Abstract
In this work a study was carried out on the Al 2O 3/Nb 2O 5/H 3PO 4 system. A-2 alumina from Alcoa (Brazil) was used and the Al 2O 3/Nb 2O 5/H 3PO 4 system with an Al 2 O 3 P 2 O 5 molar ratio of 20.3, pressed at 20 and 60 MPa and thermally treated at 110, 300, 500, 800, 1000, 1200, 1400 and 1600 °C, was studied. An attempt was made to relate mechanical properties with porosity as well as with the phases formed during thermically treatment. X-ray diffraction (XRD), infrared spectroscopy (IRS) and magic-angle spinning phosphorus nuclear magnetic resonance ( 31P MAS NMR) were used for phase detection. The amorphous AlPO 4 was considered as the low temperature bonding phase. The system studied showed highest mechanical strength at 1400 °C.
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