ENHANCEMENT IN STRENGTH AND TOUGHNESS OF AL2O3 DUE TO DISSOLUTION OF CARBON

Authors
BHATTACHARYYA S AGRAWAL DC MEHROTRA US GUPTA SK
Citation
S. Bhattacharyya et al., ENHANCEMENT IN STRENGTH AND TOUGHNESS OF AL2O3 DUE TO DISSOLUTION OF CARBON, Bulletin of Materials Science, 20(5), 1997, pp. 685-691
Citations number
10
Categorie Soggetti
Material Science
Journal title
Bulletin of Materials Science → ACNP
ISSN journal
02504707
Volume
20
Issue
5
Year of publication
1997
Pages
685 - 691
Database
ISI
SICI code
0250-4707(1997)20:5<685:EISATO>2.0.ZU;2-U
Abstract
An improvement in fracture toughness and strength is observed in carbo n atmosphere sintered alumina on reheating the sintered samples in air at 1200 degrees C. SEM photographs show the presence of secondary pre cipitate particles at grain boundaries of the sintered samples, which disappear after reheating in air. Infrared spectroscopy indicates that the C-O bond intensity increases on reheating in air. An AES/XPS stud y reveals that carbon enters the alumina lattice on reheating. These r esults lead to the conclusion that the enhanced fracture toughness and strength are related to the dissolution of precipitates and consequen t dissolution of carbon in alumina lattice.