Anchoring effect

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