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Porous and non-porous alumina reinforced magnesium matrix composite through microwave and spark plasma sintering processes.

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Title: Porous and non-porous alumina reinforced magnesium matrix composite through microwave and spark plasma sintering processes.
Authors: Ghasali, Ehsan1 Ehsan_ghasali@yahoo.com, Alizadeh, Masoud1, Shirvanimoghaddam, Kamyar2 Kshirvan@deakin.edu.au, Mirzajany, Roghayeh1, Niazmand, Morteza1, Faeghi-Nia, Aida1, Ebadzadeh, Touradj1
Source: Materials Chemistry & Physics. Jun2018, Vol. 212, p252-259. 8p.
Subjects: Reinforced plastics, Magnesium compounds, Microwaves, Sintering, X-ray diffraction
Abstract: In this study, Alumina reinforced Magnesium Matrix Composites have been prepared by two different sintering method: microwave and spark plasma sintering (SPS) processes. 5 wt% alumina whisker was blended with magnesium powders in ethanol media for 10 min. The sintering temperatures in the spark plasma and microwave furnace were at 420° and 700 °C, respectively. Thermodynamic investigation and XRD results revealed the formation of MgO, Mg 2 Al 3 compounds in both sintered composites. However, microwave sintering led to form a porous composite (53.1% of theoretical density) while SPS resulted to formation of a fully dense composite. The mechanical examinations showed higher bending strength (163 ± 10 MPa) and micro-hardness (101 ± 11 Vickers) of SPS samples rather than microwave samples as it expected. By using two different sintering methods (pressure-less and pressure-assisted) and controlling processing parameters, the porosity of the final products can be changed from porous to fully dense composites. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:In this study, Alumina reinforced Magnesium Matrix Composites have been prepared by two different sintering method: microwave and spark plasma sintering (SPS) processes. 5 wt% alumina whisker was blended with magnesium powders in ethanol media for 10 min. The sintering temperatures in the spark plasma and microwave furnace were at 420° and 700 °C, respectively. Thermodynamic investigation and XRD results revealed the formation of MgO, Mg 2 Al 3 compounds in both sintered composites. However, microwave sintering led to form a porous composite (53.1% of theoretical density) while SPS resulted to formation of a fully dense composite. The mechanical examinations showed higher bending strength (163 ± 10 MPa) and micro-hardness (101 ± 11 Vickers) of SPS samples rather than microwave samples as it expected. By using two different sintering methods (pressure-less and pressure-assisted) and controlling processing parameters, the porosity of the final products can be changed from porous to fully dense composites. [ABSTRACT FROM AUTHOR]
ISSN:02540584
DOI:10.1016/j.matchemphys.2018.03.058