Alumina/Glass Composites Fabricated by Melt-Infiltration of Glass into Porous Alumina

Abstract:

Alumina/glass composites were successfully fabricated by melt-infiltration of glass into porous alumina pellets. Alumina powder was first pressed uniaxially at 100MPa to form disc-shaped pellets, then, heated up to 1200°C for 2 h to form porous pellets with moderate strength for subsequent infiltration. A mixture of calcium aluminosilicate and magnesium borosilicate glass powders were melt-infiltrated into porous alumina at 1200°C ~1250°C by capillary pressure to form composites. The infiltration depths varied with the square root of infiltration time. And the activation energy of the infiltration process was estimated to be 621 KJ/mole. After complete infiltration, the composite had bulk density approaching 3.3 g/cm3 (~ 96% of theoretical density) and open porosity reaching zero, with slight expansion of 0.5% in diameter. Its flexural strength was 150MPa and its Vickers microhardness was about 1000 Kg/mm2.

• Periodical: Key Engineering Materials (Volume 313)
• Pages: 129-138
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.313.129
• Online since: July 2006
• Authors: Yung Jen Lin, Li Bin Chang
• Keywords: Alumina Glass Composite, Aluminum (Al), Composite, Melt Infiltration

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