Abstract
ABSTRACTAlumina (Al2O3)-magnesium aluminate (MgAl2O4) composite was prepared from powders of magnesia (MgO) and Al2O3 by pressureless sintering. Phase compositions and properties of the Al2O3-MgAl2O4 composite were studied by adding different MgO contents as additive. Sintered products were subsequently characterized in terms of phase and microstructure analysis, densification study and compressive strength test. The results show that introduction of MgO is beneficial in forming MgAl2O4 reinforcement phase by solid state reaction between Al2O3 and MgO. Average particle size of Al2O3-MgAl2O4 composite decreases gradually with the increase of MgO content. Bulk density of the composite decreases from 2.48 to 2.40 g.cm–3 with the addition of MgO from 2 to 10 wt%, whereas compressive strength increases from 13 to 40 MPa. Reduction of particle size and the increase of MgAl2O4 bonding phase have resulted in increase of compressive strength of the Al2O3-MgAl2O4 composite.
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