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L0065 - Effects of solid fission products forming dissolved oxide (Nd) and metallic precipitate (Ru) on the thermal conductivity of uranium base oxide fuel

The effects of solid fission products on the thermal conductivity of uranium base oxide nuclear fuel were experimentally investigated. Neodymium (Nd) and ruthenium (Ru) were added to represent the physical states of solid fission products such as 'dissolved oxide' and 'metallic precipitate', respectively. Thermal conductivity was determined on the basis of the thermal diffusivity, density and specific heat values. The effects of the additives on the thermal conductivity were quantified in the form of the thermal resistivity equation - the reciprocal of the phonon conduction equation - which was determined from the measured data. It is concluded that the thermal conductivity of the irradiated nuclear fuel is affected by both the 'dissolved oxide' and the 'metallic precipitate', however, the effects are in the opposite direction and the 'dissolved oxide' influences the thermal conductivity more significantly than that of the 'metallic precipitate'.


D-J. Kim, J-H. Yang, J-H. Kim, Y-W. Rhee, K-W. Kang, K-S. Kim, K-W. Song, Thermochimica Acta 455 (2007) 123-128

L0064 - Microwave synthesis and characterization of metastable (Al/Ti) and hybrid (Al/Ti + SiC) composites

Two-directional microwave assisted rapid sinteringwas carried out to fabricate Al/Ti metastable composites and Al/(Ti + SiC) hybrid composites. The length scale of Ti was in microns (20µm) and of SiC in nanometers (50 nm). Microstructural characterization revealed uniform distribution of Ti particulates and SiC nanoparticulates in the Al matrix, relatively low amount of porosity and good matrix-reinforcement interfacial integrity. Coefficient of thermal expansion of the Al matrix reduced due to the presence of Ti and Ti + SiC reinforcements. The results revealed that addition of SiC nanoparticulates to Al-Ti formulations assisted in increasing microhardness, macrohardness, Al-Ti interfacial hardness, 0.2% YS and UTS while the ductility was marginally affected. Particular emphasis was placed to study the feasibility of using hybrid reinforcements in the Al matrix synthesized by using microwaves.


S.K. Thakur, T.S. Kong, M. Gupta, Materials Science and Engineering A 452-453 (2007) 61-69

L0063 - Rheological behaviour of kaolin/talc/alumina suspensions for manufacturing cordierite foams

This paper deals with the preparation and rheological charaterization of concentrated suspensions (40 vol.% solids) of mixtures of kaolin/talc/alumina to relative weight contents of 40/43.8/16.2, respectively. These concentrated suspensions were thixotropic and viscosus, the rheological properties being largely influenced by a number of processing parameters, the most relevant being the nature and content of deflocculant and the pH value. Best results were obtained for a polyacrylic-based polyelectrolyte and pH 11. Green densities of 59 % of TD were obtained. Dynamic and static sintering studies were performed and the analysis of the resulting phases was made by XRD. From these tests it was concluded that cordierite phase needed a thermal treatment of 1300ºC to be formed. The sintered slip cast materials have a large residual porosity because of the coarse particle size of the raw materals. Macroporous cordierite foams are obtained by impregnation of polyurethane foam into the optimized slip and heating at 1350ºC/1h with a burning out step at 550ºC/30 min.


J.B. Rodrigues Neto, R. Moreno, Applied Clay Science 37 (2007) 157-166

L0062 - Modelling WC-Co sintering shrinkage - Effect of carbide grain size and cobalt content

Phenomenological models based on the constitutive parameters uniaxial viscosity, viscous equivalent of Poisson's ratio and sintering stress are used to describe WC-Co sintering shrinkage. Shrinkage is divided into three subsequent stages. The influences of carbide grain size and cobalt content are accounted for and model parameters numerically adjusted to dilatometer results. The model successfully represents published shrinkage data for different materials and milling procedures.


A. Petersson, J. Ågren, Materials Science and Engineering A 452-453 (2007) 37-45

L0061 - Wetting, densification and phase transformation of La2O3/A2O3/B2O3-based glass-ceramics

A lead-free, non-alkali La2O3-Al2O3-B2O3 (LAB) glass with Al2O3 filler had been investigated for low temperature co-firing ceramic (LTCC) application. The glass forming window and several physical properties of the LAB systems were investigated by ICP, TMA, XRD, DSC, and SEM/EDS. The results show that the densification and crystallization temperatures of LAB/Al2O3 were between 700°C and 950°C and depended greatly on the formulation. Crystalline phase LaBO3 (LB) and LaAl2B3O9 (L2A3B) crystallized starting at 825°C and 925°C, respectively. High degree of densification and crystallization of one glass-Al2O3 composition (L30A) was observed with the microstructure composed of tabular L2A3B grains interlocking with submicron Al2O3 and LB grains.


C-L. Chen, W-C.J. Wei, A. Roosen, Journal of the European Ceramic Society 26 (2006) 59-65

L0060 - Processing and characterization of ultra-thin yttria-stabilized zirconia (YSZ) electrolytic films for SOFC

Sub-micron yttria-stabilized zirconia (YSZ) electrolyte layer was prepared by a liquid state deposition method and with an average thickness of 0.5 Am to improve the performance of the anode-supported solid oxide fuel cell (SOFC). The YSZ precursors, containing yttrium and zirconium species and an additive, poly-vinyl-pyrrolidone (PVP), were spin-coated on a Ni/YSZ anode substrate. Several properties, including crystalline phases, microstructures, and current-voltage (I -V) characteristics, were investigated. The thin film of 4 mol% Y2O3-doped ZrO2 (4YSZ) consisted of cubic, tetragonal, and a trace of monoclinic phases, and showed a crack-free layer after sintering at 1300°C. The anode supported SOFC, which consists of the Ni-YSZ anode, 4YSZ electrolyte, and Pt/Pd cathode, showed power densities of 477 mW/cm2 at 600°C, and 684 mW/cm2 at 800°C. Otherwise, the surface cracks of the other YSZ-coated samples (e.g. 8YSZ) can be repaired by a multi-coating method.


Y-Y. Chen, W-C.J. Wei, Solid State Ionics 177 (2006) 351 - 357

L0059 - High-temperature thermal characterization

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G. Etherington, Ceramic Industry, feb 2007

L0058 - The current detour effect observed on materials with random microstucture: experimental evidence from Li3xLa2/3-xTiO3 studied by impedance spectroscopy

Impedance spectroscopy (IS) has been used to study the influence on the low frequency part of the impedance diagrams of the microstructure of a fast ionic conductor, Li3xLa2/3-xTiO3 with x = 0.10 (named hereafter LLTO). This oxide has been synthesised by sol-gel method. After synthesis, the powder of LLTO displays a large distribution of grain size and agglomerates. The grain size distribution and the porosity of the ceramic have been changed by heat-treatment from 600°C to 1200°C in air. The impedance spectra of these ceramics, recorded at different temperatures from room temperature (RT) to 400°C, show a low-frequency depressed arc, which is characteristic of the grain boundary response of the ceramic. Its shape depends strongly on the heat-treatment of the ceramic, and therefore, on its microstructure. It is a simple arc when the pellet is well sintered but becomes very complex for non-sintered ceramics with high resistive grain boundary and pores. The observed "fish" shape indicates the presence of current "detours effect" in the material. This effect means that current detours around blocking grain boundary and/or pores occur to lower the impedance. Consequently, the brick layer model (BLM), which assumes an ideal microstructure, and then no current "detours effect", can not be used to analyse these impedance data.


M. Vijayakumar, O. Bohnke, Journal of the European Ceramic Society 26 (2006) 3221-3231

L0057 - Deformation of steel powder compacts during sintering: Correlation between macroscopic measurement and in situ microtomography analysis

Powder compacts obtained by warm pressing of steel powder containing lubricant were found to swell during a typical delubrication cycle and shrink during sintering. The final dimensional changes of the denser compact were strongly anisotropic. Dilatometry measurements showed that final deformation resulted from microstructure induced by prior die pressing and from various phenomena arising at different stages of the cycle, each of them leading to a specific anisotropic effect. To corroborate this assumption the microstructure evolution of the denser material throughout sintering has been observed using in situ synchrotron X-ray computed microtomography. In addition to visual examination, quantitative analysis of 3D images consisted in searching for a relationship between the morphology and the orientation of pores in 2D sections and measuring local strain with an image correlation technique. From this information a schematic description of the main phenomena responsible for the deformation of steel powder compacts during sintering is proposed.


A. Vagnon, O. Lame, D. Bouvard, M. Di Michiel, D. Bellet, G. Kapelski, Acta Materialia 54 (2006) 513-522

L0056 - Piezo-spectroscopic characterization of alumina-aluminium titanate laminates

A multilayered alumina-aluminium titanate composite was prepared by a colloidal route from aqueous suspensions. The structure of the laminate was symmetric and constituted of two external Al2O3 layers (width=1750 µm), one central Al2O3 layer (width=1200 µm) and two intermediate thin (width=315-330 m) Al2O3-Al2TiO5 layers. Additional monolithic materials with the same compositions as those of the layers were fabricated as reference materials. Young's modulus of the monoliths was determined by three point bending. Dilatometry determinations were performed on green specimens, following the same heating and cooling schedules as those used for sintering the laminate, in order to determine the actual dimensional changes on cooling after sintering. The dimensional changes of the sintered specimens on heating and on cooling were also determined. Microscopic distributions of residual stresses were evaluated by fluorescence piezo-spectroscopy, and they revealed the existence of weak tensile and compressive hydrostatic stresses in the aluminium titanate and alumina layers, respectively. The level and sign of these stresses was in good agreement with those predicted based on analysis of the Young's modulus and the dimensional variations during cooling after sintering of the monoliths with the same compositions as those of the layers. Dimensional variations during cooling after sintering were different from those for sintered materials, which presented hysteresis between heating and cooling. In spite of the presence of compressive residual stresses in the external layers of the laminate, strength values of notched samples of the laminated specimens were lower than those for monoliths of the same composition as the external layers.


G. de Portu, S. Bueno, L. Micele, C. Baudin, G. Pezzotti, Journal of the European Ceramic Society 26 (2006) 2699-2705

L0055 - Ce4+ modified cordierite ceramics

A dense, low thermal expansion cordierite ceramic was prepared by the co-precipitation method and Ce4+ addition. Ce4+ addition can inhibit m-cordierite crystallization and improve a-cordierite crystallization. Adding 3.2 wt.% Ce4+ enables density and mechanical strength to reach maximum values with a minor increase in thermal expansion coefficient.


Z.M. Shi, X. Bai, X.F. Wang, Ceramics International 32 (2006) 723-726

L0054 - Electrical and thermal properties of La0.7Sr0.3Ga0.6Fe0.4O3 ceramics

Single-phase La0.7Sr0.3Ga0.6Fe0.4O3 (LSGF) ceramic powder was prepared in one step at 1500°C by solid-state reaction in air. The phase is a hexagonal (space group R-3c) at room temperature but becomes cubic at temperatures above 600°C. A high-density (97%) LSGF ceramic shows electrical conductivity of 4.3 S/cm (Ea = 0.32 eV) at 600°C in air. The thermal expansion coefficient of LSGF changes drastically in air due to oxygen loss and phase transition. High-density LSGF ceramic is relatively stable in forming gas (8% H2, 92% Ar). However, the powder decomposes in forming gas above 700°C with formation of LaSrGaO4. LSGF reacts with NiO at 1000°C. The ability of LSGF to split the C-H bond in methane at intermediate temperatures has been also evaluated.


S. Koutcheiko, P. Whitfield, I. Davidson, Ceramics International 32 (2006) 339-344

L0053 - Processing of Al2O3/Y-TZP laminates from water-based cast tapes

Laminated structures have been investigated due to their capability for the reinforcement of ceramics. Crack deflexion and bifurcation, surface strengthening and threshold strength are the mechanisms associated to the fracture of laminated ceramic. In all the cases, a precise control of the thickness and composition of the layers is necessary. In this sense, colloidal processing techniques have proved their adequacy for the fabrication of designed layered structures. This paper deals with the fabrication of layered ceramics by stacking water-based cast tapes at room temperature and using low pressures. In order to control the pressing procedure, the engineering strain-stress curves recorded during the stacking of the tapes were analyzed. Afterwards, the sintering conditions have been optimized by adjusting the green density of the tapes to avoid differential sintering and the associated cracks. Monolithic and layered materials free of cracks have been fabricated using optimized processing conditions.


A.J. Sanchez-Herencia, J. Gurauskis, C. Baudin, Composites: Part B 37 (2006) 499-508

L0052 - Effect of ceria on properties of yttrium-doped strontium titanate ceramics

This work reports the preparation and properties of the ceramic mixtures of the A-site deficient perovskite Sr0.94Y0.04TiO3 (SYT) with CeO2 in a range of ratios with a view to establishing their potential as anode materials for solid oxide fuel cells. Good electrical conductivity that decreased with increasing CeO2 content was observed on reduction in forming gas. The composition with 50 wt.% of CeO2 showed the conductivity of 7.0 S/cm at 900°C in forming gas. The thermal expansion of SYT-CeO2 ceramics in forming gas and in air were investigated in the range 25-900°C at a ramping rate of 3°C/min and thermal expansion coefficients were determined. The addition of ceria was found to have a positive influence on the catalytic behavior of SYT-CeO2 ceramics towards steam methane reforming.


S. Koutcheiko, Y. Yoo, A. Petric, Isobel Davidson, Ceramics International 32 (2006) 67-72

L0051 - Sintering and microstructure of rare earth phosphate ceramics REPO4 with RE = La, Ce or Y

Sintering of rare earth phosphates REPO4 (RE = La, Ce or Y) was studied using dilatometry. The presence of a secondary rare earth metaphosphate phase RE(PO3)3 as sintering aid was investigated. It proved to accelerate the densification but it activated fast grain growth, which was very detrimental to the microstructural design of processed ceramics. A temperature of 1400-1450°C was required to sinter pure LaPO4 and CePO4 ceramics with fine grains. Both compounds behave similar while YPO4 did not densify even at 1500°C. The influence of specific surface area of starting powders, temperature and holding time on the sintering rate and microstructures of dense REPO4 materials is also reported.


D. Bregiroux, S. Lucas, E. Champion, F. Audubert, D. Bernache-Assollant, Journal of the European Ceramic Society 26 (2006) 279-287

L0050 - Ba(Zn1/3Nb2/3)O3 sintering temperature lowering for silver co-sintering applications

The complex perovskite oxide Ba(Zn1/3Nb2/3)O3 have been broadly studied due to its attractive dielectric properties which place this material as a good candidate for manufacturing type I capacitors or hyperfrequency resonators. The development of Base Metal Electrodes Multi Layer Ceramic Capacitors (BME-MLCC) require a low sintering temperature to be co-sintered with a low cost metal such as copper or silver. Unfortunately, BZN requires a high temperature (1350°C according to the literature) to reach a satisfactory density (>90% of the theoretical one). The aim of this work is to lower the BZN sintering temperature to allow a co-sintering with copper or silver electrodes. For this goal, different sintering agents (lithium salts and glass phases) have been tested on the nominal compound. It is shown that an addition of 10 molar% B2O3 combined with 5 molar% LiF authorises a sintering temperature lowering near to 350°C. If a slight non-stoichiometry in A site is combined to these sintering agents, it is possible to reach a sintering temperature lower than 950°C without affecting the basic material properties. For each composition obtained, the ceramic is characterised in terms of final density, microstructure and dielectric properties. The silver co-sintering is also performed.


F. Roulland, S. Marinel, Ceramics International 32 (2006) 377-383

L0049 - Titanium effect on phase transformation and sintering behavior of transition alumina

The sintering behavior of doped gamma-alumina powders studied by dilatometry and electron microscopy is analysed with a particular emphasis on the role of titanium on the various densification steps. Compared with other doping elements, such as Mg, Y and Zr, which do not improve alpha-phase densification, titanium enhances this densification step by a fast decrease of internal colony porosity. This internal densification of single crystalline zones is attributed to the lengthening of the elementary bricks in titanium-doped samples.Atransient increase in densification rate is also observed, corresponding to the precipitation when during grain growth, grain boundaries become saturated with titanium. Final densities close to the theoretical values are obtained.


S. Lartigue-Korinek, C. Legros, C. Carry, F. Herbst, Journal of the European Ceramic Society 26 (2006) 2219-2230

L0048 - Effect of type of primary processing on the microstructure, CTE and mechanical properties of magnesium/alumina nanocomposites

Magnesium based composites containing 2.5wt.% of nano-sized Al2O3 (50nm) particulates reinforcement were synthesized using an innovative disintegrated melt deposition technique and blend-press-sinter powder metallurgy technique followed by hot extrusion. Microstructural characterization of the materials revealed uniform distribution of reinforcement, grain refinement and the presence of minimal porosity. Properties characterization revealed that the presence of nano-Al2O3 particulates led to an increase in dimensional stability, hardness, elastic modulus, 0.2% yield strength, UTS and ductility of pure magnesium. Amongst the composites, the ingot metallurgy processed material exhibited superior modulus and ductility while powder metallurgy processed material exhibited superior yield strength and ultimate tensile strength. The results further revealed that the overall combination of tensile properties of these materials remained superior when compared to high strength magnesium alloy AZ91 reinforced with much higher weight percentage of SiC. Fractography studies revealed that the typical brittle fracture of pure magnesium changed to ductile due to the incorporation of nano-Al2O3 particulates. An attempt is made in the present study to correlate the effect of nano-sized Al2O3 particulates as reinforcement and processing type with the microstructural and tensile properties of magnesium.


S.F. Hassan, M. Gupta, Composite Structures 72 (2006) 19-26

L0047 - Variation of the lattice parameter and thermal expansion coefficient of (U,Dy)O2 as a function of DyO1.5 content

Thermal expansions of (U,Dy)O2 solid solutions were investigated between room temperature and 1673K by using a thermo-mechanical analyzer. The lattice parameter of (U,Dy)O2 pellets is lower than that of UO2 and it decreases as Dy content increases. The linear thermal expansion and average thermal expansion coefficients of (U,Dy)O2 are higher than that of UO2. For the temperature range from room temperature to 1673 K, the average thermal expansion coefficient values for UO2 and (U0.8Dy0.2)O2 are 10.97x10^(-6) and 11.37x10^(-6) K-1, respectively.


S-H. Kim, H-S. Kim, Y-W Lee, D-S. Sohn, D-S. Suhr, Journal of Alloys and Compounds 407 (2006) 263-267

L0046 - Elaboration and characterisation of apatite based mineral supports for microfiltration and ultrafiltration membranes

The development and the characterisation of new supports for microfiltration and ultrafiltration membranes from apatite applied to filtration are presented. The choice of this material is based primarily on its low cost (considering its abundance in the Tunisian ores). The support, with tubular configuration, was prepared from natural apatite: apatite powders were crushed for 30 min and sieved to 200 mm. The resulting powders, mixed with organic additives and water, could be extruded to elaborate a porous structure. The firing temperature of the support is 1160°C. The morphologies of the surface and the cross-section observed on scanning electron microscope (SEM) are homogeneous and do not present any macro defects (cracks, etc.). The mean pore diameter, measured by mercury porosimetry, is 6 mm and the pore volume is 48%.


S. Masmoudi, A. Larbot, H. El Feki, R. Ben Amar, Ceramics International 33 (2007) 337-344


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