Oxidation, densification and properties of extruded aluminium boehmite reaction-bonding mixtures

Kilbride, I.P.; Barker, Andrew

doi:10.1007/bf00349645

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2001

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“…The importance of the ␣-Al 2 O 3 formed from Al has been noted by Claussen et al 3,8 and Kilbride and Barker; 13 however, the effect of the initial ␣-Al 2 O 3 particles in the RBAO mixture on the ␥-Al 2 O 3 to ␣-Al 2 O 3 transformation has not been investigated. Messing et al showed that the ␥-Al 2 O 3 to ␣-Al 2 O 3 transformation can have a significant effect on subsequent sintering kinetics, temperature, and microstructure.…”

Section: Introductionmentioning

confidence: 97%

Seeding of the Reaction‐Bonded Aluminum Oxide Process

Suvacı¹,

Messing²

2001

Journal of the American Ceramic Society

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The effect of the initial ␣-Al 2 O 3 particle size in the reactionbonded aluminum oxide (RBAO) process on the phase transformation of aluminum-derived ␥-Al 2 O 3 to ␣-Al 2 O 3 , and subsequently densification, was investigated. It has been demonstrated that if the initial ␣-Al 2 O 3 particles are fine (ϳ0.2 m, i.e., 2.9 ؋ 10 14 ␥-Al 2 O 3 particles/cm 3 ), then they seed the phase transformation. The fine ␣-Al 2 O 3 decreases the transformation temperature to ϳ962°C and results in a finer microstructure. The smaller particle size of the seeded RBAO decreases the sintering temperature to as low as ϳ1135°C. The results confirm that seeding can be utilized to improve phase transformations and densification and subsequently to tailor final microstructures in RBAO-derived ceramics.

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Section: Introductionmentioning

confidence: 97%