| Effect of MgO on Phase Compositions and Properties
of Al2O3-MgAl2O4 Composite – A Prospective Man-Made
Ledge Material |
Jian-Hua Liu, Xiao-Jun Lv,* Jie Li, Chao Zhang, Yan-Qing Lai and Ye-Xiang Liu
pages : 108-111
DOI : 10.1080/0371750X.2016.1179130 |
| Abstract |
| Alumina (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.
[Keywords: MgO, Al2O3-MgAl2O4 composite, Bulk density, Compressive strength] |
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