Effect of niobia as an additive in phosphate-bonded alumina

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...

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Bibliographic Details
Published in:Materials research bulletin 1996-02, Vol.31 (2), p.235-244
Main Authors: Fredericci, C., Folgueras-Dominguez, S.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Chemical industry and chemicals
Exact sciences and technology
Refractory products
Special refractories
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Summary: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.
ISSN:0025-5408
1873-4227
DOI:10.1016/0025-5408(95)00164-6