The Toughening of Alumina with Nickel Inclusions
Resource
Journal of the European Ceramic Society, v.6 n.1, p.31-37
Journal
Journal of the European Ceramic Society
Journal Volume
v.6 n.1
Pages
31-37
Date Issued
1990
Date
1990
Author(s)
Abstract
Brittle solids can be toughened by the introduction of ductile metallic inclusions. In the present study, the mechanical properties and oxidation resistance of Al2O3/Ni composites are investigated. The oxidation resistance of the ceramic/metal composite (8 × 10-11 g2 cm-4 s-1 at 1300° C) is comparable to that of many silicon nitrides. The fracture toughness of the composite containing 13 vol.% nickel is twice that of alumina alone. The square of the toughness enhancement for composites containing various amounts of nickel exhibits a linear relationship with the product of volume fraction and inclusion size, as predicted in theoretical models. For the alumina/nickel composite system, it is demonstrated that dissolved oxygen in the nickel increases the yield strength of nickel and enhances the toughness of the composite. © 1990.
Type
journal article