Preparation of Al2O3 Ni composites by pressureless sintering in H2
Journal
Ceramics International
Journal Volume
21
Journal Issue
4
Pages
221-225
Date Issued
1995
Author(s)
Abstract
Brittle solids can be toughened by introducing ductile inclusions. In the present study, Al2O3 Ni composites are prepared by reducing Al2O3 and NiO powder mixtures or by reducing Al2O3 NiAl2O4 compacts in hydrogen. The flexural strength and fracture toughness of the Al2O3 Ni composites are determined. Due to the thermal expansion mismatch between alumina and nickel, a circumferential crack is formed at the interface as the nickel inclusion is larger than 2 μm. The toughness of the composites is enhanced by a crack bridging mechanism or by microcrack toughening. However, the strength of the Al2O3 Ni composites is decreased significantly as the microcracks are formed. © 1995.
SDGs
Type
journal article