Mechanical Properties and Microstructure of Al2O3 Ceramics Superfast Densified by SPS

Journal of Inorganic Materials

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Mechanical Properties and Microstructure of Al₂O₃ Ceramics Superfast Densified by SPS

GAO Lian; HONG Jin-Sheng; MIYAMOTO Hiroki⁺, DIAZDELA TORRE Sebastian⁺

State Key Lab of High Performance Ceramics and Saperfine Microstructure; Shanghai Institute ofCeramics; Chinese Academy of Sciences Shanghai 200050 China; ⁺Technology Researeh Institute of Osaka Prefecture Osaka 594-1157 Japan

Received:1998-04-16 Revised:1998-05-12 Published:1998-12-20 Online:1998-12-20

Abstract

Abstract: Al₂O₃ ceramics were successfully superfast densified by spark plasma sintering (SPS) under the conditions of heating rate as high
as 600℃/min, no holding time at the sintering temperature from 1350 to 1700 ℃ and then fast cooling to 600℃ within 3 minutes. It showed that Al₂O₃ ceramics could reach to a
higher density at a lower sintering temperature by SPS, as compared with by normal pressureless sintering. The bending strength of pure Al₂O₃
ceramics superfast densified by SPS at the temperature range of 1400～1550℃ was as high as about 800 MPa, which is an excellent datum being of more
than a double of the bending strength for normal pure Al₂O₃ ceramics. SEM micrographs showed that the intragranular fracture was a preponderant
fracture mode in these Al₂O₃ ceramics being of very high bending strength.

Key words: superfast densification, spark plasma sintering, Al₂O₃ ceramics

CLC Number:

O539

GAO Lian,HONG Jin-Sheng,MIYAMOTO Hiroki,DIAZDELA TORRE Sebastian. Mechanical Properties and Microstructure of Al₂O₃ Ceramics Superfast Densified by SPS[J]. Journal of Inorganic Materials.

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Mechanical Properties and Microstructure of Al₂O₃ Ceramics Superfast Densified by SPS

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