Transformation toughening in sol-gel-derived alumina-zirconia composites

Journal Article · Fri Aug 01 00:00:00 EDT 1997 · Journal of the American Ceramic Society

OSTI ID:532938

Srdic, V V; Radonjic, L ^[1]

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1. Univ. of Novi Sad (Yugoslavia). Dept. of Inorganic Technology and Materials Science

The microstructures of {alpha}-Al{sub 2}O{sub 3} seeded sol-gel-derived alumina-zirconia composites containing 20 wt% unstabilized zirconia (processed from zirconium n-propoxide) were very fine, with submicrometer alumina grains and small, mainly intergranular zirconia particles, the latter having a critical size for the tetragonal-to-monoclinic phase transformation of {approximately}0.45 {micro}m. The corresponding ratios of the toughening contribution to the matrix toughness are relatively low ({Delta}K{sub c}/K{sub 0} < 1). This finding is confirmed by an analysis of the tetragonal zirconia particle size dependence of the stress-induced transformation toughening.

• OSTI ID: 532938
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 8 Vol. 80; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
COMPOSITE MATERIALS
CRYSTAL-PHASE TRANSFORMATIONS
FRACTURE PROPERTIES
HARDNESS
MECHANICAL PROPERTIES
MICROSTRUCTURE
PARTICLE SIZE
SOL-GEL PROCESS
STRESSES
YOUNG MODULUS
ZIRCONIUM OXIDES