Effect of porosity on hardness of Al2O3–Y3Al5O12 ceramic composite

Paneto, Flavio Jose; Pereira, Joaquim Lopes; Lima, J. O.; Jesus, Edwuin; Silva, L.A.; Lima, Eduardo Sousa; Cabral, Ricardo de Freitas; Santos, Claudinei dos

doi:10.1016/j.ijrmhm.2014.09.010

Cited by 59 publications

(29 citation statements)

References 14 publications

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“…Also, since TNZT is a β alloy, these values of activation energy can be correlated with the DSC curves where any endothermic peak due to the β-transition is not present. Therefore, the obtained results show the reliability and applicability of the proposed densification model, similarly to the previously reported studies [ 30 , 38 , 39 , 40 , 41 , 42 ]. The modeling results can be used for optimization of the processing of similar powders; they provide a basis for the finite-element analysis of the complex-shape parts′ SPS [ 28 , 29 , 43 , 44 ], predicting the evolution of density spatial distribution in the treated specimen’s volume.…”

Section: Resultssupporting

confidence: 89%

Fabrication of Titanium-Niobium-Zirconium-Tantalium Alloy (TNZT) Bioimplant Components with Controllable Porosity by Spark Plasma Sintering

et al. 2018

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Spark Plasma Sintering (SPS) is used to fabricate Titanium-Niobium-Zirconium-Tantalum alloy (TNZT) powder—based bioimplant components with controllable porosity. The developed densification maps show the effects of final SPS temperature, pressure, holding time, and initial particle size on final sample relative density. Correlations between the final sample density and mechanical properties of the fabricated TNZT components are also investigated and microstructural analysis of the processed material is conducted. A densification model is proposed and used to calculate the TNZT alloy creep activation energy. The obtained experimental data can be utilized for the optimized fabrication of TNZT components with specific microstructural and mechanical properties suitable for biomedical applications.

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Section: Resultssupporting

confidence: 89%

Fabrication of Titanium-Niobium-Zirconium-Tantalium Alloy (TNZT) Bioimplant Components with Controllable Porosity by Spark Plasma Sintering

et al. 2018

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“…44 reported the nanoharness of Al 4 W to be 9–11 GPa. The reason of PCPed n-80Al20W exhibits lower hardness than pure Al 4 W is attributed to the high porosity of the sample 45 . The calculated crystallite size of Al 4 W is 65.9 nm, calculated by Sherrer’s equation.…”

Section: Resultsmentioning

confidence: 99%

Aluminium matrix tungsten aluminide and tungsten reinforced composites by solid-state diffusion mechanism

Zhang

Feng

Akhtar

2017

Sci Rep

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In-situ processing of tungsten aluminide and tungsten reinforced aluminium matrix composites from elemental tungsten (W) and aluminium (Al) was investigated by thermal analysis and pulsed current processing (PCP). The formation mechanism of tungsten aluminides in 80 at.% Al-20 at.% W system was controlled by atomic diffusion. The particle size of W and Al in the starting powder mixture regulated the phase formation and microstructure. PCP of micron sized elemental Al and W resulted in formation of particulate reinforcements, W, Al4W and Al12W, dispersed in Al matrix. W particles were surrounded by a ~3 μm thick dual-layer structure of Al12W and Al4W. The hardness of Al matrix, containing Al12W reinforcements, was increased by 50% compared to pure Al, from 0.3 GPa to 0.45 GPa and W reinforcements showed a hardness of 4.35 GPa. On PCP of 80 at.% Al-20 at.% W mixture with particle size of W and Al ~70 nm, resulted in formation of Al4W as major phase along with small fractions of Al5W and unreacted W phase. This suggested strongly that the particle size of the starting elemental Al and W could be the controlling parameter in processing and tailoring of phase evolution, microstructure of particulate reinforced Al matrix composite.

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“…In the matrix grains of Al 2 O 3 phase, nanoparticles with sizes of 50–150 nm in the intragranular microstructures are present. Up to now, the traditional intragranular microstructures of Figure 6b for Al 2 O 3 /YAG are mainly reported [18,19]. The common sizes of the matrix grains for the traditional intragranular microstructures are micron.…”

Section: Resultsmentioning

confidence: 99%

Fabricating a Novel Intragranular Microstructure for Al2O3/GdAlO3 Ceramic Composites

Sun

2018

Materials

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In order to make the embryonic form of intragranular structure, the Al2O3/GdAlO3 system was selected due to its excellent mechanical properties. Gd2O3 and Al(NO3)3·9H2O were used as the starting materials. A co-precipitation method was used for the preparation of fine ceramics and applied to synthesize the nano-powder of GdAlO3 firstly. Then, the nano-powder of GdAlO3 was mixed with the precipitates by the second co-precipitation method. After drying and calcination, the compound powder with eutectic composition (77 mol % Al3+—23 mol % Gd3+) was fast sintered by using the spark plasma sintering technique. The results revealed that the phases of the sintered samples were Al2O3 and GdAlO3. The phases showed a homogeneous and interlaced distribution. All the matrix grains were submicron. The sizes of the intragranular structures were between 50 nm and 150 nm. Therefore, the intragranular structure displayed a novel mixture of nanometer–submicron and submicron–submicron types. The different intragranular structures all changed the fracture modes of Al2O3 grains from intergranular fracture to transgranular fracture.

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Effect of porosity on hardness of Al2O3–Y3Al5O12 ceramic composite

Cited by 59 publications

References 14 publications

Fabrication of Titanium-Niobium-Zirconium-Tantalium Alloy (TNZT) Bioimplant Components with Controllable Porosity by Spark Plasma Sintering

Fabrication of Titanium-Niobium-Zirconium-Tantalium Alloy (TNZT) Bioimplant Components with Controllable Porosity by Spark Plasma Sintering

Aluminium matrix tungsten aluminide and tungsten reinforced composites by solid-state diffusion mechanism

Fabricating a Novel Intragranular Microstructure for Al2O3/GdAlO3 Ceramic Composites

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