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Journal of Materials Science

, Volume 27, Issue 6, pp 1464–1468 | Cite as

Sol-gel prepared Ni-alumina composite materials

Part I Microstructure and mechanical properties
  • E. Breval
  • Z. Deng
  • S. Chiou
  • C. G. Pantano
Papers

Abstract

The sol-gel method has been utilized for the preparation of dense, homogeneous ceramic-metal composites with up to 50% Ni in Al2O2. Examination by SEM and TEM shows that the materials consist of micrometre-size Al2O3 with metallic Ni in isolated regions from ∼50 μm down to nanometre size. The density ranges from ∼97% (10% Ni) to ∼74% (50% Ni) of the theoretical number. The hardness decreases from ∼18 GPa for pure alumina to ∼10 GPa for alumina containing 50% Ni. The fracture toughness increases significantly from K1c=3–4 MPa m1/2 to K1c=∼8.5 MPa m1/2. The elastic and shear moduli decrease from E=∼400 GPa and G=∼160 GPa for pure alumina to E=∼320 GPa and G=∼135 GPa when containing 50% Ni. The electrical resistivity is ∼106ωm with 10 to 40% Ni but decreases drastically at 50% Ni content.

Keywords

Polymer Alumina Al2O3 Composite Material Fracture Toughness 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • E. Breval
    • 1
  • Z. Deng
    • 2
  • S. Chiou
    • 3
  • C. G. Pantano
    • 2
  1. 1.Materials Research LaboratoryThe Pennsylvania State UniversityUniversity ParkUSA
  2. 2.Department of Materials Science and EngineeringThe Pennsylvania State UniversityUniversity ParkUSA
  3. 3.Department of Engineering Science and MechanicsThe Pennsylvania State UniversityUniversity ParkUSA

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