Diphasic mullite gel pressed at 1.5 GPa : Mechanical properties and microstructure of ceramics

Mullite gels containing 72–85 wt% Al2O3 were prepared by mixing commercial boehmite and silica sols and gelled by heating. Powdered gels were either dried at 60°C or calcined at 550°C, and cold isostatically pressed under 0.5, 1.0 or 1.5 GPa. The effect of pressure is greater for the calcined gels t...

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Veröffentlicht in:Journal of materials science 1997, Vol.32 (12), p.3195-3199
Hauptverfasser: PACH, L, MANKOS, P
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MANKOS, P
description Mullite gels containing 72–85 wt% Al2O3 were prepared by mixing commercial boehmite and silica sols and gelled by heating. Powdered gels were either dried at 60°C or calcined at 550°C, and cold isostatically pressed under 0.5, 1.0 or 1.5 GPa. The effect of pressure is greater for the calcined gels than for the dried gels. The bulk density and room-temperature flexural strength of ceramics increased with increasing compacting pressure, while the fracture toughness is independent of the pressure. Mullite containing 75 wt% Al2O3 and sintered at 1500°C for 3 h has a density which is about 99% of the theoretical density, a flexural strength of 523±40 MPa and a fracture toughness of 3.5 MPa m1/2.
doi_str_mv 10.1023/A:1018606902702
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source SpringerNature Journals
subjects Aluminum oxide
Applied sciences
Boehmite
Building materials. Ceramics. Glasses
Bulk density
Ceramic industries
Ceramics
Chemical industry and chemicals
Cold isostatic pressing
Compacting
Exact sciences and technology
Flexural strength
Fracture toughness
Gels
Materials science
Mechanical properties
Miscellaneous
Mullite
Pressure effects
Roasting
Silica gel
Silicon dioxide
Sintering (powder metallurgy)
Technical ceramics
Theoretical density
title Diphasic mullite gel pressed at 1.5 GPa : Mechanical properties and microstructure of ceramics
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