Eutectic Al 2 O 3 –GdAlO 3 composite consolidated by combined rapid quenching and spark plasma sintering technique

Abstract

A mixture of Al₂O₃ and GdAlO₃ was melted and rapid quenched to produce an amorphous film. Dense eutectic composites were consolidated from ground amorphous powder using both conventional and spark plasma sintering (SPS). Conventional sintering at temperatures above 1600°C for 24 h was required for complete sintering. However, using SPS complete sintering could be obtained at temperatures between 1300 and 1500°C with no soaking. The SPS technique could consolidate ultrafine eutectic structure from rapid quenched amorphous material, whilst conventional sintering was not successful owing to grain growth. A combination of rapid quenching and SPS resulted in an ultrafine eutectic Al₂O₃–GdAlO₃ structure.

Keywords

AMORPHOUS PHASE EUTECTIC STRUCTURE RAPID QUENCHING SPARK PLASMA SINTERING

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References

GALASSO

F. S.

: J. Met., 1967, 19, (6), 17–21.

STUBICAN

v. S.

and BRADT

R. C.

: Anna Rev. Mater. Sci., 1981, 11, 267–278.

WAKU

et al.: Nature, 1997, 389, 49–52.

YOSHIKAWA

et al.: J. Cryst. Growth, 2000, 218, 67–73.

YOSHIKAWA

et al.: J. Cryst. Growth, 1999, 205, 305–316.

OMORI

, ISOBE

and HIRAI

: J. Am. Ceram. Soc., 2000, 83, 2878–2880.