Sintering of heterogeneous ceramic compacts

Tuan, Wei‐Hsing; Brook, R. J.

doi:10.1007/bf02385405

Cited by 25 publications

(9 citation statements)

References 9 publications

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“…[11][12][13][14] High-aspect-ratio fibers and whiskers have been shown to retard liquid-phase sintering in ceramic-matrix composites because they limit the green density and inhibit rearrangement. Beyond this, the density drops, first for the carbon fibers and silicon carbide whiskers, then for the alumina particles, and finally for the cenospheres and silicon carbide particles.…”

Section: Discussionmentioning

confidence: 99%

Freeform fabrication of aluminum metal-matrix composites

et al. 2001

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A series of metal-matrix composites were formed by extrusion freeform fabrication of a sinterable aluminum alloy in combination with silicon carbide particles and whiskers, carbon fibers, alumina particles, and hollow flyash cenospheres. Silicon carbide particles were most successful in that the composites retained high density with up to 20 vol% of reinforcement and the strength approximately doubles over the strength of the metal matrix alone. Comparison with simple models suggests that this unexpectedly high degree of reinforcement can be attributed to the concentration of small silicon carbide particles around the larger metal powder. This fabrication method also allows composites to be formed with hollow spheres that cannot be formed by other powder or melt methods.

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Section: Discussionmentioning

confidence: 99%

Freeform fabrication of aluminum metal-matrix composites

et al. 2001

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“…[4][5][6] Besides, there are stresses arising from the presence of the heterogeneities and agglomerates give rise to differential sintering rates within the compact during sintering. 7,8 Thus, in most cases, these composite require hot-pressing or post-hot isostatic pressing for densification. It is well documented that the amorphous grain boundary phases play an important role in microstructural development during 1 Department of Information and Electronic Materials Engineering, College of Engineering, Paichai University, Daejeon, Republic of Korea 2 Amrita Center for Nanosciences, Nanosolar Division, Kochi, India sintering and also influence the properties of the sintered ceramics.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of pressure-less sintered zirconia–magnesium aluminum silicate glass composite

Sanosh

Kim

Balakrishnan

2011

Journal of Composite Materials

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The main objective of the present study was to develop a high-strength machinable ceramic based on zirconia (ZrO 2 ) and magnesium aluminum silicate (Mg 3 Al 2 Si 6 O 18 ; MAS) glass system through pressure-less sintering. Pressure-less sintering of ZrO 2 , 3 mol% yttria-stabilized (YSZ) was carried out at 1450 C in air, using 10 wt% MAS glass as a sintering additive. The influence of glass on the microstructure and mechanical properties of the composite was investigated. The presence of glass into the ZrO 2 matrix was substantiated using scanning electron microscopy (SEM). X-ray diffractometry (XRD) revealed no crystalline phases other than tetragonal ZrO 2 . The flexural strength of the composite was found to be~30% higher than YSZ. The apparent crack resistance was determined by Vickers microindentations carried out at different loads ranging from 9.8 to 196 N. The apparent crack length on the surface at each load was found to be decreased (6-21%) in YSZ and the corresponding crack-resistance values increased by about 5-20%. Both YSZ and composite showed rising trend in crack-resistance values as the indentation load was increased. Improved properties of composite sample were attributed to the formation of a relatively larger process zone surrounding the crack, crack-arrest behavior due to the localized compressive stresses, and the crack-bridging phenomena.

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“…The main factors that affect the sinterability of advanced ceramics include agglomerates 1-3 and inclusions. 4 An effective way to remove these inhomogeneities is the colloidal method, in which detrimental inhomogeneities can be removed using sedimentation and/or a selective flocculation method. 5,6 However, common forming methods from suspension or slurries such as slip casting, although studied theoretically 7,8 and used extensively, usually yield compacts that have relatively low green density, as compared with dry pressing.…”

Section: Introductionmentioning

confidence: 99%

Compaction and Sintering Behavior of Bimodal Alumina Powder Suspensions by Pressure Filtration

Shi

Zhang

2000

Journal of the American Ceramic Society

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The compaction behavior of fine alumina powders with different particle sizes or bimodal particle-size distributions that are undergoing pressure filtration was investigated. Three alumina powders-average particle sizes of 0.2-0.86 m-were compacted to a solids fraction of 62-65 vol% from suspensions at pH 3, which was the pH level at which the suspensions showed their lowest viscosity. When the powders of different average sizes were mixed, the suspensions showed better flowability, and the lowest viscosity was obtained when the fraction of fines was ϳ30 vol% and pH ‫؍‬ 3. The mixed-sized powder suspensions were compacted to higher density than the suspensions of unmixed fine or coarse powders, and the maximum density was obtained for mixed suspensions that had the lowest viscosity, despite the different particle-size ratio. Maximum densities of 72.5% and 75.0% were attained when the size ratios were 2 and 5, respectively. The compacts that were pressure-filtered from mixed suspensions exhibited a single-peaked pore-size distribution and a homogeneous microstructure, whereas the pore-size distributions of drypressed compacts were double-peaked. The sintering behavior of the compacts that were pressure-filtrated from bimodal powders exhibited significantly better sinterability and muchless linear shrinkage than the coarser powders and the drypressed powder compacts.

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Sintering of heterogeneous ceramic compacts

Cited by 25 publications

References 9 publications

Freeform fabrication of aluminum metal-matrix composites

Freeform fabrication of aluminum metal-matrix composites

Mechanical properties of pressure-less sintered zirconia–magnesium aluminum silicate glass composite

Compaction and Sintering Behavior of Bimodal Alumina Powder Suspensions by Pressure Filtration

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