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Study of Thermodynamic Properties of Nonstoichiometric Phase with Compound Energy Model

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journal of Materials Science & Technology 2002年第5期18卷 422-426页

作者： ShuigenHUANG LinLI O.V.D.Biest j.vleugels PeilingWANG Sch. of Mat. Sci. and Eng. Shanghai Univ. Shanghai 200072 China Dept. MTM Katholieke Univ. Leuven B-3001 Heverlee Belgium Shanghai Inst. of Ceramics Chinese Acad. of Sci. Shanghai 200050 China

Using compound energy model (CEM), the thermodynamic properties of and were evaluated. The evaluation was based on the optimization of ZrIO2-CeO2 and ZrO2-CeO1.5 systems, as well as the miscibility gap in CeO1.5-CeO2 system. Except the cubic fluorite structure phase assessed with compound energy model, all the other solution phases were assessed with subsitutional solution model. The model parameters were evaluated through fitting the selected experimental data by means of thermodynamic optimization. A set of parameters with thermodynamics self-consistency was obtained and satisfactorily described the complex relation between y in and the partial pressure of oxygen at different temperatures, also the interdependence among miscellaneous factors such as temperature, oxygen partial pressure, the reduction amount of CeO2 as well as the nonstoichiometry in cubic phase - The calculated results seem to be reasonable when put into the explanation of pressureless sintering of Ce02-stabilized ZrO2 powder compacts at a controlled oxygen partial pressure.

关键词： Zirconia Ceria Nonstoichiometry Thermodynamic

Thermo dynamic Assessment and Microstructure of the ZrO2-CeO2-Al2O3 System

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journal of Materials Science & Technology 2004年第1期20卷 75-78页

作者： ShuigenHUANG LinLI j.vleugels O.V.D.Biest PeilingWANG SchoolofMaterialsScienceandEngineering ShanghaiUniversityShanghai200072China DepartmentofMTM KatholiekeUniversiteitLeuvenB-3001HeverleeBelgium StateKeyLaboratoryofHighPerformanceCeramicsandSuperfineMicrostructure ShangHaiInstituteofCeramicsChineseAcademyofSciencesShanghai200050China

The ZrO2-CeO2-AI2O3 system has been assessed with the CALPHAD (Calculation of Phase Diagrams) technique using the PARROT procedure. The experimental information on the ZrO2-AI2O3, AI2O3-CeO2 systems as well as the isothermal sections of the ternary system at 1673 K and 1873 K is well reproduced. According to the assessed isothermal section at 1723 K, no alumina dissolves into the tetragonal zirconia phase. Specimens with different alumina content are fabricated from commercial 12 mol pct CeO2-stabilized ZrO2 powder (12Ce-ZrO2). The thermodynamic properties are consistent with the observed microstructure, which present a combination of tetragonal phase and alumina grains.

关键词： Ce-TZP A12O3 Thermodynamics

Sintering of WC-Co powder with nanocrystalline WC by spark plasma sintering

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Rare Metals 2006年第3期25卷 246-252页

作者： WANG Xingqing XIE Yingfang GUO Hailiang O.Van der Biest j.vleugels School of Materials Science and Engineering Shanghai University Shanghai 200072 China Materials Engineering Faculty of Engineering Katholikeke Universiteit Leuven Leuven 3000 Belgium

A 92WC-8Co powder mixture with 33 nm WC grains was prepared by strengthening ball milling and was then sintered by spark plasma sintering （SPS） at 1000-1200℃ for 5-18 rain under 10-25 kN, respectively. Movement of the position of low punch shown shrinkage of the sintered body began above 800℃. The shrinkage slowly rose as the temperature rose from 800 to 1000℃ and then quickly rose at above 1000℃ and then gradually rose at above 1150℃. The densities of the samples increased with an increase in sintering temperature, rapidly below 1100℃, and then gradually above 1100℃. WC grains grow gradually with increasing sintering temperature. The powder was sintered to near full density at 1100℃ for 5 rain under 10 kN. The best result of the sample with 275 nm WC grains and no pores was obtained at 1150℃ under 10 kN for 5 rain. The research found the graphite die had a function of carburization, which could compensate the sintered body for the lack of carbon, and had the normal microstructure.

关键词： nanocrystalline cemented carbide spark plasma sintering low temperature sintering strengthening ball milling

Alumina/Ce-Tzp Functionally Graded Materials by Electrophoretic Deposition

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材料科学与工程学报 2000年第Z1期20卷 250-254页

作者： C.Zhao, j.vleugels Department of Metallurgy and Materials Engineering K. U. Leuven De Croylaan 2B-3001 Heverlee Belgium

Cylindrical Al2O3/Ce-TZP functionally graded composites were fabricated by electrophoretic deposition and pressureless sintering in air. A continuous change in composition was realized by changing the composition of the suspension during deposition. In order to achieve full densification, a temperature above 1550℃ was necessary. The resultant FGM cylinder with a diameter of 5.6 mm shows the following structure: a central hole with a diameter less than 0.5 mm, a tough Ce-ZrO2 core with a diameter of about 3 mm, a gradient layer of about 1 mm, and a hard Al2O3-rich surface layer. The Ce-ZrO2 core has a Vickers hardness between 10and 11 GPa and an excellent toughness (＞10 MPa√m). In the gradient layer, hardness and toughness vary continuously along the radius. The surface layer has a hardness of 15.5 GPa and a modest toughness of 2.5MPa√m.

关键词： Electrophoretic Deposition surface layer electrophoretic deposition Vickers hardness

Design of TRIP Steel With High Welding and Galvanizing Performance in Light of Thermodynamics and Kinetics

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journal of Iron and Steel Research International 2007年第6期14卷 37-41页

作者： LI Lin DE COOMAN B C LIU Ren-dong vleugels j ZHANG Mei SHI Wen School of Materials Shanghai University Shanghai 200072 China Postech Graduate School of Ferrous Technology Pohang University of Science and Technology Pohang 790784 South Korea Technique Center of Ansteel Ansteel Company Anshan 114001 Liaoning China Department of MTM Katholieke Universiteit Leuven Kasteelpark Arenberg 44 B-3001 Belgium

A new type of transformation induced plasticity （TRIP） steel with not only high strength and high ductility but also superior welding and galvanizing properties was designed and developed recently. Low carbon and low silicon content were preliminarily selected with the aim of meeting the requirements of superior quality in both welding and galvanizing. Phosphorus was chosen as one of the alloying elements, because it could reduce carbon activity in cementite and increase the stability of austenite. In addition, the possibility of phosphorus segregating at grain boundary was also discussed by thermodynamics as well as kinetics. Phase diagram was estimated at high temperature and the composition of the steel was then selected in the hyperperitectic range to avoid problems, which might occur in sheet steel continuous casting. Phase diagram in the *** temperature was estimated for the steel to obtain the starting temperature of fast cooling. For understanding the minimum rate of fast cooling, pearlite growth kinetics was calculated with self-developed diffusion coefficients of elements in grain boundary. Overaging temperature was determined through the calculation of To temperature by both equilibrium and para-equilibrium assumptions, which was different from the current determination, which is only based on an equilibrium estimation.

关键词： TRIP steel design thermodynamics kinetics weldability galvanization property

Computer-aided designing and manufacturing of advanced steels

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Rare Metals 2006年第5期25卷 407-411页

作者： LI Lin HE Yanlin B.C. De Cooman P. Wollants S. G. Huang j. vleugels Department of Materials Science and Engineering Shanghai University Shanghai 200072 China Laboratory for Iron and Steelmaking Universiteit Gent Zwijnaarde B-9052 Belgium Dept. MTM Katholieke Universiteit Leuven Leuven B-3001 Belgium

Suitable optimization and simulation were performed using a powerful software package with a mature database as well as modem measurement facilities, which led to the successful designing and manufacturing of advanced steels. In the course of designing, the composition of a large section of prehardened mold steel for plastics was estimated so as to lower the quantities of oxide inclusions to change the type of carbides and to raise the machinability. The composition and process were adjusted to obtain satisfactory surface quality for the prevailing galvanization in transformation-induced plasticity （TRIP） steel. The refuting process of low-carbon steel was simulated in the light of both Thermo-Calc and Factsage. Thermodynamic and kinetic analyses were always conducted during the test and the procedure.

关键词： material science advanced steel computer-aided design refining thermodynamics kinetics

Y_2O_3液相掺杂ZrO_2粉体的制备及其特性

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硅酸盐学报 2001年第5期29卷 488-491页

作者：袁正希 vleugels j Van Der Biest O 电子科技大学信息材料工程学院成都610054 DepartmentofMetallurgyandMaterialsEngineering

用一种新的液相掺杂技术制备Y2 O3 掺杂的ZrO2 纳米粉体 .在水 -乙醇溶剂中 ,干燥由硝酸铝、硝酸钇和单斜相氧化锆粉体组成的悬浮液 ,然后在 6 0 0℃热分解 ,可以制备出粒度小于 10 0nm的Y2 O3 掺杂单斜相ZrO2 粉体 .这种粉体可以在 0 .... 详细信息

用一种新的液相掺杂技术制备Y2 O3 掺杂的ZrO2 纳米粉体 .在水 -乙醇溶剂中 ,干燥由硝酸铝、硝酸钇和单斜相氧化锆粉体组成的悬浮液 ,然后在 6 0 0℃热分解 ,可以制备出粒度小于 10 0nm的Y2 O3 掺杂单斜相ZrO2 粉体 .这种粉体可以在 0 .1Pa的真空中 ,经 14 5 0℃热压烧结成致密化Y -TZP材料 .此材料的断裂韧性 (KⅠc)为 9.9MPa·m1 /2 ,Vickers硬度 (HV1 0 0N)为 11.72

关键词：制备氧化钇液相掺杂粉体钇稳定四方相多晶陶瓷力学性能二氧化锆 Y-TZP陶瓷原料

Wear modes in open porosity titanium matrix composites with TiC addition processed by spark plasma sintering

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Transactions of Nonferrous Metals Society of China 2019年第8期29卷 1653-1664页

作者： I. FARíAS L. OLMOS O. jIMéNEZ M. FLORES A. BRAEM j. vleugels Departamento de Ingeniería de Proyectos Universidad de Guadalajara 45100 Zapopan Jalisco México Instituto de Investigaciones en Ciencias de la Tierra - INICIT Universidad Michoacana de San Nicolás de Hidalgo 58060 Morelia Michoacán México KU Leuven Department of Materials Engineering Kasteelpark Arenberg 44 B-3001 Heverlee Belgium

This work focused on the influence of TiC reinforcing particles on the tribological properties of titanium matrix composites(TMCs)with open porosity,processed by spark plasma sintering(SPS).Materials composed of an equimolar mixture of Ti and TiH2 with 0,3,10 and 30 vol.% of TiC were sintered at 850 ℃.Nanoindentation and wear tests were carried out to assess the nanohardness and the wear resistance in a tribometer with a reciprocating sliding ball-on-flat *** showed a nanohardness increment from 5 to 14 GPa with increasing TiC *** coefficient of friction(CoF)showed a minimum of 0.2 for 10% TiC grade,which also showed the lowest wear *** the low TiC content sample,adhesive wear with severe plastic deformation was ***,medium content TiC sample showed a mechanical mixed layer(MML),whereas high TiC content composite showed abrasive as the main wear *** conclusion,the wear mechanisms,CoFs and wear volume changed with TiC content.

关键词： porous titanium spark plasma sintering wear titanium matrix composites

Study of Thermodynamic Properties of Nonstoichiometric Phase 1-zCezO2-x> with Compound Energy Model 附视频

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journal of Materials Science & Technology 2002年第5期 422-426页

作者： ShuigenHUANG ,LinLI ,O.V.D.Biest ,j.vleugels ,PeilingWANG

Using compound energy model (CEM), the thermodynamic properties ofandwere evaluated. The evaluation was based on the optimization of ZrO2-CeO2 and ZrO2-CeO1.5 systems, as well as the miscibility gap in CeO1.5-CeO2 system. Except the cubic fluorite structure phase assessed with compound energy model, all the other solution phases were assessed with subsitutional solution model. The model parameters were evaluated through fitting the selected experimental data by means of thermodynamic optimization. A set of parameters with thermodynamics self-consistency was obtained and satisfactorily described the complex relation between y inand the partial pressure of oxygen at different temperatures, also the interdependence among miscellaneous factors such as temperature, oxygen partial pressure, the reduction amount of CeO2 as well as the nonstoichiometry in cubic phase. The calculated results seem to be reasonable when put into the explanation of pressureless sint

关键词： Zirconia Ceria Nonstoichiometry Thermodynamic